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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549





FORM 10-K





(Mark One)

|x | Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
|- | ------------------------------------------------------------------------------------

For the fiscal year ended December 31, 2009

OR



| ̈ | Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
|- | ----------------------------------------------------------------------------------------

For the transition period from                  to

Commission File Number:
000-21699





VIROPHARMA INCORPORATED

(Exact name of registrant as specified in its charter)







|                                                               |  |                                     
|-------------------------------------------------------------- |  | ------------------------------------
|Delaware                                                       |  | 23-2789550                          
|(State or other jurisdiction of incorporation or organization) |  | (I.R.S. Employer Identification No.)
|                                                               | 
|730 Stockton Drive, Exton, Pennsylvania                        |  | 19341                               
|(Address of principal executive offices)                       |  | (Zip Code)                          

Registrants telephone number, including area code: 610-458-7300





Securities
registered pursuant to Section 12(b) of the Act:



|                               |  |                                           
|------------------------------ |  | ------------------------------------------
|Title of each class:           |  | Name of each exchange on which registered:
|Common Stock, par value $0.002 |  | The NASDAQ Stock Market LLC               

Securities registered pursuant to Section 12(g) of the Act:

Title of each class: None





Indicate by check mark if the registrant is a well-known seasoned issuer, as defined by Rule 405 of the Securities Act.    Yes  x    No   ̈

Indicate by check mark if the registrant is not
required to file reports pursuant to Section 13 or Section 15(d) of the Exchange Act.    Yes   ̈    No  x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed
by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports) and (2) has been subject to such filing requirements for the
past 90 days.    Yes  x    No   ̈

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required
to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such
files).    Yes   ̈    No   ̈

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrants knowledge, in
definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  x

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer. See definition of
accelerated filer and large accelerated filer in Rule 12b-2 of the Exchange Act. (Check one):



|                           |  |                      |  |                          |  |                             
|-------------------------- |  | -------------------- |  | ------------------------ |  | ----------------------------
|Large Accelerated Filer   ̈ |  | Accelerated Filer  x |  | Non-accelerated filer   ̈ |  | Smaller Reporting Company   ̈

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes   ̈    No  x

The
approximate aggregate market value of the voting stock held by non-affiliates of the registrant was approximately $401.7 million as of June 30, 2009, based upon the closing sale price per share of the Common Stock as quoted on the Global Market
segment of the NASDAQ Stock Market on that date.

The number of shares of the registrants Common Stock outstanding as of
February 19, 2010 was 77,480,094 shares.

DOCUMENTS INCORPORATED BY REFERENCE

As stated in Part III of this Annual Report on Form 10-K, portions of the registrants definitive proxy statement for the registrants 2009 Annual
Meeting of Stockholders scheduled to be held on May 24, 2010 are incorporated by reference in Part III of this Annual Report on Form 10-K.









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VIROPHARMA INCORPORATED

FORM 10-K ANNUAL REPORT

For Fiscal Year Ended
December 31, 2009

TABLE OF CONTENTS



|                                            |  |                                                                                                              |  |     
|------------------------------------------- |  | ------------------------------------------------------------------------------------------------------------ |  | ----
|                                            |  |                                                                                                              |  | Page
|PART I                                      |  |                                                                                                             
|Item 1.                                     |  | Business                                                                                                     |  | 1   
|Item 1A.                                    |  | Risk Factors                                                                                                 |  | 25  
|Item 1B.                                    |  | Unresolved Staff Comments                                                                                    |  | 48  
|Item 2.                                     |  | Properties                                                                                                   |  | 48  
|Item 3.                                     |  | Legal Proceedings                                                                                            |  | 49  
|Item 4.                                     |  | Submission of Matters to a Vote of Security Holders                                                          |  | 49  
|PART II                                     |  |                                                                                                             
|Item 5.                                     |  | Market for Registrants Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities |  | 50  
|Item 6.                                     |  | Selected Financial Data                                                                                      |  | 51  
|Item 7.                                     |  | Managements Discussion and Analysis of Financial Condition and Results of
Operation                         |  | 53  
|Item 7A.                                    |  | Quantitative and Qualitative Disclosures about Market Risk                                                   |  | 73  
|Item 8.                                     |  | Financial Statements and Supplementary Data                                                                  |  | 74  
|Item 9.                                     |  | Changes in and Disagreements with Accountants on Accounting and Financial
Disclosure                         |  | 74  
|Item 9A.                                    |  | Controls and Procedures                                                                                      |  | 75  
|Item 9B.                                    |  | Other Information                                                                                            |  | 78  
|PART III                                    |  |                                                                                                             
|Item 10.                                    |  | Directors, Executive Officers and Corporate Governance                                                       |  | 78  
|Item 11.                                    |  | Executive Compensation                                                                                       |  | 78  
|Item 12.                                    |  | Security ownership of certain beneficial owners and management and related stockholder
matter                |  | 78  
|Item 13.                                    |  | Certain Relationships and Related Transactions, and Director Independence                                    |  | 78  
|Item 14.                                    |  | Principal Accounting Fees and Services                                                                       |  | 78  
|PART IV                                     |  |                                                                                                             
|Item 15.                                    |  | Exhibits and Financial Statement Schedules                                                                   |  | 79  
|Signatures                                  |  | 84                                                                                                          
|                                            | 
|Index to Financial Statements and Schedules |  | 85                                                                                                          

ViroPharma,
ViroPharma plus the design, Cinryze, CinryzeSolutions and Vancocin are trademarks and service marks of ViroPharma or its licensors. We have obtained trademark registration in the United States for the marks in
connection with certain products and services. All other brand names or trademarks appearing in this Annual Report on Form 10-K are the property of others.

Unless the context requires otherwise, references in this report to we, our, us, Company and ViroPharma refer to ViroPharma Incorporated and
its subsidiaries.



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PART I



|ITEM 1. | BUSINESS
|------- | --------

ViroPharma
Incorporated and subsidiaries is a global biotechnology company dedicated to the development and commercialization of products that address serious diseases, with a focus on products used by physician specialists or in hospital settings. We have two
marketed products and two development programs. We intend to grow through sales of our marketed products, CinryzeTMand Vancocin®, through continued development of our
product pipeline, expansion of sales of Cinryze into additional territories and through potential acquisition or licensing of products or acquisition of companies.

We market and sell Cinryze in the United States for routine prophylaxis against angioedema attacks in adolescent and adult patients with hereditary angioedema (HAE). Cinryze is a C1 esterase inhibitor
therapy for routine prophylaxis against HAE, also known as C1 inhibitor (C1-INH) deficiency, a rare, severely debilitating, life-threatening genetic disorder. Cinryze was obtained in October 2008, when we completed our acquisition of Lev
Pharmaceuticals, Inc. (Lev). On January 8, 2010 we obtained expanded rights to commercialize Cinryze and future C1-INH derived products in certain European countries and other territories throughout the world (as described in the strategic
relationships section) as well as rights to develop future C1-INH derived products for additional indications. We intend to seek to commercialize Cinryze in Europe in 2011 in countries which we have distribution rights. We are currently evaluating
our commercialization plans in additional territories. We also intend to conduct studies to identify further therapeutic uses and expand the labeled indication for Cinryze to potentially include other C1 mediated diseases as well as new modes of
administration.

We also market and sell Vancocin HCl capsules, the oral capsule formulation of vancomycin hydrochloride, in the U.S. and its
territories. Vancocin is a potent antibiotic approved by the U.S. Food and Drug Administration, or FDA, to treat antibiotic-associated pseudomembranous colitis caused by Clostridium difficileinfection (CDI), or C. difficile, and
enterocolitis caused by Staphylococcus aureus, including methicillin-resistant strains.

We currently have two development programs, C1
esterase inhibitor [human] to identify further therapeutic uses and potential additional indications and other modes of administration for the treatment of HAE and other C1 mediated diseases and a non-toxigenic strain of C. difficile (NTCD) for the
treatment and prevention of CDI. On August 6, 2009 we announced that dosing has begun in the Phase 1 clinical trial for NTCD. The Phase 1 study will determine the safety and tolerability of NTCD dosed orally as a single and repeat escalating
doses in healthy young and older adults. On February 9, 2009, we announced that our Phase 3 trial evaluating maribavir used as prophylaxis in allogeneic stem cell, or bone marrow, transplant (SCT) patients did not achieve its primary endpoint.
In the primary analysis, there was no statistically significant difference between maribavir and placebo in reducing the rate of CMV disease. Additionally, on February 13, 2009, we announced that enrollment in our Phase 3 trial evaluating
maribavir in liver transplant patients was discontinued and that all patients on study drug were moved to the current standard of care. We continue to evaluate our maribavir program in light of the Phase 3 clinical trial results.

We licensed the U.S. and Canadian rights for a further product development candidate, an intranasal formulation of pleconaril, to Merck & Co., Inc.
(Merck) for the treatment of picornavirus infections.

We intend to continue to evaluate in-licensing or other opportunities to acquire
products in development, or those that are currently on the market. We plan to seek products that treat serious or life threatening illnesses, which treat high unmet medical needs, which require limited commercial infrastructure, and that have the
potential to provide both top and bottom line growth.

We were incorporated in Delaware in September 1994 and commenced operations in December
1994. Our executive offices are located at 730 Stockton Drive, Exton, Pennsylvania 19341, our telephone number is 610-458-7300 and our website address is www.viropharma.com. Information contained on our website is not incorporated into this Annual
Report on Form 10-K or any other filings we make with the SEC.



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The following chart generally describes our approved products:



|                                                                      |  |                            |  |                                         |  |                          |  |                  
|--------------------------------------------------------------------- |  | -------------------------- |  | --------------------------------------- |  | ------------------------ |  | -----------------
|Product                                                               |  | Marketplace                |  | Disease                                 |  | Program Indication       |  | Product Status   
|Cinryze  IV                                                          |  | US                         |  | HAE                                     |  | Prophylaxis              |  | Marketed         
|                                                                      |  |                            |  |                                        
|Vancocin                                                              |  | US                         |  | CDI                                     |  | Treatment                |  | Marketed         
|                                                                     
|The following chart generally describes our investigational products:
|                                                                      |  |                            |  |                                        
|Product                                                               |  | Marketplace                |  | Disease                                 |  | Proposed Indication      |  | Product Status   
|C1 esterase inhibitor [human]  IV                                    |  | EU                         |  | HAE                                     |  | Prophylaxis and acute    |  | Prefiling        
|                                                                      |  |                            |  |                                        
|C1 esterase inhibitor [human]  IV                                    |  | ROW*                       |  | HAE                                     |  | Prophylaxis and acute    |  | Prefiling        
|                                                                      |  |                            |  |                                        
|Non-toxigenic strain of C.difficile (NTCD)                            |  | Worldwide                  |  | CDI                                     |  | Treatment and prevention |  | Phase 1          
|                                                                      |  |                            |  |                                        
|C1 esterase inhibitor [human] subcutaneous administration            |  | Worldwide                  |  | HAE                                     |  | Prophylaxis              |  | Phase 1          
|                                                                      |  |                            | 
|C1 esterase inhibitor [human]  IV                                    |  | Worldwide                  |  | Additional indications under evaluation |  | Preclincial             
|                                                                      |  |                            |  |                                        
|Maribavir                                                             |  | Worldwide,other than Japan |  | CMV                                     |  | Treatment and prevention |  | EvaluatingProgram



|* | ROW is defined in the Strategic Relationships section of the document.
|- | ----------------------------------------------------------------------

Marketed Products

Cinryze

The FDA granted approval for Cinryze in October 2008 for routine prophylaxis against attacks in adolescent and adult patients with hereditary angioedema
(HAE). HAE is a genetic disorder characterized by episodes of edema (swelling) in the extremities, face, abdomen, and airway passages. The majority of patients have episodes of severe abdominal pain, nausea and vomiting that is caused by swelling in
the intestinal wall. Attacks that involve the face and throat must be taken seriously and medical treatment should be sought without delay. Swelling of the throat can close the air passage and cause death by suffocation. The mortality rate from
untreated airway obstruction has been reported to be over 40% with death most frequently caused by asphyxiation due to airway closure. The course of the disease is diverse and unpredictable, even within a single patient over his or her lifetime.
Swelling caused by HAE usually lasts for 24-72 hours, but the length of an attack can range from four hours to four days. On average, patients experience approximately one attack per month, but the frequency is highly variable. As many as 5% to 10%
of patients are severely affected, experiencing attacks one to three times per week. HAE affects between 1 in 10,000 and 1 in 50,000 individuals worldwide and there are believed to be as many as 11,000 people with HAE in the United States.

HAE is caused by a defective gene for C1 inhibitor (C1-INH), and this defect is passed on in families, such thata child has a 50%
chance of inheriting this disease if one parent is affected. The absence of family history, however, does not rule out HAE diagnosis, and as many as 20% of HAE cases involve patients who appear to have had a spontaneous mutation of the C1-INH gene.
This genetic defect results in the production of either inadequate levels or poorly functioning C1-INH protein.

C1-INH is a normal
constituent of human blood and primarily regulates activation of key inflammatory and coagulation biochemical pathways, specifically the contact and complement pathways in addition to the fibrinolytic system. Regulation of these systems is
performed through the formation of complexes between pathway proteinase enzyme and C1-INH, resulting in inactivation of both and consumption of C1-INH. HAE patients have low levels of endogenous or functional C1-INH. Although the events that
induce angioedema



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attacks in HAE patients are not well defined, it is thought that increased blood vessel permeability leading to swelling and the clinical manifestations of HAE attacks are mediated
primarily through contact system activation. Administration of Cinryze increases plasma levels of C1-INH activity. Increased levels of functional C1-INH are thought to suppress contact system activation through the inactivation of plasma
kallikrein and factor XIIa, preventing the generation of bradykinin, a natural peptide thought to be responsible for modulation of blood vessel permeability.

Because HAE is rare and has a wide variability in disease expression, it is not uncommon for patients to remain undiagnosed or misdiagnosed for many years. Many patients report that their frequent and
severe abdominal pain was inappropriately diagnosed as psychosomatic. Although rare, HAE is a disease with potentially catastrophic consequences for those affected. Aside from the potentially fatal acute respiratory compromise, unnecessary
exploratory surgery has been performed on patients experiencing gastrointestinal edema because abdominal HAE attacks mimic conditions requiring surgery.

Traditionally, HAE has been classified into two types (I and II). The most common form of the disease, Type I, is characterized by low levels of C1-INH and affects about 85% of patients, whereas Type II
HAE affects 15% of patients and is characterized by poorly functioning C1-INH. A third type of HAE has been identified in which the abnormal C1-INH protein binds to albumin, effectively reducing the amount of functional C1-INH.

Current Treatments of HAE

Treatment of HAE can be categorized as: (i) mitigation or acute treatments to remedy the symptoms of infrequent episodic acute attacks; and (ii) preventive or prophylactic treatments for patients severely affected by HAE.

Current therapies primarily focus upon treating the symptoms of an acute attack. Two therapeutic agents that can be used for treatment of
acute attacks were approved by the FDA in 2009, a kallikrein inhibitor and a C1-INH. For swelling of the intestinal wall, which can cause debilitating pain, narcotics such as morphine and antiemetics for nausea are often given. For severe laryngeal
swelling, which can be life threatening, rescue therapy such as intubation or tracheotomy may be required. The use of fresh frozen plasma, which contains C1-INH but which also contains a wide variety of other factors that may activate multiple
inflammatory pathways and exacerbate an attack, is also used in some instances.

Cinryze is the only FDA approved product for prevention of
HAE attacks. Prior to the approval of Cinryze, patients who experience more than one attack per month have historically been treated with anabolic steroids that reduce the frequency of attacks of edema. The most commonly used steroids are
alpha-alkylated androgens. Use of such anabolic steroids can have numerous side effects ranging from hepatotoxicity (liver toxicity), virilization (development of male sexual characteristics in a female), weight gain, acne and hirsutism (unwanted
hair growth).

The FDA granted Cinryze seven years of marketing exclusivity for routine prophylaxis of HAE upon FDA approval pursuant to the
Orphan Drug Act. The Office of Orphan Products Development originally granted orphan drug designation for Cinryze on July 16, 2004. We are currently conducting a phase 4 study to evaluate the safety and effect of escalating doses of Cinryze as
prophylactic therapy which was a post approval requirement of the FDA.

Vancocin

In November 2004, we acquired all rights in the U.S. and its territories to manufacture, market and sell Vancocin, as well as rights to certain related
vancomycin products, from Eli Lilly and Company (Lilly). Lilly retained its rights to Vancocin outside of the U.S. and its territories. Vancocin is approved by the FDA for treatment of enterocolitis caused by S. aureus (including
methicillin-resistant strains) and antibiotic associated



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pseudomembranous colitis caused by C. difficile. Both are potentially serious infections of the gastrointestinal (GI) tract. S. aureus enterocolitis is rare; accordingly, infection
with C. difficileis the indication that accounts for the majority of Vancocins use.

CDI is an infection of the GI tract. The
clinical manifestations, ranging from diarrhea to toxicmegacolon and sometimes death, are a result of toxins produced by the bacterium that cause inflammation in the colon. Hospitalized patients, those residing in long-term care centers, those
greater than 65 years of age, and patients that have received broad-spectrum antibiotic therapy, are at greatest risk to acquire CDI.

CDI is
not a nationally reportable disease and as such it is difficult to estimate the actual incidence of disease with precision. Based on reports from the Centers for Disease Control and Prevention (CDC) and peer-reviewed publications, we estimate that
at least 500,000 patients were affected by CDI in 2008. In recent years, many clinicians reported treating increasing numbers of patients with severe CDI and increased mortality rates. Clinicians have also noted that some patients are progressing
from mild/moderate disease to severe disease or death more rapidly than previously observed. The overall incidence of CDI may have plateaued or even decreased in 2009 relative to 2008, however reliable data on current incidence are limited.

Although the causes for this change in CDI remain under active investigation, the CDC has postulated that a combination of changes in
antibiotic use and infection control practices, along with the emergence of a hypervirulent strain of C. difficile, are likely contributors. As of late 2008, this strain (referred to as the toxinotype III, BI, or NAP1/027 strain) has been
identified in at least 40 states in the U.S.

Vancocin is the only drug approved by the FDA for the treatment of antibiotic-associated
pseudomembranous colitis caused by C. difficile. Historically metronidazole has been commonly used as first-line treatment for CDI, while Vancocin has been reserved for those patients who have failed metronidazole, have recurrent disease, or
who are suffering from severe CDI. We believe that changes in the epidemiology of CDI, in particular the increasing frequency of severe disease, and data suggesting that failure or relapse occur more commonly in patients treated with metronidazole
have led to an increase in the use of Vancocin.

In December 2008, FDA changed OGDs 2006 bioequivalence recommendation, which we have
opposed since its original proposal in March 2006, by issuing draft guidance for establishing bioequivalence to Vancocin which would require generic products that have the same inactive ingredients in the same quantities as Vancocin (Q1 and Q2
the same) to demonstrate bioequivalence through comparative in vitro dissolution testing. Under this latest proposed method, any generic product that is not Q1 and Q2 the same as Vancocin would need to conduct an in vivo study with
clinical endpoints to demonstrate bioequivalence with Vancocin. On August 4, 2009 the FDAs Pharmaceutical Science and Clinical Pharmacology Advisory Committee voted in favor of the portion of the OGDs 2008 draft guidelines on
bioequivalence for Vancocin that restricts in vitro bioequivalence testing for generic products that are, among other things, Q1 and Q2 the same as Vancocin.

Product Pipeline

We currently have two development programs. Our C1 esterase
inhibitor [human] related development program focuses on our efforts to commercialize Cinryze in Europe and certain other countries, conduct clinical studies to identify additional therapeutic uses to expand the labeled indication for C1 esterase
inhibitors to potentially include other C1 mediated diseases as well as new modes of administration of C1 esterase inhibitors. We are also conducting Phase 1 clinical studies targeting the treatment and prevention of CDI utilizing the spore form of
a non-toxin producing strain of C. difficile (NTCD). We continue to evaluate our maribavir program in light of the Phase 3 clinical trial results.

In addition, we have licensed intranasal pleconaril to Merck who has assumed responsibility for all development and commercialization of pleconaril in the U.S. and Canada.



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HAE Program

Cinryze IVEU and ROW

In January 2010, we obtained expanded rights to commercialize Cinryze in certain countries in Europe and ROW as well as rights to develop future C1-INH derived products for additional indications. We intend to commercialize Cinryze in
Europe when the product has received the EMA commission approval which we anticipate during 2011. HAE affects between 1 in 30,000 and 1 in 50,000 individuals in Europe. We are seeking approval to market Cinryze IV to patients in Europe for the
treatment and routine prophylaxis against attacks in adolescent and adult patients with HAE. Part of this commercialization plan was obtaining Orphan Drug designation for Europe which was granted in October 2009.

C1-INH concentrate has been marketed to HAE patients for acute treatment in Europe for 25 years. Our ability to compete in this marketplace is contingent
upon our success in differentiating Cinryze IV over existing CI-INH products.

We are currently in the early stages of identifying the steps
necessary to launch in territories outside of the US and EU.

Cinryze IVOther C1 mediated diseases and
Cinryzeother formulations

We are currently evaluating with our partner Sanquin, the feasibility of additional therapeutic uses and
potential indications in addition to other formulations and modes of administration for Cinryze. We have conducted a Phase 1 study utilizing subcutaneous administration and expect to commence a Phase 2 study in 2010. We also intend to conduct
studies to identify further therapeutic uses and additional potential indications for other C1 mediated diseases. Our initial focus includes investigating C1-INH in transplant patients. Finally, we are currently evaluating a recombinant C1-INH
technology which may be incorporated in the treatment of C1 mediated diseases.

CDI Program

NTCD

In February 2006, we
announced that we had entered into a licensing agreement with Dr. Dale Gerding, of the Hines VA, for the rights to develop non-toxigenic strains of C. difficile(NTCD) for the treatment and prevention of CDI. We plan to initially focus
our efforts on the opportunity to prevent recurrence of CDI, using oral administration of spores of non-toxin producing C. difficile. According to published literature, approximately 20 to 30 percent of patients suffering from CDI will have
at least one episode of relapse of disease. The goal of our NTCD program is to prevent such recurrence of disease. There is also the potential for NTCD to be used as primary prevention for CDI.

Over the past several years, CDI has increased in severity and incidence. As such, the number of recurrent infections has also increased. According to
a recent survey, 55 percent of participating US hospitals reported an increase in the number of treatment relapses over a recent 12 month period. Because of this dramatic increase, finding new alternatives to prevent recurrent CDI remains an
important medical goal. The underlying concept of this approach is to first treat the disease with an effective product like Vancocin and eradicate the dangerous toxin-producing C. difficilewhich causes severe CDI. The treated
patient could potentially then be dosed with oral NTCD to re-colonize the GI tract and prevent the pathogenic C. difficilebacteria from re-infecting the colon until normal GI flora returns and the patient is no longer susceptible to disease.

In August 2009, dosing began in the Phase 1 clinical trial for NTCD. The Phase 1 study will determine the safety and tolerability of NTCD
dosed orally as single and repeat escalating doses in healthy young (18-45 years of age) and older (60 years of age and older) adults. The study is being conducted in Switzerland. Should the therapy be well tolerated, we plan to initiate NTCD repeat
dosing in older adults following exposure to oral antibiotics.



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Antibiotic use is associated with disruption of gastrointestinal flora which renders individuals susceptible to C. difficilecolonization. The goal of NTCD dosing following antibiotic
exposure is to colonize with this non-toxigenic strain of C. difficile and to prevent colonization by toxigenic strains, thereby preventing disease. We expect the results of this Phase 1 clinical trial in the second half of 2010.

CMV Program

We
continue to evaluate our maribavir program in light of the Phase 3 clinical trial results. On February 9, 2009, we announced that our Phase 3 trial evaluating maribavir used as prophylaxis in allogeneic stem cell, or bone marrow, transplant
(SCT) patients did not achieve its primary endpoint. In the primary analysis, there was no statistically significant difference between maribavir and placebo in reducing the rate of CMV disease. In addition, the study failed to meet its key
secondary endpoints. Maribavir was generally well tolerated in this clinical study.

On February 13, 2009, we announced that enrollment
in our Phase 3 trial evaluating maribavir in liver transplant patients was discontinued and that all patients on study drug were moved to current standard of care. This decision was made based on the results of the Phase 3 study of maribavir in stem
cell transplant patients, and the recommendation from our independent Data Monitoring Committee who considered the rate of viremia in both arms of the study. Subsequent to our announcements in February 2009, we have continued to wind down our two
Phase 3 studies evaluating maribavir.

CMV is a member of the herpes virus group, which includes the viruses that cause chicken pox,
mononucleosis, herpes labialis (cold sores) and genitalis (genital herpes). Like other herpes viruses, CMV has the ability to remain dormant in the body for long periods of time. CMV infection rates average between 40% and 85% of adults in North
America and Europe. In most individuals with intact immune systems, CMV causes little to no apparent illness. However, in immunocompromised individuals, CMV can lead to serious disease or death. Currently, patients who are immunosuppressed following
hematopoietic stem cell or solid organ transplantation remain at high risk of CMV infection. In these patients, CMV can lead to severe conditions such as pneumonitis, gastroenteritis, or even death.

Business Development

We intend to continue to evaluate in-licensing or other opportunities to acquire products in development, or those that are currently on the market. We plan to seek products that treat serious or life threatening illnesses with a high unmet
medical need, require limited commercial infrastructure to market, and that have the potential to provide both top and bottom line growth over time.

Competition for products currently in clinical development, or that are currently on the market, is intense and may require significant resources. There is no assurance that we will be successful in acquiring such products, or that such
products can be acquired on terms acceptable to us. Additionally, if we are successful in acquiring a marketed product, we may have to expand our sales and marketing infrastructure both in the US and internationally. There is no assurance that we
would be successful in expanding our commercial capabilities, that we would be able to penetrate the markets for any such products or that we could achieve market acceptance of our products. There are also no assurances that we will be able to
obtain financing for acquiring such products or to expanding our operations to realize the products potential.

In October 2008, we completed
our acquisition of Lev. Lev was a biopharmaceutical company focused on developing and commercializing therapeutic products for the treatment of inflammatory diseases. The terms of the merger agreement provided for the conversion of each share of Lev
common stock into upfront consideration in the aggregate amount of $453.1 million, or $2.75 per Lev share, comprised of $2.25 per share in cash and $0.50 per share in ViroPharma common stock, and contingent consideration (CVRs) of up to $1.00 per
share which may be paid upon the achievement of certain regulatory and commercial milestones.



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As part of the merger consideration payable to the former stockholders of Lev, we agreed to make up to two
CVR payments upon the achievement of regulatory and commercial targets. As of December 31, 2009, only the second CVR as described below remains achievable. The target for the first CVR payment of $0.50 per share (or $87.5 million) is no longer
achievable and will not be paid as during the fourth quarter of 2009, a third partys human C1 inhibitor product was approved for the acute treatment of HAE and granted orphan exclusivity. The second CVR payment of $0.50 per share ($87.5
million) becomes payable if Cinryze reaches at least $600 million in cumulative net product sales by October 2018.

Strategic Relationships

Cinryze and Sanquin

Pursuant to the terms of an existing Distribution and Manufacturing Services Agreement between our subsidiary ViroPharma Biologics, Inc. (VP
Biologics) with Stichting Sanquin Bloedvoorziening (Sanquin Blood Supply Foundation) (Sanquin) (the Original Sanquin Agreement), we held (i) the exclusive right to distribute, market, offer for sale, sell, import
and promote C1-INH derived from human plasma (including Cinryze) manufactured by Sanquin for the treatment of HAE in all countries in North America and South America (other than the Dutch Overseas Territories, Argentina and Brazil) and Israel, and
(ii) a right of first refusal to distribute, market, offer for sale, sell, import and promote C1-INH derived from human plasma manufactured by Sanquin for the treatment of HAE in certain other geographic regions and under certain conditions.

On January 8, 2010 we obtained the exclusive rights to research, develop, import, use, sell and offer for sale C1-INH derived products
(other than Cetor) worldwide, other than the Excluded Territory (as defined below) for all potential indications pursuant to a Manufacturing and Distribution Agreement (Europe and ROW) between our European subsidiary, ViroPharma SPRL (VP
SPRL) and Sanquin (the ROW Agreement). The Excluded Territory includes (i) certain countries with existing distributors of Cinryze, Cetor and Cetor NF namely France, Ireland, the United Kingdom, Egypt, Iran, Israel, Indonesia,
Turkey, Argentina and Brazil (the Third Party Distributors) and (ii) countries in which Sanquin has historically operated namely, Belgium, Finland, Luxemburg and The Netherlands (including the Dutch Overseas Territories) (the
Precedent Countries and collectively, the Excluded Territory). In the event that any agreement with a Third Party Distributor in the Excluded Territory is terminated, we have a right of first refusal to obtain the foregoing
exclusive licenses to the C1-INH derived products with respect to such terminated country.

Also on January 8, 2010, we amended and
restated the Original Sanquin Agreement (the Restated US Agreement). Pursuant to the terms of the Restated US Agreement, we retained the rights to distribute, market, offer for sale, sell, import and promote C1-INH derived from human
plasma (including Cinryze) manufactured by Sanquin for the treatment of HAE in all countries in North America and South America (other than the Dutch Overseas Territories, Argentina and Brazil) and Israel.

The initial term of the Restated US Agreement ends on December 31, 2015. The term will automatically renew for up to eighteen years (comprised of six
three-year periods), unless the Restated US Agreement is earlier terminated by either party. Sanquin may terminate this Restated US Agreement by providing written notice to us at least three years prior to the end of the initial term or any
subsequent renewal period. We may terminate the Restated US Agreement by providing written notice to Sanquin at least two years prior to the end of the initial term or any subsequent renewal period. Each party may terminate the Restated US Agreement
upon written notice in the event of: (i) an uncured material breach of the other party or (ii) the other party is declared insolvent or bankrupt, a voluntary petition of bankruptcy is filed by the other party, the other party makes or
executes any assignment for the benefit of creditors or a receiver is appointed to control the business of the other party.

The initial term
of the ROW Agreement will end on December 31, 2019, but shall automatically renew for up to eighteen years (comprised of six three-year periods), unless the ROW Agreement is earlier terminated by either party. Sanquin may terminate the ROW
Agreement by providing written notice to us at least three years prior to the end of the initial term or any subsequent renewal period. We may terminate the ROW Agreement by



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providing written notice to Sanquin at least two years prior to the end of the initial term or any subsequent renewal period. Each party may terminate the ROW Agreement upon written notice to the
other in the event of: (i) an uncured material breach of the other party or (ii) in the event that other party (1) applies for or consents to an appointment of a receiver for itself or all or substantially all of its assets,
(2) makes an assignment for the benefit of creditors, (3) commences a voluntary case or bankruptcy or consents to any bankruptcy or restructuring relief or the appointment of or taking possession of its property in any such proceeding or
(4) takes any corporate action to effect any of the foregoing.

In January 2010, both parties established a Joint Steering Committee
comprised of an equal number of representatives from each of the parties to the agreements. The Joint Steering Committee shall serve as a forum to establish and discuss progress under, among others, (i) a global commercialization plan;
(ii) clinical development programs of ViroPharma and Sanquin early stage research programs; (iii) manufacturing capacity schedules; (iv) pharmacovigilence matters; (v) quality matters; (vi) manufacturing improvement
programs; and (vii) regulatory matters.

Subject to certain terms of each of the Restated US Agreement and the ROW Agreement, if we do
not use commercially reasonable efforts to file applications for marketing authorization of Cinryze or launch Cinryze in accordance with a commercialization plan for the applicable territories, as approved by the Joint Steering Committee, Sanquin
may (upon prior written notice to us) terminate our rights in the applicable country.

In addition, pursuant to the terms of the ROW
Agreement, Sanquin may conduct certain early stage research programs (the Early Stage Research Programs), and we will provide to Sanquin 1,000,000 (approximately $1.4 million) per year for a period of five years to support
such Early Stage Research Programs. We have a right of first refusal to further develop and commercialize the subject matter of each such Early Stage Research Program worldwide (except for the Excluded Territory) subject to Sanquins and its
research partners right to use any such intellectual property for their internal, non-commercial research purposes. Except for the Early Stage Research Programs, we will be solely responsible for conducting all clinical trials and other
development activities necessary to support our efforts to obtain regulatory approval of Cinryze in additional territories as well as any future C1-INH derived products developed pursuant to the ROW Agreement. Sanquin has the right to approve any
such clinical trials and development activities through the Joint Steering Committee.

Sanquin may include in its regulatory dossiers
improvements to Cinryze for the hereditary angioedema (HAE) indication, solely for the marketing and sale of Cetor or Cetor NF in the Excluded Territory. If there are (i) new indications relating to any C1-INH product or
(ii) improvements relating to the HAE-indication that cannot be included in Sanquins regulatory dossiers, Sanquin will receive a royalty-free license to sell Cinryze or the future product for these new indications or improvements in the
Precedent Countries.

Sanquin has agreed to indemnify us and our affiliates for certain losses, except to the extent we have an obligation to
indemnify Sanquin. We have agreed to indemnify Sanquin and its affiliates for all losses arising from (i) our infringement of any third partys intellectual property as a result of the sale of Cinryze or any future C1-INH derived products
in the territories covered by the agreements, (ii) a breach by us of the terms of the agreements, (iii) certain tax liabilities and (iv) our negligence or willful misconduct, except, in each case, to the extent Sanquin has an
obligation to indemnify us.

Without Sanquins prior written consent, we shall not enter into a merger, be acquired by or sell
substantially all of our assets to a manufacturer and/or distributor of a plasma derived C1 esterase inhibitor or another plasma-derived product approved under applicable law for marketing for the same or comparable clinical indications as Cinryze
or any future C1-INH derived products. We may not, without the consent of Sanquin, distribute, market, offer for sale, sell, import or promote any competitive product in the territory covered by the Restated US Agreement until December 31,
2018. In addition, we may not, without the consent of Sanquin, distribute, market, offer for sale, sell, import or promote any competitive product in the territories covered by the ROW Agreement until December 31, 2019.



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In the event that VP Biologics has become bankrupt or insolvent and has committed an uncured breach of the
Restated US Agreement, Sanquin will immediately obtain VP Biologics rights to the marketing authorizations for Cinryze obtained by us and the applications for marketing authorization of Cinryze filed by us. ViroPharma Incorporated will
guarantee VP Biologics performance under the Restated US Agreement. In the event that VP SPRL becomes bankrupt or insolvent and commits an uncured breach of the ROW Agreement, Sanquin will immediately obtain our rights to the regulatory
approvals for the products obtained by us under the ROW Agreement and the applications for regulatory approval of the product filed by us under the ROW Agreement. ViroPharma Incorporated will guarantee VP SPRLs performance under the ROW
Agreement in the event of a bankruptcy.

Vancocin Capsules and Lilly

In November 2004, we acquired all rights in the U.S. and its territories to manufacture, market and sell Vancocin, the oral capsule formulation of vancomycin
hydrochloride, as well as rights to certain related vancomycin products, from Lilly. Vancocin is a potent antibiotic approved by the FDA to treat antibiotic-associated pseudomembranous colitis caused by C. difficile and enterocolitis caused
by S. aureus, including methicillin-resistant strains. Lilly retained its rights to vancomycin outside of the U.S. and its territories.

We paid Lilly an upfront cash payment of $116.0 million and we are obligated to pay additional purchase price consideration based on annual net sales of Vancocin through 2011. As of December 31, 2009, we have paid an aggregate of $37.1
million to Lilly in additional purchase price consideration, as our net sales of Vancocin surpassed the maximum obligation level of $65 million in 2005 through 2009.

For annual net sales during 2010 through 2011, we are obligated to pay additional amounts of 35% on net sales between $45 and $65 million. No additional payments are due to Lilly on net sales of Vancocin
below or above the net sales levels. We account for additional purchase price consideration as contingent consideration and record an adjustment to the carrying amount of the related intangible assets and a cumulative adjustment to the intangible
amortization upon achievement of the related sales milestones. See Note 6 of the Consolidated Financial Statements for additional information regarding intangible assets and amortization.

In the event we develop any product line extensions, revive discontinued vancomycin product lines (injectable or oral solutions), make improvements of
existing products, or expand the label to cover new indications, Lilly would receive a royalty on net sales on these additional products for a predetermined time period.

Cytomegalovirus and GlaxoSmithKline

In August 2003, we entered into a license
agreement with GlaxoSmithKline (GSK) under which we acquired worldwide rights (excluding Japan) to an antiviral compound, maribavir, for the treatment of CMV disease. Maribavir is a benzimidazole compound that was in development by GSK for the
treatment of CMV retinitis in HIV positive patients.

Under the terms of the agreement, we have exclusive worldwide rights (excluding Japan)
to develop and commercialize maribavir for the prevention and treatment of cytomegalovirus infections related to transplant (including solid organ and hematopoietic stem cell / bone marrow transplantation), congenital transmission, and in patients
with HIV infection. The patents covering maribavir expire in 2015. We paid GSK a $3.5 million up-front cash licensing fee and will pay additional milestone payments based upon defined clinical development and regulatory events. In the third quarter
of 2006, we recorded a $3.0 million milestone payment due to GSK associated with the initiation of the phase 3 study of maribavir, which was paid in February 2007. No additional amounts were recorded in 2007. We also will pay royalties to GSK and
its licensor on product sales in the U.S. and rest of world (excluding Japan). We will be dependent on GSK to prosecute and maintain the patents related to maribavir, and to file any applications for patent term extension. We also may be dependent
on GSK to protect such patent rights. We have the right to sublicense our rights under the agreement, which under certain circumstances requires consent from GSK.



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Picornaviruses and Merck

In November 2004, we entered into a license agreement with Merck under which Merck has assumed responsibility for all future development and
commercialization of pleconaril in the U.S. and Canada. Merck paid us an upfront option fee of $3.0 million in November 2003. In August 2004, Merck exercised its option to enter into a full license agreement with us following its assessment of the
products performance in characterization studies. Merck paid us an initial license fee of $10.0 million in December 2004 and purchased our inventory of bulk drug substance for an additional $6.0 million in January 2005. We are also eligible to
receive up to an additional $65.0 million in milestone payments upon achievement of certain targeted regulatory and commercial events, as well as royalties on Mercks sales of intranasal pleconaril in the licensed territories. Merck is now
responsible for the development and commercialization of the intranasal formulation of pleconaril for the treatment of the common cold. Sanofi-Aventis has exclusive rights to market and sell pleconaril in countries other than the U.S. and Canada.

Picornaviruses and Sanofi-Aventis

In our agreement with Sanofi-Aventis, originally entered into in December 1995 and amended and restated in February 2001, we received exclusive rights under patents owned by Sanofi-Aventis to develop and
market all products relating to pleconaril and related compounds for use in picornavirus disease indications in the U.S. and Canada, as well as a right of first refusal for any other indications in the U.S. and Canada. We further amended our
agreement with Sanofi-Aventis in November 2003 in connection with our entry into the option agreement with Merck in respect of intranasal pleconaril. As a result of Mercks August 2004 exercise of its option to continue the development and
commercialization of pleconaril, the November 2003 amendment provided that, amongst other things, the royalty rate payable to Sanofi-Aventis was reduced. Pleconaril is covered by one of the licensed U.S. patents, which expires in 2012, and one of
the licensed Canadian patents, which expires in 2013. We will be dependent on Sanofi-Aventis to prosecute and maintain certain of these patents, and to file any applications for patent term extension. We also may be dependent on Sanofi-Aventis to
protect such patent rights.

Under our agreement with Sanofi-Aventis, until the expiration or termination of the agreement, we must make
royalty payments on any sales of products in the U.S. and Canada developed under the agreement, which royalty payments will be reduced upon the expiration of the last patent on pleconaril or any related drug, except for reduced royalty payments on
Mercks sales of the drug, if any, which extends indefinitely. We are entitled to royalties from Sanofi-Aventis on sales of products by Sanofi-Aventis outside the U.S. and Canada. Sanofi-Aventis will make a milestone payment to us upon
submission of pleconaril for regulatory approval in Japan. We are required to pay a portion of these royalties and milestones payable to Merck under our agreement with them.

Our patent licenses under the amended and restated agreement with Sanofi-Aventis terminate on the later of expiration of the last patent licensed to us under the agreement or ten years following our first
sale of a product in the U.S. or Canada containing a compound licensed to us under the agreement, or earlier under certain circumstances. In the event that our rights to use Sanofi-Aventiss patents and trademarks terminate, under certain
circumstances the agreement may restrict our ability to market pleconaril and compete with Sanofi-Aventis. In addition, Sanofi-Aventis has the right to terminate the agreement if we are subject to a change of control that would materially and
adversely affect the development, manufacturing and marketing of the products under the agreement. The term automatically renews for successive five-year terms unless either party gives six months prior written notice of termination. We also
have the right to manufacture, or contract with third parties to manufacture, any drug product derived from the pleconaril drug substance.

Manufacturing and Distribution

We currently utilize a virtual supply manufacturing
and distribution chain in which we do not have our own facilities to manufacture commercial or clinical trial supplies of drugs and we do not have our own distribution facilities. Additionally, we do not intend to develop such facilities for any
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contract with third parties for the manufacture, warehousing, order management, billing and collection and distribution of our products and product candidates. This virtual approach allows us the
flexibility to adapt as our pipeline advances.

Cinryze

In conjunction with the Lev acquisition, we acquired a Distribution and Manufacturing Services Agreement with Sanquin, which was amended and restated in
January 2010 as described above. Additionally, in January 2010, we entered into the ROW Agreement as described above.

Restated U.S. Agreement

The terms of the Restated US Agreement related to manufacturing provide that Sanquin shall manufacture
Cinryze for us on a toll manufacturing basis, using plasma supplied by us, for a manufacturing fee. During the term, we shall purchase from Sanquin an annual minimum quantity of Cinryze established by the parties for such calendar year.

Sanquin is implementing structural and equipment changes to its Amsterdam and Brussels manufacturing facilities. We previously funded such changes to the
Brussels manufacturing facility and a portion of such changes to the Amsterdam manufacturing facility, each through a loan facility of an aggregate amount of 7,500,000 (approximately $10.4 million). Pursuant to the Restated US Agreement,
Sanquin will implement additional structural and equipment changes to the Brussels manufacturing facility, financed through an additional 5,000,000 (approximately $7.2 million) loan facility provided by us. Sanquin will repay all such loan
amounts by January 1, 2015 by providing us with a discount to the per unit purchase price of product.

Sanquin will use commercially
reasonable efforts to obtain regulatory approval to manufacture Cinryze in the Amsterdam manufacturing facility prior to a date agreed to by the parties. Sanquin will enter into manufacturing agreements with one or more third party manufacturers,
which may include affiliates of Sanquin, (reasonably acceptable to us) pursuant to which such third party manufacturers shall provide certain back-up manufacturing facilities for Cinryze. In the event that certain events occur which result in
Sanquin permanently ceasing to manufacture Cinryze, Sanquin will grant us a perpetual license under its intellectual property related to Cinryze and assign to us each of the agreements with such third party manufacturers. In consideration thereof,
we will pay a one-time fee to Sanquin as well as a royalty on future sales of Cinryze or any future C1-INH product.

ROW
Agreement

The terms of the ROW Agreement related to manufacturing provide that Sanquin will manufacture Cinryze either based on a supply
of plasma provided by Sanquin or on a toll-manufacturing basis using plasma supplied by us for a manufacturing fee. The manufacturing fee will be comprised of a base fee and a royalty which shall vary based upon the source of the plasma utilized.
The parties will negotiate in good faith a new purchase price and manufacturing fee for any additional new products developed in accordance with the terms of the ROW Agreement. Beginning in 2015, we shall purchase at least a minimum quantity of
Cinryze or future C1-INH product from Sanquin annually, which quantities shall be determined by the Joint Steering Committee in 2013.

Sanquin
will enter into manufacturing agreements with one or more third party manufacturers, which may include affiliates of Sanquin, (reasonably acceptable to us) pursuant to which such third party manufacturers shall provide certain back-up manufacturing
facilities for the products. In the event that certain events occur which result in Sanquin permanently ceasing to manufacture Cinryze of future C1-INH derived products, Sanquin will grant us a perpetual license under its intellectual property
related to Cinryze or any future C1-INH product and assign to us each of the agreements with such third party manufacturers. In consideration thereof, we will pay a one-time fee to Sanquin as well as a royalty on future sales of Cinryze or any
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Plasma

Cinryze is derived from human plasma sourced from commercial plasma suppliers. The sourcing of plasma, and the production of products derived from plasma, is regulated extensively by the FDA and other
medical product and health care regulatory agencies. We rely on a combination of sources for plasma including (i) long term supply agreements, (ii) periodic spot purchases of plasma from third party plasma suppliers, and
(iii) we are exploring options to acquire our own plasma centers.

Supply Agreement with DCI Management Group, LLC

In connection with our acquisition of Lev, we became party to a supply agreement for the purchase and sale of plasma with DCI
Management Group, LLC pursuant to which we will purchase quantities of U.S. Source Plasma to be utilized in the production of product under our Distribution and Manufacturing Services Agreement with Sanquin Blood Supply Foundation. In July 2009 we
amended the terms of the agreement. Under the amended agreement, the supplier agreed to sell us specified annual quantities of plasma in accordance with applicable good manufacturing practices. Our annual purchase commitment is between $19.3 million
and $25.4 million for the balance of the term of the agreement. Our contractual purchase commitments are subject to annual percentage increases based on market conditions and do not include the cost of additional pre-delivery testing which we may
require the supplier to undertake. We estimate our remaining commitment under this agreement to be approximately $139.0 million.

The amended
agreement expires December 31, 2015, unless sooner terminated in accordance with its terms. Either party may terminate the agreement upon written notice if the other party is in material breach of any provision thereof, subject to applicable
cure periods. Subject to the suppliers ability to mitigate damages, in the event we are in default of our payment obligation under the contract, we will be liable to purchase the minimum quantities of plasma specified under the contract for
the balance of the term. Upon expiration of the agreement, or in the event the agreement is terminated for reasons other than as set forth above, we will be obligated to purchase a closing inventory of plasma in the quantity specified in the
agreement.

Intermediate Supply Agreement with Biotest AG

On June 19, 2009, we entered into an intermediate supply agreement (the Supply Agreement) with Biotest AG (Biotest) pursuant to which we will sell to Biotest all excess output
of specific intermediate plasma products (the Intermediates) derived from the plasma processed by Sanquin in manufacturing Cinryze. In addition, we offered Biotest a right of first refusal to purchase unprocessed plasma in the event we
elect to sell unprocessed plasma to a third party. Biotest also agreed to provide us with a right of first refusal, subject to certain exceptions, to repurchase certain by products derived from the Intermediates. The Supply Agreement has an initial
term expiring December 31, 2014, unless sooner terminated. In addition we established pricing for a pre-determined volume of source plasma (the Target Volume), provided that the parties shall renegotiate pricing terms upon
achievement of the Target Volume. Either party may terminate the Supply Agreement upon written notice if the other party is in material breach of any provision thereof, subject to applicable cure periods. In the event of a breach of the Supply
Agreement by Biotest, Biotest shall be liable to purchase all amounts of Intermediates deliverable under the Supply Agreement during its remaining term.

Purchase Agreement with Plasma Centers of America, LLC

On April 3, 2008, we entered
into a purchase agreement with Plasma Centers of America, LLC (PCA) pursuant to which we and PCA will, subject to the terms and conditions of the purchase agreement, consummate the following transactions: (1) construction of three new plasma
collection centers (New Centers) by PCA; (2); the acquisition by us of a maximum of the three new plasma collection centers, assuming the satisfaction of certain performance targets by PCA and (3) purchase by us of source plasma from each of
these new collection centers in accordance with the terms of the purchase agreement.



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On October 20, 2009, we and PCA entered into a letter agreement providing for the termination of the
purchase agreement with PCA dated April 3, 2008. Pursuant to the Letter Agreement, the Purchase Agreement was immediately terminated and ViroPharma is no longer obligated to perform its obligations under the Purchase Agreement. The Letter
Agreement provides that PCA shall not be obligated to refund any payments previously made by ViroPharma to PCA, and also contains mutual releases between the parties. The parties determined to mutually terminate the Purchase Agreement following
disagreements regarding project timelines.

Vancocin

In December 2005 we entered into a toll manufacturing agreement with NPI Pharmaceuticals (formerly OSG Norwich Pharmaceuticals, Inc.) to produce finished
Vancocin product. The qualification process required to transfer Vancocin manufacturing from Lilly to NPI Pharmaceuticals was completed in February 2006. All approvals were finalized in the second quarter of 2006 and, since June 30, 2006, all
of our finished product has been supplied from NPI Pharmaceuticals. In April 2006, we also entered into an agreement with Alpharma, Inc. for the manufacturing of API for Vancocin. In October, 2007, we amended this agreement with Alpharma to extend
the agreement until December 2011 and identified an additional production facility that will produce API in the future. Prior to our agreement with NPI, we purchased Vancocin from Lilly from November 2004 until the second quarter 2006.

We require in our manufacturing and processing agreements that all third-party contract manufacturers and processors produce drug substance and product
in accordance with the FDAs current Good Manufacturing Practices and all other applicable laws and regulations. We maintain confidentiality agreements with potential and existing manufacturers in order to protect our proprietary rights related
to our marketed drug and drug candidates.

We expect to continue to rely solely on our collaborators and third-party manufacturers to
manufacture drug substance and final drug products for both clinical development and commercial sale.

Customers

We sell our products directly to wholesale drug distributors and specialty pharmacies/specialty distributors who then distribute the
product to pharmacies, hospitals, patients, physicians and long term care facilities, among others. Net product sales to customers who accounted for 10% or more of our net product sales during the years ended December 31, 2009, 2008 and 2007
are as follows:



|           |      |                              |   |      |    |   |      |    |  
|---------- | ---- | ---------------------------- | - | ---- | -- | - | ---- | -- | -
|           |      | Percentage of total revenues |  
|           | 2009 |                              |   | 2008 |    |   | 2007 |   
|Customer A |      | 29                           | % |      | 39 | % |      | 37 | %
|Customer B |      | 25                           | % |      | 38 | % |      | 40 | %
|Customer C |      | 13                           | % |      | 17 | % |      | 16 | %
|Customer D |      | 12                           | % |      |   |   |      |   |  
|           |      |                              |   |      |    |   |      |    |  
|Total      |      | 79                           | % |      | 94 | % |      | 93 | %
|           |      |                              |   |      |    |   |      |    |  

In 2009, four wholesalers represented 79% of our total net product sales. We do not believe that the loss of any one of
these wholesalers would have a material adverse effect on product sales because product sales would shift to other wholesalers or alternative forms of distribution. However, the loss of a wholesaler could increase our dependence on a reduced number
of wholesalers. We have entered into distribution service agreements with the parties identified in the table above.



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Marketing and Sales

Our initial sales organization was established in 2008 in the Northeastern U.S. to target doctors and hospitals to promote Vancocin. With the commercial
launch of Cinryze, we have transitioned our existing sales force and expanded our sales force to target doctors who treat patients who have been diagnosed with HAE. Given the relatively limited HAE patient population, our U.S. sales force is small
compared to other drugs with similar gross revenues. Our sales force primarily focuses its efforts towards allergists, immunologists and home healthcare providers.

Foreign Operations

We conduct business in European countries through wholly-owned
subsidiaries. Our international businesses are subject to risks customarily encountered in foreign operations, including fluctuations in foreign currency exchange rates and controls, import and export controls and other economic, political and
regulatory policies of local governments. We currently have operations in Belgium, the United Kingdom, France and Switzerland. In anticipation of our commercial sales launch of Cinryze in Europe and certain other countries, we intend to expand our
own commercial organizations in such territories and markets and sell Cinryze through our own sales force in these territories. This infrastructure expansion will result in additional costs in future periods. Outside of the United States and
European territories, we will evaluate sales efforts on a country-by-country basis, and it is possible that we will rely on relationships with one or more companies with established distribution systems and direct sales forces in such countries.

Patents and Proprietary Technology

We believe that patent protection and trade secret protection are important to our business and that our future will depend, in part, on our ability to maintain our technology licenses, maintain trade
secret protection, obtain patents and operate without infringing the proprietary rights of others both in the U.S. and abroad. The last core patent protecting Vancocin expired in 1996. There are no core patents protecting Cinryze. In order to
continue to obtain commercial benefits from Vancocin, we will rely on product manufacturing trade secrets, know-how and related non-patent intellectual property, and regulatory barriers to competitive products. We own three pending U.S. patent
applications covering vancomycin related technology. One issued U.S. patent and two pending U.S. patent applications describing compounds, compositions and methods for treating respiratory syncytial virus (RSV) diseases have been transferred to
another party. We have two issued U.S. patents and one pending U.S. patent application covering compounds, compositions and methods of treating and preventing picarnovirus disease and one pending U.S. patent application covering methods of reducing
rhinovirus contagion. We have three issued U.S. patents, six non-U.S. patents and four pending U.S. patent applications that we co-own with a single development collaborator describing compounds and methods for treating hepatitis C and related virus
diseases, including a patent application family that covers HCV-796 and claims related compounds, compositions and methods of use for the treatment of HCV infections. We have one pending U.S. patent application covering benzimidazole related
technology. We also have filed international, regional and non-U.S. national patent applications in order to pursue patent protection in major foreign countries.

As patent applications in the U.S. are maintained in secrecy until patents are issued (unless earlier publication is required under applicable law or in connection with patents filed under the PCT) and as
publication of discoveries in the scientific or patent literature often lags behind the actual discoveries, we cannot be certain that we or our licensors were the first to make the inventions described in each of these pending patent applications or
that we or our licensors were the first to file patent applications for such inventions. Furthermore, the patent positions of biotechnology and pharmaceutical companies are highly uncertain and involve complex legal and factual questions, and,
therefore, the breadth of claims allowed in biotechnology and pharmaceutical patents or their enforceability cannot be predicted. We cannot be sure that any patents will issue from any of these patent applications or, should any patents issue, that
we will be provided with adequate protection against potentially competitive products. Furthermore, we cannot be sure that should patents issue, they will be of commercial value



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to us, or that private parties, including competitors, will not successfully challenge these patents or circumvent our patent position in the U.S. or abroad. In the absence of adequate patent
protection, our business may be adversely affected by competitors who develop comparable technology or products.

Pursuant to the terms of the
Uruguay Round Agreements Act, patents filed on or after June 8, 1995 have a term of twenty years from the date of filing, irrespective of the period of time it may take for the patent to ultimately issue. This may shorten the period of patent
protection afforded to our products as patent applications in the biopharmaceutical sector often take considerable time to issue. Under the Drug Price Competition and Patent Term Restoration Act of 1984, a sponsor may obtain marketing exclusivity
for a period of time following FDA approval of certain drug applications, regardless of patent status, if the drug is a new chemical entity or if new clinical studies were used to support the marketing application for the drug. Pursuant to the FDA
Modernization Act of 1997, this period of exclusivity can be extended if the applicant performs certain studies in pediatric patients. This marketing exclusivity prevents a third party from obtaining FDA approval for a similar or identical drug
under an Abbreviated New Drug Application or a 505(b)(2) New Drug Application.

The Drug Price Competition and Patent Term
Restoration Act of 1984 also allows a patent owner to obtain an extension of applicable patent terms for a period equal to one-half the period of time elapsed between the filing of an Investigational New Drug Application, or IND, and the filing of
the corresponding New Drug Application, or NDA, plus the period of time between the filing of the NDA and FDA approval, with a five year maximum patent extension. We cannot be sure that we will be able to take advantage of either the patent term
extension or marketing exclusivity provisions of this law.

In order to protect the confidentiality of our technology, including trade secrets
and know-how and other proprietary technical and business information, we require all of our employees, consultants, advisors and collaborators to enter into confidentiality agreements that prohibit the use or disclosure of confidential information.
The agreements also oblige our employees, and to the extent practicable, our consultants, advisors and collaborators, to assign to us ideas, developments, discoveries and inventions made by such persons in connection with their work with us. We
cannot be sure that these agreements will maintain confidentiality, will prevent disclosure, or will protect our proprietary information or intellectual property, or that others will not independently develop substantially equivalent proprietary
information or intellectual property.

The pharmaceutical industry places considerable importance on obtaining patent and trade secret
protection for new technologies, products and processes. Our success depends, in part, on our ability to develop and maintain a strong patent position for our products and technologies in clinical development, both in the U.S. and in other
countries. Litigation or other legal proceedings may be necessary to defend against claims of infringement, to enforce our patents, or to protect our trade secrets, and could result in substantial cost to us and diversion of our efforts. We intend
to file applications as appropriate for patents describing the composition of matter of our drug candidates, the proprietary processes for producing such compositions, and the uses of our products and drug candidates.

Government Regulation

The FDA and comparable regulatory agencies in state and local jurisdictions and in foreign countries impose substantial requirements on the clinical development, licensure, manufacture, distribution and marketing of pharmaceutical products.
These agencies and other federal, state and local entities regulate research and development activities and the testing, manufacture, processing, quality control, safety, effectiveness, labeling, packaging, storage, handling, distribution, record
keeping, approval, advertising, marketing, and promotion of our products. All of our products will require FDA regulatory approval before commercialization. In particular, therapeutic products for human use are subject to rigorous preclinical and
clinical testing and other requirements of the Federal Food, Drug, and Cosmetic Act, implemented by the FDA, as well as similar statutory and regulatory requirements of foreign countries. Obtaining these marketing approvals and subsequently
complying with ongoing statutory and regulatory requirements is costly and time consuming. Any failure by us or our



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collaborators, licensors or licensees to obtain or maintain, or any delay in obtaining, regulatory approval or in complying with other requirements, could adversely affect the commercialization
of products then being developed by us and our ability to receive product or royalty revenues.

The steps required before a new drug product
may be distributed commercially in the U.S. generally include:



| |  |  | conducting appropriate preclinical laboratory evaluations of the products chemistry, formulation and stability, and animal studies to assess the
potential safety and efficacy of the product;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | submission to the FDA of an Investigational New Drug Application, including the results of preclinical evaluations and tests, along with manufacturing
information and analytical data plus any clinical data if the product previously was administered to humans including outside the US;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | obtaining approval of Institutional Review Boards, or IRBs, to introduce the drug into humans in clinical studies;
| | - |  | ------------------------------------------------------------------------------------------------------------------



| |  |  | conducting adequate and well-controlled human clinical trials that establish the safety and efficacy of the drug product candidate for the intended
use, typically in the following three sequential, or slightly overlapping stages:
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Phase 1: The drug is initially introduced into healthy human subjects or patients and tested for safety, dose tolerance, absorption, metabolism,
distribution, excretion and evidence of biological activity;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Phase 2: The drug is studied in controlled, exploratory therapeutic trials in a limited number of patients to identify possible adverse effects and
safety risks, to determine dose tolerance and the optimal effective dosage, and to collect initial efficacy data of the product for specific targeted diseases or medical conditions;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Phase 3: The drug is studied in an expanded, adequate, well-controlled patient population at multiple clinical study sites to demonstrate efficacy and
safety at the optimized dose by measuring a primary endpoint established at the outset of the study;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | submitting the results of basic research, including pharmacology and mechanisms of action animal studies, and clinical studies as well as chemistry,
manufacturing and controls information and patent certification information on the drug to the FDA in a NDA or BLA;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | undergoing a successful FDA pre-approval inspection prior to approval of an NDA or BLA; and
| | - |  | -------------------------------------------------------------------------------------------



| |  |  | obtaining FDA approval of the NDA or BLA prior to any commercial sale or shipment of the drug or biologic product.
| | - |  | ------------------------------------------------------------------------------------------------------------------

This process generally takes a number of years and typically requires substantial financial resources, and we cannot be certain that any approval will be
granted on a timely basis, if at all. The results of preclinical studies and initial clinical trials are not necessarily predictive of the results from large-scale clinical trials, and all clinical trials may be subject to additional costs, delays
or modifications due to a number of factors, including the difficulty in obtaining enough patients, clinical investigators, drug supply, or financial support, or because of unforeseen adverse effects or efficacy issues. In addition, an independent
IRB at each clinical site proposing to conduct the clinical trials must review and approve each study protocol and oversee the conduct of the trial. The FDA may also raise questions about the conduct of the trials as outlined in the IND and impose a
clinical hold on the trial. If a clinical hold is imposed, all of FDAs concerns must be resolved before the trial may begin again. Preclinical and clinical studies take several years to complete, and there is no guarantee that an IND we submit
will result in a submission of an NDA or BLA within any specific time period, if at all. Similar risks and uncertainties apply to the conduct and approval for licensure and marketing a product in non-U.S. markets around the world.

The FDA has issued regulations intended to expedite the approval process for the development, evaluation and marketing of new therapeutic products intended
to treat life-threatening or severely debilitating diseases,



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especially where no alternative therapies exist. If applicable, these provisions may streamline the traditional product development process in the U.S. Similarly, products that represent a
substantial improvement over existing therapies may be eligible for priority review and a FDA expedited review time of six months. Nonetheless, even if a product is eligible for these programs, or for priority review, approval may be denied or
delayed by the FDA or additional trials may be required. As a condition of approval FDA also can require further testing of the product and monitoring of the effect of commercialized products such as in a Risk Evaluation and Mitigation Strategy
(REMS) requirement, including restricted access to the product and potential registries in the US and to a greater extent in Europe, formalized requirements to access pediatric safety and effectiveness. The Agency has the power to prevent or limit
further marketing of a product based on the results of these post-approval commitments. Upon approval, a drug or biologic product may be marketed only in those dosage forms and for those indications approved in the NDA or BLA.

Any products manufactured or distributed by us pursuant to FDA approval are subject to extensive continuing post-approval regulation by the FDA, including
record-keeping requirements, obligations to investigate, analyze and report adverse experiences, and possible restrictions on advertising and promotional activities. In addition to continued compliance with standard regulatory requirements, the FDA
also may require post-marketing testing and surveillance to monitor the safety and efficacy of the marketed product. Results of post-marketing studies may limit or expand the further marketing of the products. If we propose any modifications to a
product, including changes in indication, manufacturing process, manufacturing facility or labeling, we may need to submit a NDA or BLA supplement to the FDA, and will not be able to commercialize any product with these modifications until FDA
approval is received. Product approvals may be withdrawn if compliance with regulatory requirements is not maintained or if problems concerning safety or efficacy of the product are discovered following approval.

Congress and regulatory authorities, including the FDA, are considering whether an abbreviated approval process for so-called generic or
follow-on biological products should be adopted. An abbreviated approval process is currently available under the Federal Food, Drug and Cosmetic Act for generic versions of conventional chemical drug compounds, sometimes referred to as
small molecule compounds, but not for biological products approved under the Public Health Service Act through a BLA. Currently, an applicant for a generic version of a small molecule compound only has to reference in its application an approved
product for which full clinical data demonstrating safety and effectiveness exist for the approved conditions of use; demonstrate that its product has the same active ingredients, dosage form, strength, route of administration and conditions of use
and is absorbed in the body at the same rate and to the same extent as the referenced approved drug; include certifications to non-infringement of valid patents listed with the FDA for the referenced approved drug; and await the expiration of any
non-patent exclusivity. Various proposals have been made to establish an abbreviated approval process to permit approval of generic or follow-on versions of biological products. It is unclear as to when, or if, any such proposals may be adopted but
any such abbreviated approval process could have a material impact on our business as follow-on products may be significantly less costly to bring to market and may be priced significantly lower than our products would be.

In addition to obtaining FDA approval for each indication to be treated with each product, each drug or biologic product manufacturing establishment must
register with the FDA, list its drug products with the FDA, comply with current Good Manufacturing Practices (cGMPs) and undergo periodic inspections by the FDA.

In complying with the FDAs cGMP regulations, manufacturers must continue to spend time, money and effort on facilities and equipment, process control, recordkeeping, personnel training, quality
control validation, and auditing to ensure that the marketed product meets applicable specifications and other requirements. The FDA periodically inspects drug or biologic product manufacturing facilities to ensure compliance with cGMPs. Failure to
comply with FDA requirements, including cGMPs, subjects the manufacturer to possible FDA enforcement action, such as untitled letters, Warning Letters, suspension of manufacturing operations, seizure of the product, voluntary or mandatory recall of
a product, injunctive action, consent decrees and/or suspension or revocation of product approval, as well as possible civil and criminal penalties. We currently rely on, and intend to continue to



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rely on, third parties to manufacture our compounds and products. Such third parties will be required to comply with FDA requirements, including cGMPs. We cannot be certain that we, or our
present or future suppliers or third-party manufacturers, will be able to comply with all FDA regulatory requirements, and potential consequences of non-compliance could have a material adverse impact on our business.

Products manufactured in the U.S. for distribution abroad will be subject to FDA regulations regarding export, as well as the requirements of the country to
which they are shipped. These latter requirements are likely to cover the conduct of clinical trials, the submission of marketing applications and all aspects of product manufacture and marketing. Such requirements can vary significantly from
country to country. As part of possible strategic relationships, our collaborators may be responsible for the foreign regulatory approval process of our products, although we may be legally liable for noncompliance. Foreign establishments
manufacturing drug or biologic products for distribution in the U.S. also must register their establishments and list their products with the FDA, and comply with cGMPs. They also are subject to periodic inspection by the FDA or by local authorities
under agreement with the FDA.

The FDAs laws, regulations and policies may change, and additional governmental regulations or
requirements may be enacted that could delay, limit or restrict, or prevent regulatory approval of our products or affect our ability to test, manufacture, market, or distribute our products following approval.

On December 8, 2003, the Medicare Prescription Drug, Improvement and Modernization Act (MMA) was signed into law and provides outpatient prescription
drug coverage to eligible Medicare beneficiaries. The primary prescription drug benefit under the MMA, the new Medicare Part D coverage, began in January 2006. The new Part D prescription drug benefit is administered regionally through
Medicare-approved insurance plans. The legislation allows for the importation of prescription drugs from Canada, but only if the Secretary of the U.S. Department of Health and Human Services certifies to Congress that such importation would pose no
additional risk to the publics health and safety and would result in significant reduction in the cost to customers, which the Secretary thus far has not done. There can be no assurance that this certification requirement will be maintained in
future legislation or that the certification will continue to be withheld. The impact could also be negative over the intermediate and longer term for our business generally as greater federal involvement and budget constraints may increase the
likelihood of additional pricing pressures or controls in the future.

Federal and state governments also have pursued direct methods to
reduce the cost of drugs for which they pay. We participate in state government-managed Medicaid programs as well as certain other qualifying federal and state government programs whereby discounts and mandatory rebates are provided to participating
state and local government entities. We also participate in other programs with government entities, the most significant of which are the U.S. Department of Defense and the U.S. Department of Veterans Affairs. These entities receive minimum
discounts based off a defined non-federal average manufacturer price for purchases. Additional programs in which we participate provide mandatory discounts for outpatient medicines purchased by certain Public Health Service entities and
disproportionate share hospitals (hospitals meeting certain criteria regarding the percentage of needy population served).

Our
operations are also subject to federal and state anti-kickback laws. Certain provisions of the Social Security Act prohibit entities such as us from knowingly and willingly offering, paying, soliciting or receiving any form of remuneration
(including any kickbacks, bribe or rebate) in return for the referral of items or services for which payment may be made under a federal health care program, or in return for the recommendation, arrangement, purchase, lease or order of items or
services for which payment may be made under a federal health care program. Violation of the federal anti-kickback law is a felony, punishable by criminal fines and imprisonment for up to five years or both. In addition, the Department of Health and
Human Services may impose civil penalties and exclude violators from participation in federal health care programs such as Medicare and Medicaid. Many states have adopted similar prohibitions against payments intended to induce referrals of products
or services paid by Medicaid or other third party payors. Several states have also enacted laws requiring recordkeeping, compliance requirements, and reporting of gifts and other value given to healthcare providers.



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Because of the far-reaching nature of these laws, there can be no assurance that the occurrence of one or more violations of these laws would not result in a material adverse effect on our
business, financial condition and results of operations.

We are also subject to various other federal, state and local laws, rules,
regulations and policies relating to safe working conditions, clinical, laboratory and manufacturing practices, environmental protection, the experimental use of animals and the use and disposal of hazardous or potentially hazardous substances,
including radioactive compounds and infectious disease agents, previously used in connection with our research work. Although we believe that our safety procedures for handling and disposing of such materials comply with current federal, state and
local laws, rules, regulations and policies, the risk of accidental injury or contamination from these materials cannot be entirely eliminated. We may also incur significant costs to comply with such laws and regulations now and in the future, and
the failure to comply may have a material adverse impact on our business.

Moreover, we anticipate that Congress, state legislatures and the
private sector will continue to review and assess controls on health care spending. Any such proposed or actual changes could cause us or our collaborators to limit or eliminate spending on development projects and may otherwise affect us. We cannot
predict the likelihood, nature, or extent of adverse governmental regulation that might result from future legislative or administrative action, either in the U.S. or abroad. Additionally, in both domestic and foreign markets, sales of our proposed
products will depend, in part, upon the availability of reimbursement from third-party payors, such as government health administration authorities, managed care providers, private health insurers and other organizations. Significant uncertainty
often exists as to the reimbursement status of newly approved health care products. In addition, third-party payors are increasingly challenging the price and cost effectiveness of medical products and services. There can be no assurance that our
proposed products will be considered cost-effective or that adequate third-party reimbursement will be available to enable us to maintain price levels sufficient to realize an appropriate return on our investment in product research and development.

In the United States, the Orphan Drug Act provides incentives to drug manufacturers to develop and manufacture drugs for the treatment of
rare diseases, currently defined as diseases that affect fewer than 200,000 individuals in the United States, or for a disease that affects more than 200,000 individuals in the United States, where the sponsor does not realistically anticipate its
product becoming profitable. The FDA has granted Cinryze seven years of marketing exclusivity to Cinryze (C1 esterase inhibitor [human]) for routine prophylaxis in adolescent and adult patients with hereditary angioedema (HAE) pursuant to the Orphan
Drug Act. Lev originally received orphan drug designation for Cinryze by the Office of Orphan Products Development on July 16, 2004. Additionally, the FDA has granted maribavir orphan drug status for prevention of cytomegalovirus (CMV) viremia
and disease in the populations at-risk. Under the Orphan Drug Act, a manufacturer of a designated orphan product can seek certain tax benefits, and the holder of the first FDA approval of a designated orphan product will be granted a seven-year
period of marketing exclusivity for that product for the orphan indication. While the marketing exclusivity of an orphan drug would prevent other sponsors from obtaining approval of the same drug compound for the same indication unless the
subsequent sponsors could demonstrate clinical superiority or a market shortage occurs, it would not prevent other sponsors from obtaining approval of the same compound for other indications or the use of other types of drugs for the same use as the
orphan drug. The U.S. Congress has considered, and may consider in the future, legislation that would restrict the duration or scope of the market exclusivity of an orphan drug and, thus, we cannot be sure that the benefits of the existing statute
will remain in effect. Additionally, we cannot be sure that other governmental regulations applicable to our products will not change. We rely on the marketing exclusivity provided by the Orphan Drug Act for Cinryze as there are no core patents
protecting Cinryze.

Foreign Regulation

In addition to regulations in the United States, we are subject to a variety of foreign regulatory requirements governing human clinical trials and marketing approval for drugs. The foreign regulatory
approval process includes all of the risks associated with FDA approval set forth above, as well as additional country-specific



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regulations. Whether or not we obtain FDA approval for a product, we must obtain approval of a product by the comparable regulatory authorities of foreign countries before we can commence
clinical trials or marketing of the product in those countries. The approval process varies from country to country, and the time may be longer or shorter than that required for FDA approval. The requirements governing the conduct of clinical
trials, product licensing, pricing and reimbursement vary greatly from country to country.

For example, under European Union regulatory
systems, we may submit marketing authorizations either under a centralized or decentralized procedure. The centralized procedure provides for the grant of a single marketing authorization that is valid for all European Union member states. The
decentralized procedure provides for mutual recognition of national approval decisions, and the holder of a national marketing authorization may submit an application to the remaining member states. We submitted our Marketing Authorization
Application for Cinryze for the acute treatment and prophylaxis of HAE to the European Medicines Agency (EMA), using the centralized procedure.

Before submitting a Marketing Authorization Application (MAA) in the EU, a company must obtain approval of a Paediatric Investigation Plan (PIP) from the EMAs Paediatric Committee (PDCO). The PIP describes the pediatric development of
a product and may include pharmaceutical development, non-clinical and clinical activities. The PIP will also define the age ranges of the children for whom the product must be developed and the timelines that the sponsor must meet, including, for
example, the deferral of some studies. The PIP is updated as new information is obtained. The incentives for completing the PIP include 6 months patent extension and, for orphan medicinal products, an additional 2 years orphan exclusivity. In
October 2009 and March 2009 PIPs were approved for Cinryze and maribavir, respectively.

Legislation similar to the Orphan Drug Act has been
enacted in other countries outside of the United States, including the European Union. The orphan legislation in the European Union is available for therapies addressing conditions that affect five or fewer out of 10,000 persons. The market
exclusivity period is for ten years, although that period can be reduced to six years if, at the end of the fifth year, available evidence establishes that the product is sufficiently profitable not to justify maintenance of market exclusivity. In
October 2009 and December 2007, the Company was granted orphan medical product designation for Cinryze and maribavir, respectively, by the Committee for Orphan Medicinal Products of the EMA.

In some foreign countries, the proposed pricing for a drug must be approved before it may be lawfully marketed. The requirements governing drug pricing vary
widely from country to country. For example, the European Union provides options for its member states to restrict the range of medicinal products for which their national health insurance systems provide reimbursement and to control the prices
and/or reimbursement of medicinal products for human use. A member state may approve a specific price or level of reimbursement for the medicinal product, or it may instead adopt a system of direct or indirect controls on the profitability of the
company placing the medicinal product on the market. In the event we receive regulatory approval of Cinryze in the EU, we will need to engage with appropriate authorities on the operational, reimbursement, price approval and funding processes that
are separately required in each country.

Competition

Other companies are developing treatments for the disease states for which we market products or are developing product candidates, including compounds in
preclinical and clinical development for HAE, C. difficile, and CMV. These companies include both public and private entities, including well-known, large pharmaceutical companies, chemical companies, biotechnology companies and research
institutions. Our ability to compete successfully will be based on our ability to:



| |  |  | develop proprietary products;
| | - |  | -----------------------------



| |  |  | attract and retain scientific personnel;
| | - |  | ----------------------------------------



| |  |  | obtain patent or other protection for our products;
| | - |  | ---------------------------------------------------



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| |  |  | obtain required regulatory approvals; and
| | - |  | -----------------------------------------



| |  |  | manufacture and successfully market our products either alone or through outside parties.
| | - |  | -----------------------------------------------------------------------------------------

HAE

We do not have patent protection for the composition of Cinryze and we rely on the exclusivity provided by the Orphan Drug Act. The FDA granted Cinryze seven years of marketing exclusivity to Cinryze C1 inhibitor (human) for routine
prophylaxis of HAE pursuant to the Orphan Drug Act. Steroid based products are currently used for prophylaxis of HAE. In the fourth quarter of 2009 the FDA has granted marketing approval of CSL Behrings product, Berinert® C1-Esterase Inhibitor, Human, for the treatment of acute abdominal or facial attacks of hereditary angioedema and
Berinert has received exclusivity pursuant to the Orphan Drug Act. This approval will prevent us from obtaining FDA licensure and marketing our C1-INH product for the treatment of acute abdominal or facial attacks HAE for up to seven years.
Additionally, in the fourth quarter of 2009, Dyax received approval for their product candidate for the acute treatment of HAE. In addition, Pharming NV and Shire are currently developing products for the acute treatment of HAE.

CDI

The last core
patent protecting Vancocin expired in 1996. As a result, there is a potential for significant competition from generic versions of Vancocin. Such competition would result in a significant reduction in sales of Vancocin. We believe that regulatory
hurdles (notwithstanding the recent actions taken by the OGD, described below), as well as product manufacturing trade secrets, know-how and related non-patent intellectual property may impact market entry of generic competition. However, there can
be no assurance that these barriers will actually impact generic competition.

In December 2008, FDA changed OGDs 2006 bioequivalence
recommendation, which we have opposed since its original proposal in March 2006, by issuing draft guidance for establishing bioequivalence to Vancocin which would require generic products that have the same inactive ingredients in the same
quantities as Vancocin (Q1 and Q2 the same) to demonstrate bioequivalence through comparative in vitro dissolution testing. Under this latest proposed method, any generic product that is not Q1 and Q2 the same as Vancocin would need
to conduct an in vivo study with clinical endpoints to demonstrate bioequivalence with Vancocin.

On August 4, 2009 the FDAs
Pharmaceutical Science and Clinical Pharmacology Advisory Committee voted in favor of the OGDs 2008 draft guidelines on bioequivalence for Vancocin. If FDAs proposed bioequivalence method for Vancocin becomes effective, the time period
in which a generic competitor could be approved would be reduced and multiple generics may enter the market, which would materially impact our operating results, cash flows and possibly intangible asset valuations. This could also result in a
reduction to the useful life of the Vancocin-related intangible assets. Management currently believes there are no indicators that would require a change in useful life as management believes that Vancocin will continue to be utilized along with
generics that may enter the market, and the number of generics and the timing of their market entry is unknown.

Additionally, Optimer
Pharmaceuticals, Salix Pharmaceutical and Cubist Pharmaceuticals have clinical development programs with therapeutic agents for the treatment of C. difficileinfection that could be found to have competitive advantages over Vancocin. Approval
of new products, or expanded use of currently available products, to treat CDI, and particularly severe disease caused by C. difficile infection, could materially and adversely affect our sales of Vancocin. Vancocin sales for treatment of
antibiotic-associated pseudomembranous colitis caused by C. difficile have decreased over the past 12 months and Vancocins share of the U.S. market for this indication may continue to decrease due to competitive forces and market
dynamics. Metronidazole, a generic product, is regularly prescribed to treat CDI at costs which are substantially lower than for Vancocin. In addition, products which are currently marketed for other indications by other companies may also be
prescribed to treat this indication.



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CMV

Stem cell and solid organ transplant patients at risk for CMV infection or with active CMV disease are most likely to receive ganciclovir or valganciclovir (prodrug of ganciclovir), each of which were
developed and are marketed by F. Hoffmann-La Roche. Ganciclovir and valganciclovir are associated with the adverse effect of neutropenia, which may limit their use in certain patients. Foscarnet (AstraZeneca) and cidofvir (Gilead Sciences) may also
be used to treat active CMV infections in certain patient populations such as neutropenic patients, patients with ganciclovir-resistant CMV infection, or patients for whom ganciclovir is otherwise contraindicated. However, use of either foscarnet or
cidofovir is limited by the side effect of renal toxicity. Other broad-spectrum antiviral agents including valacyclovir and acyclovir (GSK) are marketed in several countries, and may also be used for the prevention of CMV infection in some patients.
We believe that there are a number of vaccine product in clinical trials for the prevention of CMV infection and other companies may have research and development programs with molecules active against CMV.

Business Development

We intend to continue to evaluate in-licensing or other opportunities to acquire products in development, or those that are currently on the market. We plan to seek products that treat serious or life threatening illnesses with a high unmet
medical need, require limited commercial infrastructure to market, and that provide both top and bottom line growth over time.

Many of our
competitors have substantially greater financial, research and development, manufacturing, marketing and human resources than we do.

Employees

As of February 19, 2010, we had 188 employees of which 169 were employed in the United States and 19
were located in Europe. A significant number of our management and professional employees have had prior experience with pharmaceutical, biotechnology or medical products companies. None of our employees are covered by collective bargaining
agreements. We believe that we have been successful in attracting skilled and experienced personnel; however, competition for such personnel is intense. We believe that our relations with our employees are good.

Executive Officers



|                        |  |     |  |                                                                          
|----------------------- |  | --- |  | -------------------------------------------------------------------------
|Name                    |  | Age |  | Position                                                                 
|Vincent J. Milano       |  | 46  |  | President, Chief Executive Officer and Chairman of the Board of Directors
|Charles A. Rowland, Jr. |  | 51  |  | Vice President, Chief Financial Officer                                  
|Colin Broom, M.D.       |  | 54  |  | Vice President, Chief Scientific Officer                                 
|Thomas F. Doyle         |  | 49  |  | Vice President, Strategic Initiatives                                    
|Daniel B. Soland        |  | 51  |  | Vice President, Chief Operating Officer                                  
|Robert G. Pietrusko     |  | 61  |  | Vice President, Regulatory Affairs and Quality                           
|J. Peter Wolf           |  | 40  |  | Vice President, General Counsel and Secretary                            
|Richard S. Morris       |  | 36  |  | Controller and Chief Accounting Officer                                  

Vincent J. Milano
joined the company in 1996, and has served as President and Chief Executive Officer since March 31, 2008. He became Chairman of the Board of Directors in December 2008. He served as our Chief Operating Officer from January 2006 to March 2008
and as Vice President, Chief Financial Officer of ViroPharma from November 1997 to March 2008. Mr. Milano has also previously served as our Vice President, Finance & Administration, as Treasurer, and as Executive Director,
Finance & Administration. Prior to joining ViroPharma, Mr. Milano was with KPMG LLP, independent certified public accountants, where he was a Senior Manager. Mr. Milano served on the board of directors of Verticalnet, Inc. from August
2003 until the company was acquired by BravoSolution S.p.A. in January 2008. Mr. Milano received his Bachelor of Science degree in Accounting from Rider College.



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Charles A. Rowland, Jr. has served as our Vice President, Chief Financial Officer since he joined the
company in October 2008. Prior to joining ViroPharma, Mr. Rowland served as Executive Vice President, Chief Financial Officer of Endo Pharmaceuticals from December 2006 to September 2008. Prior thereto, Mr. Rowland was Senior Vice
President and CFO of Biovail Pharmaceuticals, Inc. from 2004 to 2006. From 2001 to 2004, he was Chief Operating and Financial Officer for Breakaway Technologies, a management consulting company. His pharmaceutical industry career includes positions
of increasing scope and responsibility at Pharmacia Corp., where he had global responsibility for Finance and Information Technology for the Pharmaceutical Business and financial responsibility for the Global Supply organization as Vice President,
Finance Global Supply and VP Finance & IT-Global Pharma Ops; Novartis Pharmaceuticals Corp., where he was Vice President, Planning and Decision Support, and Bristol-Myers Squibb, where he served as Director of Finance. Mr. Rowland
received his Bachelor of Science degree in Accounting from St. Josephs University and a MBA from Rutgers University.

Colin Broom, M.D.
has served as Vice President, Chief Scientific Officer of ViroPharma since May 2004. From 2000 until 2003, Dr. Broom served as Vice President of Clinical Development and Medical Affairs, Europe, for Amgen. From 1998 to 1999, Dr. Broom
served as Senior Vice President of Global Clinical Development for Hoechst Marion Roussel, now Sanofi-Aventis. From 1984 until 1998, Dr. Broom was with Glaxo and then SmithKline Beecham, where he held positions of increasing seniority in
clinical pharmacology in Europe before moving to the U.S. to head global oncology and subsequently becoming Vice President of CNS/GI. Dr. Broom holds a Bachelor of Science degree in Pharmacology from University College London, and a Bachelor of
Medicine and Bachelor of Surgery degree from St. Georges Hospital Medical School. Dr. Broom is a Member of the Royal College of Physicians and a Fellow of the Faculty of Pharmaceutical Medicine of the UK Colleges of Physicians. Dr. Broom
has been a director of NPS Pharmaceuticals since July 2009.

Thomas F. Doyle is Vice President, Strategic Initiatives as of January 2008.
Mr. Doyle previously served as Vice President, General Counsel of ViroPharma from November 1997 to January 2008, as Secretary from February 1997 to January 2008 and as Executive Director, Counsel since joining ViroPharma in November 1996 to
February 1997. From 1990 until 1996, Mr. Doyle was a corporate attorney with the law firm of Pepper Hamilton LLP. Mr. Doyle received his J.D. from Temple University School of Law. Prior to attending Temple University, Mr. Doyle was a
Certified Public Accountant. Mr. Doyle received his Bachelor of Science degree in Accounting from Mt. St. Marys College.

Daniel B.
Soland joined ViroPharma in November 2006 as our Vice President, Chief Commercial Officer and has served as our Chief Operating Officer since March 2008. From February 2005 until June 2006, Mr. Soland served as President of Chiron
Vaccines. From March 2003 until February 2005, Mr. Soland was President and Chief Executive Officer at Epigenesis Pharmaceuticals, a privately held biopharmaceutical company. Prior to that, Mr. Soland spent nine years with GlaxoSmithKline
as the Vice President and Director of Worldwide Marketing Operations, and five years as GSKs Vice President and Director of the U.S. Vaccines Business Unit. Mr. Soland holds a Bachelor of Science degree in Pharmacy from the University of
Iowa, in Iowa City, IA.

Robert G. Pietrusko, Phrm.D., has served as Vice President, Global Regulatory Affairs and Quality since joining
ViroPharma in 2007. Prior to joining ViroPharma, Dr. Pietrusko served as Senior Vice President of Worldwide Regulatory Affairs for Millennium Pharmaceuticals, Inc. from 2001 through May 2007. Dr. Pietrusko spent 19 years at
GlaxoSmithKline, culminating in his tenure as Vice President and Director, Anti-infective and Antiviral Therapeutic Areas, U.S. Regulatory Affairs Dr. Pietrusko holds a Bachelor of Science degree in Biology and a Bachelors of Pharmacy degree
from Rutgers University, and a Doctor of Pharmacy degree from the Philadelphia College of Pharmacy and Science.

J. Peter Wolf has served as
Vice President, General Counsel, and Secretary since January 1, 2008. Mr. Wolf previously served as Associate General Counsel of ViroPharma since 2004. From 2000 to 2004 Mr. Wolf was a corporate attorney with the law firm of Pepper
Hamilton LLP and as an associate at two other private law firms. Mr. Wolf received his J.D. from the George Washington University National Law Center and his Bachelor of Arts from the University of Delaware.



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Richard S. Morris, CPA has served as Chief Accounting Officer of ViroPharma since April 2008. From December
2001 until April 2008, Mr. Morris has served in increasing levels of responsibility at ViroPharma, most recently as Controller from January of 2005 through April 2008. Prior to joining ViroPharma, Mr. Morris worked for KPMG LLP in their
Healthcare Assurance practice. Mr. Morris holds a bachelors degree in Accounting from Saint Josephs University and has been a CPA since 1999.

Available Information

Our Internet website is www.viropharma.com and you may find our SEC
filings on the Investors tab of that website. We provide access to all of our filings with the SEC, free of charge, as soon as reasonably practicable after filing with the SEC on such site. Our Internet website and the information
contained on that website, or accessible from our website, is not intended to be incorporated into this Annual Report on Form 10-K or any other filings we make with the SEC.



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PART IIOTHER INFORMATION



|ITEM 1A. | RISK FACTORS
|-------- | ------------

We
have historically depended heavily on the continued sales of Vancocin.

If revenue from Vancocin materially declines, our financial
condition and results of operations will be materially harmed because sales of Vancocin represented 69 percent of our revenue in 2009. In addition, to the extent that revenue from Vancocin materially declines prior to Cinryze achieving significant
commercial success, our financial condition and results of operations may be further harmed because sales of Cinryze may be our only other material source of revenue for at least the next several years.

Vancocin product sales could be adversely affected by a number of factors, including:



| |  |  | the development and approval of competitive generic versions of oral Vancocin, approval of products which are currently marketed for other indications
by other companies or new pharmaceuticals and technological advances to treat the conditions addressed by Vancocin;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | manufacturing or supply interruptions which could impair our ability to acquire an adequate supply of Vancocin to meet demand for the product;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | changes in the prescribing or procedural practices of physicians in the areas of infectious disease, gastroenterology and internal medicine, including
off-label prescribing of other products;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | decreases in the rate of infections for which Vancocin is prescribed;
| | - |  | ---------------------------------------------------------------------



| |  |  | the level and effectiveness of our sales and marketing efforts;
| | - |  | ---------------------------------------------------------------



| |  |  | decrease in the sensitivity of the relevant bacterium to Vancocin;
| | - |  | ------------------------------------------------------------------



| |  |  | changes in terms required by wholesalers, including fee-for-service contracts;
| | - |  | --------------------------------------------------------------------------------



| |  |  | marketing or pricing actions by one or more of our competitors;
| | - |  | ---------------------------------------------------------------



| |  |  | our ability to maintain all necessary contracts or obtain all necessary rights under applicable federal and state rules and regulations;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the approval of legislative proposals that would authorize re-importation of Vancocin into the U.S. from other countries;
| | - |  | -------------------------------------------------------------------------------------------------------------------------



| |  |  | regulatory action by the FDA and other government regulatory agencies;
| | - |  | ----------------------------------------------------------------------



| |  |  | changes in the reimbursement or substitution policies of third-party payors or retail pharmacies; and
| | - |  | -----------------------------------------------------------------------------------------------------



| |  |  | product liability claims.
| | - |  | -------------------------

Revenues from the sale of Vancocin may not remain at or above current levels or achieve the level of net product sales that we expect. We believe the rate of infections for which Vancocin is prescribed decreased during the second half of
2007 and remained flat or declined during 2008 and 2009. A decrease in sales of Vancocin could have a material adverse effect on our business, financial condition, results of operations and liquidity.

If we are unable to continue to successfully commercialize Cinryze in the United States, or are delayed in our ability to
commercialize Cinryze in Europe and additional territories or are significantly limited in doing so, our business will be materially harmed.

The FDA approved Cinryze for routine prophylaxis against angioedema attacks in adolescent and adult patients with hereditary angioedema on October 10, 2008. Cinryze became commercially available for routine prophylaxis against HAE in
December 2008. We are in the process of seeking regulatory approval for Cinryze in Europe and anticipate that our Marketing Authorization Application (MAA) will be accepted by the European Medicines Agency (EMEA)in the first half of
2010. The commercial success of Cinryze will depend on several factors, including the following:



| |  |  | the number of patients with HAE that may be treated with Cinryze;
| | - |  | -----------------------------------------------------------------



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| |  |  | our ability to receive regulatory approvals to market Cinryze in Europe and other territories in the timeframes we anticipate;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------



| |  |  | manufacturing or supply interruptions which could impair our ability to acquire an adequate supply of Cinryze to meet demand for the product;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | acceptance by physicians and patients of Cinryze as a safe and effective treatment;
| | - |  | -----------------------------------------------------------------------------------



| |  |  | our ability to effectively market and distribute Cinryze in the United States, Europe and additional territories;
| | - |  | -----------------------------------------------------------------------------------------------------------------



| |  |  | cost effectiveness of HAE treatment using Cinryze;
| | - |  | --------------------------------------------------



| |  |  | relative convenience and ease of administration of Cinryze;
| | - |  | -----------------------------------------------------------



| |  |  | potential advantages of Cinryze over alternative treatments;
| | - |  | ------------------------------------------------------------



| |  |  | the timing of the approval of competitive products including another C1 esterase inhibitor for the acute treatment of HAE;
| | - |  | --------------------------------------------------------------------------------------------------------------------------



| |  |  | patients ability to obtain sufficient coverage or reimbursement by third-party payors in the U.S. and our ability to receive sufficient
reimbursement and price approvals that are separately required in each country of Europe; and
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | sufficient supply and reasonable pricing of raw materials necessary to manufacture Cinryze.
| | - |  | -------------------------------------------------------------------------------------------

If we are not able to continue to successfully commercialize Cinryze in the U.S., Europe and additional territories, or are significantly delayed or limited
in doing so, we could fail to maintain profitability and our financial condition, results of operations and liquidity will be materially adversely impacted.

Because the target patient population for Cinryze is small and has not been definitively determined, we must be able to successfully identify HAE patients and maintain a significant market share in
order to increase revenue and maintain profitability.

The prevalence of HAE patients has not been definitively determined but has been
estimated, through market research we have conducted, at up to 11,000 total patients in the U.S. Additionally, we believe that HAE affects between 1 in 10,000 and 1 in 50,000 individuals in Europe and other territories worldwide. There can be no
guarantee that any of our programs will be effective at identifying HAE patients and the number of HAE patients in the U.S. or other territories may turn out to be lower than expected or such patients may not be amenable to treatment with Cinryze.
Accordingly, our product sales of Cinryze and overall business could be adversely affected if we are unable to identify additional HAE patients to increase revenue and maintain profitability.

Our core patent protection for Vancocin has expired, which could result in significant competition from generic products and lead to a
significant reduction in sales of Vancocin.

The last core patent protecting Vancocin expired in 1996. As a result, there is a
potential for significant competition from generic products that treat the same conditions addressed by Vancocin. Such competition could result in a significant reduction in sales of Vancocin. We believe that regulatory hurdles (notwithstanding the
recent actions taken by the FDAs Office of Generic Drugs, Center for Drug Evaluation and Research (OGD), which are described in more detail below and which we are vigorously opposing), as well as product manufacturing trade secrets, know-how
and related non-patent intellectual property, may present barriers to market entry of generic competition. However, these barriers may not actually delay or prevent generic competition. The effectiveness of these non-patent-related barriers to
competition will depend primarily upon:



| |  |  | the current or future regulatory approval requirements for any generic applicant;
| | - |  | ---------------------------------------------------------------------------------



| |  |  | the complexities of the manufacturing process for a competitive product;
| | - |  | ------------------------------------------------------------------------



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| |  |  | the nature of the market which Vancocin serves and the position of Vancocin in the market from time to time;
| | - |  | ------------------------------------------------------------------------------------------------------------



| |  |  | the growth of the market which Vancocin serves; and
| | - |  | ---------------------------------------------------



| |  |  | our ability to protect Vancocin know-how as a trade secret.
| | - |  | -----------------------------------------------------------

Generic competitors may take advantage of the absence of patent protection for Vancocin to attempt to develop a competing product. We have become aware of information suggesting that other potential
competitors are attempting to develop a competing generic product. For example, multiple generic manufacturers have publicly stated that they have filed to receive product approval and commence a marketing launch of a generic version of oral
Vancocin. We are not able to predict the time period in which a generic drug may enter the market, as this timing will be affected by a number of factors, including:



| |  |  | whether an in-vitro method of demonstrating bioequivalence is available to an applicant to gain marketing approval by the FDA in lieu of performing
clinical studies;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the nature of any clinical trials which are required, if any;
| | - |  | -------------------------------------------------------------



| |  |  | the timing of filing an Abbreviated New Drug Application, or an ANDA, the amount of time required by the FDA to review the ANDA and whether a
generic drug application is afforded an accelerated review by the FDA;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the specific formulation of drug for which approval is being sought; and
| | - |  | ------------------------------------------------------------------------



| |  |  | the time required to develop appropriate manufacturing procedures.
| | - |  | ------------------------------------------------------------------

On March 17, 2006, we learned that the OGD changed its approach regarding the conditions that must be met in order for a generic drug applicant to request a waiver of in-vivo bioequivalence testing
for vancomycin hydrochloride capsules. Specifically, we were informed that a generic applicant may be able to request such a waiver provided that dissolution testing demonstrates that the test product is rapidly dissolving at certain specified
conditions. This deviated from our understanding of OGDs historical practices which would require, for a poorly-absorbed, locally acting gastrointestinal drug (such as Vancocin) a demonstration of bioequivalence through clinical studies or a
demonstration of bioequivalence using an appropriately validated in-vitro methodology.

On March 17, 2006, we filed a Petition for Stay
of Action with the FDA regarding the requirements for waivers of in-vivo bioequivalence testing for Vancocin, and we have amended that petition several times through additional filings in support of our opposition to any approach that does not
require rigorous scientific methods to demonstrate a rate and extent of drug release to the site of action consistent with good medicine and science.

In December 2008, the FDA changed OGDs 2006 bioequivalence recommendation by issuing draft guidance for establishing bioequivalence to Vancocin which would require generic products that have the same inactive ingredients in the same
quantities as Vancocin, or Q1 and Q2 the same, to demonstrate bioequivalence through comparative dissolution testing. Under this latest proposed method, any generic product that is not Q1 and Q2 the same as Vancocin would need to conduct an in
vivo study with clinical endpoints to demonstrate bioequivalence with Vancocin.

The FDA convened a meeting of its Advisory Committee for
Pharmaceutical Science and Clinical Pharmacology to discuss bioequivalence recommendations for oral vancomycin hydrochloride capsule drug products on August 4, 2009. The Advisory Committee was asked if the proposed guidelines are sufficient for
establishing bioequivalence for generic vancomycin oral capsules. The Advisory Committee voted unanimously in favor of the component of the proposed OGD recommendation that requires bioequivalence to be demonstrated through comparable dissolution in
media of pH 1.2, 4.5 and 6.8 for potential vancomycin HCl capsule generic products



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that (a) contain the same active and inactive ingredients in the same amounts as Vancocin HCl capsules; (b) meet currently accepted standards for assay, potency, purity, and stability
(equivalent to those in place for Vancocin HCl capsules); and (c) are manufactured according to cGMP.

We have opposed both the substance
of the FDAs bioequivalence method and the manner in which it was developed. In the event the OGDs revised approach regarding the conditions that must be met in order for a generic drug applicant to request a waiver of in-vivo
bioequivalence testing for Vancocin remains in effect, the time period in which a generic competitor may enter the market would be reduced. There can be no assurance that the FDA will agree with the positions stated in our Vancocin related
submissions or that our efforts to oppose the OGDs March 2006 and December 2008 recommendation to determine bioequivalence to Vancocin through in-vitro dissolution testing will be successful. We cannot predict the timeframe in which the FDA
will make a decision regarding either our citizen petition for Vancocin or the approval of generic versions of Vancocin. If we are unable to change the recommendation set forth by the OGD in March 2006 as revised in December 2008 and voted upon by
the Advisory Committee for Pharmaceutical Science and Clinical Pharmacology, the threat of generic competition will be high.

We do not have patent protection for the composition of Cinryze and we rely on the exclusivity provided by the Orphan Drug Act.

The Orphan Drug Act was created to encourage companies to develop therapies for rare diseases by providing incentives for drug development and commercialization. One of the incentives provided by the act
is seven years of market exclusivity for the first product in a class licensed for the treatment of a rare disease. HAE is considered to be a rare disease under the Orphan Drug Act, and companies may obtain orphan drug status for therapies that are
developed for this indication. The FDA granted Cinryze seven years of marketing exclusivity to Cinryze C1 inhibitor (human) for routine prophylaxis of HAE pursuant to the Orphan Drug Act. The FDA has granted marketing approval of CSL Behrings
product, Berinert® C1-Esterase Inhibitor, Human, for the treatment of acute abdominal or facial attacks of
hereditary angioedema and Berinert has received exclusivity pursuant to the Orphan Drug Act. In addition, the EMEA has enacted similar orphan drug legislation and we have received an orphan drug designation under this legislation for Cinryze. We
believe Pharming NV is currently developing products that the EMEA may determine to be in the same class as Cinryze for the acute treatment of HAE in Europe.

While the marketing exclusivity of an orphan drug would prevent other sponsors from obtaining approval of the same drug compound for the same indication unless the subsequent sponsors could demonstrate
clinical superiority or a market shortage occurs, it would not prevent other sponsors from obtaining approval of the same compound for other indications or the use of other types of drugs for the same use as the orphan drug. In the event we are
unable to fill demand for Cinryze, it is possible that the FDA may view such unmet demand as a market shortage which could impact the market exclusivity provided by the Orphan Drug Act. Additionally, the U.S. Congress has considered, and may
consider in the future, legislation that would restrict the duration or scope of the market exclusivity of an orphan drug and, thus, we cannot be sure that the benefits of the existing statute will remain in effect.

We do not know whether Vancocin and Cinryze will continue to be competitive in the markets which they serve.

We currently generate revenues from sales of Vancocin in the U.S. for the treatment of antibiotic-associated pseudomembranous colitis caused by
Clostridium difficile infection, or CDI or C. difficile, and enterocolitis caused by S. aureus, including methicillin-resistant strains. Vancocin sales for treatment of antibiotic-associated pseudomembranous colitis caused by C.
difficile decreased in 2009 from the sales achieved in 2008. Vancocins share of the U.S. market for this indication may decrease further due to competitive forces and market dynamics, including an increase in the oral use of intravenous
vancomycin. Metronidazole, a generic product, is regularly prescribed to treat CDI at costs which are substantially lower than for Vancocin. In addition, products which are



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currently marketed for other indications by other companies may also be prescribed to treat this indication. Other drugs that are in development by our competitors, including Salix
Pharmaceuticals and Optimer Pharmaceuticals, could be found to have competitive advantages over Vancocin. Approval of new products, or expanded use of currently available products, to treat CDI, and particularly severe disease caused by CDI, could
materially and adversely affect our sales of Vancocin.

The FDA approved Cinryze for routine prophylaxis against angioedema attacks in
adolescent and adult patients with hereditary angioedema on October 10, 2008 and Cinryze became commercially available for prophylaxis against HAE in December 2009. While we are not aware of other companies which are developing a product for
the prophylaxis of HAE in the U.S., CSL Behring and Dyax had products approved for the treatment of acute attacks of HAE during 2009 and steroid based products are currently used for prophylaxis of HAE. In addition, Pharming NV and Jerini/Shire are
currently developing products for the acute treatment of HAE. Approval of new products, or expanded use of currently available products, to prophylax or treat HAE, could materially and adversely affect our U.S. sales of Cinryze. In addition, there
are currently several products approved for the acute treatment of HAE in Europe. Even if we are successful in receiving regulatory approval for Cinryze in Europe there can be no assurance that we will be able to achieve market share in accordance
with our expectations.

We currently depend, and will in the future continue to depend, on third parties to manufacture
raw, intermediate and finished goods for Vancocin, Cinryze and our product candidates. If these manufacturers fail to meet our requirements and the requirements of regulatory authorities, our future revenues may be materially adversely affected.

We do not have the internal capability to manufacture quantities of pharmaceutical products to supply our clinical or commercial needs
under the current Good Manufacturing Practice regulations, or cGMPs required by the FDA and other regulatory agencies. In order to continue to develop products, apply for regulatory approvals and commercialize our products, we will need to contract
with third parties that have, or otherwise develop, the necessary manufacturing capabilities.

There are a limited number of manufacturers
that operate under cGMPs that are capable of manufacturing our products and product candidates. As such, if we are unable to enter into supply and processing contracts with any of these manufacturers or processors for our development stage product
candidates, there may be additional costs and delays in the development and commercialization of these product candidates. For example, Cinryze is a biologic which requires processing steps that are more difficult than those required for most
chemical pharmaceuticals and therefore the third party contracts must have additional technical skills and multiple steps to attempt to control the manufacturing processes.

Problems with these manufacturing processes such as equipment malfunctions, facility contamination, labor problems, raw material shortages or contamination, natural disasters, power outages, terrorist
activities, or disruptions in the operations of our suppliers and even minor deviations from the normal process, could result in product defects or manufacturing failures that result in lot failures, product recalls, product liability claims and
insufficient inventory.

If we are required to find an additional or alternative source of supply, there may be additional costs and delays in
the development or commercialization of our product candidates. Additionally, the FDA and other regulatory agencies routinely inspect manufacturing facilities before approving a new drug application, or NDA, or biologic application, or BLA, for a
drug or biologic manufactured at those sites. If any of our manufacturers or processors fails to satisfy regulatory requirements, the approval and eventual commercialization of our products and product candidates may be delayed.

In addition, regulatory agencies subject a marketed therapy, its manufacturer and the manufacturers facilities to continual review and periodic
inspections. The discovery of previously unknown problems with a therapy or the facility or process used to produce the therapy could prompt a regulatory authority to impose restrictions on us or



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delay approvals for new products or could cause us to voluntarily adopt restrictions, including withdrawal of one or more of our products or services from the market. The FDA recently inspected
two sites maintained by our contract manufacturer for Cinryze and issued a notice of observations at the close of the inspection on FDA Form 483 for each site. The observations at one site were subsequently remedied and a notice to this effect was
issued by the FDA. Responses to the observations made at the second site have been provided to the FDA. If any of our manufacturers or processors fails to satisfy regulatory requirements, operations at such facility may be halted which could result
in our inability to supply product to patients and reduce our revenues.

All of our contract manufacturers must comply with the applicable
cGMPs, which include quality control and quality assurance requirements as well as the corresponding maintenance of records and documentation. If our contract manufacturers do not comply with the applicable cGMPs and other FDA regulatory
requirements, we may be subject to product liability claims, the availability of marketed products for sale could be reduced, our product commercialization could be delayed or subject to restrictions, we may be unable to meet demand for our products
and may lose potential revenue and we could suffer delays in the progress of clinical trials for products under development. We do not have control over our third-party manufacturers compliance with these regulations and standards. Moreover,
while we may choose to manufacture products in the future, we have no experience in the manufacture of pharmaceutical products for clinical trials or commercial purposes. If we decide to manufacture products, we would be subject to the regulatory
requirements described above. In addition, we would require substantial additional capital and would be subject to delays or difficulties encountered in manufacturing pharmaceutical products. No matter who manufactures the product, we will be
subject to continuing obligations regarding the submission of safety reports and other post-market information.

We
depend on single manufacturers for certain components used in Vancocin and Cinryze and the loss of either of these suppliers or any supplier in general would have a negative impact on our operations.

We rely on a single supplier of vancomycin, the active pharmaceutical ingredient (API) of Vancocin and also rely on a single manufacturer of Vancocin
capsules. Our third party API supplier and finished product supplier are the only manufacturers qualified by the FDA to manufacture API and Vancocin capsule finished product for distribution and sale in the U.S. We are therefore dependent upon these
suppliers and attempt to maintain Vancocin inventory levels to meet our current projections, plus a reasonable stock in excess of those projections.

We rely on a single manufacturer of Cinryze. Pursuant to our distribution agreement, Sanquin Blood Supply Foundation will supply us with certain annual minimum and maximum amounts of CINRYZE. We and Sanquin are undertaking process
improvements and facility expansions to increase the capacity of the facilities involved in manufacturing Cinryze. In the event that certain events occur which result in Sanquin permanently ceasing to manufacture Cinryze, Sanquin will grant us a
perpetual license under its intellectual property related to the Product and assign to us each of the agreements with such third party manufacturers. In consideration thereof, we will pay a one-time fee to Sanquin as well as a royalty on future
sales of products. In the event demand for Cinryze is greater than the amount supplied by Sanquin, we will not be able to meet such demand as there are no other sources of supply of Cinryze available to us. In the event Sanquin permanently ceases to
manufacture Cinryze, we will need to find an alternate manufacturer of Cinryze. Currently, to our knowledge, there is only one other commercial supplier of C1 esterase inhibitor and that supplier has recently received marketing approval for their
product in the U.S. Accordingly, in the event Sanquin permanently ceases to manufacture Cinryze, we cannot be certain that we would be able to locate another willing supplier for our product on the terms we require.

The risks associated with the numerous factors that could cause interruptions in the supply of our products, including manufacturing capacity limitations,
regulatory reviews, changes in our sources for manufacturing, disputes with a manufacturer, our failure to timely locate and obtain replacement manufacturers as needed and conditions affecting the cost and availability of raw materials, are
magnified when the suppliers are limited in number. Any interruption in the supply of finished products could hinder our ability to timely distribute our products and satisfy customer demand. If we are unable to obtain adequate product supplies to
satisfy our



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customers orders, we may lose those orders, our customers may cancel other orders, and they may choose instead to stock and purchase competing products. This in turn could cause a loss of
our market share and negatively affect our revenues. Supply interruptions may occur and our inventory may not always be adequate.

During time periods that patient demand approaches our manufacturing capacity we will manage the rate at which additional new patients will receive Cinryze and will limit the number of doses provided to patients. This would result in
a reduction of potential future revenues.

Pursuant to our distribution agreement, Sanquin Blood Supply Foundation supplies us with
certain annual minimum and maximum amounts of C1 INH. We and Sanquin are undertaking process improvements and facility expansions to increase the capacity of the facilities involved in manufacturing Cinryze. Our manufacturing scale up effort is a
two-tiered approach including a parallel chromatography process, which we anticipate will be completed in the first quarter of 2010, with the additional product becoming available for commercial sale in the second quarter of 2010. The second phase
of our scale up plan involves a larger scale construction project to significantly increase the production facilities of Sanquin. Pursuant to an agreement with Sanquin we have financed a portion of the costs of the project to increase the
manufacturing capacity of its facilities. Following the completion of construction, Sanquin would need to obtain the requisite regulatory approvals for the facility on a timely basis in order to manufacture Cinryze for us at an increased capacity.
We anticipate that the approvals could be received by the end of 2010.

The number of patients enrolling into our treatment support service
for patients with HAE and their healthcare providers, CinryzeSolutions is above our expectations. As a result, we began to temporarily limit the rate at which additional patients are started on drug to ensure that those already receiving
commercial drug continue with a supply of Cinryze until capacity increases. If the manufacturing capacity expansion projects at Sanquin are delayed, or do not result in the capacity we anticipate, or if Sanquin cannot obtain necessary regulatory
approvals for the contemplated facility expansions in the time frames we anticipate, we may not be able to satisfy patient demand. Our inability to obtain adequate product supplies to satisfy our patient demand may create opportunities for our
competitors and we will suffer a loss of potential future revenues.

The distribution of our commercial products is
dependent upon a limited number of third party service providers and disruptions in these relationships could result in our failure to achieve the sales of our products that we expected.

We rely on a single third party to provide all necessary distribution and logistics services with respect to our sales of Vancocin and Cinryze, including
warehousing of finished product, accounts receivable management, billing, collection and recordkeeping. The third party logistics service provider stores and distributes Vancocin from two warehouses located in the central U.S. and western U.S. and
Cinryze from one of these warehouses. A disaster occurring at or near these facilities could materially and adversely impact our ability to supply Vancocin and Cinryze to our distribution partners, which would result in a reduction in revenues from
sales.

Approximately 94 percent of our Vancocin sales are to the three largest pharmaceutical wholesalers. If any of these wholesalers
ceases to purchase our product for any reason, then unless and until the remaining wholesalers increase their purchases of Vancocin or alternative distribution channels are established:



| |  |  | our commercial operations could be significantly disrupted;
| | - |  | -----------------------------------------------------------



| |  |  | the availability of our products to patients could be disrupted; and
| | - |  | --------------------------------------------------------------------



| |  |  | we may not achieve the sales of our products that we expected, which could decrease our revenues and potentially affect our ability to maintain
profitability.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------

Additionally, we do not require collateral from our wholesalers but rather maintain credit limits and as a
result we have an exposure to credit risk in our accounts receivable. The highest account receivable during 2009 we experienced from any one wholesaler was approximately $12.9 million and we anticipate that this amount could



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increase if Vancocin sales increase. While we have experienced prompt payment by wholesalers and have not had any defaults on payments owed, a default by a large wholesaler could have a material
adverse effect on our earnings and cash position.

We have entered into agreements with two specialty distributors / specialty pharmacies that
distribute Cinryze to physicians, hospitals, pharmacies, home health providers and patients. We also entered into an agreement with a single service provider who will provide patient support services including benefit coverage investigations,
assistance with prior authorizations, appeals assistance, and broad based reimbursement assistance.

If our third party service providers
cease to be able to provide us with these services, or do not provide these services in a timely or professional manner, it could significantly disrupt our commercial operations, and may result in our not achieving the sales of Vancocin and Cinryze
that we expected. Additionally, any interruption to these services could cause a delay in delivering product to our customers, which could have a material adverse effect on our business.

If we are unable to obtain reimbursement for Cinryze from government health administration authorities, private health insurers and
other organizations, Cinryze may be too costly for regular use and our ability to generate revenues would be harmed.

Our future
revenues and profitability will be adversely affected if governmental, private third-party payors and other third-party payors, including Medicare and Medicaid, do not sufficiently defray the cost of Cinryze to the consumer. If these entities do not
provide coverage and reimbursement for Cinryze or determine to provide an insufficient level of coverage and reimbursement, Cinryze may be too costly for general use, and physicians may not prescribe it. Cinryze is significantly more expensive than
traditional drug treatments. Many third-party payors cover only selected drugs, making drugs that are not preferred by such payor more expensive for patients, and often require prior authorization or failure on another type of treatment before
covering a particular drug. Third-party payors may be especially likely to impose these obstacles to coverage for higher-priced drugs such as Cinryze.

In addition to potential restrictions on coverage, the amount of reimbursement for our products may also reduce our profitability and worsen our financial condition. In the United States and elsewhere, there have been, and we expect there
will continue to be, actions and proposals to control and reduce healthcare costs. Government and other third-party payors are challenging the prices charged for healthcare products and increasingly limiting and attempting to limit both coverage and
level of reimbursement for prescription drugs.

Because Cinryze is too expensive for most patients to afford without sufficient health
insurance coverage, if adequate coverage and reimbursement by third-party payors is not available, our ability to successfully commercialize Cinryze may be adversely impacted. Any limitation on the use of Cinryze or any decrease in the price of
Cinryze will have a material adverse effect on our business.

Even where patients have access to insurance, their insurance co-payment amounts
may be too expensive for them to afford. We intend to financially support the HAE financial assistance programs established by Patient Services Incorporated (PSI), which, among other things, assists patients in acquiring drugs such as Cinryze.
Organizations such as PSI assist patients who have no insurance coverage for drugs locate insurance and also provide financial assistance to patients whose insurance coverage leaves them with prohibitive co-payment amounts or other expensive
financial obligations. In addition to assistance from organizations such as PSI, we anticipate that we will provide Cinryze without charge for related charitable purposes. We are not able to predict the financial impact of the support we may provide
for these and other charitable purposes; however, substantial support could have a material adverse effect on our ability to maintain profitability.

In furtherance of our efforts to facilitate access to Cinryze, we have contracted with a third party to provide the CinryzeSolutions program, a treatment support service for patients with HAE and their healthcare providers.
CinryzeSolutions personnel will provide education about HAE and Cinryze and help facilitate solutions for



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reimbursement, coverage and access. Although case managers will assist patients and healthcare providers in locating and accessing Cinryze, we cannot guarantee a sufficient level of coverage,
reimbursement or financial assistance.

If supplies of U.S. human plasma are interrupted or if we are unable to acquire
adequate supplies of U.S. human plasma to meet demand for Cinryze, our ability to maintain inventory levels could suffer and future revenues may be delayed or reduced.

We have relied exclusively and are dependent on certain third party sources to supply U.S. human plasma for Cinryze. In connection with our commercial sales of Cinryze and our ongoing and future clinical
trials, we will need increased supplies of plasma.

We have a contract for the purchase and sale of plasma with DCI Management Group, LLC,
pursuant to which we purchase specified quantities of U.S. source plasma. Under this agreement, DCI agreed to sell us specified annual quantities of plasma in accordance with applicable good manufacturing practices. We have also made periodic spot
purchases of plasma.

Plasma markets have historically been subject to price fluctuations as a result of changes in the production capacity
available in the industry, the availability and pricing of plasma, development of competing products and the availability of alternative therapies. In recent years, there has been consolidation in the industry as several plasma derivatives
manufacturers have acquired plasma collectors and reduced capacity. As a result, it could be difficult to resolve any significant disruption in the supply of plasma. In addition, concern over the safety of blood products (which has led to increased
domestic and foreign regulatory control over the collection and testing of plasma and the disqualification of certain segments of the population from the donor pool), have reduced the potential donor pool.

If we are unable to obtain or maintain the level of plasma supply we require, we will need to obtain our supply from other parties in order to satisfy our
expected needs. Establishing additional or replacement suppliers for plasma may take a substantial amount of time. In addition, we may have difficulty obtaining similar supplies from other suppliers that are acceptable to the FDA. If we have to
switch to a replacement supplier, we may face additional regulatory delays and the manufacture and delivery of Cinryze could be interrupted for an extended period of time, which may decrease sales of Cinryze or result in increased costs.

Cinryze is derived from human plasma, and is therefore subject to the risk of biological contamination inherent in plasma-derived
products. This risk could adversely affect our ability to obtain raw materials and market our products.

Cinryze is derived from
donated human plasma. Many disease-causing viruses, bacteria and other pathogens are present in the plasma of infected individuals. If infected individuals donate plasma, the plasma would likely contain those pathogens. As a result, the sourcing of
plasma, and the production of products derived from plasma, is regulated extensively by the FDA and other medical product and health care regulatory agencies. We rely on our suppliers to maintain compliance with the regulations promulgated by such
agencies. The failure to comply with these regulations or the accidental contamination of plasma could adversely affect our ability to source plasma at commercially reasonable prices. Moreover, public perception about the safety of plasma-derived
products could adversely affect the market for our products. Concern over the safety of plasma-derived products, driven in part by past screening failures in the industry and the appearance of infectious agents like HIV, has resulted in the adoption
of rigorous screening procedures by regulatory authorities, and screening procedures are likely to become stricter and more complex over time. As screening procedures have become more rigorous, potential donors have been disqualified and other
potential donors have been discouraged from donating due to their reluctance to undergo the required screening procedures. Increasingly stringent measures could adversely affect plasma supplies, with a corresponding adverse effect on our ability to
obtain raw materials at a commercially acceptable price, or at all. The safety concerns associated with plasma-derived products also affect



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our ability to market our products. Medical events or studies that raise or substantiate concerns about the safety of our or other similar products would negatively impact public perception of
all plasma-derived products and of the plasma donation process. Further, any failure in screening, whether by us or by other manufacturers of these products, could adversely affect our reputation, the support we receive from the medical community
and overall demand for our products.

We may be subject to product liability claims, which can be expensive, difficult
to defend and may result in large judgments or settlements against us.

The administration of drugs or biologics to humans, whether in
clinical trials or after marketing clearance is obtained, can result in product liability claims. Product liability claims can be expensive, difficult to defend and may result in large judgments or settlements against us. In addition, third party
collaborators and licensees may not protect us from product liability claims.

We currently maintain product liability insurance in connection
with our clinical development programs and marketing of Vancocin and Cinryze. We may not be able to obtain or maintain adequate protection against potential liabilities arising from clinical development or product sales. If we are unable to obtain
sufficient levels of insurance at acceptable cost or otherwise protect against potential product liability claims, we will be exposed to product liability claims. A successful product liability claim in excess of our insurance coverage could harm
our financial condition, results of operations, liquidity and prevent or interfere with our product commercialization efforts. In addition, any successful claim may prevent us from obtaining adequate product liability insurance in the future
on commercially desirable terms. Even if a claim is not successful, defending such a claim may be time-consuming and expensive.

In order to continue to expand our business and sustain our revenue growth, we will need to acquire additional marketed products or product candidates in clinical development through in-licensing or the acquisitions of businesses that
we believe are a strategic fit with us. We may not be able to in-license or acquire suitable products at an acceptable price or at all. In addition, engaging in any in-licensing or acquisitions will incur a variety of costs, and we may never realize
the anticipated benefits of any such in-license or acquisition.

As part of our long-term strategy and in order to sustain our revenue
growth, we intend to seek to acquire or in-license additional marketed products or product candidates in clinical development that treat serious or life threatening illnesses, which treat high unmet medical needs, which require limited commercial
infrastructure, and that have the potential to provide both top and bottom line growth. Even if we are able to locate products, product candidates in clinical development or businesses that fit within our strategic focus, we cannot assure you that
we will be able to negotiate agreements to acquire or in-license such additional products or product candidates in clinical development on acceptable terms or at all. Further, if we acquire a product, product candidates in clinical development or
business, the process of integrating the acquired product, product candidates in clinical development or business may result in unforeseen operating difficulties and expenditures and may divert significant management attention from our ongoing
business operations. Moreover, we may fail to realize the anticipated benefits for a variety of reasons, such as an acquired product candidate proving to not be safe or effective in later clinical trials. We may fund any future acquisition by
issuing equity or debt securities, which could dilute the ownership percentages of our existing stockholders. Acquisition efforts can consume significant management attention and require substantial expenditures, which could detract from our other
programs. In addition, we may devote resources to potential acquisitions that are never completed. We cannot assure you that an acquired product, product candidates in clinical development or business will have the intended effect of helping us to
sustain our revenue growth. If we are unable to do so, our business could be materially adversely affected.



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Our long-term success depends upon our ability to develop, receive regulatory approval
for and commercialize drug product candidates and, if we are not successful, our ability to generate revenues from the commercialization and sale of products resulting from our product candidates will be limited.

All of our drug candidates will require governmental approvals prior to commercialization. Our failure to develop, receive regulatory approvals for and
commercialize our development stage product candidates successfully will prevent us from generating revenues from the sale of products resulting from our product candidates. Our product candidates are in the development stage and may not be shown to
be safe or effective.

Cinryze

We are currently evaluating with our partner Sanquin, the feasibility of additional indications and/or other formulations for Cinryze. We plan to initially focus on C-1 mediated diseases affecting
transplant patients. In addition, we have submitted a MAA for Cinryze for acute treatment of HAE and prophylaxis of HAE to the EMA and anticipate that the filing will be accepted in the first half of 2010. We also intend to seek approval to market
Cinryze in certain additional territories throughout the world outside of the U.S. and Europe.

Non-toxigenic difficile

In February 2006, we entered into a licensing agreement for the rights to develop non-toxigenic strains of C. difficile, or
NTCD, for the treatment and prevention of CDI. We plan to initially focus our efforts on the opportunity to prevent recurrence of CDI following treatment with antibiotics such as Vancocin. We began a Phase 1 clinical trial for NTCD during the
third quarter of 2009. The Phase 1 study will determine the safety and tolerability of NTCD dosed orally as a single and repeat escalating doses in healthy young and older adults. Following completion of the phase 1 study, a phase 2 study is planned
although the results of the clinical trials may not support further clinical development.

Maribavir

We continue to evaluate our maribavir program in light of the phase 3 trial results. We initiated a phase 3 study in stem cell transplant patients for
maribavir in September 2006 and a second phase 3 study in liver transplant patients in July 2007. On February 9, 2009 we announced that such phase 3 study did not achieve its primary endpoint or key secondary endpoints. In the event we are
unable to develop a path forward to develop maribavir, we will not generate any future revenue from maribavir.

We cannot be certain that our
efforts and the efforts of our partners regarding our product candidates will lead to commercially viable products. Negative, inconclusive or inconsistent clinical trial results, such as the results relating to our Phase 3 study of maribavir in stem
cell transplant patients could prevent regulatory approval, increase the cost and timing of regulatory approval, cause us to perform additional studies or to file for a narrower indication than planned. We do not know what the final cost to
manufacture product candidates in commercial quantities will be, or the dose required to treat patients and, consequently, what the total cost of goods for a treatment regimen will be.

If we are unable to successfully develop our product candidates, we will not have a source of revenue other than Vancocin and Cinryze. Moreover, the failure of one or more of our product candidates in
clinical development could harm our ability to raise additional capital. Furthermore, results from our clinical trials may not meet the level of statistical significance required by the FDA or other regulatory authorities for approval of a drug
candidate. For example, our phase 3 trial evaluating maribavir in stem cell transplant patients did not achieve its primary endpoint and failed to meet its key secondary endpoints.

The development of any of our product candidates is subject to many risks, including that:



| |  |  | the product candidate is found to be ineffective or unsafe;
| | - |  | -----------------------------------------------------------



| |  |  | the clinical test results for the product candidate delay or prevent regulatory approval;
| | - |  | -----------------------------------------------------------------------------------------



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| |  |  | the FDA or other regulatory authorities forbid us to initiate or continue testing of the product candidates in human clinical trials;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the product candidate cannot be developed into a commercially viable product;
| | - |  | -----------------------------------------------------------------------------



| |  |  | the product candidate is difficult and/or costly to manufacture;
| | - |  | ----------------------------------------------------------------



| |  |  | the product candidate later is discovered to cause adverse effects that prevent widespread use, require withdrawal from the market, or serve as the
basis for product liability claims;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | third party competitors hold proprietary rights that preclude us from marketing the product candidate; and
| | - |  | ----------------------------------------------------------------------------------------------------------



| |  |  | third party competitors market a more clinically effective, safer, or more cost-effective product.
| | - |  | --------------------------------------------------------------------------------------------------

Even if we believe that the clinical data sufficiently demonstrates the safety and efficacy of a product candidate, regulators may disagree with us, which
could delay, limit or prevent the approval of such product candidate. In addition, regulatory approval may take longer than we expect as a result of a number of factors, including failure to qualify for priority review of our application. All
statutes and regulations governing the approval of our product candidates are subject to change in the future. These changes may increase the time or cost of regulatory approval, limit approval, or prevent it completely.

The foreign regulatory approval process includes all of the risks associated with FDA approval set forth above, as well as additional country-specific
regulations. Whether or not we obtain FDA approval for a product, we must obtain approval of a product by the comparable regulatory authorities of foreign countries before we can commence clinical trials or marketing of the product in those
countries. The approval process varies from country to country, and the time may be longer or shorter than that required for FDA approval. The requirements governing the conduct of clinical trials, product licensing, pricing and reimbursement vary
greatly from country to country.

Even if we receive regulatory approval for our product candidates, or acquire the rights to additional
products which have received regulatory approvals, the later discovery of previously unknown problems with a product, manufacturer or facility may result in adverse consequences, including withdrawal of the product from the market. Approval of a
product candidate may be subject to a risk evaluation mitigation strategy may be conditioned upon certain limitations and restrictions as to the drugs use, or upon the conduct of further studies, and may be subject to continuous review.

The regulatory process is expensive, time consuming and uncertain and may prevent us from obtaining required approvals
for the commercialization of our product candidates.

We have a product candidate, NTCD, for the treatment and prevention of CDI in
clinical development. In addition, we are currently evaluating with our partner Sanquin, the feasibility of additional therapeutic uses and potential indications as well as other modes of administration for Cinryze. We expect to conduct clinical
studies during 2010 to assess at least one additional therapeutic use of Cinryze as well as a study related to another mode of administration. Merck is conducting the clinical development of pleconaril. We must complete significant laboratory,
animal and clinical testing on these product candidates before submitting marketing applications in the U.S. and abroad.

The rate of
completion of clinical trials depends upon many factors, including the rates of initiation of clinical sites and enrollment of patients. If we are unable to initiate a sufficient number of clinical sites and accrue sufficient clinical patients who
are eligible to participate in the trials during the appropriate period, we may need to delay our clinical trials and incur significant additional costs. In addition, the FDA, Independent Safety Monitoring Boards or Institutional Review Boards may
require us to delay, restrict, or discontinue our clinical trials on various grounds, including a finding that the subjects or patients are being exposed to an unacceptable health risk. In addition, we may be unable to submit a NDA to the FDA or
marketing petitions to other regulatory



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authorities such as the EMEA for our product candidates within the time frame we currently expect, or at all. Once an NDA or other form of petition for marketing authority is submitted, it must
be approved by the FDA or other regulatory authority before we can commercialize the product described in the application. The cost of human clinical trials varies dramatically based on a number of factors, including:



| |  |  | the number, order and timing of clinical indications pursued;
| | - |  | -------------------------------------------------------------



| |  |  | the number of patients required for enrollment;
| | - |  | -----------------------------------------------



| |  |  | the length of time required to enroll these patients;
| | - |  | -----------------------------------------------------



| |  |  | the costs and difficulty of obtaining clinical supplies of the product candidate; and
| | - |  | -------------------------------------------------------------------------------------



| |  |  | the difficulty in obtaining sufficient patient populations and clinicians.
| | - |  | --------------------------------------------------------------------------

Even if we obtain positive preclinical or clinical trial results in initial studies, future clinical trial results may not be similarly positive. As a
result, ongoing and contemplated clinical testing, if permitted by governmental authorities, may not demonstrate that a product candidate is safe and effective in the patient population and for the disease indications for which we believe it will be
commercially advantageous to market the product. The failure of our clinical trials to demonstrate the safety and efficacy of our product candidate for the desired indications could delay the commercialization of the product.

In 2003, Congress enacted the Pediatric Research Equity Act requiring the development and submission of pediatric use data for new drug products. In Europe,
a Pediatric Investigational Plan must be agreed before a MAA can be submitted. Our failure to obtain these data, or to obtain a deferral of, or exemption from, these requirements could adversely affect our chances of receiving regulatory approval,
or could result in regulatory or legal enforcement actions.

Our strategic plan may not achieve the intended results.

We made the strategic decision to focus on the development of later stage opportunities by expanding our product portfolio through the
acquisition of complementary clinical development stage or commercial product opportunities as a means to accelerate our path toward becoming a profitable pharmaceutical company. As a result of this strategic decision, we substantially discontinued
our early stage activities, and do not maintain discovery research or significant internal preclinical development capabilities. Our restructuring efforts have placed, and may continue to place, a strain on our managerial, operational, financial and
other resources.

We may not be successful in executing our strategy. We may not be able to in-license or acquire suitable products at an
acceptable price, or at all. In addition, engaging in any in-licensing or acquisition will incur a variety of costs, and we may never realize the anticipated benefits of any such in-license or acquisition. We may need additional financing in order
to acquire additional new products or product candidates. Acquisition efforts can consume significant management attention and require substantial expenditures, which could detract from our other programs. In addition, we may devote resources to
potential acquisitions that are never completed.

We cannot assure you that an acquired product, product candidates in clinical development or
business will have the intended effect of helping us sustain our revenue growth in the near term or longer term. If we are unable to do so, our business could be materially adversely affected.

We depend on collaborations with third parties, which may reduce our product revenues or restrict our ability to commercialize
products, and also ties our success to the success of our collaborators.

We have entered into, and may in the future enter into
additional, sales and marketing, distribution, manufacturing, development, licensing and other strategic arrangements with third parties.



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Sales of Cinryze are dependent on distribution rights that we have received from Sanquin pursuant to a
distribution agreement relating to the treatment of HAE in the United States and a separate agreement related to other territories. During the term of the agreement, Sanquin will supply us with our commercial requirements for C1 INH for the
treatment of HAE in each country where we have received regulatory approval, subject to minimum annual purchase requirements in Euros equal to approximately 25.8 (approximately $37.0 million) million per year, net of the agreed upon discount.

In August 2003, we entered into a license agreement with GSK under which we acquired exclusive worldwide rights, excluding Japan, from GSK to
develop and commercialize an antiviral compound, maribavir, for the prevention and treatment of CMV infections related to transplant, including solid organ and hematopoietic stem cell / bone marrow transplantation, congenital transmission, and in
patients with HIV infection. GSK retained the exclusive right to market and sell products covered by these patents and patent applications in Japan.

In November 2004, we announced that we entered into a license agreement with Schering Plough Corporation, since acquired by Merck & Co, Inc. under which Merck assumed responsibility for all future development and commercialization
of pleconaril. Sanofi-Aventis also has exclusive rights to market and sell pleconaril in countries other than the U.S. and Canada for which we will receive a royalty. Merck will receive a portion of any royalty payments made to us under our license
agreement with Sanofi-Aventis for rights to pleconaril. If Merck or Sanofi-Aventis does not successfully market and sell products in their respective territories, we will not receive revenue from royalties on their sales of products.

We are currently engaged in additional discussions relating to other arrangements. We cannot be sure that we will be able to enter into any such
arrangements with third parties on terms acceptable to us or at all. Third party arrangements may require us to grant certain rights to third parties, including exclusive marketing rights to one or more products, or may have other terms that are
burdensome to us.

Our ultimate success may depend upon the success of our collaborators. We have obtained from Sanquin, GSK and
Sanofi-Aventis, and will attempt to obtain in the future, licensed rights to certain proprietary technologies and compounds from other entities, individuals and research institutions, for which we may be obligated to pay license fees, make milestone
payments and pay royalties. In addition, we may in the future enter into collaborative arrangements for the marketing, sales and distribution of our product candidates, which may require us to share profits or revenues. We may be unable to enter
into additional collaborative licensing or other arrangements that it needs to develop and commercialize its drug candidates. Moreover, we may not realize the contemplated benefits from such collaborative licensing or other arrangements. These
arrangements may place responsibility on our collaborative partners for preclinical testing, human clinical trials, the preparation and submission of applications for regulatory approval, or for marketing, sales and distribution support for product
commercialization. We cannot be certain that any of these parties will fulfill their obligations in a manner consistent with our best interest. These arrangements may also require us to transfer certain material rights or issue our equity securities
to corporate partners, licensees or others. Any license or sublicense of our commercial rights may reduce our product revenue. Moreover, we may not derive any revenues or profits from these arrangements. In addition, our current strategic
arrangements may not continue and we may be unable to enter into future collaborations. Collaborators may also pursue alternative technologies or drug candidates, either on their own or in collaboration with others, that are in direct competition
with us.

If we fail to comply with our obligations in the agreements under which we license development or
commercialization rights to products or technology from third parties, we could lose license rights that are important to our business.

Our rights to Cinryze is based upon intellectual property that we have licensed from Sanquin and two of our current product candidates are based on intellectual property that we have licensed from Sanofi-Aventis and GSK. We depend, and will
continue to depend, on these license agreements. All of our license agreements may be terminated if, among other events, we fail to satisfy our obligations as they relate to the development of the



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particular product candidate. All of our license agreements, other than the agreements with Lilly regarding Vancocin, may also be terminated if we breach that license agreement and do not cure
the breach within specified time periods or in the event of our bankruptcy or liquidation. Our agreement with Lilly permits us to suspend the licenses granted to us by Lilly in the event of uncured defaults by us until such time as the default is
cured or otherwise resolved.

Our agreement with Sanquin includes minimum purchase requirements and our license agreement with GSK imposes
various obligations on us, including milestone payment requirements and royalties. If we fail to comply with these obligations, Sanquin and GSK may have the right to terminate the license, in which event we would not be able to market products
covered by the license.

Disputes may arise with respect to our licensing agreements regarding manufacturing, development and
commercialization of any of the particular product candidates. These disputes could lead to delays in or the termination of the development, manufacture and commercialization of our product candidates or to litigation.

Many other entities seek to establish collaborative arrangements for product research and development, or otherwise acquire products,
in competition with us.

We face competition from large and small companies within the pharmaceutical and biotechnology industry, as
well as public and private research organizations, academic institutions and governmental agencies in acquiring products and establishing collaborative arrangements for product development. Many of the companies and institutions that compete against
us have substantially greater capital resources, research and development staffs and facilities than we have. These entities represent significant competition to us as we seek to expand further our pipeline through the in-license or acquisition of
additional products in clinical development, or that are currently on the market. Moreover, while it is not feasible to predict the actual cost of acquiring additional product candidates, that cost could be substantial. We may need additional
financing in order to acquire additional new products.

There are many potential competitors with respect to our product
candidates under development, who may develop products and technologies that make our products and/or technologies non-competitive or obsolete.

There are many entities, both public and private, including well-known, large pharmaceutical companies, chemical companies, biotechnology companies and research institutions, engaged in developing pharmaceuticals for applications similar to
those targeted by our products under development.

We are aware of several product candidates in clinical development which may compete with
NTCD. Optimer Pharmaceuticals is developing a narrow spectrum antibiotic which recently completed a second Phase III clinical trial for treatment and recurrence of CDI infection. Merck & Co., Inc. licensed a monoclonal antibody developed by
Massachusetts Biological Labs which is in Phase II clinical trials for treatment of CDI infection. Additionally, SanofiAventis is developing a C. difficile vaccine which is in Phase II studies for the prevention and recurrence of CDI. There
are products already marketed by F. Hoffman La-Roche, AstraZeneca and Gilead Sciences Inc. for the prevention and treatment of CMV. Developments by these or other entities may render our product candidates non-competitive or obsolete. Furthermore,
many of our competitors have greater resources available to them to assist with development and commercialization, obtaining regulatory approvals and product manufacturing and marketing. Accordingly, our competitors may succeed in obtaining
regulatory approval for products more rapidly and more effectively than we do for product candidates. Competitors may succeed in developing products that are more effective and less costly than any that we develops and also may prove to be more
successful in the manufacturing and marketing of products.

Any product that we successfully develop and for which we gain regulatory approval
must then compete for market acceptance and market share. Accordingly, important competitive factors, in addition to completion of clinical testing and the receipt of regulatory approval, will include product efficacy, safety, timing and scope of



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regulatory approvals, availability of supply, marketing and sales capacity, reimbursement coverage, pricing and patent protection. Our products could also be rendered obsolete or uneconomical by
regulatory or competitive changes.

Any of our future products may not be accepted by the market, which would harm our
business and results of operations.

Even if our product candidates are approved by the FDA and other regulatory authorities, they may
not achieve market acceptance by patients, prescribers and third-party payors. As a result, we may not receive revenues from these products as anticipated. The degree of market acceptance will depend upon a number of factors, including:



| |  |  | the receipt and timing of regulatory approvals, and the scope of marketing and promotion activities permitted by such approvals (e.g., the
label for the product approved by the FDA);
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the availability of third-party reimbursement from payors such as government health programs and private health insurers;
| | - |  | -------------------------------------------------------------------------------------------------------------------------



| |  |  | the establishment and demonstration in the medical community, such as doctors and hospital administrators, of the clinical safety, efficacy and
cost-effectiveness of drug candidates, as well as their advantages over existing treatment alternatives, if any;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the effectiveness of the sales and marketing force that may be promoting our products; and
| | - |  | ------------------------------------------------------------------------------------------



| |  |  | the effectiveness of our contract manufacturers.
| | - |  | ------------------------------------------------

If our product candidates do not achieve market acceptance by a sufficient number of patients, prescribers and third-party payors, our business will be materially adversely affected.

The current credit and financial market conditions may exacerbate certain risks affecting our business.

Sales of our products are dependent, in large part, on reimbursement from government health administration authorities, private health insurers and third
party distributors. As a result of the current credit and financial market conditions, these organizations may be unable to satisfy their reimbursement obligations or may delay payment. In addition, federal and state health authorities may reduce
Medicare and Medicaid reimbursements, and private insurers may increase their scrutiny of claims. A reduction in the availability or extent of reimbursement could negatively affect our product sales and revenue.

Due to the recent tightening of global credit, there may be a disruption or delay in the performance of our third-party contractors, suppliers or
collaborators. We rely on third parties for several important aspects of our business, including our product manufacturing, supply chain management, conduct of clinical trials, and raw materials. If such third parties are unable to satisfy their
commitments to us, our business would be adversely affected. Finally, if the banking system or the financial markets continue to deteriorate or remain volatile, our investment portfolio may be impacted and the values and liquidity of our investments
could be adversely affected.

Funding, especially on terms acceptable to us, may not be available to meet our future
capital needs because of the deterioration of the credit and capital markets.

Global market and economic conditions have been, and
continue to be, disruptive and volatile. The debt and equity capital markets have been impacted by significant write-offs in the financial services sector and the re-pricing of credit risk in the broadly syndicated market, among other things. These
events have negatively affected general economic conditions.

In particular, the cost of raising money in the debt and equity capital markets
has increased substantially while the availability of funds from those markets has diminished significantly. Also, as a result of concern about the stability of financial markets generally and the solvency of counterparties specifically, the cost of
obtaining



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money from the credit markets has increased as many lenders and institutional investors have increased interest rates, enacted tighter lending standards and reduced and, in some cases, ceased to
provide funding to borrowers.

If funding is not available when needed, or is available only on unfavorable terms, meeting our capital needs
or otherwise taking advantage of business opportunities, such as acquisitions, may become challenging, which could have a material adverse effect on our business plans, revenues and results of operations.

Historically, Vancocin has been subject to limitations on the amount of payment and reimbursement available to patients from third
party payors.

Historically, only a portion of the cost of Vancocin prescriptions has been paid for or reimbursed by managed care
organizations, government and other third party payors. This reimbursement policy makes Vancocin less attractive, from a net-cost perspective, to patients and, to a lesser degree, prescribing physicians. For example, metronidazole, a drug frequently
prescribed for CDI, is significantly less expensive than Vancocin. If adequate reimbursement levels are not provided for Vancocin, or if reimbursement policies increasingly favor other products, our market share and net sales could be negatively
affected, as could our overall business and financial condition.

Our successful commercialization of our product
candidates will depend, in part, on the availability and adequacy of third party reimbursement.

Our ability to commercialize our
product candidates successfully will depend, in part, on the extent to which reimbursement for the cost of such products and related treatments will be available from government health administration authorities, such as Medicare and Medicaid in the
U.S., private health insurers and other organizations. Federal and state regulations govern or influence the reimbursement to health care providers of fees in connection with medical treatment of certain patients. In the U.S., there have been, and
we expects there will continue to be, a number of state and federal proposals that could limit the amount that state or federal governments will pay to reimburse the cost of drugs. Continued significant changes in the health care system could have a
material adverse effect on our business. Decisions by state regulatory agencies, including state pharmacy boards, and/or retail pharmacies may require substitution of generic for branded products, may prefer competitors products over our own,
and may impair our pricing and thereby constrain our market share and growth. In addition, we believe the increasing emphasis on managed care in the U.S. could put pressure on the price and usage of our product candidates, which may in turn
adversely impact future product sales.

Significant uncertainty exists as to the reimbursement status of newly approved health care products,
particularly for indications for which there is no current effective treatment or for which medical care typically is not sought. Adequate third-party coverage may not be available to enable us to maintain price levels sufficient to realize an
appropriate return on our investment in product development. If adequate coverage and reimbursement levels are not provided by government and third-party payors for use of our products, our products may fail to achieve market acceptance and we could
lose anticipated revenues and experience delayed achievement of profitability.

In recent years, various legislative proposals have been
offered in the U.S. Congress and in some state legislatures that include major changes in the health care system. These proposals have included price or patient reimbursement constraints on medicines and restrictions on access to certain products.
We cannot predict the outcome of such initiatives, and it is difficult to predict the future impact of the broad and expanding legislative and regulatory requirements affecting us.

We rely on our employees, consultants, contractors, suppliers, manufacturers and collaborators to keep our trade secrets confidential.

We rely on trade secrets, trademarks, and unpatented proprietary know-how and continuing technological innovation in developing and
manufacturing our products, including Vancocin, in order to protect our significant investment in these products from the risk of discovery by generic drug manufacturers and other potential



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competition. We require each of our employees, consultants, advisors, contractors, suppliers, manufacturers and collaborators to enter into confidentiality agreements prohibiting them from taking
our proprietary information and technology or from using or disclosing proprietary information to third parties except in specified circumstances. The agreements also provide that all inventions conceived by an employee, consultant or advisor, to
the extent appropriate for the services provided during the course of the relationship, are our exclusive property, other than inventions unrelated to us and developed entirely on the individuals own time. Nevertheless, these agreements may
not provide meaningful protection of our trade secrets and proprietary know-how if they are used or disclosed. Despite all of the precautions we may take, people who are not parties to confidentiality agreements may obtain access to our trade
secrets or know-how. In addition, others may independently develop similar or equivalent trade secrets or know-how.

We
depend on patents and proprietary rights for our products which are in clinical development, which may offer only limited protection against potential infringement, and if we are unable to protect our patents and proprietary rights, we may lose the
right to develop, manufacture, market or sell products and lose sources of revenue.

The pharmaceutical industry places considerable
importance on obtaining patent and trade secret protection for new technologies, products and processes. Our success depends, in part, on our ability to develop and maintain a strong patent position for our products and technologies in clinical
development, both in the U.S. and in other countries. Litigation or other legal proceedings may be necessary to defend against claims of infringement, to enforce our patents, or to protect our trade secrets, and could result in substantial cost to
us and diversion of our efforts. We intend to file applications as appropriate for patents describing the composition of matter of our drug candidates, the proprietary processes for producing such compositions, and the uses of our drug candidates.
We own three issued U.S. patents, one non-U.S. patents and have a number of pending U.S. patent applications, some of which we co-own with collaborators. We also have filed international, regional and non-U.S. national patent applications in order
to pursue patent protection in major foreign countries.

Many of our scientific and management personnel were previously employed by competing
companies. As a result, such companies may allege trade secret violations and similar claims against us.

To facilitate development of our
proprietary technology base, we may need to obtain licenses to patents or other proprietary rights from other parties. If we are unable to obtain such licenses, our product development efforts may be delayed. We may collaborate with universities and
governmental research organizations which, as a result, may acquire certain rights to any inventions or technical information derived from such collaboration.

We may incur substantial costs in asserting any patent rights and in defending suits against us related to intellectual property rights, even if we are ultimately successful. If we are unsuccessful in
defending a claim that we have infringed or misappropriated the intellectual property of a third party, we could be required to pay substantial damages, stop using the disputed technology, develop new non-infringing technologies, or obtain one or
more licenses from third parties. If we or our licensors seek to enforce our patents, a court may determine that our patents or our licensors patents are invalid or unenforceable, or that the defendants activity is not covered by the
scope of our patents or our licensors patents. The U.S. Patent and Trademark Office or a private party could institute an interference proceeding relating to our patents or patent applications. An opposition or revocation proceeding could be
instituted in the patent offices of foreign jurisdictions. An adverse decision in any such proceeding could result in the loss of our rights to a patent or invention.

If our licensors do not protect our rights under our license agreements with them or do not reasonably consent to our sublicense of rights or if these license agreements are terminated, we may lose
revenue and expend significant resources defending our rights.

We have licensed from GSK worldwide rights, excluding Japan, to an
antiviral compound, maribavir, for the prevention and treatment of CMV infections related to transplant. This compound and a related compound are subject to patents and patent applications in a variety of countries throughout the world. We have
licensed from



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Sanofi-Aventis the exclusive U.S. and Canadian rights to certain antiviral agents for use in picornavirus indications, which are the subject of U.S. and Canadian patents and patent applications
owned by Sanofi-Aventis, certain of which describe pleconaril and others of which describe compounds that are either related to pleconaril or have antiviral activity. We sublicensed our rights under these patents to Merck. We depend on GSK and
Sanofi-Aventis to prosecute and maintain many of these patents and patent applications and protect such patent rights. Failure by GSK or Sanofi-Aventis to prosecute or maintain such patents or patent applications and protect such patent rights could
lead to our loss of revenue. Under certain circumstances, our ability to sublicense our rights under these license agreements is subject to the licensors consent. If our license agreements with GSK and Sanofi-Aventis are terminated, our
ability to manufacture, develop, market and sell products under those agreements would terminate.

We depend on key
personnel and may not be able to retain these employees or recruit additional qualified personnel, which would harm our ability to compete.

We are highly dependent upon qualified scientific, technical and managerial personnel, including our President and CEO, Vincent J. Milano, our Vice President, Chief Operating Officer, Daniel B. Soland, our Vice President, Chief Financial
Officer, Charles Rowland, our Vice President, Chief Scientific Officer, Colin Broom, our Vice President, Global Regulatory Affairs and Quality, Robert Pietrusko and our Vice President, Strategic Initiatives, Thomas Doyle. Our ability to grow and
expand into new areas and activities will require additional expertise and the addition of new qualified personnel in both the United States and Europe. There is intense competition for qualified personnel in the pharmaceutical field. Therefore, we
may not be able to attract and retain the qualified personnel necessary for the development of our business. Furthermore, we have not entered into non-competition agreements or employment agreements with our key employees. The loss of the services
of existing personnel, as well as the failure to recruit additional key scientific, technical and managerial personnel in a timely manner, would harm our development programs, and our ability to manage day-to-day operations, attract collaboration
partners, attract and retain other employees and generate revenues. We do not maintain key man life insurance on any of our employees.

Even after regulatory approval is received, as with Vancocin and Cinryze, if we fail to comply with regulatory requirements, or if we experience unanticipated problems with our approved products, they could be subject to restrictions
or withdrawal from the market.

Cinryze and Vancocin are, and any other product for which we obtain marketing approval from the FDA or
other regulatory authority will be, subject to continual review and periodic inspection by the FDA and other regulatory bodies. After approval of a product, we will have, and with Cinryze and Vancocin, we currently have, significant ongoing
regulatory compliance obligations related to manufacturing processes, quality control, labeling, post-approval clinical data collection and promotional activities for each such product. Later discovery of previously unknown problems with our
products or manufacturing processes, or failure to comply with regulatory requirements, may result in penalties or other actions, including:



| |  |  | warning letters;
| | - |  | ----------------



| |  |  | class restrictions or black-box warnings
| | - |  | ------------------------------------------



| |  |  | fines;
| | - |  | ------



| |  |  | product recalls;
| | - |  | ----------------



| |  |  | withdrawal of regulatory approval;
| | - |  | ----------------------------------



| |  |  | operating restrictions, including restrictions on such products or manufacturing processes;
| | - |  | -------------------------------------------------------------------------------------------



| |  |  | disgorgement of profits;
| | - |  | ------------------------



| |  |  | injunctions; and
| | - |  | ----------------



| |  |  | criminal prosecution.
| | - |  | ---------------------



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As part of the approval for Cinryze, we are required to conduct a clinical study designed to evaluate
safety, including thrombotic adverse events, efficacy and immunogenicity of higher than 1000 Units doses of Cinryze every three or four days for routine prophylaxis. Collection and periodic reporting of CMC data also have been requested as a
post-approval commitment. In the event we are unable to comply with these requirements and commitments, we may be subject to penalties or other actions. In addition, in June 2009, we received an untitled letter from the Office of Compliance and
Biologics Quality in the FDA Center for Biologics Evaluation and Research alleging promotional materials were false or misleading because they present efficacy claims for Cinryze but failed to reveal, and they minimize, material facts; they make
unsubstantiated comparative claims; and they overstate the efficacy of Cinryze. We have revised our marketing materials and the FDA has closed the review of these materials.

Over the past few years, a significant number of pharmaceutical and biotechnology companies have been the target of inquiries and investigations by various federal and state regulatory, investigative,
prosecutorial and administrative entities, including the DOJ and various U.S. Attorneys Offices, the Office of Inspector General of the Department of Health and Human Services, the FDA, the FTC and various state Attorneys General offices.
These investigations have alleged violations of various federal and state laws and regulations, including claims asserting antitrust violations, violations of the Food, Drug and Cosmetic Act, the False Claims Act, the Prescription Drug Marketing
Act, anti-kickback laws, and other alleged violations in connection with off-label promotion of products, pricing and Medicare and/or Medicaid reimbursement. It is both costly and time-consuming for us to comply with these extensive regulations to
which it is subject. Additionally, incidents of adverse drug reactions, unintended side effects or misuse relating to our products could result in additional regulatory controls or restrictions, or even lead to withdrawal of a product from the
market.

Companies may not promote drugs for off-label usesthat is, uses that are not described in the products
labeling and that differ from those approved by the FDA. Physicians may prescribe drug products for off-label uses, and such off-label uses are common across some medical specialties. Although the FDA and other regulatory agencies do not regulate a
physicians choice of treatments, the Federal Food, Drug and Cosmetics Act and FDA regulations restrict communications on the subject of off-label uses of drug products by pharmaceutical companies. The Office of Inspector General of the
Department of Health and Human Services (OIG) and FDA both actively enforce laws and regulations prohibiting promotion of off-label uses and the promotion of products for which marketing clearance has not been obtained. A company that is found to
have improperly promoted off-label uses may be subject to significant liability, including civil and administrative remedies as well as criminal sanctions.

Notwithstanding the regulatory restrictions on off-label promotion, the OIG and the FDA allow companies to engage in truthful, non-misleading, and non-promotional speech concerning their products.
Although we believe that all of our communications regarding all of our products are in compliance with the relevant legal requirements, the OIG or the FDA may disagree, and we may be subject to significant liability, including civil and
administrative remedies, as well as criminal sanctions. In addition, managements attention could be diverted from our business operations and our reputation could be damaged.

The FDA provides guidelines with respect to appropriate promotion and continuing medical and health education activities. Although we endeavor to follow these guidelines, the FDA or the OIG may disagree,
and we may be subject to significant liability, including civil and administrative remedies as well as criminal sanctions. Should the government choose to initiate action against us, we could face substantial penalties, which could have a material
adverse effect on our business, financial condition and results of operations. In addition, managements attention could be diverted and our reputation could be damaged.

In addition, anti-kickback laws make it illegal for a prescription drug manufacturer to solicit, offer, or pay any remuneration in exchange for purchasing, leasing or ordering any service or items
including the purchase or prescription of a particular drug for which payment may be made under a federal health care program. Because of the sweeping language of the federal anti-kickback statute, many potentially beneficial business arrangements



44



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would be prohibited if the statute were strictly applied. To avoid this outcome, the U.S. Department of Health and Human Services has published regulationsknown as safe harbors
that identify exceptions or exemptions to the statutes prohibitions. Arrangements that do not fit within the safe harbors are not automatically deemed to be illegal, but must be evaluated on a case-by-case basis for compliance with the
statute. We seek to comply with anti-kickback statutes and to fit within one of the defined safe harbors. However, due to the breadth of the statutory provisions and the absence of uniform guidance in the form of regulations or court
decisions, there can be no assurance that our practices will not be challenged under anti-kickback or similar laws. Violations of such restrictions may be punishable by civil and/or criminal sanctions, including fines and civil monetary penalties,
as well as the possibility of exclusion from U.S. federal healthcare programs (including Medicaid and Medicare). Any such violations could have a material adverse effect on our business, financial condition and results of operations.

In recent years, several states and localities, including California, the District of Columbia, Maine, Massachusetts, Minnesota, Nevada, New
Hampshire, New Mexico, Vermont, Texas, and West Virginia, have enacted legislation requiring pharmaceutical companies to establish marketing compliance programs, and file periodic reports with the state or make periodic public disclosures on sales,
marketing, pricing, clinical trials, and other activities. Similar legislation is being considered by the federal government and other states. Many of these requirements are new and uncertain, and the penalties for failure to comply with these
requirements are unclear. If we are found not to be in full compliance with these laws, we could face enforcement action and fines and other penalties, and could receive adverse publicity.

Any of these events could result in a material adverse effect on our revenues and financial condition.

Our future product revenues from sales of Vancocin and Cinryze could be reduced by imports from countries where similar products are
available at lower prices.

Vancocin has been approved for sale outside of the U.S., including but not limited to Canada, Brazil and
Europe, and Lilly or its licensees continue to market Vancocin outside of the U.S. There are products similar to Cinryze which are approved in the E.U. There have been cases in which pharmaceutical products were sold at steeply discounted prices in
markets outside the U.S. and then imported to the United States where they could be resold at prices higher than the original discounted price, but lower than the prices commercially available in the U.S. If this happens with Vancocin or Cinryze our
revenues would be adversely affected. Additionally, there are non-U.S., Internet-based companies supplying Vancocin directly to patients at significantly reduced prices.

In recent years, various legislative proposals have been offered in the U.S. Congress and in some state legislatures that would authorize re-importation of pharmaceutical products into the U.S. from other
countries including Canada. We cannot predict the outcome of such initiatives, which if adopted, could result in increased competition for our products and lower prices.

Risks associated with our international business relationships could materially adversely affect our business.

We are engaged in clinical trials and have employees located in Europe, have established manufacturing relationships, and are seeking approval to market Cinryze in Europe. We have also established our own
commercial sales and marketing personnel in Europe and plan to increase the number of personnel in certain European countries. In the future, we may enter into distribution arrangements with third parties to market our products and product
candidates in countries outside of the United States and Europe. Consequently, we are, and will continue to be, subject to risks related to operating in foreign countries. Risks associated with conducting operations in foreign countries include:



| |  |  | differing regulatory requirements for drug approvals in foreign countries;
| | - |  | --------------------------------------------------------------------------



| |  |  | changes in tariffs, trade barriers and regulatory requirements;
| | - |  | ---------------------------------------------------------------



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| |  |  | economic weakness, including inflation, or political instability in particular foreign economies and markets;
| | - |  | -------------------------------------------------------------------------------------------------------------



| |  |  | compliance with tax, employment, immigration and labor laws for employees living or traveling abroad;
| | - |  | -----------------------------------------------------------------------------------------------------



| |  |  | foreign taxes, including withholding of payroll taxes;
| | - |  | ------------------------------------------------------



| |  |  | foreign currency fluctuations, which could result in increased operating expenses or reduced revenues, and other obligations incident to doing business
or operating a subsidiary in another country;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | workforce uncertainty in countries where labor unrest is more common than in the United States;
| | - |  | -----------------------------------------------------------------------------------------------



| |  |  | production shortages resulting from any events affecting raw material supply or manufacturing capabilities abroad; and
| | - |  | ----------------------------------------------------------------------------------------------------------------------



| |  |  | business interruptions resulting from geo-political actions, including war and terrorism.
| | - |  | -----------------------------------------------------------------------------------------

These and other risks associated with our international operations may materially adversely affect our ability to attain or maintain profitable operations.

Our indebtedness and other financial obligations may harm our financial condition and results of operations.

Our total consolidated long-term debt as of December 31, 2009 is $205.0 million. Our level of indebtedness could have important
consequences to you, because:



| |  |  | a portion of our cash flows from operations will have to be dedicated to interest and may not be available for operations, working capital, capital
expenditures, expansion, acquisitions or general corporate or other purposes;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | it may impair our ability to obtain additional financing in the future;
| | - |  | -----------------------------------------------------------------------



| |  |  | it may limit our flexibility in planning for, or reacting to, changes in our business and industry; and
| | - |  | -------------------------------------------------------------------------------------------------------



| |  |  | it may make us more vulnerable to downturns in our business, our industry or the economy in general.
| | - |  | ----------------------------------------------------------------------------------------------------

Our operations may not generate sufficient cash to enable us to service our debt. If we fail to make a payment on the senior convertible notes, we could be
in default on the senior convertible notes, and this default could cause us to be in default on our other outstanding indebtedness. Conversely, a default on our other outstanding indebtedness may cause a default under the senior convertible notes.

We have a future liability in the form of a contingent value payments to the former stockholders of Lev upon the achievement of a commercial
target. The CVR payment of $0.50 per share ($87.5 million) would become payable when Cinryze reaches at least $600 million in cumulative net product sales within 10 years of closing of the acquisition. We cannot predict if or when the payment may be
payable or if it could materially adversely affect our business at the time of payment.

Our stock price could continue
to be volatile.

Our stock price, like the market price of the stock of other pharmaceutical companies, has been volatile. For example,
during the twelve months ended December 31, 2009, the market price for our common stock fluctuated between $14.55 and $3.79 per share following the announcement of the results of our clinical trial results relating to maribavir. The following
factors, among others, could have a significant impact on the market for our common stock:



| |  |  | period to period fluctuations in sales of Vancocin and Cinryze;
| | - |  | ---------------------------------------------------------------



| |  |  | approvals of generic products that compete with Vancocin;
| | - |  | ---------------------------------------------------------



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| |  |  | our ability to successfully manufacture sufficient amounts of Cinryze to meet demand and increase manufacturing capacity;
| | - |  | -------------------------------------------------------------------------------------------------------------------------



| |  |  | results of clinical trials with respect to our product candidates in development or those of our competitors, such as the February 2009 clinical trial
results relating to maribavir;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | developments with our collaborators;
| | - |  | ------------------------------------



| |  |  | announcements of technological innovations or new products by our competitors;
| | - |  | ------------------------------------------------------------------------------



| |  |  | litigation or public concern relating to our products or our competitors products;
| | - |  | -----------------------------------------------------------------------------------



| |  |  | developments in patent or other proprietary rights of our or its competitors (including related litigation);
| | - |  | ------------------------------------------------------------------------------------------------------------



| |  |  | any announcement regarding our acquisition of product candidates or entities;
| | - |  | -----------------------------------------------------------------------------



| |  |  | future announcements concerning our industry;
| | - |  | ---------------------------------------------



| |  |  | governmental regulation;
| | - |  | ------------------------



| |  |  | changes in federal, state and foreign tax laws and related regulations;
| | - |  | -----------------------------------------------------------------------



| |  |  | actions or decisions by the SEC, the FDA or other regulatory agencies;
| | - |  | ----------------------------------------------------------------------



| |  |  | changes or announcements of changes in reimbursement policies;
| | - |  | --------------------------------------------------------------



| |  |  | period to period fluctuations in our operating results, including changes in accounting estimates;
| | - |  | --------------------------------------------------------------------------------------------------



| |  |  | our cash and cash equivalents balances;
| | - |  | ---------------------------------------



| |  |  | changes in our capital structure;
| | - |  | ---------------------------------



| |  |  | changes in estimates of our performance by securities analysts;
| | - |  | ---------------------------------------------------------------



| |  |  | market conditions applicable to our business sector; and
| | - |  | --------------------------------------------------------



| |  |  | general market conditions.
| | - |  | --------------------------

The rights that have been and may in the future be granted to holders of our common or preferred stock may adversely affect the rights of other stockholders and may discourage a takeover.

Our board of directors has the authority to issue up to 4,800,000 shares of preferred stock and to determine the price, privileges and other
terms of such shares. Our board of directors may exercise this authority without the approval of, or notice to, our stockholders. Accordingly, the rights of the holders of our common stock may be adversely affected by the rights of the holders of
any preferred stock that may be issued in the future. In addition, the issuance of preferred stock may make it more difficult for a third party to acquire a majority of our outstanding voting stock in order to effect a change in control or replace
our current management. We are also subject to the anti-takeover provisions of Section 203 of the Delaware General Corporation Law. The application of Section 203 could also delay or prevent a third party or a significant stockholder of
ours from acquiring control of us or replacing its current management. In general, Section 203 prohibits a publicly held Delaware corporation from engaging in a business combination with an interested stockholder for a period of three years
following the date the person became an interested stockholder, unless the business combination or the transaction in which the person became an interested stockholder is approved in a prescribed manner. Generally, a business combination includes a
merger, asset or stock sale, or other transaction resulting in a financial benefit to the interested stockholder. Under Delaware law, an interested stockholder is a person who, together with affiliates and associates, owns 15% or more of a
corporations voting stock.

In addition, our charter and bylaws contain certain provisions that could discourage a hostile takeover,
such as a staggered board of directors and significant notice provisions for nominations of directors and proposals. Our charter and bylaws may make it more difficult for a third party to acquire a majority of our outstanding voting stock in order
to effect a change in control or replace our current management.



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The convertible note hedge and warrant transactions may affect the value of the senior
convertible notes and our common stock.

In connection with the issuance of the senior convertible senior notes, we have entered into
privately-negotiated transactions with two counterparties, or the counterparties, comprised of purchased call options and warrants sold. These transactions are expected to generally reduce the potential equity dilution of our common stock upon
conversion of the senior convertible notes.

In connection with establishing their initial hedge of these transactions, the counterparties may
have entered into various derivative transactions with respect to our common stock concurrently with, or shortly after, the pricing of the senior convertible notes. These activities could have the effect of increasing or preventing a decline in the
price of our common stock concurrently with or following the pricing of the senior convertible notes. In addition, the counterparties (and/or their affiliates) may modify their hedge positions following the pricing of the senior convertible notes
from time to time by entering into or unwinding various derivative transactions with respect to our common stock or by purchasing or selling our common stock in secondary market transactions, which could adversely affect the value of our common
stock or could have the effect of increasing or preventing a decline in the value of our common stock. Additionally, these transactions expose us to counterparty credit risk for nonperformance. We manage our exposure to counterparty credit risk
through specific minimum credit standards, and diversification of counterparties.

The potential effect, if any, of any of these transactions
and activities on the market price of our common stock will depend in part on market conditions and cannot be ascertained at this time. Any of these activities could adversely affect the value of our common stock.

We do not make any representation or prediction as to the direction or magnitude of any potential effect that the transactions described above may have on
the price of the senior convertible notes or the shares of our common stock. In addition, we do not make any representation that the counterparties will engage in these transactions or that these transactions, once commenced, will not be
discontinued without notice.

The fundamental change purchase feature of the senior convertible notes may delay or
prevent an otherwise beneficial attempt to take over our company.

The terms of the senior convertible notes require us to purchase the
senior convertible notes for cash in the event of a fundamental change. A takeover of our company would trigger the requirement that we purchase the senior convertible notes. Alternatively, if certain transactions that constitute a fundamental
change occur, under certain circumstances, we will increase the conversion rate by a number of additional shares of our common stock to compensate holders for the lost option time value of the senior convertible notes as a result of such
transaction. This increased conversion rate will apply only to holders who convert their senior convertible notes in connection with any such transaction. The number of the additional shares of our common stock will be determined based on the date
on which the transaction becomes effective and the price paid per share of our common stock. This may have the effect of delaying or preventing a takeover of our company that would otherwise be beneficial to investors.



|ITEM 1B. | UNRESOLVED STAFF COMMENTS
|-------- | -------------------------

None.



|ITEM 2. | PROPERTIES
|------- | ----------

In March 2008, we entered
into a lease, comprising 78,264 square feet of office and related space, for the Companys headquarters located in Exton, Pennsylvania. The lease expires in April 2015. In connection with the lease, we also received a leasehold improvement
allowance of $2.3 million.



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In May 2008, we entered into a lease in Maidenhead, United Kingdom, comprising 8,000 square feet of office
space, for our U.K. operations. The lease expires in May 2018. We are also a party to a short term lease for a shared services facility in Brussels and anticipate that during 2010 we will evaluate potential opportunities to accommodate our continued
expansion in Europe.

On January 30, 2007, we purchased a 33,000 square feet facility located in Exton, PA. We vacated this space in
October 2008 when we moved into our new headquarters. In October 2009, we leased this facility to a third party for an initial term of five years.



|ITEM 3. | LEGAL PROCEEDINGS
|------- | -----------------

From time to time we
are a party to litigation in the ordinary course of our business. We do not believe these matters, even if adversely adjudicated or settled, would have a material adverse effect on our financial condition, results of operations or cash flows.



|ITEM 4. | SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS
|------- | ---------------------------------------------------

None.



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PART II



|ITEM 5. | MARKET FOR THE REGISTRANTS COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES
|------- | ----------------------------------------------------------------------------------------------------------------

Market Information

Our common stock is traded on the Global Market segment of The NASDAQ Stock Market under the symbol VPHM. We commenced trading on The NASDAQ Stock Market on November 19, 1996. The following table sets forth the high and low
sale prices as quoted on The NASDAQ Stock Market for each quarter of 2008 and 2009 and through February 19, 2010.



|                                               |  |      |       |     |   |     
|---------------------------------------------- |  | ---- | ----- | --- | - | ----
|                                               |  | High |       | Low
|Year ended December 31, 2008                   |  |      |       |     |   |     
|First Quarter                                  |  | $    | 9.96  |     | $ | 8.18
|Second Quarter                                 |  | $    | 11.28 |     | $ | 8.73
|Third Quarter                                  |  | $    | 15.09 |     | $ | 9.41
|Fourth Quarter                                 |  | $    | 13.46 |     | $ | 9.49
|                                               |  |     
|Year ended December 31, 2009                   |  | $    | 14.15 |     | $ | 3.98
|First Quarter                                  |  | $    | 7.08  |     | $ | 4.73
|Second Quarter                                 |  | $    | 9.98  |     | $ | 5.53
|Third Quarter                                  |  | $    | 9.80  |     | $ | 7.30
|Fourth Quarter                                 |  |      |       |     |   |     
|First Quarter 2010 (through February 19, 2010) |  | $    | 10.49 |     | $ | 8.63

Holders and
Dividends

There were approximately 694 record holders of our common stock as of February 19, 2010. We have never declared or paid
any cash dividends on our common stock. We have declared and paid dividends in the past on our previously outstanding Series A convertible participating preferred stock. As of February 24, 2010, we had no shares of preferred stock outstanding.
Any future determination to pay dividends will be at the discretion of our board of directors and will be dependent on then existing conditions, including our financial condition, results of operations, contractual restrictions, capital
requirements, business and other factors our board of directors deems relevant. We anticipate for the foreseeable future, we will retain our earnings in order to finance investments in our business.



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|ITEM 6. | SELECTED FINANCIAL DATA
|------- | -----------------------

The selected
financial data presented below under the caption Consolidated Statement of Operations Data for the years ended December 31, 2009, 2008, 2007, 2006 and 2005 and under the caption Consolidated Balance Sheet Data as of
December 31, 2009, 2008, 2007, 2006 and 2005 are derived from our consolidated financial statements which have been audited. The data set forth below should be read in conjunction with Managements Discussion and Analysis of Financial
Condition and Results of Operations, the Consolidated Financial Statements and the notes thereto and the other financial information included elsewhere in this Report.

In November 2004, we acquired all rights in the U.S. and its territories to manufacture market and sell Vancocin, as well as rights to certain related vancomycin products, from Eli Lilly and Company
(Lilly). Additionally, in October 2008, we acquired Lev Pharmaceuticals, Inc. See Note 10 of the Consolidated Financial Statements.



|                                                                          |      |                         |         |      |  |   |         |   |  |      |         |   |      |   |         |   |  |   |         |  
|------------------------------------------------------------------------- | ---- | ----------------------- | ------- | ---- |  | - | ------- | - |  | ---- | ------- | - | ---- | - | ------- | - |  | - | ------- | -
|(in thousands, except per share amounts)                                  |      | Year Ended December 31, |        
|                                                                          | 2009 |                         |         | 2008 |  |   | 2007    |   |  | 2006 |         |   | 2005 |  
|Consolidated Statement of Operations Data:                                |      |                         |         |      |  |   |         |   |  |      |         |   |      |   |         |   |  |   |         |  
|Net product sales                                                         |      | $                       | 310,449 |      |  | $ | 232,307 |   |  | $    | 203,770 |   |      | $ | 166,617 |   |  | $ | 125,853 |  
|                                                                          |      |                         |         |      |  |   |         |   |  |      |         |   |      |   |         |   |  |   |         |  
|Total revenues                                                            |      |                         | 310,449 |      |  |   | 232,307 |   |  |      | 203,770 |   |      |   | 167,181 |   |  |   | 132,417 |  
|                                                                          |      |                         |         |      | 
|Operating expenses:                                                       |      |                         |         |      |  |   |         |   |  |      |         |   |      |   |         |   |  |   |         |  
|Cost of sales (excluding amortization of product rights)                  |      |                         | 40,214  |      |  |   | 8,874   |   |  |      | 8,934   |   |      |   | 18,984  |   |  |   | 18,029  |  
|Research and development (1)                                              |      |                         | 52,083  |      |  |   | 64,434  |   |  |      | 33,925  |   |      |   | 17,890  |   |  |   | 9,994   |  
|Selling, general and administrative (1)                                   |      |                         | 89,316  |      |  |   | 67,270  |   |  |      | 38,995  |   |      |   | 25,832  |   |  |   | 11,091  |  
|Intangible amortization and acquisition of technology rights              |      |                         | 28,183  |      |  |   | 10,809  |   |  |      | 6,120   |   |      |   | 5,669   |   |  |   | 5,158   |  
|Goodwill impairment                                                       |      |                         | 65,099  |      |  |   |        |   |  |      |        |   |      |   |        |   |  |   |        |  
|Impairment loss                                                           |      |                         | 3,424   |      |  |   | 2,265   |   |  |      |        |   |      |   |        |   |  |   |        |  
|                                                                          |      |                         |         |      |  |   |         |   |  |      |         |   |      |   |         |   |  |   |         |  
|Total operating expenses                                                  |      |                         | 278,319 |      |  |   | 153,652 |   |  |      | 87,974  |   |      |   | 68,375  |   |  |   | 44,272  |  
|                                                                          |      |                         |         |      |  |   |         |   |  |      |         |   |      |   |         |   |  |   |         |  
|Operating income                                                          |      |                         | 32,130  |      |  |   | 78,655  |   |  |      | 115,796 |   |      |   | 98,806  |   |  |   | 88,145  |  
|                                                                          |      |                         |         |      | 
|Interest income                                                           |      |                         | 352     |      |  |   | 14,296  |   |  |      | 24,265  |   |      |   | 9,853   |   |  |   | 2,008   |  
|Interest expense                                                          |      |                         | (11,609 | )    |  |   | (12,951 | ) |  |      | (9,612  | ) |      |   | (686    | ) |  |   | (11,304 | )
|Other income (expense)                                                    |      |                         | 9,079   |      |  |   |        |   |  |      |        |   |      |   | 555     |   |  |   | (2,949  | )
|                                                                          |      |                         |         |      | 
|Income tax expense (benefit) (2)                                          |      |                         | 41,029  |      |  |   | 16,040  |   |  |      | 38,344  |   |      |   | 41,862  |   |  |   | (37,805 | )
|                                                                          |      |                         |         |      |  |   |         |   |  |      |         |   |      |   |         |   |  |   |         |  
|Net (loss) income from continuing operations                              |      | $                       | (11,077 | )    |  | $ | 63,960  |   |  | $    | 92,105  |   |      | $ | 66,666  |   |  | $ | 113,705 |  
|                                                                          |      |                         |         |      |  |   |         |   |  |      |         |   |      |   |         |   |  |   |         |  
|Net (loss) income per share from continuing operations:                   |      |                         |         |      |  |   |         |   |  |      |         |   |      |   |         |   |  |   |         |  
|Basic                                                                     |      | $                       | (0.14   | )    |  | $ | 0.90    |   |  | $    | 1.32    |   |      | $ | 0.97    |   |  | $ | 2.56    |  
|Diluted                                                                   |      | $                       | (0.14   | )    |  | $ | 0.84    |   |  | $    | 1.21    |   |      | $ | 0.95    |   |  | $ | 2.02    |  
|                                                                          |      |                         |         |      | 
|Shares used in computing net income from continuing operations per share: |      |                         |         |      |  |   |         |   |  |      |         |   |      |   |         |   |  |   |         |  
|Basic                                                                     |      |                         | 77,423  |      |  |   | 71,391  |   |  |      | 69,827  |   |      |   | 68,990  |   |  |   | 44,334  |  
|Diluted                                                                   |      |                         | 77,423  |      |  |   | 85,712  |   |  |      | 80,891  |   |      |   | 70,338  |   |  |   | 57,610  |  



|                                                  |      |                    |           |  |      |           |      |   |         |  |   |         |  |   |        
|------------------------------------------------- | ---- | ------------------ | --------- |  | ---- | --------- | ---- | - | ------- |  | - | ------- |  | - | -------
|                                                  |      | As of December 31,
|                                                  | 2009 |                    | 2008      |  | 2007 |           | 2006 |   | 2005   
|Consolidated Balance Sheet Data:                  |      |                    |           |  |      |           |      |   |         |  |   |         |  |   |        
|Cash, cash equivalents and short-term investments |      | $                  | 331,672   |  | $    | 275,839   |      | $ | 584,328 |  | $ | 255,409 |  | $ | 233,413
|Working capital                                   |      |                    | 406,375   |  |      | 317,413   |      |   | 596,819 |  |   | 266,443 |  |   | 166,666
|                                                  |      |                    |           |  |     
|Total assets                                      |      |                    | 1,084,451 |  |      | 1,086,129 |      |   | 771,605 |  |   | 429,694 |  |   | 435,525
|Long-term debt (2)(3)                             |      |                    | 138,614   |  |      | 161,003   |      |   | 153,572 |  |   |        |  |   |       
|Total stockholders equity (3)                    |      |                    | 750,387   |  |      | 749,334   |      |   | 558,530 |  |   | 411,899 |  |   | 326,977



|(1) | Certain prior year amounts related to our medical education and medical affairs costs have been reclassified within operating expenses to conform to
the current year presentation.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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|(2) | We adopted the new accounting provisions for our convertible debt securities as of January 1, 2009 and retrospectively applied this change in accounting to all
prior periods presented for which we had applicable outstanding convertible debt, as required by this new standard. The adoption is discussed further in Note 3 of the Consolidated Financial Statements.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(3) | At December 31, 2005, $78.9 million of the subordinated convertible notes were reported as a current obligation, a component of working capital, since, as of
December 31, 2005, it was the Companys intent to redeem these notes the first quarter of 2006.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

We have never paid
dividends on our common stock.



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|ITEM 7. | MANAGEMENTS DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
|------- | -------------------------------------------------------------------------------------

Background

ViroPharma Incorporated and subsidiaries is a global biotechnology company dedicated to the development and commercialization of products that address serious diseases, with a focus on products used by
physician specialists or in hospital settings. We have two marketed products and two development programs. We intend to grow through sales of our marketed products, CinryzeTMand Vancocin®, through continued development of our product pipeline, expansion of sales of Cinryze into additional territories and through potential acquisition or licensing of
products or acquisition of companies.

We market and sell Cinryze in the United States for routine prophylaxis against angioedema attacks in
adolescent and adult patients with hereditary angioedema (HAE). Cinryze is a C1 esterase inhibitor therapy for routine prophylaxis against HAE, also known as C1 inhibitor (C1-INH) deficiency, a rare, severely debilitating, life-threatening genetic
disorder. Cinryze was obtained in October 2008, when we completed our acquisition of Lev Pharmaceuticals, Inc. (Lev). On January 8, 2010 we acquired expanded rights to commercialize Cinryze and future C1-INH derived products in certain
European countries and other territories throughout the world (as described in the strategic relationships section) as well as rights to develop future C1-INH derived products for additional indications. We intend to seek to commercialize Cinryze in
Europe in 2011 in countries which we have distribution rights. We are currently evaluating our commercialization plans in additional territories. We also intend to conduct studies to identify further therapeutic uses and expand the labeled
indication for Cinryze to potentially include other C1 mediated diseases as well as new modes of administration.

We also market and sell
Vancocin HCl capsules, the oral capsule formulation of vancomycin hydrochloride, in the U.S. and its territories. Vancocin is a potent antibiotic approved by the U.S. Food and Drug Administration, or FDA, to treat antibiotic-associated
pseudomembranous colitis caused by Clostridium difficileinfection (CDI), or C. difficile, and enterocolitis caused by Staphylococcus aureus, including methicillin-resistant strains.

We currently have two development programs, C1 esterase inhibitor [human] to identify further therapeutic uses and potential additional indications and
other modes of administration for the treatment of HAE and other C1 mediated diseases and a non-toxigenic strain of C. difficile (NTCD) for the treatment and prevention of CDI. On August 6, 2009 we announced that dosing has begun in the Phase 1
clinical trial for NTCD. The Phase 1 study will determine the safety and tolerability of NTCD dosed orally as a single and repeat escalating doses in healthy young and older adults. On February 9, 2009, we announced that our Phase 3 trial
evaluating maribavir used as prophylaxis in allogeneic stem cell, or bone marrow, transplant (SCT) patients did not achieve its primary endpoint. In the primary analysis, there was no statistically significant difference between maribavir and
placebo in reducing the rate of CMV disease. Additionally, on February 13, 2009, we announced that enrollment in our Phase 3 trial evaluating maribavir in liver transplant patients was discontinued and that all patients on study drug were moved
to the current standard of care. We continue to evaluate our maribavir program in light of the Phase 3 clinical trial results.

We licensed
the U.S. and Canadian rights for a further product development candidate, an intranasal formulation of pleconaril, to Merck & Co., Inc. for the treatment of picornavirus infections.

We intend to continue to evaluate in-licensing or other opportunities to acquire products in development, or those that are currently on the market. We plan to seek products that treat serious or life
threatening illnesses with a high unmet medical need, require limited commercial infrastructure to market, and that provide both top and bottom line growth over time.



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Executive Summary

Since December 31, 2008, we experienced the following:

Business Activities

Cinryze:



| |  |  | Shipped approximately 26,000 doses of Cinryze to specialty pharmacy/specialty distributors (SP/SDs);
| | - |  | -----------------------------------------------------------------------------------------------------



| |  |  | Secured rights to develop, file regulatory dossiers, and commercialize Cinryze for HAE as well as potential new indications in certain European and
rest of world countries; and
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Began enrollment in a Phase 4 study to evaluate the safety and effect of escalating doses of Cinryze as prophylactic therapy (a post approval
requirement of the FDA);
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------

C. difficileinfection (CDI):



| |  |  | Initiated Phase 1 clinical trial for NTCD;
| | - |  | ------------------------------------------



| |  |  | Vancocin scripts decreased 9.3% in 2009 as compared to 2008; and
| | - |  | ----------------------------------------------------------------



| |  |  | The Pharmaceutical Science and Clinical Pharmacology Advisory Committee voted to support a component of the FDAs Office of Generic Drugs draft
guidelines on bioequivalence for Vancocin;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

CMV:



| |  |  | Recorded expenses of $19.1 million for the year ended December 31, 2009 related to costs incurred prior to and in connection with the wind-down of
our Phase 3 clinical trials for maribavir;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Financial Results



| |  |  | Recorded net sales of Cinryze of $97.3 million;
| | - |  | -----------------------------------------------



| |  |  | Net sales of Vancocin decreased to $213.1 million for the year ended December 31, 2009 from $232.3 million for the year ended December 31, 2008;
and
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Reported net loss of $11.1 million;
| | - |  | -----------------------------------

Liquidity



| |  |  | Generated net cash from operations of $84.8 million; and
| | - |  | --------------------------------------------------------



| |  |  | Ended 2009 with working capital of $406.4 million, which includes cash and cash equivalents of $331.7 million.
| | - |  | --------------------------------------------------------------------------------------------------------------

During 2010 and going forward, we expect to face a number of challenges, which include the following:

The commercial sale of approved pharmaceutical products is subject to risks and uncertainties. There can be no assurance that future Vancocin sales will meet
or exceed the historical rate of sales for the product, for reasons that include, but are not limited to, generic and non-generic competition for Vancocin and/or changes in prescribing habits or disease incidence.

We cannot assure you that generic competitors will not take advantage of the absence of patent protection for Vancocin to attempt to market a competing
product. We are not able to predict the time period in which a generic drug may enter the market.

The FDA convened a meeting of its Advisory
Committee for Pharmaceutical Science and Clinical Pharmacology to discuss bioequivalence recommendations for oral vancomycin hydrochloride capsule drug products on August 4, 2009. The Advisory Committee was asked if the proposed guidelines are
sufficient for establishing



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bioequivalence for generic vancomycin oral capsules. The Advisory Committee voted unanimously in favor of the component of the proposed OGD recommendation that requires bioequivalence to be
demonstrated through comparable dissolution in media of pH 1.2, 4.5 and 6.8 for potential vancomycin HCl capsule generic products that (a) contain the same active and inactive ingredients in the same amounts as Vancocin HCl capsules;
(b) meet currently accepted standards for assay, potency, purity, and stability (equivalent to those in place for Vancocin HCl capsules); and (c) are manufactured according to cGMP. We have opposed both the substance of the FDAs
bioequivalence method and the manner in which it was developed. In the event the OGDs revised approach regarding the conditions that must be met in order for a generic drug applicant to request a waiver of in-vivo bioequivalence testing for
Vancocin remains in effect, the time period in which a generic competitor may enter the market would be reduced. There can be no assurance that the FDA will agree with the positions stated in our Vancocin related submissions or that our efforts to
oppose the OGDs March 2006 and December 2008 recommendation to determine bioequivalence to Vancocin through in-vitro dissolution testing will be successful. We cannot predict the timeframe in which the FDA will make a decision regarding either
our citizen petition for Vancocin or the approval of generic versions of Vancocin. If we are unable to change the recommendation set forth by the OGD in March 2006 as revised in December 2008 and voted upon by the Advisory Committee for
Pharmaceutical Science and Clinical Pharmacology, the threat of generic competition will be high.

The FDA approved Cinryze for routine
prophylaxis against angioedema attacks in adolescent and adult patients with hereditary angioedema on October 10, 2008. Cinryze became commercially available for routine prophylaxis against HAE in December 2008 and the commercial success of
Cinryze will depend on several factors, including: the number of patients with HAE that may be treated with Cinryze; acceptance by physicians and patients of Cinryze as a safe and effective treatment; our ability to effectively market and distribute
Cinryze in the United States; cost effectiveness of HAE treatment using Cinryze; relative convenience and ease of administration of Cinryze; potential advantages of Cinryze over alternative treatments; the timing of the approval of competitive
products including another C1 esterase inhibitor for the acute treatment of HAE; the market acceptance of competing approved products such as Berinert; patients ability to obtain sufficient coverage or reimbursement by third-party payors;
sufficient supply and reasonable pricing of raw materials necessary to manufacture Cinryze; and manufacturing or supply interruptions and capacity which could impair our ability to acquire an adequate supply of Cinryze to meet demand for the
product; and our ability to achieve expansion of manufacturing capabilities in the capacities and timeframes currently anticipated. In addition, our ability to develop life cycle management plans for Cinryze, including designing and commencing
clinical studies for additional indications, seeking rights to additional geographic territories and pursuing regulatory approvals in such territories will impact our ability to generate future revenues from Cinryze.

We will face intense competition in acquiring additional products to expand further our product portfolio. Many of the companies and institutions that we
will compete with in acquiring additional products to expand further our product portfolio have substantially greater capital resources, research and development staffs and facilities than we have, and greater resources to conduct business
development activities. We may need additional financing in order to acquire new products in connection with our plans as described in this report.

The outcome of our clinical development programs is subject to considerable uncertainties. We cannot be certain that we will be successful in developing and ultimately commercializing any of our product candidates, that the FDA or other
regulatory authorities will not require additional or unanticipated studies or clinical trial outcomes before granting regulatory approval, or that we will be successful in gaining regulatory approval of any of our product candidates in the
timeframes that we expect, or at all. For example, on February 9, 2009, we announced that our Phase 3 trial evaluating maribavir used as prophylaxis in allogeneic stem cell, or bone, marrow, transplant patients did not achieve its primary
endpoints. In the primary analysis, there was no statistically significant difference between maribavir and placebo in reducing the rate of CMV disease. In addition, the study failed to meet its key secondary endpoints. Maribavir was generally well
tolerated in this clinical study. We continue to evaluate our potential development strategy for the maribavir program in light of the Phase 3 clinical trials results and evolving information.



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We cannot assure you that our current cash and cash equivalents or cash flows from Vancocin and Cinryze
sales will be sufficient to fund all of our ongoing development and operational costs, as well as the interest payable on our outstanding senior convertible notes, over the next several years, that planned clinical trials can be initiated, or that
planned or ongoing clinical trials can be successfully concluded or concluded in accordance with our anticipated schedule and costs. Moreover, the results of our business development efforts could require considerable investments.

Our actual results could differ materially from those results expressed in, or implied by, our expectations and assumption described in this Annual Report
on Form 10-K. The risks described in this report, our Form 10-K for the year ended December 31, 2009 are not the only risks facing us. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also
may materially adversely affect our business, financial condition and/or operating results. Please also see our discussion of the Risk Factors in Item 1A, which describe other important matters relating our business.

Results of Operations

We adopted the new accounting provisions for our convertible debt securities as of January 1, 2009 and retrospectively applied this change in accounting to all prior periods presented for which we had applicable outstanding convertible
debt, as required by this new standard. The adoption is discussed further in Note 3 of the Consolidated Financial Statements.

Years ended December 31, 2009 and 2008



|                                                         |  |                                 |         |   |      |   |        
|-------------------------------------------------------- |  | ------------------------------- | ------- | - | ---- | - | -------
|                                                         |  | For the years endedDecember 31,
|(in thousands, except per share data)                    |  | 2009                            |         |   | 2008
|Net product sales                                        |  | $                               | 310,449 |   |      | $ | 232,307
|Cost of sales (excluding amortization of product rights) |  | $                               | 40,214  |   |      | $ | 8,874  
|Operating income                                         |  | $                               | 32,130  |   |      | $ | 78,655 
|Net (loss) income                                        |  | $                               | (11,077 | ) |      | $ | 63,960 
|Net (loss) income per share:                             |  |                                 |         |   |      |   |        
|Basic                                                    |  | $                               | (0.14   | ) |      | $ | 0.90   
|Diluted                                                  |  | $                               | (0.14   | ) |      | $ | 0.84   

The $32.1 million in operating income
for the year ended December 31, 2009 decreased as compared to $78.7 million in the same period in 2008 which resulted primarily from the impairment of goodwill in the first quarter of 2009 ($65.1 million), increased cost of sales ($31.3
million), increased intangible amortization associated with our acquisition of Lev ($17.4 million) and increased SG&A costs related to the launch of Cinryze ($22.0 million), partially offset by increased net sales of Vancocin and Cinryze ($78.1
million).

Revenues

Revenues consisted of the following:



|                  |  |                                 |         |      |   |        
|----------------- |  | ------------------------------- | ------- | ---- | - | -------
|                  |  | For the years endedDecember 31,
|(in thousands)    |  | 2009                            |         | 2008
|Net product sales |  |                                 |         |      |   |        
|Vancocin          |  | $                               | 213,138 |      | $ | 232,284
|Cinryze           |  |                                 | 97,311  |      |   | 23     
|                  |  |                                 |         |      |   |        
|Total revenues    |  | $                               | 310,449 |      | $ | 232,307
|                  |  |                                 |         |      |   |        



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RevenueVancocin and Cinryze product sales

We sell Vancocin only to wholesalers who then distribute the product to pharmacies, hospitals and long-term care facilities, among others. Our sales of
Vancocin are influenced by wholesaler forecasts of prescription demand, wholesaler buying decisions related to their desired inventory levels, and, ultimately, end user prescriptions, all of which could be at different levels from period to period.

We sell Cinryze to specialty pharmacy/specialty distributors (SP/SDs) who then sell and distribute to physicians, hospitals and
patients, among others. Beginning in the second quarter of 2009, we recognized revenue based upon shipments of Cinryze to SP/SDs due to our ability to meet the revenue recognition criteria specifically our ability to estimate our payor mix. We
previously recognized revenue upon shipment of Cinryze from SP/SDs to patients. We are temporarily managing the rate at which additional patients are started on drug to ensure that those already receiving commercial drug, and those new
patients who start their routine prophylaxis will continue with a reliable uninterrupted supply of Cinryze. Our team is working with Sanquin to complete a two tiered scale up process that is intended to significantly increase available supply in the
second quarter of 2010 and beyond. When the additional supply enters the market, we will then return to adding new patients at a normal rate.

During the year ended December 31, 2009, net sales of Vancocin decreased 8.2% compared to the same period in 2008. The decrease for the year ended December 31, 2009 is primarily due to lower sales volumes driven by lower rates of
severe disease, as compared to last year at this time, and a suspected increase in compounding seen both in the hospital and long-term care marketplace, partially offset by the price increases in 2009. Based upon data reported by IMS Health
Incorporated, prescriptions during the year ended December 31, 2009 decreased from the same period in 2008 period by 9.3%. The units sold for the year ended December 31, 2009 decreased by 17.0% compared to the same period in 2008.

Vancocin product sales are influenced by prescriptions and wholesaler forecasts of prescription demand, which could be at different levels
from period to period. Cinryze product sales are influenced by prescriptions. In the third quarter of 2009, we began to manage patients added to Cinryze therapy to ensure patients on drug will continue to receive Cinryze in future periods. We
receive inventory data from our three largest wholesalers through our fee for service agreements and our two SP/SDs through service agreements. We do not independently verify this data. Based on this inventory data and our estimates, we
believe that as of December 31, 2009, the wholesalers and SP/SDs did not have excess channel inventory.

Cost
of sales (excluding amortization of product rights)

Cost of sales increased for the year ended December 31, 2009 by $31.3 million
as compared to the same period in the prior year due to Cinryze which was launched in December 2008. Included in the Cost of sales for the year ended December 31, 2009 was $1.8 million that was previously deferred. Cost of sales during the year
ended December 31, 2008 did not include Cinryze as we acquired Lev Pharmaceuticals in October 2008. Vancocin and Cinryze cost of sales includes the cost of materials and distribution costs and excludes amortization of product rights. As part of
our October 2008 purchase of Lev, we acquired Cinryze inventory which was recorded at fair value in purchase accounting. This step-up of inventory value increased the cost of sales during the year ended December 31, 2009 by $6.9 million. We
have utilized all inventory that was recorded at fair value as part of the Lev purchase in 2009.

Since units are shipped based upon earliest
expiration date, we would expect the cost of product sales of both Vancocin and Cinryze to fluctuate from quarter to quarter as we may experience fluctuations in quarterly manufacturing yields.

Research and development expenses

For each of our research and development programs, we incur both direct and indirect expenses. Direct expenses include third party costs related to these programs such as contract research, consulting,
cost sharing payments or receipts, and preclinical and development costs. Indirect expenses include personnel, facility, stock compensation



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and other overhead costs. Due to advancements in our NTCD preclinical program, the start of our Phase 4 commitment for Cinryze, and our plan to conduct additional clinical studies using Cinryze
we expect costs in these programs to exceed current costs. We are evaluating our maribavir program which was discontinued in February 2009.

Research and development expenses were divided between our research and development programs in the following manner:



|                                            |      |                                 |        |  |   |       
|------------------------------------------- | ---- | ------------------------------- | ------ |  | - | ------
|(in thousands)                              |      | For the years endedDecember 31,
|                                            | 2009 |                                 | 2008  
|DirectCore programs                        |      |                                 |        |  |   |       
|CMV                                         |      | $                               | 15,715 |  | $ | 35,200
|Non-toxigenic strains of C. difficle (NTCD) |      |                                 | 9,801  |  |   | 4,702 
|Cinryze                                     |      |                                 | 7,067  |  |   | 5,226 
|Vancocin                                    |      |                                 | 675    |  |   | 603   
|HCV                                         |      |                                 | 8      |  |   | 762   
|Indirect                                    |      |                                 |        |  |   |       
|Development                                 |      |                                 | 18,817 |  |   | 17,941
|                                            |      |                                 |        |  |   |       
|Total                                       |      | $                               | 52,083 |  | $ | 64,434
|                                            |      |                                 |        |  |   |       

Direct ExpensesCore Development Programs

Our direct expenses related to our CMV program decreased during the year ended December 31, 2009 as we wound-down our stem cell and liver
transplant studies. Costs incurred during 2009 include enrollment in our solid organ (liver) study through February 2009, conducting follow-up visits and continuing to evaluate the results of our Phase 3 programs. In February 2009, based upon
preliminary analysis of the data, we announced that our Phase 3 trial evaluating maribavir used as prophylaxis in allogeneic stem cell, or bone, marrow, transplant patients did not achieve its primary endpoints. In the primary analysis, there was no
statistically significant difference between maribavir and placebo in reducing the rate of CMV disease. In addition, the study failed to meet its key secondary endpoints. We are continuing to analyze the study results. Additionally, we announced
that our Phase 3 trial evaluating maribavir in liver transplant patients was discontinued and that all patients on study drug were moved to the current standard of care. During 2008, we continued recruitment and site initiations into ongoing phase 3
studies of maribavir in patients undergoing allogeneic stem cell transplant at transplant centers in the U.S., Canada and several European Countries and patients undergoing liver transplantation in the U.S. and Europe. Additionally, we began
executing on our pre-launch plans for our clinical, regulatory and commercial activities for maribavir in the U.S. and Europe.

In April 2008,
we announced that ViroPharma and Wyeth jointly discontinued the development of HCV-796 due to the safety issue that emerged in the Phase 2 trial in patients with hepatitis C. We also announced that ViroPharma and Wyeth do not expect to continue to
collaborate on future development of hepatitis C treatment candidates and the agreement expired in accordance with its terms during the third quarter of 2009.

In October 2008, we acquired Cinryze, a C1 inhibitor, which has been approved by the FDA for routine prophylaxis of HAE. During 2009, we incurred costs related to the Cinryze open label trials which
closed on March 31, 2009 and for our Phase 4 clinical trial.

The increase in costs of NTCD in 2009 over 2008 relate to increased
research and development activities, costs associated with manufacturing NTCD spores and costs associated with our Phase 1 clinical trial.

Vancocin costs in 2009 and 2008 related to additional research activities.

Anticipated fluctuations in future direct expenses are
discussed under LiquidityDevelopment Programs.



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Indirect Expenses

These costs primarily relate to the compensation of and overhead attributable to our development team. During the second half of 2009, our development team has shifted its focus from our CMV program to
our Cinryze and NTCD programs.

Selling, general and administrative expenses

Selling, general and administrative expenses (SG&A) increased for the year December 31, 2009 by $22.0 million over the same period in 2008. This
increase was driven by the expansion of our Cinryze field force ($13.2 million), increased professional fees ($2.7 million), and increased marketing efforts ($2.6 million). Included in SG&A are legal and consulting costs incurred related to our
opposition to the attempt by the OGD regarding the conditions that must be met in order for a generic drug application to request a waiver of in-vivo bioequivalence testing for copies of Vancocin, which were $5.5 million and $4.0 million in the year
of 2009 and 2008, respectively. We anticipate that these additional legal and consulting costs will gradually diminish in future periods. We anticipate continued increased spending in selling, general and administrative expenses in future periods as
we continue the commercial launch of Cinryze.

Intangible amortization and acquisition of technology rights

Intangible amortization is the result of the Vancocin product rights acquisition in the fourth quarter of 2004 as well as the acquisition of
Cinryze product rights in October 2008. Additionally, as described in our agreement with Lilly, to the extent that we incur an obligation to Lilly for additional payments on Vancocin sales, we have contingent consideration. We record the obligation
as an adjustment to the carrying amount of the related intangible asset and a cumulative adjustment to the intangible amortization upon achievement of the related sales milestones. Contingent consideration and Lilly related additional payments are
more fully described in Note 6 of the Consolidated Financial Statements.

Intangible amortization for the year ended December 31, 2009
was $28.2 million, as compared to $10.8 million in 2008. Amortization increased in 2009 as compared to 2008 due to the full year inclusion of the intangible asset acquired in our acquisition of Lev Pharmaceuticals.

On an ongoing periodic basis, we evaluate the useful life of our intangible assets and determine if any economic, governmental or regulatory event has
modified their estimated useful lives. This evaluation did not result in a change in the life of the intangible assets during the quarter ended December 31, 2009. We will continue to monitor the actions of the FDA and OGD surrounding the
bioequivalence recommendation for Vancocin and consider the effects of our opposition efforts, any announcements by generic competitors or other adverse events for additional impairment indicators. We will reevaluate the expected cash flows and fair
value of our Vancocin-related assets, as well as estimated useful lives, at such time.

Impairment losses

During the first quarter of 2009, the market capitalization of ViroPharma fell below the carrying value of ViroPharmas net
assets due to the announcements surrounding our maribavir development program. This situation required us to test for impairment of our goodwill and other intangible assets which lead to a goodwill impairment charge of $65.1 million.

During 2009 and 2008, we incurred impairment charges related to our previous corporate headquarters of $3.4 million and $2.3 million, respectively due to
the down turn in the real estate market.



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Other Income (Expense)

Interest Income

Interest
income for year ended December 31, 2009 was $0.4 million as compared to $14.3 million in 2008. Interest income in 2009 as compared to 2008 decreased due to lower amounts of cash on hand and lower interest rates.

Interest Expense

We
adopted the new accounting provisions for our convertible debt securities as of January 1, 2009 and retrospectively applied this change in accounting to all prior periods presented for which we had applicable outstanding convertible debt, as
required by this new standard. The adoption is discussed further in Note 3 of the Consolidated Financial Statements.



|                                             |  |                                 |        |      |   |       
|-------------------------------------------- |  | ------------------------------- | ------ | ---- | - | ------
|                                             |  | For the years endedDecember 31,
|(in thousands)                               |  | 2009                            |        | 2008
|Interest expense on senior convertible notes |  | $                               | 4,343  |      | $ | 4,980 
|Amortization of debt discount                |  |                                 | 6,854  |      |   | 7,181 
|Amortization of finance costs                |  |                                 | 412    |      |   | 790   
|                                             |  |                                 |        |      |   |       
|Total interest expense                       |  | $                               | 11,609 |      | $ | 12,951
|                                             |  |                                 |        |      |   |       

Interest expense and amortization of finance costs in 2009 and 2008
relates entirely to the senior convertible notes issued on March 26, 2007, as described in Note 9 to the Consolidated Financial Statements.

Income Tax Expense

Our income tax expense was $41.0 million and $16.0 million for
the year ended December 31, 2009 and 2008, respectively. Our income tax expense includes federal, state and foreign income taxes at statutory rates and the effects of various permanent differences. The income tax expense for 2009 reflects the
full impact of our gain on the repurchase of a portion of our convertible notes. In addition, our tax expense for the year includes our current estimate of the impact of the orphan drug credit for maribavir. The increase in the 2009 expense as
compared to 2008 is primarily due to the decrease in our orphan drug qualified expenses, offset by the decrease in our taxable income from 2008.

During the twelve months ended December 31, 2009, we paid approximately $1.2 million as a result of the IRS audit of our 2006 federal income tax return and results in a reduction of our taxes payable liability. We also have various
state returns currently under audit. The final outcome of these audits are not yet determinable.

Results of Operations

We adopted the new accounting provisions for our convertible debt securities as of January 1, 2009 and retrospectively applied
this change in accounting to all prior periods presented for which we had applicable outstanding convertible debt, as required by this new standard. The adoption is discussed further in Note 3 of the Consolidated Financial Statements.



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Years ended December 31, 2008 and 2007



|                                                         |  |                                 |         |      |   |        
|-------------------------------------------------------- |  | ------------------------------- | ------- | ---- | - | -------
|                                                         |  | For the years endedDecember 31,
|(in thousands, except per share data)                    |  | 2008                            |         | 2007
|Net product sales                                        |  | $                               | 232,307 |      | $ | 203,770
|Cost of sales (excluding amortization of product rights) |  | $                               | 8,874   |      | $ | 8,934  
|Operating income                                         |  | $                               | 78,655  |      | $ | 115,796
|Net income                                               |  | $                               | 63,960  |      | $ | 92,105 
|Net income per share:                                    |  |                                 |         |      |   |        
|Basic                                                    |  | $                               | 0.90    |      | $ | 1.32   
|Diluted                                                  |  | $                               | 0.84    |      | $ | 1.21   

The decrease in net income for 2008
resulted primarily from a $65.7 million increase in operating expenses and a $10.0 million decrease in interest income, offset by the $28.5 million increase in sales. The $37.1 million decrease in operating income resulted from the increased costs
to support our CMV and NTCD development programs and increase intangible amortization expense related to our acquisition of Cinryze product rights. Additionally, we incurred costs related to the product launch of Cinryze and the continuation of the
Cinryze open label trial. The year ended December 31, 2008 includes $8.9 million share-based compensation expense and $4.0 million of costs associated with our opposition to the OGDs change in approach, compared to $7.6 million for
share-based compensation expense and $3.3 million of costs associated with our opposition to the OGDs change in approach for the year ended December 31, 2007.

Revenues

Revenues consisted of the following:



|                  |  |                                 |         |      |   |        
|----------------- |  | ------------------------------- | ------- | ---- | - | -------
|                  |  | For the years endedDecember 31,
|(in thousands)    |  | 2008                            |         | 2007
|Net product sales |  | $                               | 232,307 |      | $ | 203,770

Revenue

We sell Vancocin only to wholesalers who then distribute the product to pharmacies, hospitals and long-term care facilities, among
others. Our sales of Vancocin are influenced by wholesaler forecasts of prescription demand, wholesaler buying decisions related to their desired inventory levels, and, ultimately, end user prescriptions, all of which could be at different levels
from period to period.

We sell Cinryze to specialty pharmacy/ specialty distributors (SP/SDs) who then distribute to physicians,
hospitals and patients, among others. We have recognized revenue related to shipments of Cinryze from the SP/SDs to patients who have had Cinryze approved by the healthcare providers. Shipments as of December 31, 2008 to SP/SDs
(less shipments to patients) are classified as deferred revenue on our consolidated financial statements.

During the year ended
December 31, 2008, net sales of Vancocin increased 14.0% compared to the same period in 2007 primarily due to an increase of units sold and the impact of a price increase during 2008.

Approximately 94% of our sales are to three wholesalers. Vancocin product sales are influenced by prescriptions and wholesaler forecasts of prescription
demand, which could be at different levels from period to period. We receive inventory data from our three largest wholesalers through our fee for service agreements. We do not independently verify this data. Based on this inventory data and our
estimates, we believe that as of December 31, 2008, the wholesalers did not have excess channel inventory.



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Cost of sales (excluding amortization of product rights)

Vancocin and Cinryze cost of sales includes the cost of materials and distribution costs and excludes amortization of product rights. Since units are shipped
based upon earliest expiration date, our cost of sales will be impacted by the cost associated with the specific units that are sold. Additionally, we may experience fluctuations in quarterly manufacturing yields and if this occurs, we would expect
the cost of product sales of Vancocin to fluctuate from quarter to quarter.

Research and development expenses

For each of our research and development programs, we incur both direct and indirect expenses. Direct expenses include third party costs
related to these programs such as contract research, consulting, cost sharing payments or receipts, and preclinical and development costs. Indirect expenses include personnel, facility, stock compensation and other overhead costs.

Research and development expenses were divided between our research and development programs in the following manner:



|                                            |  |                                 |        |      |   |       
|------------------------------------------- |  | ------------------------------- | ------ | ---- | - | ------
|                                            |  | For the years endedDecember 31,
|(in thousands)                              |  | 2008                            |        | 2007
|DirectCore programs                        |  |                                 |        |      |   |       
|CMV                                         |  | $                               | 35,200 |      | $ | 22,068
|Cinryze                                     |  |                                 | 5,226  |      |   |      
|Non-toxigenic strains of C. difficle (NTCD) |  |                                 | 4,702  |      |   | 1,023 
|Vancocin                                    |  |                                 | 603    |      |   | 14    
|HCV                                         |  |                                 | 762    |      |   | 951   
|Indirect                                    |  |                                 |        |      |   |       
|Development                                 |  |                                 | 17,941 |      |   | 9,869 
|                                            |  |                                 |        |      |   |       
|Total                                       |  | $                               | 64,434 |      | $ | 33,925
|                                            |  |                                 |        |      |   |       

Direct ExpensesCore Development Programs

Our direct expenses related to our CMV program increased significantly during 2008 as we advanced through our two Phase 3 clinical studies.
Specifically, we continued and in May 2008 completed recruitment into the phase 3 study of maribavir in patients undergoing allogeneic stem cell transplant at transplant centers in the U.S., Canada and several European countries. Data collection for
the six month assessments continued through the end of November 2008. We also continued enrollment in our Phase 3 clinical study of maribavir in patients receiving liver transplantation in the U.S. and Europe. During 2007 we continued recruitment
into a Phase 3 study of maribavir in patients undergoing allogeneic stem cell transplant, began recruiting patients into a second Phase 3 study of maribavir in liver transplant patients, and began executing on our pre-launch plans for our clinical,
regulatory and commercial activities for the maribavir program in Europe.

Related to our HCV program, costs in the 2008 primarily represent
those paid to Wyeth in connection with our cost-sharing arrangement related to discovery efforts to identify potential back-ups/follow-on compounds to HCV-796. During 2007, costs included continued recruitment in the 500 mg BID arms of a phase 2
study of HCV-796 when dosed in combination with pegylated interferon and ribavirin and ongoing follow-up of patients in that study. In April 2008, we announced that ViroPharma and Wyeth, have jointly discontinued the development of HCV-796 due to
the previously announced safety issue that emerged in the ongoing Phase 2 trial in patients with hepatitis C. In the third quarter of 2009 the collaboration agreement expired pursuant to its terms.



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In October 2008, we acquired Cinryze, a C1 inhibitor, which has been approved by the FDA for routine
prophylaxis of hereditary angioedema (HAE) also known as C1 inhibitor deficiency, a rare, severely debilitating, life-threatening genetic disorder. During 2008, we incurred costs related to the open label trial for additional product and patient
follow-up.

The increase in costs of NTCD in 2008 over 2007 relate to increased research and development activities and the costs associated
with manufacturing NTCD spores.

Related to our Vancocin program, costs in 2008 and 2007 related to additional research activities.

Anticipated fluctuations in future direct expenses are discussed under Liquidity Development
Programs.

Direct ExpensesNon-core Development Programs

We incurred minimal direct costs related to our common cold program licensed to Merck.

Indirect Expenses

These
costs primarily relate to the compensation of and overhead attributable to our development team. The increase in 2008 as compared to 2007 is primarily due to increased personnel costs of $6.1 million resulting from additional hiring in the US and EU
to support our clinical studies of maribavir and prepare for a regulatory submission and commercial expenses to support a potential future product launch.

Selling, general and administrative expenses

Selling, general and administrative
(SG&A) expenses increased 28.3 million in 2008 to $67.3 million from 39.0 million in 2007. For 2008, the largest contributors to these increases was additional headcount for the addition of our European operations and the Vancocin
sales force ($12.6 million), medical education activities ($8.1 million) and marketing efforts ($4.5 million).

Included in SG&A are legal
and consulting costs incurred related to our opposition to the attempt by the OGD regarding the conditions that must be met in order for a generic drug application to request a waiver of in-vivo bioequivalence testing for copies of Vancocin, which
were $4.0 million in the year 2008 as compared to $3.3 million the same period in 2007. We anticipate that these additional legal and consulting costs will continue at higher levels in future periods.

Intangible amortization and acquisition of technology rights

Intangible amortization is the result of the Vancocin product rights acquisition in the fourth quarter of 2004, as well as the acquisition of Lev in October 2008. Additionally, as described in our
agreement with Lilly, to the extent that we incur an obligation to Lilly for additional payments on Vancocin sales, we have contingent consideration. We record the obligation as an adjustment to the carrying amount of the related intangible asset
and a cumulative adjustment to the intangible amortization upon achievement of the related sales milestones. Contingent consideration and Lilly related additional payments are more fully described in Note 6 of the Consolidated Financial Statements.

Intangible amortization for the years ended December 31, 2008 and 2007 were $10.8 million and $6.1 million respectively. The
comparatives are impacted by cumulative adjustments for contingent consideration paid to Lilly, which were $1.0 million in 2008 and $0.6 million in 2007, and the amortization of Cinryze product rights from the date of the Lev acquisition to
December 31, 2008.

On an ongoing periodic basis, we evaluate the useful life of these intangible assets and determine if any economic,
governmental or regulatory event has modified their estimated useful lives. This evaluation did not result in a change in the life of the intangible assets during the year ended December 31, 2008. We will continue



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to monitor the actions of the OGD and consider the effects of our opposition efforts and the announcements by generic competitors or other adverse events for additional impairment indicators and
we will reevaluate the expected cash flows and fair value of our Vancocin-related assets, as well as estimated useful lives, at such time.

Impairment loss

During 2008, we incurred a $2.3 million impairment related to our previous
Corporate Headquarters that is classified as held for sale at December 31, 2008.

Other Income (Expense)

Interest Income

Interest income for the years ended December 31, 2008 and 2007 was $14.3 million and $24.3 million, respectively. Interest income decreased primarily due to lower interest rates in 2008 as well as decreased short-term investments
during 2008.

Interest Expense

Interest expense and amortization of finance costs in 2008 and 2007 relates entirely to the senior convertible notes issued on March 26, 2007, as described in Note 9 to the Consolidated Financial
Statements.

Income Tax Expense

Our effective income tax rate was 20.1% and 29.4% for the years ended December 31, 2008 and 2007, respectively. Income tax expense includes federal, state and foreign income taxes at statutory rates
and the effects of various permanent differences. The decrease in the 2008 rate as compared to 2007 is primarily due to the impact of the orphan drug credit for maribavir. Additionally, in connection with our acquisition of Lev, we reduced our
valuation allowance by $63.1 million to recognize deferred tax assets due to recognition of deferred tax liabilities in connection with our acquisition of Lev.

Liquidity

We expect that our sources of revenue will continue to arise from Cinryze
and Vancocin product sales. However, we cannot predict what the actual sales of Vancocin will be in the future based on the number of generic competitors that could enter the market if approved by the FDA, the timing of entry into the market of
those generic competitors and/or the sales we may generate from an authorized generic version of Vancocin. In addition, there are no assurances that demand for Vancocin will continue at historical or current levels.

Our ability to generate positive cash flow is also impacted by the timing of anticipated events in our Cinryze, NTCD and CMV programs, including the timing
of our expansion as we intend to seek to commercialize Cinryze in Europe and certain other countries, the scope of the clinical trials required by regulatory authorities, results from clinical trials, the results of our product development efforts,
and variations from our estimate of future direct and indirect expenses.

The cash flows we have used in operations historically have been
applied to research and development activities, marketing and business development efforts, general and administrative expenses, servicing our debt, and income tax payments. Bringing drugs from the preclinical research and development stage through
phase 1, phase 2, and phase 3 clinical trials and FDA approval is a time consuming and expensive process. Because the majority of our product candidates are currently in the clinical stage of development, there are a variety of events that could
occur during the development process that will dictate the course we must take with our drug development efforts and the cost of these efforts. As a result, we cannot reasonably estimate the costs that we will incur through the commercialization of
any product candidate. However, we anticipate we will continue to invest in



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our pipeline on our initiative to develop non-toxigenic strains of C. difficile, our phase 4 program for Cinryze, and our maribavir program, future costs may exceed current costs. Also, we will
incur additional costs as we intend to seek to commercialize Cinryze in Europe in countries we have distribution rights and certain other countries beginning in 2011 as well as conduct studies to identify additional C1 mediated diseases which may be
of interest for further clinical development, and to evaluate new forms of administration for Cinryze. Additionally, our operating expenses will not decrease significantly due to the introduction of copies of generic Vancocin. We are also required
to pay contingent consideration to Lev shareholders upon certain regulatory and commercial milestones. The most significant of our near-term operating development cash outflows are as described under Development Programs as
set forth below.

While we anticipate that cash flows from Cinryze and Vancocin, as well as our current cash and cash equivalents, will allow
us to fund substantially all of our ongoing development and operating costs, as well as the interest payments on our senior convertible notes, we may need additional financing in order to expand our product portfolio. At December 31, 2009, we
had cash and cash equivalents of $331.7 million.

Overall Cash Flows

During the year ended December 31, 2009, we were provided with $84.8 million of net cash from operating activities, primarily from our operating income
plus our non-cash items such as our goodwill impairment, depreciation and amortization expense and our deferred tax provision, partially offset by changes in working capital, specifically increases in accounts receivable and inventory due to the
Cinryze launch. We used $8.9 million of cash for investing activities primarily related to the additional purchase price consideration for Vancocin and our net cash used in financing activities for the year ended December 31, 2009 was $20.5
million, mainly for the repurchase of a portion of our senior convertible notes.

Direct ExpensesDevelopment Programs

For each of our development programs, we incur both direct and indirect expenses. Direct expenses include third party costs related to
these programs such as contract research, consulting, cost sharing payments or receipts, and preclinical and clinical development costs. Indirect expenses include personnel, facility and other overhead costs. Additionally, for some of our
development programs, we have cash inflows and outflows upon achieving certain milestones.

Core Development Programs

CinryzeWe acquired Cinryze in October 2008 and through December 31, 2009 have spent approximately $12.3 million in
direct research and development costs related to Cinryze since acquisition. During 2010, we continue to expect research and development costs related to Cinryze as we complete our Phase 4 commitment. Additionally, we will incur costs related to
evaluating additional indications, formulations and territories as we develop our life cycle program related to Cinryze. We are solely responsible for the costs of Cinryze development.

NTCDWe acquired NTCD in February 2006 and through December 31, 2009 have spent approximately $16.3 million in direct research and development costs. During 2010, we expect our
research and development activities related to NTCD to increase significantly as we commenced clinical studies with NTCD during the third quarter of 2009.

CMV programFrom the date we in-licensed maribavir through December 31, 2009, we paid $98.5 million of direct costs in connection with this program, including the acquisition fee of $3.5
million paid to GSK for the rights to maribavir in September 2003 and a $3.0 million milestone payment in February 2007.

During 2010, we will
continue to analyze the study results for the Phase 3 trials evaluating maribavir used as prophylaxis in stem cell and bone marrow transplant patients that did not achieve their primary endpoints.



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Should we achieve certain product development events, we are obligated to make certain milestone payments to
GSK, the licensor of maribavir.

VancocinWe acquired Vancocin in November 2004 and through December 31, 2009, we have spent
approximately $1.7 million in direct research and development costs related to Vancocin activities since acquisition.

HCV
programIn April 2008, we along with Wyeth, discontinued the development of HCV-796 due to the previously announced safety issue that emerged in the ongoing Phase 2 trial in patients with hepatitis C. Additionally, we announced that
ViroPharma and Wyeth do not expect to continue to collaborate on future development of hepatitis C treatment candidates and the agreement expired in accordance with its terms during the third quarter of 2009.

Business development activities

On October 21, 2008, we completed our acquisition under which ViroPharma acquired Lev Pharmaceuticals, Inc. (Lev). Lev is a biopharmaceutical company focused on developing and commercializing therapeutic products for the treatment of
inflammatory diseases. The terms of the merger agreement provided for the conversion of each share of Lev common stock into upfront consideration of $453.1 million, or $2.75 per Lev share, comprised of $2.25 per share in cash and $0.50 per share in
ViroPharma common stock, and contingent consideration of up to $1.00 per share which may be paid on achievement of certain regulatory and commercial milestones. As of December 31, 2009, only one of the contingent consideration payments is still
achievable which is $0.50 per Lev share. We used approximately $385 million of existing cash and cash equivalents to fund the acquisition, including deal related expenses, and issued 7,359,667 shares in conjunction with the merger.

We intend to seek to acquire additional products or product candidates. The costs associated with evaluating or acquiring any additional product or product
candidate can vary substantially based upon market size of the product, the commercial effort required for the product, the products current stage of development, and actual and potential generic and non-generic competition for the product,
among other factors. Due to the variability of the cost of evaluating or acquiring business development candidates, it is not feasible to predict what our actual evaluation or acquisition costs would be, if any, however, the costs could be
substantial.

Senior Convertible Notes

On March 26, 2007, we issued $250.0 million of 2% senior convertible notes due March 2017 (the senior convertible notes) in a public offering. Net proceeds from the issuance of the
senior convertible notes were $241.8 million. The senior convertible notes are unsecured unsubordinated obligations and rank equally with any other unsecured and unsubordinated indebtedness. The senior convertible notes bear interest at a
rate of 2% per annum, payable semi-annually in arrears on March 15 and September 15 of each year commencing on September 15, 2007.

We adopted the new accounting provisions for our convertible debt securities as of January 1, 2009 and retrospectively applied this change in accounting to all prior periods presented for which we had applicable outstanding convertible
debt, as required by this new standard. Under this new method of accounting, the debt and equity components of our convertible debt securities are bifurcated and accounted for separately. Under this new method of accounting, the convertible
debt securities will recognize interest expense at effective rates of 8.0% as they are accreted to par value. See Note 3 of the Consolidated Financial Statements for further explanation.

On March 24, 2009, we repurchased, in a privately negotiated transaction, $45.0 million in principal amount of our senior convertible notes due March 2017 for total consideration of approximately
$21.2 million. The repurchase represented 18% of our then outstanding debt and was executed at a price equal to 47% of par value.



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Following these repurchases, senior convertible notes representing $205.0 million of principal debt are outstanding with a carrying value of $138.6 million as of December 31, 2009.
Additionally, in negotiated transactions, we sold approximately 2.38 million call options for approximately $1.8 million and repurchased approximately 2.38 million warrants for approximately $1.5 million which terminated the call options
and warrants that were previously entered into by us in March 2007. We recognized a $9.1 million gain in the first quarter of 2009 as a result of this debt extinguishment. For tax purposes, the gain qualifies for deferral until 2014 in
accordance with the provisions of the American Recovery and Reinvestment Act.

As of December 31, 2009, we have accrued $1.2 million in
interest payable to holders of the senior convertible notes. Debt issuance costs of $4.8 million have been capitalized and are being amortized over the term of the senior convertible notes, with the balance to be amortized as of
December 31, 2009 being $2.8 million.

The senior convertible notes are convertible into shares of our common stock at an initial
conversion price of $18.87 per share. The senior convertible notes may only be converted: (i) anytime after December 15, 2016; (ii) during the five business-day period after any five consecutive trading day period (the
measurement period) in which the price per note for each trading day of that measurement period was less than 98% of the product of the last reported sale price of our common stock and the conversion rate on each such day;
(iii) during any calendar quarter (and only during such quarter) after the calendar quarter ending June 30, 2007, if the last reported sale price of our common stock for 20 or more trading days in a period of 30 consecutive trading days
ending on the last trading day of the immediately preceding calendar quarter exceeds 130% of the applicable conversion price in effect on the last trading day of the immediately preceding calendar quarter; or (iv) upon the occurrence of
specified corporate events. Upon conversion, holders of the senior convertible notes will receive shares of common stock, subject to our option to irrevocably elect to settle all future conversions in cash up to the principal amount of the senior
convertible notes, and shares for any excess. We can irrevocably elect this option at any time on or prior to the 35th scheduled trading day prior to the maturity date of the senior convertible notes. The senior convertible notes may be
required to be repaid on the occurrence of certain fundamental changes, as defined in the senior convertible notes. As of December 31, 2009, the fair value of the principal of the $205.0 million convertible senior notes outstanding
was approximately $149.4 million, based on the level 2 valuation hierarchy of the fair value measurements standard.

Concurrent with the
issuance of the senior convertible notes, we entered into privately-negotiated transactions, comprised of purchased call options and warrants sold, to reduce the potential dilution of our common stock upon conversion of the senior convertible
notes. The transactions, taken together, have the effect of increasing the initial conversion price to $24.92 per share. The net cost of the transactions was $23.3 million.

The call options allowed ViroPharma to receive up to approximately 13.25 million shares of its common stock at $18.87 per share from the call option holders, equal to the number of shares of common
stock that ViroPharma would issue to the holders of the senior convertible notes upon conversion. These call options will terminate upon the earlier of the maturity dates of the related senior convertible notes or the first day all of the
related senior convertible notes are no longer outstanding due to conversion or otherwise. Concurrently, we sold warrants to the warrant holders to receive shares of its common stock at an exercise price of $24.92 per share. These warrants
expire ratably over a 60-day trading period beginning on June 13, 2017 and will be net-share settled.

The purchased call options are
expected to reduce the potential dilution upon conversion of the senior convertible notes in the event that the market value per share of our common stock at the time of exercise is greater than $18.87, which corresponds to the initial conversion
price of the senior convertible notes, but less than $24.92 (the warrant exercise price). The warrant exercise price is 75.0% higher than the price per share of $14.24 of the our on the pricing date. If the market price per share of our common
stock at the time of conversion of any senior convertible notes is above the strike price of the purchased call options ($18.87), the purchased call options will entitle us to receive from the counterparties in the aggregate the same number of
shares of our common stock as we would be required to issue to the holder of the converted senior convertible notes. Additionally, if the market



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price of our common stock at the time of exercise of the sold warrants exceeds the strike price of the sold warrants ($24.92), we will owe the counterparties an aggregate of approximately 13.25
million shares of our common stock. If we have insufficient shares of common stock available for settlement of the warrants, we may issue shares of a newly created series of preferred stock in lieu of our obligation to deliver common
stock. Any such preferred stock would be convertible into 10% more shares of our common stock than the amount of common stock we would otherwise have been obligated to deliver under the warrants. We are entitled to receive approximately
10.87 million shares of its common stock at $18.87 from the call option holders and if the market price of our common stock at the time of exercise of the sold warrants exceeds the strike price of the sold warrants ($24.92), will owe the
counterparties an aggregate of approximately 10.87 million shares of our common stock.

The purchased call options and sold warrants are
separate transactions entered into by us with the counterparties, are not part of the terms of the senior convertible notes, and will not affect the holders rights under the senior convertible notes. Holders of the senior convertible notes
will not have any rights with respect to the purchased call options or the sold warrants. The purchased call options and sold warrants meet the definition of derivatives. These instruments have been determined to be indexed to our own stock and
have been recorded in stockholders equity in our Consolidated Balance Sheet. As long as the instruments are classified in stockholders equity they are not subject to the mark to market requirements of US GAAP.

From time to time, we make seek approval from our board of directors to evaluate additional opportunities to repurchase our common stock or convertible
notes, including through open market purchases or individually negotiated transactions.

Contractual Obligations

Future contractual obligations and commercial commitments at December 31, 2009 are as follows:

(in thousands)

|                               |  |       |         |               |   |           |  |           |         |                  |   |         |  |   |        
|------------------------------ |  | ----- | ------- | ------------- | - | --------- |  | --------- | ------- | ---------------- | - | ------- |  | - | -------
|Contractual Obligations (1)(2) |  | Total |         | 1 year orless |   | 2-3 years |  | 4-5 years |         | More than5 years
|Operating leases (3)           |  | $     | 12,438  |               | $ | 1,656     |  | $         | 3,581   |                  | $ | 3,731   |  | $ | 3,470  
|Senior convertible notes (4)   |  |       | 235,750 |               |   | 4,100     |  |           | 8,200   |                  |   | 8,200   |  |   | 215,250
|Collobration agreements (5)    |  |       | 7,165   |               |   | 1,433     |  |           | 2,866   |                  |   | 2,866   |  |   |       
|Purchase obligations (6)       |  |       | 371,025 |               |   | 62,591    |  |           | 115,668 |                  |   | 126,992 |  |   | 65,774 
|                               |  |       |         |               |   |           |  |           |         |                  |   |         |  |   |        
|Total                          |  | $     | 626,378 |               | $ | 69,780    |  | $         | 130,315 |                  | $ | 141,789 |  | $ | 284,494
|                               |  |       |         |               |   |           |  |           |         |                  |   |         |  |   |        



|(1) | This table does not include any milestone payments under our agreement with GSK in relation to our in-licensed technology, as the timing and likelihood of such payments
are not known. Similarly, it does not include any additional payments due to Lilly in connection with the Vancocin acquisition, as the amount and timing of future additional payments are not determinable. Under the terms of the agreement with Lilly,
Lilly is entitled to additional payments of 35% of annual net sales between $45 and $65 million of Vancocin during 2010 and 2011.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

No additional payments are due to Lilly on net sales of Vancocin below or above the net sales levels reflected above. We account for purchase price consideration as contingent consideration and will
record an adjustment to the carrying amount of the related intangible asset and a cumulative adjustment to the intangible amortization upon achievement of the related sales milestones. Assuming the maximum threshold is met at the end of each year,
the cumulative amortization adjustment would be $1.6 million, $2.1 million and $2.7 million in the years ended December 31, 2010, 2011 and 2012, respectively.

In the event we develop any product line extensions, revive discontinued vancomycin product lines (injectable or oral solution), make improvements of existing products, or expand the label to cover new
indications, Lilly would receive an additional royalty on net sales on these additional products for a predetermined time period.



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Finally, the table does not include additional payments to Lev CVR holders. As of
December 31, 2009, only the second CVR as described below remains achievable. The first CVR payment was $0.50 per share (or $87.5 million). During the fourth quarter of 2009, a third partys human C1 inhibitor product was approved for the
acute treatment of HAE and granted orphan exclusivity, therefore the first CVR is no longer achievable and will not be paid. The second CVR payment of $0.50 per share ($87.5 million) becomes payable if Cinryze reaches at least $600 million in
cumulative net product sales within 10 years of closing of the acquisition.

|(2) | This table does not include various agreements that we have entered into for services with third party vendors, including agreements to conduct clinical trials, to
manufacture product candidates, and for consulting and other contracted services due to the cancelable nature of the services. We accrue the costs of these agreements based on estimates of work completed to date. We estimate that approximately $23.0
million will be payable in future periods under arrangements in place at December 31, 2009. Of this amount, approximately $4.2 million has been accrued for work estimated to have been completed as of December 31, 2009 and approximately
$18.8 million relates to future performance under these arrangements.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(3) | Operating leases represent building and equipment leases.
|--- | ---------------------------------------------------------

|(4) | These payments represent interest and principal related to our 2% senior convertible notes due March 2017.
|--- | ----------------------------------------------------------------------------------------------------------

|(5) | Pursuant to the terms of the ROW Agreement, Sanquin may conduct certain early stage research programs for which we will provide to Sanquin
1,000,000 (approximately $1.4 million) per year for a period of five years.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(6) | In conjunction with our acquisition of Lev, we acquired purchase obligations related to the supply and manufacturing of Cinryze. We have committed to purchase up to
140,000 liters of plasma per year through 2015 from our supplier. Additionally, we are required to purchase a minimum number of units from our third party toll manufacturer. Excluded from these amounts is the manufacturing fee for Cinryze produced
under the EU and ROW agreement as the minimum purchase shall be determined by the Joint Steering Committee in 2013. Also, the additional 5.0 million (approximately $7.2 million) loan that will be made to Sanquin in 2010 has been excluded
from the table above.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Capital Resources

While we anticipate that revenues from Vancocin and Cinryze will continue to generate positive cash flow and should allow us to fund substantially all of our ongoing development and other operating costs,
we may need additional financing in order to expand our product portfolio. Should we need financing, we would seek to access the public or private equity or debt markets, enter into additional arrangements with corporate collaborators to whom we may
issue equity or debt securities or enter into other alternative financing arrangements that may become available to us.

Financing

If we raise additional capital by issuing equity securities, the terms and prices for these financings may be
much more favorable to the new investors than the terms obtained by our existing stockholders. These financings also may significantly dilute the ownership of existing stockholders.

If we raise additional capital by accessing debt markets, the terms and pricing for these financings may be much more favorable to the new lenders than the terms obtained from our prior lenders. These
financings also may require liens on certain of our assets that may limit our flexibility.

Additional equity or debt financing, however, may
not be available on acceptable terms from any source as a result of, among other factors, our operating results, our inability to achieve regulatory approval of any of our product candidates, our inability to generate revenue through our existing
collaborative agreements, and our inability to file, prosecute, defend and enforce patent claims and or other intellectual property rights. If sufficient additional financing is not available, we may need to delay, reduce or eliminate current
development programs, or reduce or eliminate other aspects of our business.



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Critical Accounting Policies

Our consolidated financial statements and accompanying notes are prepared in accordance with accounting principles generally accepted in the United States of
America. Preparing consolidated financial statements requires us to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses and contingent assets and liabilities. Actual results could differ from
such estimates. These estimates and assumptions are affected by the application of our accounting policies. Critical policies and practices are both most important to the portrayal of a companys financial condition and results of operations,
and require managements most difficult, subjective or complex judgments, often as a result of the need to make estimates about the effects of matters that are inherently uncertain.

Our summary of significant accounting policies is described in Note 2 to our Consolidated Financial Statements contained in our Annual Report on Form 10-K for the year ended December 31, 2009.
However, we consider the following policies and estimates to be the most critical in understanding the more complex judgments that are involved in preparing our consolidated financial statements and that could impact our results of operations,
financial position, and cash flows:



| |  |  | Product SalesOur net sales consist of revenue from sales of our products, Vancocin and Cinryze, less estimates for chargebacks, rebates,
distribution service fees, returns and losses. We recognize revenue for product sales when title and risk of loss has passed to the customer, which is typically upon delivery to the customer, when estimated provisions for chargebacks, rebates,
distribution service fees, returns and losses are reasonably determinable, and when collectability is reasonably assured. Revenue from the launch of a new or significantly unique product may be deferred until estimates can be made for chargebacks,
rebates and losses and all of the above conditions are met and when the product has achieved market acceptance, which is typically based on dispensed prescription data and other information obtained during the period following launch.
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | At the end of each reporting period we analyze our estimated channel inventory and we would defer recognition of revenue on product that has been
delivered if we believe that channel inventory at a period end is in excess of ordinary business needs. Further, if we believe channel inventory levels are increasing without a reasonably correlating increase in prescription demand, we proactively
delay the processing of wholesaler orders until these levels are reduced.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

We establish accruals for
chargebacks and rebates, sales discounts and product returns. These accruals are primarily based upon the history of Vancocin and for Cinryze they are based on information on payees obtained from our SP/SDs and CinryzeSolutions. We also
consider the volume and price of our products in the channel, trends in wholesaler inventory, conditions that might impact patient demand for our product (such as incidence of disease and the threat of generics) and other factors.

In addition to internal information, such as unit sales, we use information from external resources, which we do not verify, to estimate the
Vancocin channel inventory. Our external resources include prescription data reported by IMS Health Incorporated and written and verbal information obtained from our three largest wholesaler customers with respect to their inventory levels. Based
upon this information, we believe that inventory held at these warehouses are within normal levels.

Chargebacks and rebates
are the most subjective sales related accruals. While we currently have no contracts with private third party payors, such as HMOs, we do have contractual arrangements with governmental agencies, including Medicaid. We establish accruals for
chargebacks and rebates related to these contracts in the period in which we record the sale as revenue. These accruals are based upon historical experience of government agencies market share, governmental contractual prices, our current
pricing and then-current laws, regulations and interpretations. We analyze the accrual at least quarterly and adjust the balance as needed. We believe that if our estimates of the rate of chargebacks and rebates as a percentage of annual gross sales
were incorrect by 5%, our operating income and accruals would be impacted by approximately $1.5 million in the period of correction, which we believe is immaterial.



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Annually, as part of our process, we performed an analysis on the share of Vancocin and
Cinryze sales that ultimately go to Medicaid recipients and result in a Medicaid rebate. As part of that analysis, we considered our actual Medicaid historical rebates processed, total units sold and fluctuations in channel inventory. We also
consider our payee mix for Cinryze based on information obtained at the time of prescription.

Product return accruals are
estimated based on Vancocins history of damage and product expiration returns and are recorded in the period in which we record the sale of revenue. Cinryze has a no returns policy.



| |  |  | Impairment of Long-lived AssetsWe review our fixed and intangible assets for possible impairment annually and whenever events occur or
circumstances indicate that the carrying amount of an asset may not be recoverable. Assumptions and estimates used in the evaluation of impairment may affect the carrying value of long-lived assets, which could result in impairment charges in future
periods. Such assumptions include, for example, projections of future cash flows and the timing and number of generic/competitive entries into the market, in determining the undiscounted cash flows, and if necessary, the fair value of the asset and
whether an impairment exists. These assumptions are subjective and could result in a material impact on operating results in the period of impairment. While we reviewed our intangible assets in March 2006 and December 2008 in light of the actions
taken by the OGD, we did not recognize any impairment charges. See Note 6 of the Consolidated Financial Statements for further information. Additionally in the fourth quarter of 2009, we reviewed the fair value of our property and building held for
sale and have determined that an additional impairment charge was required. See Note 5 of the Consolidated Financial Statements for further information.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

On an ongoing periodic basis, we evaluate the useful life of intangible assets and determine if any economic, governmental or regulatory event has modified their estimated useful lives. While we reviewed
the useful life of our intangible assets in March 2006 and December 2008 in light of the actions taken by the OGD, we did not change the useful life of our intangible assets. See Note 6 of the Consolidated Financial Statements for further
information.

On August 4, 2009 the FDAs Pharmaceutical Science and Clinical Pharmacology Advisory Committee voted
in favor of the OGDs 2008 draft guidelines on bioequivalence for Vancocin. If FDAs proposed bioequivalence method for Vancocin becomes effective, the time period in which a generic competitor could be approved would be reduced and
multiple generics may enter the market, which would materially impact our operating results, cash flows and possibly intangible asset valuations. This could also result in a reduction to the useful life of the Vancocin-related intangible assets.
Management currently believes there are no indicators that would require a change in useful life as management believes that Vancocin will continue to be utilized along with generics that may enter the market, and the number of generics and the
timing of their market entry is unknown.

A reduction in the useful life, as well as the timing and number of generics, will
impact our cash flow assumptions and estimate of fair value, perhaps to a level that could result in an impairment charge. We will continue to monitor the actions of the OGD and consider the effects of our opposition actions and any announcements by
generic competitors or other adverse events for additional impairment indicators. We will reevaluate the expected cash flows and fair value of our Vancocin-related assets at such time a triggering event occurs.



| |  |  | Impairment of Goodwill We reviewed the carrying value of goodwill, to determine whether impairment may exist. Based on accounting standards, it
is required that goodwill be assessed annually for impairment using fair value measurement techniques, unless a triggering event occurs between annual assessments which would then require an assessment at the end of the quarter in which a triggering
event occurred.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

During the first quarter of 2009, our market capitalization dropped below the carrying value
of our net assets due to the results of our Phase 3 trial evaluating maribavir used as prophylaxis in allogeneic stem



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cell or bone marrow transplant patients. We concluded that the drop in our market cap was a triggering event which required us to perform an impairment test of our intangible assets and a step 2
test for goodwill impairment. As part of this process, we also assessed our intangible and fixed assets for impairment. Based on the analysis performed under step two, there was no remaining implied value attributable to goodwill and accordingly, we
wrote off the entire goodwill balance and recognized a goodwill impairment charge in the first quarter of 2009.



| |  |  | Share-Based Employee CompensationThe calculation of this expense includes judgment related to the period of time used in calculating the
volatility of our common stock, the amount of forfeitures and an estimate of the exercising habits of our employees, which is also influenced by our Insider Trading Policy. Changes in the volatility of our common stock or the habits of our employees
could result in variability in the fair value of awards granted.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Income TaxesOur annual effective tax rate is based on expected pre-tax earnings, existing statutory tax rates, limitations on the use of tax
credits and net operating loss carryforwards, evaluation of qualified expenses related to the orphan drug credit and tax planning opportunities available in the jurisdictions in which we operate. Significant judgment is required in determining our
annual effective tax rate.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

On a periodic basis, we evaluate the realizability of our deferred tax assets and
liabilities and will adjust such amounts in light of changing facts and circumstances, including but not limited to future projections of taxable income, the reversal of deferred tax liabilities, tax legislation, rulings by relevant tax authorities,
tax planning strategies and the progress of ongoing tax examinations. We recognize the benefit of tax positions that we have taken or expect to take on the income tax returns we file if such tax position is more likely than not of being sustained.
Settlement of filing positions that may be challenged by tax authorities could impact our income taxes in the year of resolution.

In assessing the realizability of deferred tax assets, we consider whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent
upon the generation of future taxable income during the period in which those temporary differences becomes deductible or the NOLs and credit carryforwards can be utilized. When considering the reversal of the valuation allowance, we consider the
level of past and future taxable income, the reversal of deferred tax liabilities, the utilization of the carryforwards and other factors. Revisions to the estimated net realizable value of the deferred tax asset could cause our provision for income
taxes to vary significantly from period to period.



| |  |  | Acquisition Accounting Businesses acquired before December 31, 2008 were accounted for in accordance with SFAS No. 141, Business
Combinationsand the total purchase price was allocated to Levs net tangible assets or identifiable intangible assets based on their fair values as of the date of the acquisition. The application of the purchase accounting requires certain
estimates and assumptions especially concerning the determination of the fair values of the acquired intangible assets and property, plant and equipment as well as the liabilities assumed at the date of the acquisition. Moreover, the useful lives of
the acquired intangible assets, property, plant and equipment have to be determined.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Businesses acquired
subsequent to January 1, 2009 will be accounted for in accordance with the new accounting standards regarding business combinations. Under the new standards, the total purchase price will be allocated to the net tangible assets or identifiable
intangible assets based on their fair values as of the date of the acquisition. Additionally, acquired IPR&D projects will initially be capitalized and considered indefinite-lived assets subject to annual impairment reviews or more often upon
the occurrence of certain events. For those compounds that reach commercialization, the assets are amortized over the expected useful lives.

Measurement of fair value and useful lives are based to a large extent on anticipated cash flows. If actual cash flows vary from those used in calculating fair values, this may significantly affect our



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future results of operations. In particular, the estimation of discounted cash flows of intangible assets of newly developed products is subject to assumptions closely related to the nature of
the acquired products. Factors that may affect the assumptions regarding future cash flows:



| |  |  | long-term sales forecasts,
| | - |  | --------------------------



| |  |  | anticipation of selling price erosion after the end of orphan exclusivity due to follow-on biologic competition in the market,
| | - |  | ------------------------------------------------------------------------------------------------------------------------------



| |  |  | behavior of competitors (launch of competing products, marketing initiatives etc.).
| | - |  | -----------------------------------------------------------------------------------

For significant acquisitions, the purchase price allocation is carried out with assistance from independent third-party valuation
specialists. The valuations are based on information available at the acquisition date.

As our business evolves, we may face additional
issues that will require increased levels of management estimation and complex judgments.

Recently Issued Accounting
Pronouncements

In October 2009, the FASB issued ASU No. 2009-13, Multiple-Deliverable Revenue Arrangements, or ASU 2009-13. ASU
2009-13, amends existing revenue recognition accounting pronouncements that are currently within the scope of FASB ASC Topic 605. This consensus provides accounting principles and application guidance on how the arrangement should be separated, and
the consideration allocated. This guidance changes how to determine the fair value of undelivered products and services for separate revenue recognition. Allocation of consideration is now based on managements estimate of the selling price for
an undelivered item where there is no other means to determine the fair value of that undelivered item. This new approach is effective prospectively for revenue arrangements entered into or materially modified in fiscal years beginning on or after
June 15, 2010.

On December 29, 2009, the FASB issued a proposed Accounting Standards Update to address potential practice issues
associated with FASB ASC Topic 855, Subsequent Events. The proposed ASU would no longer require entities that file or furnish financial statements with the SEC to disclose the date through which subsequent events have been evaluated in originally
issued and reissued financial statements. The proposed ASU has a 30-day comment period that ends January 28, 2010 and based on the proposal, final guidance would be effective on issuance. Accordingly, we will adopt the guidance when finalized.

Off-Balance Sheet Arrangements

In conjunction with our acquisition of Lev, we acquired purchase obligations related to the supply and manufacturing of Cinryze. We have committed to purchase a minimum number of liters of plasma per year
through 2015 from our supplier. Additionally, we are required to purchase a minimum number of units from our third party toll manufacturer. In October 2009, we terminated our agreement with Plasma Centers of America (PCA) and our obligation to
purchase plasma collected from centers own by PCA. The total minimum purchase commitments for these continuing arrangements as of December 31, 2009 are approximately $371.0 million.



|ITEM 7A. | QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
|-------- | ----------------------------------------------------------

Our holdings of financial instruments are primarily comprised of money mark funds holding only U.S. government securities. All such instruments are classified as securities available for sale. Our debt
security portfolio represents funds held temporarily pending use in our business and operations. We manage these funds accordingly. Our primary investment objective is the preservation of principal, while at the same time optimizing the generation
of investment income. We seek reasonable assuredness of the safety of principal and market liquidity by investing in cash equivalents (such as Treasury bills and money market funds) and fixed income securities (such as U.S. government and agency
securities, municipal securities, taxable municipals, and corporate notes) while at the same time seeking to achieve a favorable rate of return. Our market risk exposure



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consists principally of exposure to changes in interest rates. Our holdings are also exposed to the risks of changes in the credit quality of issuers. Historically, we have typically invested in
financial instruments with maturities of less than one year. The carrying amount, which approximates fair value, and the annualized weighted average nominal interest rate of our investment portfolio at December 31, 2009, was approximately
$323.7 million and 0.03%, respectively. A one percent change in the interest rate would have resulted in a $0.8 million impact to interest income for the quarter ended December 31, 2009.

At December 31, 2009, we had principal outstanding of $205.0 million of our senior convertible notes. The senior convertible notes bear interest at a
rate of 2% per annum, payable semi-annually in arrears on March 15 and September 15 of each year commencing on September 15, 2007. The senior convertible notes are convertible into shares of our common stock at an initial
conversion price of $18.87 per share. The senior convertible notes may only be converted: (i) anytime after December 15, 2016; (ii) during the five business-day period after any five consecutive trading day period (the
measurement period) in which the price per note for each trading day of that measurement period was less than 98% of the product of the last reported sale price of our common stock and the conversion rate on each such day;
(iii) during any calendar quarter (and only during such quarter) after the calendar quarter ending June 30, 2007, if the last reported sale price of our common stock for 20 or more trading days in a period of 30 consecutive trading days
ending on the last trading day of the immediately preceding calendar quarter exceeds 130% of the applicable conversion price in effect on the last trading day of the immediately preceding calendar quarter; or (iv) upon the occurrence of
specified corporate events. Upon conversion, holders of the senior convertible notes will receive shares of common stock, subject to our option to irrevocably elect to settle all future conversions in cash up to the principal amount of the senior
convertible notes, and shares for any excess. We can irrevocably elect this option at any time on or prior to the 35th scheduled trading day prior to the maturity date of the senior convertible notes. The senior convertible notes may be required to
be repaid on the occurrence of certain fundamental changes, as defined in the senior convertible notes. As of December 31, 2009, the fair value of the principal of the $205.0 million convertible senior notes outstanding was approximately
$149.4 million, based on the level 2 valuation hierarchy of the fair value measurements standard.

In connection with the issuance of the
senior convertible senior notes, we have entered into privately-negotiated transactions with two counterparties (the counterparties), comprised of purchased call options and warrants sold. These transactions are expected to generally
reduce the potential equity dilution of our common stock upon conversion of the senior convertible notes. These transactions expose us to counterparty credit risk for nonperformance. We manage our exposure to counterparty credit risk through
specific minimum credit standards, and diversification of counterparties.



|ITEM 8. | FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA
|------- | -------------------------------------------

Our financial statements required by this item are attached to this Report beginning on page 71.



|ITEM 9. | CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE
|------- | ------------------------------------------------------------------------------------

Not Applicable.



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|ITEM 9A. | CONTROLS AND PROCEDURES
|-------- | -----------------------

Evaluation of Disclosure Controls and Procedures

An evaluation was performed under the supervision and with the
participation of our management, including our Chief Executive Officer, or CEO, and our Chief Financial Officer, or CFO, of the effectiveness of our disclosure controls and procedures, as such term is defined under Rule 13a-15(e) promulgated under
the Securities Exchange Act of 1934, as amended (the Exchange Act), as of December 31, 2009. Based on that evaluation, our management, including our CEO and CFO, concluded that as of December 31, 2009 our disclosure controls
and procedures were effective to ensure that information required to be disclosed by us in reports that we file or submit under the Exchange Act, is recorded, processed, summarized and reported within the time periods specified in the rules and
forms of the Securities and Exchange Commission and that such information is accumulated and communicated to the Companys management, including our CEO and CFO, as appropriate to allow timely decisions regarding required disclosure.

Changes in Internal Control over Financial Reporting

During the quarter ended December 31, 2009, there were no significant changes in our internal control over financial reporting identified in connection
with the evaluation of such controls that occurred during our most recent fiscal quarter that have materially affected, or is reasonably likely to materially affect our internal control over financial reporting.

Management Report on Internal Control over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting. Our internal control system was designed to provide reasonable assurance to the
companys management and board of directors regarding the preparation and fair presentation of published consolidated financial statements. Internal control over financial reporting is defined in Rule 13a-15(f) or 15d-15(f) promulgated under
the Exchange Act as a process designed by, or under the supervision of, our principal executive and principal financial officers and effected by our board of directors, management and other personnel, to provide reasonable assurance regarding the
reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles and includes those policies and procedures that:



| |  |  | pertain to the maintenance of records that in reasonable detail accurately and fairly reflect the transactions and dispositions of the assets of the
company;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally
accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of the companys assets that
could have a material effect on the financial statements.
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Our management, including our Chief Executive Officer and Chief
Financial Officer, do not expect that our internal control over financial reporting will prevent all error and all fraud. A control system, no matter how well designed and implemented, can provide only reasonable, not absolute, assurance that the
control systems objectives will be met. Further, the design of a control system must reflect the fact that there are resource constraints, and the benefits of controls must be considered relative to their costs. Because of the inherent
limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues within a company are detected. The inherent limitations include the realities that judgments in decision-making can be faulty, and
that breakdowns can occur because of simple errors or mistakes. Controls can also be



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circumvented by the individual acts of some persons, by collusion of two or more people or by management override of the controls. Because of the inherent limitations in a cost-effective control
system, misstatements due to error or fraud may occur and may not be detected.

Our management assessed the effectiveness of its internal
control over financial reporting as of December 31, 2009. In making this assessment, it used the criteria based on the framework set forth by the Committee of Sponsoring Organizations of the Treadway Commission in Internal
ControlIntegrated Framework (COSO). Based on our assessments we believe that, as of December 31, 2009, our internal control over financial reporting is effective based on those criteria.

Our independent registered public accounting firm, KPMG LLP, has issued a report on the effectiveness of the Companys internal control over financial
reporting appears on the next page.



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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Stockholders

ViroPharma Incorporated:

We have audited ViroPharma Incorporateds (the Companys) internal control over financial
reporting as of December 31, 2009, based on criteria established in Internal ControlIntegrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Companys management is responsible
for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management Report on Internal Control over Financial Reporting.
Our responsibility is to express an opinion on the effectiveness of the Companys internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective
internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and
evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audit also included performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a
reasonable basis for our opinion.

A companys internal control over financial reporting is a process designed to provide reasonable
assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A companys internal control over financial reporting
includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable
assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with
authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the companys assets that could have a material
effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect
misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may
deteriorate.

In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of
December 31, 2009, based on criteria established in Internal ControlIntegrated Framework issued by COSO.

We also have audited, in
accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of the Company as of December 31, 2009 and 2008, and the related consolidated statements of operations,
comprehensive income (loss), stockholders equity and cash flows for each of the years in the three-year period ended December 31, 2009, and our report dated February 24, 2010 expressed an unqualified opinion on those consolidated
financial statements.

/s/ KPMG LLP

Short Hills, New Jersey

February 24, 2010



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|ITEM 9B. | OTHER INFORMATION
|-------- | -----------------

Not Applicable.

PART III



|ITEM 10. | DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE
|-------- | ------------------------------------------------------

The information concerning our directors and regarding compliance with Section 16 of the Securities Exchange Act of 1934 required by this Item will be set forth in our Proxy Statement, to be filed
within 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K, and is incorporated by reference to our Proxy Statement.

The information concerning our executive officers required by this Item is incorporated by reference herein to the section of this Annual Report in Part I entitled Executive Officers of the Registrant.

Our Board of Directors has adopted a code of business conduct and ethics that applies to our principal executive officers, principal financial officer, and
controller, as well as all other employees. A copy of this code of business conduct and ethics has been posted on our Internet website at www.viropharma.com under the investingcorporate governance section. In addition, hard copies can
be obtained free of charge through our investor relations department. Any amendments to, or waivers from, a provision of our code of ethics that applies to our principal executive officer, principal financial officer, controller, or persons
performing similar functions and that relate to any element of the code of ethics enumerated in paragraph (b) of Item 406 of Regulation S-K shall be disclosed by posting such information on our website.

The information concerning our corporate governance required by this Item will be set forth in our Proxy Statement, to be filed within 120 days after the
end of the fiscal year covered by this Annual Report on Form 10-K, and is incorporated by reference to our Proxy Statement.



|ITEM 11. | EXECUTIVE COMPENSATION
|-------- | ----------------------

The information
required by this Item will be set forth in our Proxy Statement, to be filed within 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K, and is incorporated by reference to our Proxy Statement.



|ITEM 12. | SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS
|-------- | ----------------------------------------------------------------------------------------------

The information required by this Item will be set forth in our Proxy Statement, to be filed within 120 days after the end of the fiscal year covered by this
Annual Report on Form 10-K, and is incorporated by reference to our Proxy Statement.



|ITEM 13. | CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE
|-------- | -------------------------------------------------------------------------

The information required by this Item will be set forth in our Proxy Statement, to be filed within 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K, and is incorporated
by reference to our Proxy Statement.



|ITEM 14. | PRINCIPAL ACCOUNTING FEES AND SERVICES
|-------- | --------------------------------------

The information required by this Item will be set forth in our Proxy Statement, to be filed within 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K, and is incorporated by reference to our Proxy
Statement.



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PART IV



|ITEM 15. | EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
|-------- | ------------------------------------------



|            |  |                                                                                                                                                                                                                                                                                                                            
|----------- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Exhibit No. |  | Description                                                                                                                                                                                                                                                                                                                
|            | 
|3.1*        |  | Amended and Restated Certificate of Incorporation of the Company, as amended by a Certificate of Amendment of Amended and Restated Certificate of Incorporation dated May 18, 1999,
as further amended by a Certificate of Amendment of Amended and Restated Certificate of Incorporation dated May 24, 2000. (Exhibit 3.1)
|            | 
|3.2         |  | Amended and Restated By-Laws of the Company. (2) (Exhibit 3.3)                                                                                                                                                                                                                                                             
|            | 
|4.1         |  | Form of Indenture dated March 19, 2007 between the Company and Wilmington Trust Company, as Trustee. (21) (Exhibit 4.1)                                                                                                                                                                                                    
|            | 
|4.2         |  | First Supplemental Indenture, dated as of March 26, 2007, by and between the Company and Wilmington Trust Company, as Trustee. (21) (Exhibit 4.2)                                                                                                                                                                          
|            | 
|10.1      |  | Form of Employment Agreement. (14) (Exhibit 10.1)                                                                                                                                                                                                                                                                          
|            | 
|10.2        |  | Form of Indemnification Agreement. (14) (Exhibit 10.2)                                                                                                                                                                                                                                                                     
|            | 
|10.3        |  | Investment Agreement among ViroPharma Incorporated and Perseus-Soros Biopharmaceutical Fund, L.P. dated May 5, 1999. (5) (Exhibit 10.20)                                                                                                                                                                                   
|            | 
|10.5       |  | First Amended and Restated Agreement dated February 27, 2001 between Sanofi-Synthelabo and ViroPharma Incorporated. (7) (Exhibit 10.32)                                                                                                                                                                                    
|            | 
|10.6      |  | 2001 Equity Incentive Plan. (8) (Exhibit 10.33)                                                                                                                                                                                                                                                                            
|            | 
|10.12      |  | License Agreement dated August 8, 2003 by and between GlaxoSmithKline and ViroPharma Incorporated. (4) (Exhibit 10.35)                                                                                                                                                                                                     
|            | 
|10.13      |  | Letter Agreement dated November 24, 2003 between Sanofi-Synthelabo and the Company. (9) (Exhibit 10.34)                                                                                                                                                                                                                    
|            | 
|10.14      |  | Assignment, Transfer and Assumption Agreement between ViroPharma Incorporated and Eli Lilly and Company dated October 18, 2004.(10) (Exhibit 2.1)                                                                                                                                                                          
|            | 
|10.15      |  | Amendment No. 1 to the Assignment, Transfer and Assumption Agreement between ViroPharma Incorporated and Eli Lilly and Company dated November 8, 2004.(10) (Exhibit
2.2)                                                                                                                                                   
|            | 
|10.16      |  | License Agreement between ViroPharma Incorporated and Schering Corporation dated November 3, 2004. (11) (Exhibit 2.1)                                                                                                                                                                                                      
|            | 
|10.17     |  | ViroPharma Severance Plan. (14) (Exhibit 10.37)                                                                                                                                                                                                                                                                            
|            | 
|10.18     |  | ViroPharma Cash Bonus Plan. (22) (Exhibit 10.2)                                                                                                                                                                                                                                                                            
|            | 
|10.19     |  | ViroPharma Board Compensation Policy.(31) (Exhibit 10.19)                                                                                                                                                                                                                                                                  
|            | 
|10.20     |  | Amended and Restated 1995 ViroPharma Stock Option and Restricted Share Plan. (13)                                                                                                                                                                                                                                          
|            | 
|10.21     |  | 2005 Equity Incentive Plan. (19)                                                                                                                                                                                                                                                                                           
|            | 
|10.22     |  | Form Of Non-Qualified Stock Option Agreement For Member Of The Board Of Director. (15) (Exhibit 10.2)                                                                                                                                                                                                                      
|            | 
|10.23     |  | Form Of Non-Qualified Stock Option Agreement. (15) (Exhibit 10.3)                                                                                                                                                                                                                                                          
|            | 
|10.24     |  | Form of Incentive Stock Option Agreement. (15) (Exhibit 10.4)                                                                                                                                                                                                                                                              



79



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|            |  |                                                                                                                                                                                                                                                              
|----------- |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Exhibit No. |  | Description                                                                                                                                                                                                                                                  
|            | 
|10.25      |  | Master Agreement by and between OSG Norwich Pharmaceuticals, Inc. and ViroPharma Incorporated effective as of December 1, 2005. (16) (Exhibit 10.41)                                                                                                         
|            | 
|10.26      |  | Project Agreement No. 1 by and between OSG Norwich Pharmaceuticals, Inc. and ViroPharma Incorporated. (16) (Exhibit 10.42)                                                                                                                                   
|            | 
|10.27      |  | Bulk Supply Agreement between ViroPharma and Alpharma Inc. dated April 13, 2006. (17) (Exhibit 10.1)                                                                                                                                                         
|            | 
|10.28      |  | Project Agreement No. 2 by and between OSG Norwich Pharmaceuticals, Inc. and ViroPharma Incorporated dated May 15, 2006. (17) (Exhibit 10.2)                                                                                                                 
|            | 
|10.29       |  | Real Estate Purchase Agreement between LV Associates, L.P. and the Company dated December 22, 2006. (22) (Exhibit 10.33)                                                                                                                                     
|            | 
|10.30       |  | Confirmation of Convertible Bond Hedge Transaction, dated as of March 20, 2007, by and between ViroPharma Incorporated and Credit Suisse International and Credit Suisse, New York
Branch, as agent for Credit Suisse International. (21) (Exhibit 10.1)     
|            | 
|10.31       |  | Confirmation of Convertible Bond Hedge Transaction, dated as of March 20, 2007, by and between ViroPharma Incorporated and Wells Fargo Bank, National Association. (21)
(Exhibit 10.2)                                                                       
|            | 
|10.32       |  | Confirmation of Issuer Warrant Transaction dated as of March 20, 2007, by and between ViroPharma Incorporated and Credit Suisse International and Credit Suisse, New York Branch, as
agent for Credit Suisse International. (21) (Exhibit 10.3))             
|            | 
|10.33       |  | Confirmation of Issuer Warrant Transaction, dated as of March 20, 2007, by and between ViroPharma Incorporated and Wells Fargo Bank, National Association.(21) (Exhibit
10.4)                                                                                
|            | 
|10.34       |  | Amendment to Confirmation of Issuer Warrant Transaction dated as of March 22, 2007, by and between ViroPharma Incorporated and Credit Suisse International and Credit Suisse, New
York Branch, as agent for Credit Suisse International. (21) (Exhibit 10.4))
|            | 
|10.35       |  | Amendment to Confirmation of Issuer Warrant Transaction, dated as of March 22, 2007, by and between ViroPharma Incorporated and Wells Fargo Bank, National Association. (21)
(Exhibit 10.5)                                                                  
|            | 
|10.36      |  | Amended and Restated Bulk Supply Agreement between ViroPharma and Alpharma Inc. dated October 26, 2007.(18) (Exhibit 10.38)                                                                                                                                  
|            | 
|10.37       |  | Agreement and Plan of Merger, dated as of July 15, 2008, by and among ViroPharma Incorporated, HAE Acquisition Corp., and Lev Pharmaceuticals, Inc. (3) (Exhibit
2.1)                                                                                        
|            | 
|10.38       |  | Form of Contingent Value Rights Agreement, by and among ViroPharma Incorporated, Lev Pharmaceuticals, Inc. and StockTrans, Inc. (3) (Exhibit 2.1)                                                                                                            
|            | 
|10.39     |  | Separation Agreement, dated July 15, 2008, by and between Lev Pharmaceuticals, Inc., ViroPharma Incorporated and Joshua Schein. (6) (Exhibit 10.5)                                                                                                           
|            | 
|10.40     |  | Separation Agreement, dated July 15, 2008, by and between Lev Pharmaceuticals, Inc., ViroPharma Incorporated and Judson Cooper. (6) (Exhibit 10.6)                                                                                                           
|            | 
|10.45      |  | Plasma Supply Agreement dated April 12, 2007 (24) (Exhibit 10.4)                                                                                                                                                                                             
|            | 
|10.46      |  | Agreement for the Purchase and Sale of Blood Plasma dated July 12, 2007 (25)(Exhibit 10.1)                                                                                                                                                                   
|            | 
|10.50       |  | Lease Agreement with 730 Stockton Drive Associates, L.P. dated March 14, 2008. (27) (Exhibit 10.1)                                                                                                                                                           



80



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|            |  |                                                                                                                                                                                                                                                                           
|----------- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Exhibit No. |  | Description                                                                                                                                                                                                                                                               
|            | 
|10.51     |  | Letter Agreement with Michel de Rosen dated March 30, 2008 (28) (Exhibit 10.1)                                                                                                                                                                                            
|            | 
|10.52     |  | Letter Agreement between the Company and Robert Pietrusko dated January 9, 2009 (22) (Exhibit 10.1)                                                                                                                                                                       
|            | 
|10.53       |  | Form of Partial Unwind Agreement with respect to the Note Hedge Transaction Confirmation between ViroPharma Incorporated and Credit Suisse International (32) (Exhibit
10.1)                                                                                              
|            | 
|10.54       |  | Form of Partial Unwind Agreement with respect to the Warrant Confirmation between ViroPharma Incorporated and Credit Suisse International (32) (Exhibit 10.2)                                                                                                             
|            | 
|10.55       |  | Form of Partial Unwind Agreement with respect to the Note Hedge Transaction Confirmation between ViroPharma Incorporated and Wells Fargo Bank, National Association (32)
(Exhibit 10.3)                                                                                   
|            | 
|10.56       |  | Form of Partial Unwind Agreement with respect to the Warrant Confirmation, dated July 11, 2007 between ViroPharma Incorporated and Wells Fargo Bank, National Association (32)
(Exhibit 10.4)                                                                             
|            | 
|10.57     |  | Amended and Restated ViroPharma Incorporated 2000 Employee Stock Purchase Plan. (33) (Annex A)                                                                                                                                                                            
|            | 
|10.58     |  | Form of Amended and Restated Change of Control Agreement with the Executive Officers. (34) (Exhibit 10.1)                                                                                                                                                                 
|            | 
|10.59     |  | Form of Amended and Restated Change of Control Agreement with the General Counsel. (34) (Exhibit 10.2)                                                                                                                                                                    
|            | 
|10.60      |  | Intermediate Supply Agreement with Biotest AG dated as of June 19, 2009 by and between ViroPharma SPRL, a wholly owned subsidiary of ViroPharma Incorporated , and Biotest AG. (35)
(Exhibit 10.1)                                                                        
|            | 
|10.62      |  | First Amendment to the Agreement for the Purchase and Sale of Blood Plasma, dated as of July 9, 2009 by and between ViroPharma Biologics, Inc., a wholly owned subsidiary of
ViroPharma Incorporated, and DCI Management Group LLC. (36) (Exhibit 10.1)                   
|            | 
|10.63*     |  | Manufacturing and Distribution Agreement (Europe and ROW) dated as of January 8, 2010, by and between ViroPharma SPRL, a wholly-owned subsidiary of ViroPharma Incorporated, and
Sanquin Bloedvoorziening (Sanquin Blood Supply Foundation)                               
|            | 
|10.64*     |  | Distribution and Manufacturing Services Agreement For the Americas and Israel dated as of January 8, 2010, by and between ViroPharma Biologics, Inc., a wholly-owned subsidiary of
ViroPharma Incorporated, and Sanquin Bloedvoorziening (Sanquin Blood Supply Foundation)
|            | 
|10.65*     |  | Exclusive License Agreement dated as of February 20, 2006 by and between ViroPharma Incorporated and Dale N. Gerding, M.D.                                                                                                                                                
|            | 
|14          |  | Code of Conduct and Ethics. (23)(Exhibit 14)                                                                                                                                                                                                                              
|            | 
|21*         |  | List of Subsidiaries.                                                                                                                                                                                                                                                     
|            | 
|23*         |  | Consent of KPMG LLP, Independent Registered Public Accounting Firm.                                                                                                                                                                                                       
|            | 
|24*         |  | Power of Attorney (included on signature page).                                                                                                                                                                                                                           
|            | 
|31.1*       |  | Certification by Chief Executive Officer pursuant to Rule 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.                                                                                                                  
|            | 
|31.2*       |  | Certification by Chief Financial Officer pursuant to Rule 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.                                                                                                                  
|            | 
|32.1*       |  | Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.                                                                                                                                                   



81



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|* | Filed herewith.
|- | ---------------

| | Portions of this exhibit were omitted and filed separately with the Secretary of the Commission pursuant to an application for confidential treatment filed with the
Commission pursuant to Rule 24b-2 under the Securities Exchange Act of 1934, as amended.
|- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | Compensation plans and arrangements for executives and others.
|-- | --------------------------------------------------------------

|(1) | Filed as an Exhibit to Registrants Form 10-Q for the quarter ended June 30, 2000.
|--- | ----------------------------------------------------------------------------------

|(2) | Filed as an Exhibit to the Companys Current Report on Form 8-K filed with the Commission on November 14, 2008.
|--- | ---------------------------------------------------------------------------------------------------------------

|(3) | Filed as an Exhibit to the Companys Current Report on Form 8-K filed with the Commission on July 18, 2008.
|--- | -----------------------------------------------------------------------------------------------------------

|(4) | Filed as an Exhibit to Registrants Form 10-Q for the quarter ended September 30, 2003.
|--- | ---------------------------------------------------------------------------------------

|(5) | Filed as an Exhibit to Registrants Form 10-Q for the quarter ended March 31, 1999.
|--- | -----------------------------------------------------------------------------------

|(6) | Filed as an Exhibit to the Current Report on Form 8-K filed with the Commission on July 18, 2008 by Lev Pharmaceuticals, Inc.
|--- | -----------------------------------------------------------------------------------------------------------------------------

|(7) | Filed as an Exhibit to Registrants Form 10-Q for the quarter ended March 31, 2001.
|--- | -----------------------------------------------------------------------------------

|(8) | Filed as an Exhibit to Registrants Form 10-K for the year ended December 31, 2001.
|--- | -----------------------------------------------------------------------------------

|(9) | Filed as an Exhibit to Registrants Current Report on Form 8-K filed with the Commission on April 11, 2008.
|--- | -----------------------------------------------------------------------------------------------------------

|(10) | Filed as an Exhibit to the Companys Current Report on Form 8-K/A filed with the Commission on November 24, 2004.
|---- | -----------------------------------------------------------------------------------------------------------------

|(11) | Filed as an Exhibit to the Companys Current Report on Form 8-K filed with the Commission on November 29, 2004.
|---- | ---------------------------------------------------------------------------------------------------------------

|(12) | Filed as an Exhibit to the Companys Current Report on Form 8-K filed with the Commission on February 15, 2005.
|---- | ---------------------------------------------------------------------------------------------------------------

|(13) | Filed as an Annex to Registrants Proxy Statement filed with the Commission on April 8, 2002.
|---- | ---------------------------------------------------------------------------------------------

|(14) | Filed as an Exhibit to Registrants Form 10-K for the year ended December 31, 2004.
|---- | -----------------------------------------------------------------------------------

|(15) | Filed as an Exhibit to Registrants Form 10-Q for the quarter ended June 30, 2005.
|---- | ----------------------------------------------------------------------------------

|(16) | Filed as an Exhibit to Registrants Form 10-K for the year ended December 31, 2005.
|---- | -----------------------------------------------------------------------------------

|(17) | Filed as an Exhibit to Registrants Form 10-Q for the quarter ended June 30, 2006.
|---- | ----------------------------------------------------------------------------------

|(18) | Filed as an Exhibit to Registrants Form 10-K for the year ended December 31, 2008.
|---- | -----------------------------------------------------------------------------------

|(19) | Field as Annex to Registrants Proxy Statement filed with the Commission on April 11, 2008.
|---- | -------------------------------------------------------------------------------------------

|(20) | Filed as an Exhibit to the Companys Registration Statement on Form S-3 (333-141411) filed with the Commission on March 19, 2007.
|---- | ---------------------------------------------------------------------------------------------------------------------------------

|(21) | Filed as an Exhibit to the Companys Current Report on Form 8-K filed with the Commission on March 26, 2007.
|---- | ------------------------------------------------------------------------------------------------------------

|(22) | Filed as an Exhibit to Registrants Current Report on Form 8-K filed with the Commission on January 8, 2009.
|---- | ------------------------------------------------------------------------------------------------------------

|(23) | Filed as an Exhibit to the Companys Current Report on Form 8-K filed with the Commission on February 24, 2010.
|---- | ---------------------------------------------------------------------------------------------------------------

|(24) | Filed as an Exhibit to Form 10-QSB/A filed by Lev Pharmaceuticals, Inc. on August 27, 2007.
|---- | -------------------------------------------------------------------------------------------

|(25) | Filed as an Exhibit to Form 8-K filed by Lev Pharmaceuticals, Inc. on July 25, 2007.
|---- | ------------------------------------------------------------------------------------

|(26) | Filed as an Exhibit to Form 10-Q filed by Lev Pharmaceuticals, Inc. on April 30, 2008.
|---- | --------------------------------------------------------------------------------------

|(27) | Filed as an Exhibit Registrants Form 10-Q for the quarter ended March 31, 2008.
|---- | --------------------------------------------------------------------------------

|(28) | Filed as an Exhibit to Registrants Current Report on Form 8-K filed with the Commission on April 3, 2008.
|---- | ----------------------------------------------------------------------------------------------------------

|(29) | Filed as an Exhibit to Form 10-KSB filed by Lev Pharmaceuticals, Inc. on March 31, 2006 .
|---- | -----------------------------------------------------------------------------------------

|(30) | Filed as an Exhibit to Form 10-KSB filed by Lev Pharmaceuticals, Inc. on March 31, 2006 .
|---- | -----------------------------------------------------------------------------------------

|(31) | Filed as an Exhibit to the Companys Annual Report on Form 10-K filed with the Commission on March 2, 2009.
|---- | -----------------------------------------------------------------------------------------------------------

|(32) | Filed as an Exhibit to the Companys Current Report on Form 8-K filed with the Commission on March 24, 2009.
|---- | ------------------------------------------------------------------------------------------------------------

|(33) | Field as Annex A to the Companys Proxy Statement filed with the Commission on April 10, 2009.
|---- | ----------------------------------------------------------------------------------------------



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|(34) | Filed as an Exhibit to the Companys Current Report on Form 8-K filed with the Commission on June 17, 2009.
|---- | -----------------------------------------------------------------------------------------------------------

|(35) | Filed as an Exhibit to the Companys Quarterly Report on Form 10-Q filed with the Commission on July 29, 2009.
|---- | --------------------------------------------------------------------------------------------------------------

|(36) | Filed as an Exhibit to the Companys Quarterly Report on Form 10-Q filed with the Commission on October 29, 2009.
|---- | -----------------------------------------------------------------------------------------------------------------

Copies of the exhibits are available to stockholders from Peter Wolf, Vice President, General Counsel and Secretary, ViroPharma Incorporated, 730
Stockton Drive, Exton, Pennsylvania 19341. There will be a fee to cover the Companys expenses in furnishing the exhibits.



83



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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed
on our behalf by the undersigned, thereunto duly authorized.



VIROPHARMA INCORPORATEDBy:

/s/    VINCENT J.
MILANOVincent J. MilanoPresident, Chief Executive Officer


POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below constitutes and appoints each of Vincent J. Milano and Charles A. Rowland, Jr. as his or her attorney-in-fact, with the full power of substitution, for him or her in any and all capacities, to sign any amendments to this Report, and to
file the same, with exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, hereby ratifying and confirming all that said attorney-in-fact, or his substitute or substitutes, may do or cause to be
done by virtue hereof.

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the
following persons on behalf of the registrant and in the capacities and on the dates indicated:



|                                                     |  |                                                                        |  |                  
|---------------------------------------------------- |  | ---------------------------------------------------------------------- |  | -----------------
|Name                                                 |  | Capacity                                                               |  | Date             
|                                                     |  |                                                                       
|/s/    VINCENT J.
MILANO                             |  | President, Chief Executive Officer (Principal Executive Officer)       |  | February 24, 2010
|Vincent J. Milano                                    |  |                                                                       
|                                                     |  |                                                                       
|/s/    CHARLES A. ROWLAND,
JR.                       |  | Chief Financial Officer (Principal Financial Officer)                  |  | February 24, 2010
|Charles A. Rowland, Jr.                              |  |                                                                       
|                                                     |  |                                                                       
|/s/    RICHARD S.
MORRIS Richard S. Morris           |  | Chief Accounting Officer and Controller (Principal Accounting Officer) |  | February 24, 2010
|                                                     |  |                                                                       
|/s/    VINCENT J.
MILANO Vincent J. Milano           |  | Chairman of the Board                                                  |  | February 24, 2010
|                                                     |  |                                                                       
|/s/    PAUL A. BROOKE Paul A. Brooke                 |  | Director                                                               |  | February 24, 2010
|                                                     |  |                                                                       
|/s/    WILLIAM CLAYPOOL,
M.D. William Claypool, M.D. |  | Director                                                               |  | February 24, 2010
|                                                     |  |                                                                       
|/s/    MICHAEL R.
DOUGHERTY Michael R. Dougherty     |  | Director                                                               |  | February 24, 2010
|                                                     |  |                                                                       
|/s/    ROBERT J.
GLASER Robert J. Glaser             |  | Director                                                               |  | February 24, 2010
|                                                     |  |                                                                       
|/s/    JOHN R.
LEONE John R. Leone                   |  | Director                                                               |  | February 24, 2010
|                                                     |  |                                                                       
|/s/    HOWARD H.
PIEN Howard H. Pien                 |  | Director                                                               |  | February 24, 2010
|                                                     |  |                                                                       
|/s/    FRANK BALDINO,
JR. Frank Baldino, Jr.         |  | Director                                                               |  | February 24, 2010



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VIROPHARMA INCORPORATED

INDEX TO CONSOLIDATED FINANCIAL STATEMENTS



|                                                                                                             |  |     
|------------------------------------------------------------------------------------------------------------ |  | ----
|                                                                                                             |  | Page
|Report of Independent Registered Public Accounting Firm                                                      |  | 86  
|Consolidated Balance Sheets at December 31, 2009 and December 31, 2008                                       |  | 87  
|Consolidated Statements of Operations for the years ended December 31, 2009, 2008 and
2007                   |  | 88  
|Consolidated Statements of Comprehensive Income (Loss) for the years ended December 
31, 2009, 2008 and 2007 |  | 89  
|Consolidated Statements of Stockholders Equity for the years ended December 
31, 2009, 2008 and 2007        |  | 90  
|Consolidated Statements of Cash Flows for the years ended December 31, 2009, 2008 and
2007                   |  | 91  
|Notes to the Consolidated Financial Statements                                                               |  | 92  



85



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##### Table of Contents

Report of Independent Registered Public Accounting Firm

The Board of Directors and Stockholders

ViroPharma Incorporated:

We have audited the accompanying consolidated balance sheets of ViroPharma Incorporated as of
December 31, 2009 and 2008, and the related consolidated statements of operations, comprehensive income (loss), stockholders equity and cash flows for each of the years in the three-year period ended December 31, 2009. These
consolidated financial statements are the responsibility of the Companys management. Our responsibility is to express an opinion on these consolidated financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we
plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial
statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for
our opinion.

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial
position of ViroPharma Incorporated as of December 31, 2009 and 2008, and the results of their operations and their cash flows for each of the years in the three-year period ended December 31, 2009, in conformity with U.S generally
accepted accounting principles.

As discussed in Notes 3 and 9 to the consolidated financial statements, the Company retrospectively changed
its method of accounting for convertible debt instruments that may be settled in cash upon conversion due to the adoption of a new accounting standard issued by the FASB, as of January 1, 2009.

As discussed in Note 15 to the consolidated financial statements, the Company changed its method of measuring the fair value of assets and liabilities as of
January 1, 2008.

As discussed in Note 13 to the consolidated financial statements, the Company changed its method of recognizing and
measuring the tax effects related to uncertain tax positions due to the adoption of a new accounting standard issued by the FASB, as of January 1, 2007.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the effectiveness of ViroPharma Incorporateds internal control over financial
reporting as of December 31, 2009, based on criteria established in Internal ControlIntegrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO), and our report dated February 24, 2010
expressed an unqualified opinion on the effective operation of internal control over financial reporting.

/s/ KPMG LLP

Short Hills, New Jersey

February 24, 2010



86



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ViroPharma Incorporated

Consolidated Balance Sheets



|                                                                                                                                                                                  |  |                  |           |                  |   |           |  
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ---------------- | --------- | ---------------- | - | --------- | -
|(in thousands, except share and per share data)                                                                                                                                   |  | December 31,2009 |           | December 31,2008 |  
|Assets                                                                                                                                                                            |  |                  |           |                  |   |           |  
|Current assets:                                                                                                                                                                   |  |                  |           |                  |   |           |  
|Cash and cash equivalents                                                                                                                                                         |  | $                | 331,672   |                  | $ | 275,839   |  
|Accounts receivable, net                                                                                                                                                          |  |                  | 41,243    |                  |   | 15,058    |  
|Inventory                                                                                                                                                                         |  |                  | 41,582    |                  |   | 27,168    |  
|Prepaid expenses and other current assets                                                                                                                                         |  |                  | 9,546     |                  |   | 5,120     |  
|Prepaid income taxes                                                                                                                                                              |  |                  | 2,256     |                  |   | 6,867     |  
|Property and building held for sale                                                                                                                                               |  |                  |          |                  |   | 6,734     |  
|Deferred income taxes                                                                                                                                                             |  |                  | 20,065    |                  |   | 24,094    |  
|                                                                                                                                                                                  |  |                  |           |                  |   |           |  
|Total current assets                                                                                                                                                              |  |                  | 446,364   |                  |   | 360,880   |  
|Intangible assets, net                                                                                                                                                            |  |                  | 618,510   |                  |   | 639,693   |  
|Property, equipment and building improvements, net                                                                                                                                |  |                  | 10,508    |                  |   | 6,853     |  
|Goodwill                                                                                                                                                                          |  |                  |          |                  |   | 65,099    |  
|Debt issue costs, net                                                                                                                                                             |  |                  | 2,784     |                  |   | 3,892     |  
|Other assets                                                                                                                                                                      |  |                  | 6,285     |                  |   | 9,712     |  
|                                                                                                                                                                                  |  |                  |           |                  |   |           |  
|Total assets                                                                                                                                                                      |  | $                | 1,084,451 |                  | $ | 1,086,129 |  
|                                                                                                                                                                                  |  |                  |           |                  |   |           |  
|Liabilities and Stockholders Equity                                                                                                                                              |  |                  |           |                  |   |           |  
|Current liabilities:                                                                                                                                                              |  |                  |           |                  |   |           |  
|Accounts payable                                                                                                                                                                  |  | $                | 5,866     |                  | $ | 5,719     |  
|Due to partners                                                                                                                                                                   |  |                  |          |                  |   | 1,278     |  
|Accrued expenses and other current liabilities                                                                                                                                    |  |                  | 33,354    |                  |   | 35,650    |  
|Income tax payable                                                                                                                                                                |  |                  | 769       |                  |   | 820       |  
|                                                                                                                                                                                  |  |                  |           |                  |   |           |  
|Total current liabilities                                                                                                                                                         |  |                  | 39,989    |                  |   | 43,467    |  
|Non-current income tax payable and other non-current liabilities                                                                                                                  |  |                  | 2,958     |                  |   | 4,071     |  
|Deferred tax liabilities                                                                                                                                                          |  |                  | 152,503   |                  |   | 128,254   |  
|Long-term debt                                                                                                                                                                    |  |                  | 138,614   |                  |   | 161,003   |  
|                                                                                                                                                                                  |  |                  |           |                  |   |           |  
|Total liabilities                                                                                                                                                                 |  |                  | 334,064   |                  |   | 336,795   |  
|                                                                                                                                                                                  |  |                  |           |                  |   |           |  
|Commitments and Contingencies                                                                                                                                                     |  |                  |           |                  |   |           |  
|                                                                                                                                                                                  |  |                 
|Stockholders equity:                                                                                                                                                             |  |                  |           |                  |   |           |  
|Preferred stock, par value $0.001 per share. 5,000,000 shares authorized; Series A convertible participating preferred stock; no
shares issued and outstanding                    |  |                  |          |                  |   |          |  
|Common stock, par value $0.002 per share. 175,000,000 shares authorized; issued and outstanding 77,442,716 shares at
December 31, 2009 and 77,397,621 shares at December 31, 2008 |  |                  | 156       |                  |   | 156       |  
|                                                                                                                                                                                  |  |                 
|Additional paid-in capital                                                                                                                                                        |  |                  | 701,063   |                  |   | 690,502   |  
|Accumulated other comprehensive gain (loss)                                                                                                                                       |  |                  | 914       |                  |   | (655      | )
|Retained earnings                                                                                                                                                                 |  |                  | 48,254    |                  |   | 59,331    |  
|                                                                                                                                                                                  |  |                  |           |                  |   |           |  
|Total stockholders equity                                                                                                                                                        |  |                  | 750,387   |                  |   | 749,334   |  
|                                                                                                                                                                                  |  |                  |           |                  |   |           |  
|Total liabilities and stockholders equity                                                                                                                                        |  | $                | 1,084,451 |                  | $ | 1,086,129 |  
|                                                                                                                                                                                  |  |                  |           |                  |   |           |  

See accompanying notes to consolidated financial statements.



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ViroPharma Incorporated

Consolidated Statements of Operations



|                                                         |  |                          |         |   |      |   |         |      |  |   |         |  
|-------------------------------------------------------- |  | ------------------------ | ------- | - | ---- | - | ------- | ---- |  | - | ------- | -
|                                                         |  | Years ended December 31, |        
|(in thousands, except per share data)                    |  | 2009                     |         |   | 2008 |   |         | 2007 | 
|Revenues:                                                |  |                          |         |   |      |   |         |      |  |   |         |  
|Net product sales                                        |  | $                        | 310,449 |   |      | $ | 232,307 |      |  | $ | 203,770 |  
|                                                         |  |                          |        
|Costs and Expenses:                                      |  |                          |         |   |      |   |         |      |  |   |         |  
|Cost of sales (excluding amortization of product rights) |  |                          | 40,214  |   |      |   | 8,874   |      |  |   | 8,934   |  
|Research and development                                 |  |                          | 52,083  |   |      |   | 64,434  |      |  |   | 33,925  |  
|Selling, general and administrative                      |  |                          | 89,316  |   |      |   | 67,270  |      |  |   | 38,995  |  
|Intangible amortization                                  |  |                          | 28,183  |   |      |   | 10,809  |      |  |   | 6,120   |  
|Goodwill impairment                                      |  |                          | 65,099  |   |      |   |        |      |  |   |        |  
|Impairment loss                                          |  |                          | 3,424   |   |      |   | 2,265   |      |  |   |        |  
|                                                         |  |                          |         |   |      |   |         |      |  |   |         |  
|Total costs and expenses                                 |  |                          | 278,319 |   |      |   | 153,652 |      |  |   | 87,974  |  
|                                                         |  |                          |         |   |      |   |         |      |  |   |         |  
|Operating income                                         |  |                          | 32,130  |   |      |   | 78,655  |      |  |   | 115,796 |  
|                                                         |  |                          |        
|Other Income (Expense):                                  |  |                          |         |   |      |   |         |      |  |   |         |  
|Interest income                                          |  |                          | 352     |   |      |   | 14,296  |      |  |   | 24,265  |  
|Interest expense                                         |  |                          | (11,609 | ) |      |   | (12,951 | )    |  |   | (9,612  | )
|Gain on long-term debt repurchase                        |  |                          | 9,079   |   |      |   |        |      |  |   |        |  
|                                                         |  |                          |         |   |      |   |         |      |  |   |         |  
|Income before income tax expense                         |  |                          | 29,952  |   |      |   | 80,000  |      |  |   | 130,449 |  
|                                                         |  |                          |        
|Income tax expense                                       |  |                          | 41,029  |   |      |   | 16,040  |      |  |   | 38,344  |  
|                                                         |  |                          |         |   |      |   |         |      |  |   |         |  
|Net (loss) income                                        |  |                          | (11,077 | ) |      |   | 63,960  |      |  |   | 92,105  |  
|                                                         |  |                          |         |   |      |   |         |      |  |   |         |  
|Net (loss) income per share:                             |  |                          |         |   |      |   |         |      |  |   |         |  
|Basic                                                    |  | $                        | (0.14   | ) |      | $ | 0.90    |      |  | $ | 1.32    |  
|Diluted                                                  |  | $                        | (0.14   | ) |      | $ | 0.84    |      |  | $ | 1.21    |  
|                                                         |  |                          |        
|Shares used in computing net (loss) income per share:    |  |                          |         |   |      |   |         |      |  |   |         |  
|Basic                                                    |  |                          | 77,423  |   |      |   | 71,391  |      |  |   | 69,827  |  
|Diluted                                                  |  |                          | 77,423  |   |      |   | 85,712  |      |  |   | 80,891  |  

See accompanying notes to
consolidated financial statements.



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ViroPharma Incorporated

Consolidated Statements of Comprehensive Income (Loss)



|                                                                                                                |  |                         |         |   |      |   |        |      |  |   |        |  
|--------------------------------------------------------------------------------------------------------------- |  | ----------------------- | ------- | - | ---- | - | ------ | ---- |  | - | ------ | -
|                                                                                                                |  | Year ended December 31, |        
|(in thousands)                                                                                                  |  | 2009                    |         |   | 2008 |   |        | 2007 | 
|Net (loss) income                                                                                               |  | $                       | (11,077 | ) |      | $ | 63,960 |      |  | $ | 92,105 |  
|                                                                                                                |  |                         |        
|Other comprehensive income:                                                                                     |  |                         |         |   |      |   |        |      |  |   |        |  
|Unrealized holding gains (losses) arising during period, net of income taxes of $300 in 2008 and $(326) in 2007 |  |                         |        |   |      |   | 550    |      |  |   | (608   | )
|Foreign currency translation adjustment                                                                         |  |                         | 1,569   |   |      |   | (659   | )    |  |   | 5      |  
|                                                                                                                |  |                         |         |   |      |   |        |      |  |   |        |  
|Comprehensive (loss) income                                                                                     |  | $                       | (9,508  | ) |      | $ | 63,851 |      |  | $ | 91,502 |  
|                                                                                                                |  |                         |         |   |      |   |        |      |  |   |        |  

See accompanying notes to consolidated financial statements



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ViroPharma Incorporated

Consolidated Statements of Stockholders Equity



|                                                               |                |                 |        |              |                |                          |        |  |                                   |     |  |                  |         |   |                          |   |       |   |  |   |         |   |  |   |         |  
|-------------------------------------------------------------- | -------------- | --------------- | ------ | ------------ | -------------- | ------------------------ | ------ |  | --------------------------------- | --- |  | ---------------- | ------- | - | ------------------------ | - | ----- | - |  | - | ------- | - |  | - | ------- | -
|(in thousands)                                                 |                | Preferred Stock |        | Common Stock |                | Additionalpaid-incapital |        |  | Accumulatedothercomprehensiveloss |     |  | RetainedEarnings |         |   | Totalstockholdersequity |  
|                                                               | Numberofshares |                 | Amount |              | Numberofshares |                          | Amount |  |                                   |     | 
|Balance, December 31, 2006                                     |                |                |        | $            |               |                          | 69,770 |  |                                   | 140 |  |                  | 508,436 |   |                          |   | 57    |   |  |   | (96,734 | ) |  |   | 411,899 |  
|Issuance of common stock                                       |                |                |        |              |               |                          | 22     |  |                                   |    |  |                  | 187     |   |                          |   |      |   |  |   |        |   |  |   | 187     |  
|Exercise of common stock options                               |                |                |        |              |               |                          | 113    |  |                                   |    |  |                  | 525     |   |                          |   |      |   |  |   |        |   |  |   | 525     |  
|Cost of call spread options, net                               |                |                |        |              |               |                          |       |  |                                   |    |  |                  | (23,250 | ) |                          |   |      |   |  |   |        |   |  |   | (23,250 | )
|Issuance of senior convertible notes (as adjusted, see Note 3) |                |                |        |              |               |                          |       |  |                                   |    |  |                  | 95,215  |   |                          |   |      |   |  |   |        |   |  |   | 95,215  |  
|Unrealized gains on available-for-sale securities              |                |                |        |              |               |                          |       |  |                                   |    |  |                  |        |   |                          |   | (608  | ) |  |   |        |   |  |   | (608    | )
|Share-based compensation                                       |                |                |        |              |               |                          |       |  |                                   |    |  |                  | 7,641   |   |                          |   |      |   |  |   |        |   |  |   | 7,641   |  
|Tax benefit on convertible note hedge                          |                |                |        |              |               |                          |       |  |                                   |    |  |                  | 4,507   |   |                          |   |      |   |  |   |        |   |  |   | 4,507   |  
|Stock option tax benefits                                      |                |                |        |              |               |                          |       |  |                                   |    |  |                  | 304     |   |                          |   |      |   |  |   |        |   |  |   | 304     |  
|Cumulative translation adjustment                              |                |                |        |              |               |                          |       |  |                                   |    |  |                  |        |   |                          |   | 5     |   |  |   |        |   |  |   | 5       |  
|Net income                                                     |                |                |        |              |               |                          |       |  |                                   |    |  |                  |        |   |                          |   |      |   |  |   | 92,105  |   |  |   | 92,105  |  
|                                                               |                |                 |        |              |                |                          |        |  |                                   |     |  |                  |         |   |                          |   |       |   |  |   |         |   |  |   |         |  
|Balance, December 31, 2007                                     |                |                |        |              |               |                          | 69,905 |  |                                   | 140 |  |                  | 593,565 |   |                          |   | (546  | ) |  |   | (4,629  | ) |  |   | 588,530 |  
|Issuance of common stock                                       |                |                |        |              |               |                          | 21     |  |                                   |    |  |                  | 180     |   |                          |   |      |   |  |   |        |   |  |   | 180     |  
|Exercise of common stock options                               |                |                |        |              |               |                          | 112    |  |                                   | 1   |  |                  | 359     |   |                          |   |      |   |  |   |        |   |  |   | 360     |  
|Unrealized gains on available-for-sale securities              |                |                |        |              |               |                          |       |  |                                   |    |  |                  |        |   |                          |   | 550   |   |  |   |        |   |  |   | 550     |  
|Share-based compensation                                       |                |                |        |              |               |                          |       |  |                                   |    |  |                  | 8,932   |   |                          |   |      |   |  |   |        |   |  |   | 8,932   |  
|Tax benefit on convertible note hedge                          |                |                |        |              |               |                          |       |  |                                   |    |  |                  | 1,262   |   |                          |   |      |   |  |   |        |   |  |   | 1,262   |  
|Stock option tax benefits                                      |                |                |        |              |               |                          |       |  |                                   |    |  |                  | 184     |   |                          |   |      |   |  |   |        |   |  |   | 184     |  
|Cumulative translation adjustment                              |                |                |        |              |               |                          |       |  |                                   |    |  |                  |        |   |                          |   | (659  | ) |  |   |        |   |  |   | (659    | )
|Acquisition of Lev Pharmaceuticals, Inc.                       |                |                |        |              |               |                          | 7,360  |  |                                   | 15  |  |                  | 86,020  |   |                          |   |      |   |  |   |        |   |  |   | 86,035  |  
|Net income                                                     |                |                |        |              |               |                          |       |  |                                   |    |  |                  |        |   |                          |   |      |   |  |   | 63,960  |   |  |   | 63,960  |  
|                                                               |                |                 |        |              |                |                          |        |  |                                   |     |  |                  |         |   |                          |   |       |   |  |   |         |   |  |   |         |  
|Balance, December 31, 2008                                     |                |                |        |              |               |                          | 77,398 |  |                                   | 156 |  |                  | 690,502 |   |                          |   | (655  | ) |  |   | 59,331  |   |  |   | 749,334 |  
|Exercise of common stock options                               |                |                |        |              |               |                          | 13     |  |                                   |    |  |                  | 22      |   |                          |   |      |   |  |   |        |   |  |   | 22      |  
|Employee stock purchase plan                                   |                |                |        |              |               |                          | 32     |  |                                   |    |  |                  | 356     |   |                          |   |      |   |  |   |        |   |  |   | 356     |  
|Share-based compensation                                       |                |                |        |              |               |                          |       |  |                                   |    |  |                  | 11,828  |   |                          |   |      |   |  |   |        |   |  |   | 11,828  |  
|Cumulative translation adjustment                              |                |                |        |              |               |                          |       |  |                                   |    |  |                  |        |   |                          |   | 1,569 |   |  |   |        |   |  |   | 1,569   |  
|Stock option tax benefits                                      |                |                |        |              |               |                          |       |  |                                   |    |  |                  | 44      |   |                          |   |      |   |  |   |        |   |  |   | 44      |  
|Termination of call spread options, net                        |                |                |        |              |               |                          |       |  |                                   |    |  |                  | 274     |   |                          |   |      |   |  |   |        |   |  |   | 274     |  
|Repurchase of conversion options on long-term debt             |                |                |        |              |               |                          |       |  |                                   |    |  |                  | (1,963  | ) |                          |   |      |   |  |   |        |   |  |   | (1,963  | )
|Net income                                                     |                |                |        |              |               |                          |       |  |                                   |    |  |                  |        |   |                          |   |      |   |  |   | (11,077 | ) |  |   | (11,077 | )
|                                                               |                |                 |        |              |                |                          |        |  |                                   |     |  |                  |         |   |                          |   |       |   |  |   |         |   |  |   |         |  
|Balance, December 31, 2009                                     |                |                |        | $            |               |                          | 77,443 |  | $                                 | 156 |  | $                | 701,063 |   |                          | $ | 914   |   |  | $ | 48,254  |   |  | $ | 750,387 |  
|                                                               |                |                 |        |              |                |                          |        |  |                                   |     |  |                  |         |   |                          |   |       |   |  |   |         |   |  |   |         |  

See accompanying notes to consolidated financial statements.



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ViroPharma Incorporated

Consolidated Statements of Cash Flows



|                                                                                         |  |                                  |         |   |      |   |          |      |  |   |          |  
|---------------------------------------------------------------------------------------- |  | -------------------------------- | ------- | - | ---- | - | -------- | ---- |  | - | -------- | -
|                                                                                         |  | For the years ended December 31, |        
|(in thousands)                                                                           |  | 2009                             |         |   | 2008 |   |          | 2007 | 
|Cash flows from operating activities:                                                    |  |                                  |         |   |      |   |          |      |  |   |          |  
|Net (loss) income                                                                        |  | $                                | (11,077 | ) |      | $ | 63,960   |      |  | $ | 92,105   |  
|Adjustments to reconcile net (loss) income to net cash provided by operating activities: |  |                                  |         |   |      |   |          |      |  |   |          |  
|Non-cash share-based compensation expense                                                |  |                                  | 11,817  |   |      |   | 8,938    |      |  |   | 7,600    |  
|Non-cash building impairment                                                             |  |                                  | 3,424   |   |      |   | 2,265    |      |  |   |         |  
|Non-cash interest expense                                                                |  |                                  | 7,291   |   |      |   | 7,888    |      |  |   | 2,462    |  
|Gain on long-term debt repurchase                                                        |  |                                  | (9,079  | ) |      |   |         |      |  |   |         |  
|Non-cash goodwill impairment                                                             |  |                                  | 65,099  |   |      |   |         |      |  |   |         |  
|Deferred tax provision                                                                   |  |                                  | 28,161  |   |      |   | 10,389   |      |  |   | 12,875   |  
|Depreciation and amortization expense                                                    |  |                                  | 29,660  |   |      |   | 11,989   |      |  |   | 6,924    |  
|Changes in assets and liabilities:                                                       |  |                                  |         |   |      |   |          |      |  |   |          |  
|Accounts receivable                                                                      |  |                                  | (26,000 | ) |      |   | 2,991    |      |  |   | (8,237   | )
|Inventory                                                                                |  |                                  | (13,622 | ) |      |   | (3,129   | )    |  |   | 57       |  
|Prepaid expenses and other current assets                                                |  |                                  | (4,447  | ) |      |   | 4,977    |      |  |   | (1,916   | )
|Prepaid income taxes/ income taxes payable                                               |  |                                  | 4,447   |   |      |   | (6,084   | )    |  |   | (23      | )
|Other assets                                                                             |  |                                  | 3,432   |   |      |   | (8,279   | )    |  |   | 10       |  
|Due to partners                                                                          |  |                                  | (1,278  | ) |      |   | 270      |      |  |   | 225      |  
|Accounts payable                                                                         |  |                                  | (211    | ) |      |   | 1,573    |      |  |   | (726     | )
|Accrued expenses and other current liabilities                                           |  |                                  | (2,456  | ) |      |   | (6,387   | )    |  |   | 10,378   |  
|Non-current income tax payable and other non-current liabilities                         |  |                                  | (382    | ) |      |   | 76       |      |  |   | 1,133    |  
|                                                                                         |  |                                  |         |   |      |   |          |      |  |   |          |  
|Net cash provided by operating activities                                                |  |                                  | 84,779  |   |      |   | 91,437   |      |  |   | 122,867  |  
|                                                                                         |  |                                  |        
|Cash flows from investing activities:                                                    |  |                                  |         |   |      |   |          |      |  |   |          |  
|Purchase of Lev Pharmaceuticals, Inc., net of cash acquired                              |  |                                  |        |   |      |   | (380,218 | )    |  |   |         |  
|Purchase of Vancocin assets                                                              |  |                                  | (7,000  | ) |      |   | (7,000   | )    |  |   | (5,950   | )
|Purchase of property, plant and equipment                                                |  |                                  | (1,929  | ) |      |   | (2,529   | )    |  |   | (8,866   | )
|Purchase of short-term investments                                                       |  |                                  |        |   |      |   |         |      |  |   | (789,707 | )
|Maturities of short-term investments                                                     |  |                                  |        |   |      |   | 405,187  |      |  |   | 588,347  |  
|                                                                                         |  |                                  |         |   |      |   |          |      |  |   |          |  
|Net cash (used in) provided by investing activities                                      |  |                                  | (8,929  | ) |      |   | 15,440   |      |  |   | (216,176 | )
|                                                                                         |  |                                  |        
|Cash flows from financing activities:                                                    |  |                                  |         |   |      |   |          |      |  |   |          |  
|Long-term debt repurchase                                                                |  |                                  | (21,150 | ) |      |   |         |      |  |   |         |  
|Repaymemt of acquired debt                                                               |  |                                  |        |   |      |   | (12,056  | )    |  |   |          |  
|Net proceeds from issuance of senior convertible notes                                   |  |                                  |        |   |      |   |         |      |  |   | 241,825  |  
|Net purchase of call spread options                                                      |  |                                  |        |   |      |   |         |      |  |   | (23,250  | )
|Termination of call spread options, net                                                  |  |                                  | 274     |   |      |   |         |      |  |   |         |  
|Net proceeds from issuance of common stock                                               |  |                                  | 378     |   |      |   | 540      |      |  |   | 712      |  
|Excess tax benefits from share-based payment arrangements                                |  |                                  | 44      |   |      |   | 184      |      |  |   | 304      |  
|Tax benefit on convertible note hedge                                                    |  |                                  |        |   |      |   | 1,262    |      |  |   | 1,880    |  
|                                                                                         |  |                                  |         |   |      |   |          |      |  |   |          |  
|Net cash (used in) provided by financing activities                                      |  |                                  | (20,454 | ) |      |   | (10,070  | )    |  |   | 221,471  |  
|Effect of exchange rate changes on cash                                                  |  |                                  | 437     |   |      |   | (659     | )    |  |   | 5        |  
|Net increase in cash and cash equivalents                                                |  |                                  | 55,833  |   |      |   | 96,148   |      |  |   | 128,167  |  
|Cash and cash equivalents at beginning of period                                         |  |                                  | 275,839 |   |      |   | 179,691  |      |  |   | 51,524   |  
|                                                                                         |  |                                  |         |   |      |   |          |      |  |   |          |  
|Cash and cash equivalents at end of period                                               |  | $                                | 331,672 |   |      | $ | 275,839  |      |  | $ | 179,691  |  
|                                                                                         |  |                                  |         |   |      |   |          |      |  |   |          |  

See accompanying notes to consolidated financial statements.



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ViroPharma Incorporated

Notes to the Consolidated Financial Statements

Note 1. Organization and Business Activities

ViroPharma Incorporated
and subsidiaries is a global biotechnology company dedicated to the development and commercialization of products that address serious diseases, with a focus on products used by physician specialists or in hospital settings. We have two marketed
products and two development programs. We intend to grow through sales of our marketed products, CinryzeTMand Vancocin®, through continued development of our product pipeline, expansion of sales of Cinryze into additional territories and through potential acquisition or licensing of
products or acquisition of companies.

We market and sell Cinryze in the United States for routine prophylaxis against angioedema attacks in
adolescent and adult patients with hereditary angioedema (HAE). Cinryze is a C1 esterase inhibitor therapy for routine prophylaxis against HAE, also known as C1 inhibitor (C1-INH) deficiency, a rare, severely debilitating, life-threatening genetic
disorder. Cinryze was obtained in October 2008, when we completed our acquisition of Lev Pharmaceuticals, Inc. (Lev). On January 8, 2010 we acquired expanded rights to commercialize Cinryze and future C1-INH derived products in certain
European countries and other territories throughout the world (as described in the strategic relationships section) as well as rights to develop future C1-INH derived products for additional indications. We intend to seek to commercialize Cinryze in
Europe in 2011 in countries which we have distribution rights. We are currently evaluating our commercialization plans in additional territories. We also intend to conduct studies to identify further therapeutic uses and expand the labeled
indication for Cinryze to potentially include other C1 mediated diseases as well as new modes of administration.

We also market and sell
Vancocin HCl capsules, the oral capsule formulation of vancomycin hydrochloride, in the U.S. and its territories. Vancocin is a potent antibiotic approved by the U.S. Food and Drug Administration, or FDA, to treat antibiotic-associated
pseudomembranous colitis caused by Clostridium difficileinfection (CDI), or C. difficile, and enterocolitis caused by Staphylococcus aureus, including methicillin-resistant strains.

We currently have two development programs, C1 esterase inhibitor [human] to identify further therapeutic uses and potential additional indications and
other modes of administration for the treatment of HAE and other C1 mediated diseases and a non-toxigenic strain of C. difficile (NTCD) for the treatment and prevention of CDI. On August 6, 2009 we announced that dosing has begun in the Phase 1
clinical trial for NTCD. The Phase 1 study will determine the safety and tolerability of NTCD dosed orally as a single and repeat escalating doses in healthy young and older adults. On February 9, 2009, we announced that our Phase 3 trial
evaluating maribavir used as prophylaxis in allogeneic stem cell, or bone marrow, transplant (SCT) patients did not achieve its primary endpoint. In the primary analysis, there was no statistically significant difference between maribavir and
placebo in reducing the rate of CMV disease. Additionally, on February 13, 2009, we announced that enrollment in our Phase 3 trial evaluating maribavir in liver transplant patients was discontinued and that all patients on study drug were moved
to the current standard of care. We continue to evaluate our maribavir program in light of the Phase 3 clinical trial results.

Note
2. Basis of Presentation

Principles of Consolidation

The consolidated financial statements include the accounts of ViroPharma and its wholly-owned subsidiaries. All intercompany accounts and transactions have
been eliminated in consolidation.

Cash and cash equivalents

The Company considers all highly liquid investments with an original maturity of three months or less when purchased to be cash equivalents.



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ViroPharma Incorporated

Notes to the Consolidated Financial Statements(Continued)



Concentration of credit risk

The Company invests its excess cash and short-term investments in accordance with a policy objective that seeks to ensure both liquidity and safety of principal. The policy limits investments to certain types of instruments issued by the
U.S. government and institutions with strong investment grade credit ratings and places restrictions in their terms and concentrations by type and issuer to reduce the Companys credit risk.

The Company has an exposure to credit risk in its trade accounts receivable from sales of Vancocin and Cinryze. Vancocin is distributed through wholesalers
that sell the product to pharmacies and hospitals and Cinryze is distributed through specialty pharmacy/ specialty distributors (SP/SDs) who then sell and distribute to physicians, hospitals and patients, among others. These three wholesalers
and two SP/SDs represent approximately 88% of our trade accounts receivable at December 31, 2009 and approximately 83% of our 2009 net product sales.

The Company, in connection with the issuance of the senior convertible senior notes, have entered into privately-negotiated transactions with two counterparties (the counterparties), comprised
of purchased call options and warrants sold. These transactions will reduce the potential equity dilution of our common stock upon conversion of the senior convertible notes. These transactions expose the Company to counterparty credit risk for
nonperformance. The Company manages its exposure to counterparty credit risk through specific minimum credit standards, and diversification of counterparties.

Single source supplier

The company currently outsources all of our toll
manufacturing agreements to single source manufactures for Vancocin and Cinryze. A change in suppliers for Vancocin or Cinryze could cause a delay in manufacturing and a possible loss of sales, which would affect operating results adversely.

Accounts receivable

Accounts receivable are recorded at the invoiced amount, net of related cash discounts and do not bear interest. The allowance for doubtful accounts is based on a specific review of the Companys
accounts receivable. At December 31, 2009 and 2008, there was no allowance for doubtful accounts. The Company does not have any off-balance sheet exposure related to its customers.

Inventories

Inventories are stated at the lower of cost or market using actual cost. At December 31, 2009 and 2008, inventory consists of finished goods. work-in-process (WIP) and certain starting materials required to produce inventory of
Vancocin and Cinryze.

Property, equipment and building improvements

Property, equipment and building improvements are recorded at cost. Depreciation and amortization are computed on a straight-line basis over the useful lives
of the assets or the lease term, whichever is shorter, ranging from three to thirty years.

The Company leases certain of its equipment and
facilities under operating leases. Operating lease payments are charged to operations on a straight-lined basis over the related period that such leased assets are utilized in service. Expenditures for repairs and maintenance are expensed as
incurred.



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ViroPharma Incorporated

Notes to the Consolidated Financial Statements(Continued)



Goodwill and Intangible Assets

Goodwill is not amortized, but is evaluated annually for impairment or when indicators of a potential impairment are present. Our impairment testing of goodwill is performed separately from our impairment
testing of individual intangibles. The annual evaluation for impairment of goodwill is based on valuation models that incorporate assumptions and internal projections of expected future cash flows and operating plans. We believe such assumptions are
also comparable to those that would be used by other marketplace participants.

During the first quarter of 2009 and as of March 31,
2009, the market capitalization of ViroPharma fell below the carrying value of the our net assets due to the results of our Phase 3 clinical trial evaluating maribavir used as prophylaxis in allogeneic stem cell transplant patients and our decision
to discontinue dosing in our Phase 3 trial of maribavir in solid organ (liver) transplant patients. The fact that our market capitalization fell below our carrying value required us to test for impairment of our goodwill and other intangible assets.
See Note 7 for further discussion of this impairment test.

Intangible assets acquired as part of the Vancocin and Lev acquisitions are being
amortized on a straight-line basis over their estimated useful lives of 25 years. The Company estimated the useful life of the assets by considering competition by products prescribed for the same indication, the likelihood and estimated future
entry of non-generic and generic competition with the same or similar indication and other related factors. The factors that drive the estimate of the life are often uncertain and are reviewed on a periodic basis or when events occur that warrant
review.

Impairment or Disposal of Long-Lived Assets

The Company assesses the recoverability of long-lived assets for which an indicator of impairment exists, as necessary. Specifically, the Company determines
if a long-lived asset or asset group is impaired by comparing the carrying value of these assets to their estimated undiscounted future operating cash flows. If impairment is indicated, a charge is recognized for the difference between the
assets carrying value and fair value. See Note 5 for discussion of impairments of our previous Company headquarters in 2009 and 2008.

Revenue recognition

Revenue is recognized when all four of the following criteria
are met (1) the Company has persuasive evidence an arrangement exists, (2) the price is fixed and determinable, (3) title has passed, and (4) collection is reasonably assured. The Companys credit and exchange policy
includes provisions for return of its product when it (1) has expired, or (2) was damaged in shipment.

Product
revenue for Vancocin and Cinryze is recorded upon delivery to either the wholesaler or specialty pharmacy/specialty distributor (SP/SD), when title has passed. Product demand from wholesalers during a given period may not correlate with prescription
demand for the product in that period. As a result, the Company periodically estimates and evaluates the wholesalers inventory position and would defer recognition of revenue on product that has been delivered if the Company believes that
channel inventory at a period end is in excess of ordinary business needs and if the Company believes the value of potential returns is materially different than the returns accrual. During 2009, 2008 and 2007, the Company did not defer any Vancocin
product sales. Product revenue for Cinryze was deferred until the product was shipped to the end customer by the specialty pharmacy until the 2ndquarter of 2009. Beginning in the 2ndquarter of 2009, Cinryze revenue is recorded upon delivery to the wholesaler.



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ViroPharma Incorporated

Notes to the Consolidated Financial Statements(Continued)



Contract revenues are earned and recognized according to the provisions of each agreement. Contract milestone payments related to the achievement of
substantive steps or regulatory events in the development process are recognized as revenues upon the completion of the milestone event or requirement. Payments, if any, received in advance of performance under a contract are deferred and recognized
as revenue when earned. Up-front licensing fees where the Company has continuing involvement are deferred and amortized over the estimated performance period. Revenue from government grants is recognized as the related performance to which they are
related occurs.

Sales Allowances

The Company records appropriate sales allowances upon the recognition of product revenue. The Companys return policy for Vancocin is limited to damaged or expired product. Cinryze has a no return
policy. The return allowance is determined based on analysis of the historical rate of returns associated with Vancocin, which is then applied to sales, and is analyzed considering estimated wholesaler inventory and prescriptions. The chargeback and
rebate allowances are determined based on analysis of the historical experience of government agencies market share and governmental contractual prices relative to current selling prices, as well as the payor mix information provided by our
wholesalers and from information obtained through Cinryze Solutions.

Customers

The Companys net product sales are related to Vancocin and Cinryze. For Vancocin, our customers are wholesalers who then distribute the product to
pharmacies, hospitals and long term care facilities, among others. For Cinryze, our customers are specialty pharmacy and specialty distributors (SP/SD) who will distribute the product to physicians, hospitals and patients.

Four wholesalers and/or SP/SDs represent the majority of the Companys consolidated total revenue, as approximated below:



|           |  |                              |   |  |      |   |  |      |  
|---------- |  | ---------------------------- | - |  | ---- | - |  | ---- | -
|           |  | Percentage of total revenues |  
|           |  | 2009                         |   |  | 2008 |   |  | 2007 |  
|Customer A |  | 29                           | % |  | 39   | % |  | 37   | %
|Customer B |  | 25                           | % |  | 38   | % |  | 40   | %
|Customer C |  | 13                           | % |  | 17   | % |  | 16   | %
|Customer D |  | 12                           | % |  |     |   |  |     |  
|           |  |                              |   |  |      |   |  |      |  
|Total      |  | 79                           | % |  | 94   | % |  | 93   | %
|           |  |                              |   |  |      |   |  |      |  

Research and development expenses

Research and product development costs are expensed as incurred. Reimbursements of research and development costs under cost sharing collaborations are
recorded as a reduction of research and development expenses. Research and development costs include costs for discovery research, pre-clinical and clinical trials, manufacture of drug supply, supplies and acquired services, employee-related costs
and allocated and direct facility expenses.

Income taxes

Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences
attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit



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ViroPharma Incorporated

Notes to the Consolidated Financial Statements(Continued)



carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary difference are expected to be
recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in operations in the period that includes the enactment date. A valuation allowance is provided when it is more likely than not that some
portion or all of a deferred tax asset will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income and the reversal of deferred tax liabilities during the period in which related
temporary difference becomes deductible. The benefit of tax positions taken or expected to be taken in the Companys income tax returns are recognized in the consolidated financial statements if such positions are more likely than not of being
sustained.

Use of estimates

The preparation of the Companys consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates
and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates.

Share-based payments

The Company adopted the new accounting for share-based
payments using the modified prospective approach effective January 1, 2006. This pronouncement requires the Company to measure the cost of employee services received in exchange for an award of equity instruments based on the grant-date fair
value of the award. That cost shall be recognized over the period during which an employee is required to provide service in exchange for the awardthe requisite service period (vesting period). The grant-date fair value of employee share
options are estimated using the Black-Scholes option-pricing model adjusted for the unique characteristics of those instruments. See Note 12 for the disclosures related to share-based compensation.

Compensation expense for options granted to non-employees is determined in accordance with the standard as the fair value of the consideration received or
the fair value of the equity instruments issued, whichever is more reliably measured. Compensation expense for options granted to non-employees is remeasured each period as the underlying options vest.

Earnings per share

Basic earnings per share (EPS) is calculated by dividing net income by the weighted average shares of common stock outstanding during the period. Diluted EPS reflects the potential dilution of securities that could share in the earnings,
including the effect of dilution to net income of convertible securities, stock options and warrants see Note 14.

Segment information

The Company is managed and operated as one business. The entire business is managed by a single
management team that reports to the chief executive officer. The Company does not operate separate lines of business or separate business entities with respect to any of its products or product candidates and all of its product sales are within the
U.S. Accordingly, the Company does not prepare discrete financial information with respect to separate product areas or by location and does not have separately reportable segments.



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ViroPharma Incorporated

Notes to the Consolidated Financial Statements(Continued)



Foreign Currency Translation

The financial statements of the Companys international subsidiaries are translated into U.S. dollars using the exchange rate at each balance sheet date for assets and liabilities, the historical exchange rate for stockholders
equity and an average exchange rate for each period of revenues, expenses, and gain and losses. The functional currency of the Companys non-U.S. subsidiaries is the local currency. Adjustments resulting from the translation of financial
statements are reflected in accumulated other comprehensive income. Transaction gains and losses are charged to operations.

Subsequent Events

We have evaluated all subsequent events through the date the financial statements were issued.

Reclassification

Certain prior year amounts related to our medical education and medical affairs costs have been reclassified within operating expenses to conform to the current year presentation.

New Accounting Standards

In June 2009, the Financial Accounting Standards Board (FASB) issued ASC Topic 105, Generally Accepted Accounting Principles, which became the single source of authoritative nongovernmental U.S. generally accepted accounting principles
(GAAP), superseding existing FASB, American Institute of Certified Public Accountants (AICPA), Emerging Issues Task Force (EITF), and related accounting literature. This pronouncement reorganizes the thousands of GAAP pronouncements into roughly 90
accounting topics and displays them using a consistent structure. Also included is relevant Securities and Exchange Commission guidance organized using the same topical structure in separate sections and is effective for financial statements issued
for reporting periods that end after September 15, 2009. We adopted this pronouncement in 2009 and modified our financial disclosures to authoritative accounting literature that will be references in accordance with ASC Topic 105.

In August 2009, the FASB issued a new accounting pronouncement that provides clarification that in circumstances in which a quoted price in an active
market for the identical liability is not available, a reporting entity is required to measure fair value using one or more of the following methods: 1) a valuation technique that uses a) the quoted market price of the identical liability when
trades as an asset or b) quoted prices for similar liabilities or similar liabilities when trades as assets and/or 2) a valuation technique that is consistent with the principles of ASC Topic 820. The new accounting pronouncement also clarifies that
when estimating the fair value of a liability, a reporting entity is not required to adjust inputs relating to the existence of transfer restrictions on that liability. The adoption of this standard did not have an impact on our financial position
or results of operations; however, this standard may impact us in future periods.

In May 2009, the FASB released a new accounting
pronouncement which establishes the accounting for and disclosure of events that occur after the balance sheet date but before financial statements are issued or are available to be issued. The adoption this pronouncement did not have a material
impact on our financial statements.

In April 2009, the FASB released a new pronouncement which requires certain disclosures about fair value
of financial instruments in interim financial statements and in annual financial statements. We adopted this pronouncement on June 30, 2009 and have provided the necessary additional disclosures.



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ViroPharma Incorporated

Notes to the Consolidated Financial Statements(Continued)



In April 2009, the FASB issued guidance in determining whether impairments in debt securities are other than temporary, and modifies the presentation and
disclosures surrounding such instruments. This guidance is effective for interim periods ending after June 15, 2009. We adopted the provisions of this guidance during second quarter 2009, with no impact on our financial position, cash
flows, or disclosures.

In May 2008, the FASB issued a new pronouncement that requires the issuer of convertible debt instruments with cash
settlement features to separately account for the liability and equity components of the instrument. The debt is recognized at the present value of its cash flows discounted using the issuers nonconvertible debt borrowing rate. The equity
component is recognized as the difference between the proceeds from the issuance of the note and the fair value of the liability. This pronouncement which is part of ASC Topic 470 also requires an accretion of the resultant debt discount over the
expected life of the debt. The transition guidance requires retrospective application to all periods presented, and does not grandfather existing instruments. We adopted this pronouncement on January 1, 2009 and retrospectively applied this
change in accounting to all prior periods presented for which we had applicable outstanding convertible debt. The adoption is discussed further in Note 3.

Effective January 1, 2009, we adopted a newly issued accounting standard for fair value measurements of all nonfinancial assets and nonfinancial liabilities not recognized or disclosed at fair value
in the financial statements on a recurring basis. The adoption of the accounting standard for these assets and liabilities did not have an impact on our financial statements other than additional disclosures, which are included in the footnotes.

Effective January 1, 2009, we adopted a newly issued accounting standard for business combinations. This standard requires an acquiring
company to measure all assets acquired and liabilities assumed, including contingent considerations and all contractual contingencies, at fair value as of the acquisition date. In addition, an acquiring company is required to capitalize IPR&D
and either amortize it over the life of the product, or write it off if the project is abandoned or impaired. The standard also amended accounting for uncertainty in income taxes in a business combination. Previously, accounting standards generally
required post-acquisition adjustments related to business combination deferred tax asset valuation allowances and liabilities for uncertain tax positions to be recorded as an increase or decrease to goodwill. This new standard does not permit this
accounting and, generally, requires any such changes to be recorded in current period income tax expense. Thus, all changes to valuation allowances and liabilities for uncertain tax positions established in acquisition accounting are accounted for
under this guidance and will be recognized in current period income tax expense.

In April, 2009, the FASB issued a new accounting standard
providing guidance for the accounting of assets acquired and liabilities assumed in a business combination that arise from contingencies, This guidance amends and clarifies previous accounting standards to address application issues regarding the
initial recognition and measurement, subsequent measurement and accounting, and disclosure of assets and liabilities arising from contingencies in a business combination. Due to the fact that this guidance is applicable to acquisitions completed
after January 1, 2009 and we did not have any business combinations in the year ended December 31, 2009, the adoption did not impact our financial position or results of operations.

In March 2008, the FASB issued guidance which changes the disclosure requirements for derivative instruments and hedging activities. Entities are
required to provide enhanced disclosures about (a) how and why an entity uses derivative instruments, (b) how derivative instruments and related hedged items are accounted for under the Derivatives and Hedging Topic of the ASC (ASC Topic
815), and (c) how derivative instruments and related hedged items affect an entitys financial position, financial performance, and cash flows. We adopted this guidance on January 1, 2009 and such disclosures are included herein.

In June 2008, the FASB issued guidance which stated that unvested share-based payment awards that contain rights to receive
nonforfeitable dividends (whether paid or unpaid) are participating securities, and should be



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ViroPharma Incorporated

Notes to the Consolidated Financial Statements(Continued)



included in the two-class method of computing EPS. We adopted this pronouncement on January 1, 2009. We do not have share-based payment awards that contain rights to nonforfeitable
dividends, thus this pronouncement does not impact our consolidated financial statements.

In June 2008, the FASB ratified guidance which
provides that an entity should use a two step approach to evaluate whether an equity-linked financial instrument (or embedded feature) is indexed to its own stock, including evaluating the instruments contingent exercise and settlement
provisions. We adopted this guidance on January 1, 2009 with no impact on operating results or financial position.

Note
3. Accounting Change Adopted

We adopted the new accounting provisions for our convertible debt securities as of January 1, 2009
and retrospectively applied this change in accounting to all prior periods presented for which we had applicable outstanding convertible debt, as required by this new standard. In accordance with GAAP all prior periods presented herein have been
adjusted to apply the new method retrospectively. Under this new method of accounting, the debt and equity components of our convertible debt securities are bifurcated and accounted for separately based on the value and related interest rate of
a non-convertible debt security with the same terms. The fair value of a non-convertible debt instrument at the original issuance date was determined to be $148.1 million. The equity (conversion options) component of our convertible debt securities
is included in Additional paid-in capital on our Consolidated Balance Sheet and, accordingly, the initial carrying value of the debt securities was reduced by $101.9 million. Our net income for financial reporting purposes was reduced by
recognizing the accretion of the reduced carrying values of our convertible debt securities to their face amount of $250.0 million as additional non-cash interest expense. The adoption of this new standard has resulted in a reduction in the carrying
value of our convertible debt by approximately $89.0 million as of December 31, 2008. In addition, the adoption of this standard reduced our deferred debt issuance costs as we were required to allocate the amount related to the conversion
option to equity.

Due to the retrospective adoption of the standard, we had to adjust our previously recognized deferred tax asset related to
our convertible debt. The bifurcation of the convertible notes caused us to establish a deferred tax liability at issuance. This change in prior period deferred tax assets impacted the deferred tax assets ultimately available to be
recognized in the purchase accounting for our acquisition of Lev in October 2008. Accordingly the goodwill resulting from the transaction increased $35.2 million to $65.1 million in our adjusted December 31, 2008 balance sheet.



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ViroPharma Incorporated

Notes to the Consolidated Financial Statements(Continued)



Condensed Consolidated Balance Sheet



|                                                |  |                         |           |                          |   |          
|----------------------------------------------- |  | ----------------------- | --------- | ------------------------ | - | ---------
|(in thousands, except share and per share data) |  | RevisedDecember 31,2008 |           | ReportedDecember 31,2008
|Assets                                          |  |                         |           |                          |   |          
|Current assets:                                 |  |                         |           |                          |   |          
|Total current assets                            |  | $                       | 360,880   |                          | $ | 360,880  
|Goodwill                                        |  |                         | 65,099    |                          |   | 29,936   
|Debt issue costs, net                           |  |                         | 3,892     |                          |   | 6,610    
|                                                |  |                         |           |                          |   |          
|Total assets                                    |  | $                       | 1,086,129 |                          | $ | 1,053,684
|                                                |  |                         |           |                          |   |          
|Liabilities and Stockholders Equity            |  |                         |           |                          |   |          
|Current liabilities:                            |  |                         |           |                          |   |          
|Accrued expenses and other current liabilities  |  | $                       | 35,650    |                          | $ | 35,650   
|                                                |  |                         |           |                          |   |          
|Total current liabilities                       |  |                         | 43,467    |                          |   | 43,467   
|Deferred tax liability                          |  |                         | 128,254   |                          |   | 95,121   
|Long-term debt                                  |  |                         | 161,003   |                          |   | 250,000  
|                                                |  |                         |           |                          |   |          
|Total liabilities                               |  |                         | 336,795   |                          |   | 392,660  
|                                                |  |                         |           |                          |   |          
|Commitments and Contingencies                   |  |                         |           |                          |   |          
|Additional paid-in capital                      |  |                         | 690,502   |                          |   | 595,287  
|Retained earnings                               |  |                         | 59,331    |                          |   | 66,236   
|                                                |  |                         |           |                          |   |          
|Total stockholders equity                      |  |                         | 749,334   |                          |   | 661,024  
|                                                |  |                         |           |                          |   |          
|Total liabilities and stockholders equity      |  | $                       | 1,086,129 |                          | $ | 1,053,684
|                                                |  |                         |           |                          |   |          

Consolidated Statements of Operations



|                                               |  |                                 |         |   |              |   |        |  
|---------------------------------------------- |  | ------------------------------- | ------- | - | ------------ | - | ------ | -
|                                               |  | For the years endedDecember 31, |        
|(in thousands, except per share data)          |  | Revised2008                     |         |   | Reported2008 |  
|Operating income                               |  | $                               | 78,655  |   |              | $ | 78,655 |  
|Other Income (Expense):                        |  |                                 |         |   |              |   |        |  
|Interest income                                |  |                                 | 14,296  |   |              |   | 14,296 |  
|Interest expense                               |  |                                 | (12,951 | ) |              |   | (5,852 | )
|                                               |  |                                 |         |   |              |   |        |  
|Income before income tax expense               |  |                                 | 80,000  |   |              |   | 87,099 |  
|Income tax expense                             |  |                                 | 16,040  |   |              |   | 19,482 |  
|                                               |  |                                 |         |   |              |   |        |  
|Net income                                     |  | $                               | 63,960  |   |              | $ | 67,617 |  
|                                               |  |                                 |         |   |              |   |        |  
|Net income per share:                          |  |                                 |         |   |              |   |        |  
|Basic                                          |  | $                               | 0.90    |   |              | $ | 0.95   |  
|Diluted                                        |  | $                               | 0.84    |   |              | $ | 0.83   |  
|Shares used in computing net income per share: |  |                                 |         |   |              |   |        |  
|Basic                                          |  |                                 | 71,391  |   |              |   | 71,391 |  
|Diluted                                        |  |                                 | 85,712  |   |              |   | 85,712 |  



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ViroPharma Incorporated

Notes to the Consolidated Financial Statements(Continued)



|                                               |  |             |         |   |              |   |         |  
|---------------------------------------------- |  | ----------- | ------- | - | ------------ | - | ------- | -
|(in thousands, except per share data)          |  | Revised2007 |         |   | Reported2007 |  
|Operating income                               |  | $           | 115,796 |   |              | $ | 115,796 |  
|Other Income (Expense):                        |  |             |         |   |              |   |         |  
|Interest income                                |  |             | 24,265  |   |              |   | 24,265  |  
|Interest expense                               |  |             | (9,612  | ) |              |   | (4,395  | )
|                                               |  |             |         |   |              |   |         |  
|Income before income tax expense               |  |             | 130,449 |   |              |   | 135,666 |  
|Income tax expense                             |  |             | 38,344  |   |              |   | 40,313  |  
|                                               |  |             |         |   |              |   |         |  
|Net income                                     |  | $           | 92,105  |   |              | $ | 95,353  |  
|                                               |  |             |         |   |              |   |         |  
|Net income per share:                          |  |             |         |   |              |   |         |  
|Basic                                          |  | $           | 1.32    |   |              | $ | 1.37    |  
|Diluted                                        |  | $           | 1.21    |   |              | $ | 1.21    |  
|Shares used in computing net income per share: |  |             |         |   |              |   |         |  
|Basic                                          |  |             | 69,827  |   |              |   | 69,827  |  
|Diluted                                        |  |             | 80,891  |   |              |   | 80,891  |  

Note 4. Inventory

Inventory is related to Cinryze and Vancocin and is stated at the lower of cost or market using actual cost. The following represents the components of the
inventory at December 31, 2009 and December 31, 2008:



|                |  |                  |        |                  |   |       
|--------------- |  | ---------------- | ------ | ---------------- | - | ------
|(in thousands)  |  | December 31,2009 |        | December 31,2008
|Raw Materials   |  | $                | 26,780 |                  | $ | 11,861
|Work In Process |  |                  | 8,533  |                  |   | 10,802
|Finished Goods  |  |                  | 6,269  |                  |   | 4,505 
|                |  |                  |        |                  |   |       
|Total           |  | $                | 41,582 |                  | $ | 27,168
|                |  |                  |        |                  |   |       

Note 5. Property, Equipment and Building Improvements

Property, equipment and building improvements consists of the following at December 31, 2009 and 2008:



|                                                   |  |      |        |      |   |      
|-------------------------------------------------- |  | ---- | ------ | ---- | - | -----
|(in thousands)                                     |  | 2009 |        | 2008
|Land                                               |  | $    | 156    |      | $ |     
|Building                                           |  |      | 3,039  |      |   |     
|Computers and equipment                            |  |      | 7,176  |      |   | 6,219
|Leasehold improvements                             |  |      | 5,191  |      |   | 3,388
|                                                   |  |      |        |      |   |      
|                                                   |  |      | 15,562 |      |   | 9,607
|Less: accumulated depreciation and amortization    |  |      | 5,054  |      |   | 2,754
|                                                   |  |      |        |      |   |      
|Property, equipment and building improvements, net |  | $    | 10,508 |      | $ | 6,853
|                                                   |  |      |        |      |   |      

During 2009, we reclassified property and a building that was
previously held for sale to a held and use long term asset. This was due to the Companys decision to lease our previous corporate headquarters and take the building off the market. In accordance with the applicable accounting pronouncements,
we adjusted the carrying value of the building to fair value at the time of the reclassification and incurred a $3.4 million impairment to the building. During 2008, we incurred a $2.3 million impairment related to this building.



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ViroPharma Incorporated

Notes to the Consolidated Financial Statements(Continued)



The useful life for the major categories of property and equipment are 30 years for the building, 3 to 5 years for computers and equipment and 15 years for
building improvements.

Note 6. Intangible Assets

The following represents the balance of the intangible assets at December 31, 2009:



|                       |  |                       |         |                         |   |                     |  |   |        
|---------------------- |  | --------------------- | ------- | ----------------------- | - | ------------------- |  | - | -------
|(in thousands)         |  | GrossIntangibleAssets |         | AccumulatedAmortization |   | NetIntangibleAssets
|Cinryze Product rights |  | $                     | 521,000 |                         | $ | 24,873              |  | $ | 496,127
|Vancocin Intangibles   |  |                       | 154,099 |                         |   | 31,716              |  |   | 122,383
|                       |  |                       |         |                         |   |                     |  |   |        
|Total                  |  | $                     | 675,099 |                         | $ | 56,589              |  | $ | 618,510
|                       |  |                       |         |                         |   |                     |  |   |        

The following represents the balance of the intangible assets at
December 31, 2008:



|                       |  |                       |         |                         |   |                     |  |   |        
|---------------------- |  | --------------------- | ------- | ----------------------- | - | ------------------- |  | - | -------
|(in thousands)         |  | GrossIntangibleAssets |         | AccumulatedAmortization |   | NetIntangibleAssets
|Cinryze Product rights |  | $                     | 521,000 |                         | $ | 4,034               |  | $ | 516,966
|Vancocin Intangibles   |  |                       | 147,099 |                         |   | 24,372              |  |   | 122,727
|                       |  |                       |         |                         |   |                     |  |   |        
|Total                  |  | $                     | 668,099 |                         | $ | 28,406              |  | $ | 639,693
|                       |  |                       |         |                         |   |                     |  |   |        

In December 2008, FDA changed OGDs 2006 bioequivalence
recommendation, which we have opposed since its original proposal in March 2006, by issuing draft guidance for establishing bioequivalence to Vancocin which would require generic products that have the same inactive ingredients in the same
quantities as Vancocin (Q1 and Q2 the same) to demonstrate bioequivalence through comparative in vitro dissolution testing. Under this latest proposed method, any generic product that is not Q1 and Q2 the same as Vancocin would need
to conduct an in vivo study with clinical endpoints to demonstrate bioequivalence with Vancocin.

On August 4, 2009 the FDAs
Pharmaceutical Science and Clinical Pharmacology Advisory Committee voted in favor of the OGDs 2008 draft guidelines on bioequivalence for Vancocin. If FDAs proposed bioequivalence method for Vancocin becomes effective, the time period
in which a generic competitor could be approved would be reduced and multiple generics may enter the market, which would materially impact our operating results, cash flows and possibly intangible asset valuations. This could also result in a
reduction to the useful life of the Vancocin-related intangible assets. Management currently believes there are no indicators that would require a change in useful life as management believes that Vancocin will continue to be utilized along with
generics that may enter the market, and the number of generics and the timing of their market entry is unknown.

A reduction in the useful
life, as well as the timing and number of generics, will impact our cash flow assumptions and estimate of fair value, perhaps to a level that could result in an impairment charge. We will continue to monitor the actions of the OGD and consider the
effects of our opposition actions and the announcements by generic competitors or other adverse events for additional impairment indicators. We will reevaluate the expected cash flows and fair value of our Vancocin-related assets at such time a
triggering event occurs.

We are obligated to pay Eli Lilly and Company (Lilly) additional purchase price consideration based on net sales of
Vancocin within a calendar year. The additional purchase price consideration is determined by the annual net sales of Vancocin, is paid quarterly and is due each year through 2011. We account for these additional payments



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Notes to the Consolidated Financial Statements(Continued)



as additional purchase price which requires that the additional purchase price consideration is recorded as an increase to the intangible asset of Vancocin and is amortized over the remaining
estimated useful life of the intangible asset. In addition, at the time of recording the additional intangible assets, a cumulative adjustment is recorded to accumulated intangible amortization, in addition to ordinary amortization expense, in order
to reflect amortization as if the additional purchase price had been paid in November 2004.

As of December 31, 2009, we have paid an
aggregate of $37.1 million to Lilly in additional purchase price consideration, as our net sales of Vancocin surpassed the maximum obligation level of $65 million in 2009, 2008, 2007, 2006 and 2005. The $37.1 million paid to Lilly was based upon 35%
of $20 million in 2009 and 2008, 35% of $17 million in 2007, 35% of $19 million in 2006 and 50% of $21 million in 2005. We are obligated to pay Lilly additional amounts based on 35% of annual net sales between $45 and $65 million of Vancocin during
2010 and 2011.

No additional payments are due to Lilly on net sales of Vancocin below or above the net sales levels reflected above.

At the time of recording the additional intangible assets, the Company recorded a cumulative adjustment in 2009 and 2008 of approximately $1.3
million and $1.0 million, respectively, to accumulated intangible amortization, in addition to ordinary amortization expense, in order to reflect amortization as if the additional purchase price had been paid in November 2004.

Amortization expense for the years ended December 31, 2009, 2008 and 2007 was $28.2 million, $10.8 million and $6.1 million, respectively. The
estimated aggregated amortization expense for each of the next five years will be approximately $27.0 million, excluding any future increases related to additional purchase price consideration that may be payable to Lilly.

Note 7. Goodwill Impairment

During the
first quarter of 2009 and as of March 31, 2009, the market capitalization of ViroPharma fell below the carrying value of the our net assets due to the results of our Phase 3 clinical trial evaluating maribavir used as prophylaxis in allogeneic
stem cell transplant patients and our decision to discontinue dosing in our Phase 3 trial of maribavir in solid organ (liver) transplant patients. The fact that our market capitalization fell below our carrying value required us to test for
impairment of our goodwill and other intangible assets. We conducted this analysis at March 31, 2009 and concluded that our goodwill was impaired due to our market capitalization being below the carrying value of our net assets for an extended
period of time. We incurred a $65.1 million charge in the first quarter related to this goodwill impairment.

Note 8. Accrued expenses and
other current liabilities

Accrued expenses and other current liabilities consist of the following at December 31, 2009 and 2008:



|                                                 |  |      |        |      |   |       
|------------------------------------------------ |  | ---- | ------ | ---- | - | ------
|(in thousands)                                   |  | 2009 |        | 2008
|Rebates and returns                              |  | $    | 15,460 |      | $ | 7,243 
|Payroll, bonus and employee benefits liabilities |  |      | 6,411  |      |   | 4,647 
|Clinical development and research liabilities    |  |      | 3,365  |      |   | 6,795 
|Selling and commercial liabilities               |  |      | 2,308  |      |   | 3,046 
|Interest payable                                 |  |      | 1,196  |      |   | 1,403 
|Other current liabilities                        |  |      | 4,614  |      |   | 12,516
|                                                 |  |      |        |      |   |       
|                                                 |  | $    | 33,354 |      | $ | 35,650
|                                                 |  |      |        |      |   |       



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ViroPharma Incorporated

Notes to the Consolidated Financial Statements(Continued)



Note 9. Long-Term Debt

Long-term debt
as of December 31, 2009 and December 31, 2008 (as adjusted by Note 3) is summarized in the following table:



|                         |  |                  |         |                          |   |        
|------------------------ |  | ---------------- | ------- | ------------------------ | - | -------
|(in thousands)           |  | December 31,2009 |         | AdjustedDecember 31,2008
|Senior convertible notes |  | $                | 138,614 |                          | $ | 161,003
|less: current portion    |  |                  |        |                          |   |       
|                         |  |                  |         |                          |   |        
|Total debt principal     |  | $                | 138,614 |                          | $ | 161,003
|                         |  |                  |         |                          |   |        

On March 26, 2007, we issued $250.0 million of 2% senior
convertible notes due March 2017 (the senior convertible notes) in a public offering. Net proceeds from the issuance of the senior convertible notes were $241.8 million. The senior convertible notes are unsecured unsubordinated
obligations and rank equally with any other unsecured and unsubordinated indebtedness. The senior convertible notes bear interest at a rate of 2% per annum, payable semi-annually in arrears on March 15 and September 15 of each
year commencing on September 15, 2007.

We adopted the new accounting provisions for our convertible debt securities as of January 1,
2009 and retrospectively applied this change in accounting to all prior periods presented for which we had applicable outstanding convertible debt, as required by this new standard. Under this new method of accounting, the debt and equity components
of our convertible debt securities are bifurcated and accounted for separately. Under this new method of accounting, the convertible debt securities will recognize interest expense at effective rates of 8.0% as they are accreted to par value.
See Note 3 for further explanation.

On March 24, 2009 we repurchased, in a privately negotiated transaction, $45.0 million in principal
amount of our senior convertible notes due March 2017 for total consideration of approximately $21.2 million. The repurchase represented 18% of our then outstanding debt and was executed at a price equal to 47% of par value. Following these
repurchases, senior convertible notes representing $205.0 million of principal debt are outstanding with a carrying value of $ 138.6 million as of December 31, 2009. Additionally, in negotiated transactions, we sold approximately
2.38 million call options for approximately $1.8 million and repurchased approximately 2.38 million warrants for approximately $1.5 million which terminated the call options and warrants that were previously entered into by us in March
2007. We recognized a $9.1 million gain in the first quarter of 2009 as a result of this debt extinguishment. For tax purposes, the gain qualifies for deferral until 2014 in accordance with the provisions of the American Recovery and
Reinvestment Act.

As of December 31, 2009, we have accrued $1.2 million in interest payable to holders of the senior convertible
notes. Debt issuance costs of $4.8 million have been capitalized and are being amortized over the term of the senior convertible notes, with the balance to be amortized as of December 31, 2009 being $2.8 million.

The senior convertible notes are convertible into shares of our common stock at an initial conversion price of $18.87 per share. The senior convertible
notes may only be converted: (i) anytime after December 15, 2016; (ii) during the five business-day period after any five consecutive trading day period (the measurement period) in which the price per note for each trading
day of that measurement period was less than 98% of the product of the last reported sale price of our common stock and the conversion rate on each such day; (iii) during any calendar quarter (and only during such quarter) after the calendar
quarter ending June 30, 2007, if the last reported sale price of our common stock for 20 or more trading days in a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter exceeds 130%
of the applicable conversion price in effect on the last trading day of the immediately preceding calendar quarter; or (iv) upon the



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ViroPharma Incorporated

Notes to the Consolidated Financial Statements(Continued)



occurrence of specified corporate events. Upon conversion, holders of the senior convertible notes will receive shares of common stock, subject to ViroPharmas option to irrevocably elect to
settle all future conversions in cash up to the principal amount of the senior convertible notes, and shares for any excess. We can irrevocably elect this option at any time on or prior to the 35th scheduled trading day prior to the maturity
date of the senior convertible notes. The senior convertible notes may be required to be repaid on the occurrence of certain fundamental changes, as defined in the senior convertible notes. As of December 31, 2009, the fair value of
the principal of the $205.0 million convertible senior notes outstanding was approximately $149.4 million, based on the level 2 valuation hierarchy of the fair value measurements standard.

Concurrent with the issuance of the senior convertible notes, we entered into privately-negotiated transactions, comprised of purchased call options and
warrants sold, to reduce the potential dilution of our common stock upon conversion of the senior convertible notes. The transactions, taken together, have the effect of increasing the initial conversion price to $24.92 per share. The net
cost of the transactions was $23.3 million.

The call options allowed ViroPharma to receive up to approximately 13.25 million shares of
its common stock at $18.87 per share from the call option holders, equal to the number of shares of common stock that ViroPharma would issue to the holders of the senior convertible notes upon conversion. These call options will terminate upon
the earlier of the maturity dates of the related senior convertible notes or the first day all of the related senior convertible notes are no longer outstanding due to conversion or otherwise. Concurrently, we sold warrants to the warrant
holders to receive shares of its common stock at an exercise price of $24.92 per share. These warrants expire ratably over a 60-day trading period beginning on June 13, 2017 and will be net-share settled.

The purchased call options are expected to reduce the potential dilution upon conversion of the senior convertible notes in the event that the market value
per share of ViroPharma common stock at the time of exercise is greater than $18.87, which corresponds to the initial conversion price of the senior convertible notes, but less than $24.92 (the warrant exercise price). The warrant exercise price is
75.0% higher than the price per share of $14.24 of the our on the pricing date. If the market price per share of ViroPharma common stock at the time of conversion of any senior convertible notes is above the strike price of the purchased call
options ($18.87), the purchased call options will entitle us to receive from the counterparties in the aggregate the same number of shares of our common stock as we would be required to issue to the holder of the converted senior convertible notes.
Additionally, if the market price of ViroPharma common stock at the time of exercise of the sold warrants exceeds the strike price of the sold warrants ($24.92), we will owe the counterparties an aggregate of approximately 13.25 million shares
of ViroPharma common stock. If we have insufficient shares of common stock available for settlement of the warrants, we may issue shares of a newly created series of preferred stock in lieu of our obligation to deliver common stock. Any such
preferred stock would be convertible into 10% more shares of our common stock than the amount of common stock we would otherwise have been obligated to deliver under the warrants. We are entitled to receive approximately 10.87 million shares of
its common stock at $18.87 from the call option holders and if the market price of ViroPharma common stock at the time of exercise of the sold warrants exceeds the strike price of the sold warrants ($24.92), will owe the counterparties an aggregate
of approximately 10.87 million shares of ViroPharma common stock.

The purchased call options and sold warrants are separate transactions
entered into by us with the counterparties, are not part of the terms of the senior convertible notes, and will not affect the holders rights under the senior convertible notes. Holders of the senior convertible notes will not have any rights
with respect to the purchased call options or the sold warrants. The purchased call options and sold warrants meet the definition of derivatives. These instruments have been determined to be indexed to our own stock and have been recorded in
stockholders equity in our Consolidated Balance Sheet. As long as the instruments are classified in stockholders equity they are not subject to the mark to market provisions.



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ViroPharma Incorporated

Notes to the Consolidated Financial Statements(Continued)



Note 10. Acquisition, License and Research Agreements

Lev Pharmaceuticals, Inc. Acquisition

In October 2008, we acquired all the
outstanding common stock of Lev Pharmaceuticals, Inc. (Lev). Lev was a biopharmaceutical company focused on developing and commercializing therapeutic products for the treatment of inflammatory diseases. The terms of the merger agreement provided
for the conversion of each share of Lev common stock into upfront consideration of $453.1 million, or $2.75 per Lev share, comprised of $2.25 per share in cash and $0.50 per share in ViroPharma common stock, and contingent consideration (CVRs)
of up to $1.00 per share which may be paid on achievement of certain regulatory and commercial milestones. As of December 31, 2009, only the second CVR as described below remains achievable. The target for the first CVR payment of $0.50 per
share (or $87.5 million) is no longer achievable and will not be paid as during the fourth quarter of 2009, a third partys human C1 inhibitor product was approved for the acute treatment of HAE and granted orphan exclusivity. The second CVR
payment of $0.50 per share ($87.5 million) becomes payable if Cinryze reaches at least $600 million in cumulative net product sales by October 2018.

The purchase price was as follows:



|                                                                                                          |  |                |        
|--------------------------------------------------------------------------------------------------------- |  | -------------- | -------
|                                                                                                          |  | (in thousands)
|Amount of cash paid to holders of Lev common stock, stock options and warrants                            |  | $              | 367,079
|Fair value of shares of ViroPharma common stock                                                           |  |                | 86,035 
|Original cost of ViroPharmas investment in Lev common stock                                              |  |                | 20,000 
|Transaction fees, including separation payments of $13.3 million made to Lev senior management at closing |  |                | 20,983 
|                                                                                                          |  |                |        
|Total purchase price                                                                                      |  | $              | 494,097
|                                                                                                          |  |                |        

The total cost of the acquisition was allocated to Levs assets
acquired and liabilities as follows:



|                          |  |                |        
|------------------------- |  | -------------- | -------
|                          |  | (in thousands)
|Cash                      |  | $              | 27,844 
|Accounts receivable       |  |                | 365    
|Inventory                 |  |                | 19,336 
|Property and equipment    |  |                | 177    
|Deferred income taxes     |  |                | 115,685
|Loan receivable           |  |                | 3,111  
|Other assets              |  |                | 1,147  
|Intangible product rights |  |                | 521,000
|Goodwill                  |  |                | 29,936 
|                          |  |                |        
|Total assets              |  | $              | 718,601
|                          |  |                |        
|Liabilities assumed:      |  |                |        
|Accounts payable          |  | $              | 2,129  
|Accrued expenses          |  |                | 17,142 
|Long-term debt            |  |                | 12,056 
|Deferred tax liabilities  |  |                | 193,177
|                          |  |                |        
|Total liabilities         |  | $              | 224,504
|                          |  |                |        
|Total purchase price      |  | $              | 494,097
|                          |  |                |        



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ViroPharma Incorporated

Notes to the Consolidated Financial Statements(Continued)



The retrospective adoption for the new accounting pronouncement related to our convertible debt eliminated the book and tax basis difference and related
deferred tax asset which resulted in an adjustment to the above goodwill and deferred income taxes of $35.2 million for the recasted December 31, 2008 balance sheet.

The value of the CVRs has not been included in the total cost of the acquisition, as the payment of these amounts is not reasonably assured at this time. Should any of the contingently issued
payments be made, that value would be added to the purchase price, in accordance with SFAS 141, Accounting for Business Combinations which was the effective GAAP at the time of the acquisition,

As a result of the acquisition, we obtained Cinryze, a C1 inhibitor, which has been approved by the FDA for routine prophylaxis of hereditary angioedema
(HAE) also known as C1 inhibitor deficiency, a rare, severely debilitating, life-threatening genetic disorder. We determined that Cinryze product rights have a fair value of $521.0 million. The estimated fair value of the identifiable product rights
for Cinryze was determined based upon a discounted cash flows model using a discount rate of 19%. Additionally, we have determined that the estimated useful life for the Cinryze product rights is 25 years. The amortization expense recognized in 2009
and 2008 was $20.8 million and $4.0 million, respectively.

The results of Levs operations have been included in the consolidated
financial statements beginning October 21, 2008. The following unaudited pro forma consolidated financial information reflects the Companys consolidated results of operations for the years ended December 31, 2008 and
December 31, 2007 as if the acquisition had occurred as of January 1, 2008 and January 1, 2007. These pro forma results have been prepared for information purposes only and are not indicative of the results of operations that would
have been achieved if the acquisition had taken place on January 1, 2008 and January 1, 2007 respectively or results that may occur in the future.



|                                      |  |                  |         |                  |   |        
|------------------------------------- |  | ---------------- | ------- | ---------------- | - | -------
|(in thousands, except per share data) |  | December 31,2008 |         | December 31,2007
|                                      |  | (Unaudited)     
|Revenue                               |  | $                | 232,307 |                  | $ | 203,770
|                                      |  |                  |         |                  |   |        
|Net income                            |  | $                | 18,905  |                  | $ | 40,166 
|                                      |  |                  |         |                  |   |        
|Diluted earnings per share            |  | $                | 0.25    |                  | $ | 0.49   
|                                      |  |                  |         |                  |   |        

Sanquin Rest of World (ROW) Agreement

On January 8, 2010 we obtained, as part of the Sanquin ROW Agreement, expanded rights to commercialize Cinryze and future C1-INH derived
products in certain European countries and other territories throughout the world as well as rights to develop future C1-INH derived products for additional indications. We intend to seek to commercialize Cinryze in Europe in countries which we have
distribution rights commencing in 2011 as well as in additional territories.

Vancocin Acquisition

In November 2004, the Company acquired all rights in the U.S. and its territories to manufacture, market and sell the oral capsule formulation of
Vancocin, as well as rights to certain related Vancocin products, from Lilly. Oral Vancocin is a potent antibiotic approved by the FDA to treat antibiotic-associated pseudomembranous colitis caused by Clostridium difficileinfection and
enterocolitis caused by S. aureus(including methicillin-resistant strains). Lilly retained its rights to vancomycin outside of the U.S. and its territories in connection with this transaction.



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ViroPharma Incorporated

Notes to the Consolidated Financial Statements(Continued)



Through this acquisition, the Company acquired certain know-how related to manufacturing of the product, the Vancocin trademark, starting material inventory,
the active New Drug Application (NDA) for Vancocin as well as additional rights relating to the injectable and oral solution formulations of vancomycin. In addition, the Company received certain related intellectual property and other information
and materials required to continue marketing the brand in the U.S. and its territories.

To acquire the rights to Vancocin, the Company paid
an upfront cash payment of $116.0 million. In addition, Lilly is entitled to additional payments on annual net sales of Vancocin within certain defined levels of sales occurring between 2005 and 2011 (see Note 6). In 2009, 2008 and 2007, the Company
paid $7.0 million, $7.0 million and $6.0 million, respectively, of these additional payments, which was accounted for as contingent consideration, increasing the carrying amount of the related intangible assets (see Note 6).

The Company recorded this transaction as an asset purchase with the purchase price and related transaction costs allocated to specific tangible and
intangible assets acquired. The intangible assets will be amortized over their related useful lives (see Note 6).

Merck
Agreement

In November 2003, the Company entered into an agreement granting Merck & Co., Inc. (Merck) the option
to license its intranasal formulation of pleconaril for the treatment of the common cold in the U.S. and Canada. Under terms of the agreement, Merck paid the Company an up-front option fee of $3.0 million, which was recognized as revenue over its
estimated performance period, which ended in August 2004.

In November 2004, the Company announced that Merck entered into a license agreement
under which Merck has assumed responsibility for all future development and commercialization of pleconaril. Other than transitioning the technology to Merck, the Company will have no further continuing operational involvement with the development
and commercialization of the intranasal formulation of pleconaril for the treatment of the common cold. Upon the effective date of the agreement, Merck paid the Company an initial license fee of $10.0 million, which was recorded as license fee and
milestone revenue in 2004 consistent with the Companys revenue recognition policy. As part of the agreement, Merck also purchased the Companys existing inventory of bulk drug substance for an additional $6.0 million during January 2005.
The Company reviewed the factors surrounding this purchase and determined that since title had not passed until 2005, the related revenue was recognized in the first quarter of 2005. The Company will also be eligible to receive up to an additional
$65.0 million in milestone payments upon achievement of certain targeted regulatory and commercial events, as well as royalties on Mercks sales of intranasal pleconaril in the licensed territories.

GlaxoSmithKline Agreement

In August 2003, the Company announced the acquisition of worldwide rights (excluding Japan) from GlaxoSmithKline (GSK) to an antiviral compound (Maribavir, maribavir, or VP41263) that is an inhibitor of cytomegalovirus (CMV). The Company
plans to advance maribavir initially for the prevention and treatment of CMV infection in transplant patients.

Under the terms of the
agreement, the Company has exclusive worldwide rights (excluding Japan) to develop and commercialize maribavir for the prevention and treatment of cytomegalovirus infections related to transplant (including solid organ and hematopoietic stem cell
transplantation), congenital transmission, and in patients with HIV infection. The Company will focus initially on patients who have received a hematopoietic stem cell (bone marrow) transplant, and are at risk for or have been infected with CMV. The
Company paid GSK a $3.5 million up-front licensing fee and may pay additional milestones based upon the achievement of defined clinical



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ViroPharma Incorporated

Notes to the Consolidated Financial Statements(Continued)



development and regulatory events, if any. The Company also will pay royalties to GSK and its licensor on product sales in the U.S. and the rest of the world (excluding Japan). The $3.5 million
up-front licensing fee was recorded as an acquisition of technology rights expense during 2003 as the underlying technology has not reached technological feasibility and has no alternative uses. In the third quarter of 2006, a milestone related to
the initiation of the phase 3 study occurred and $3.0 million was charged to research and development and paid in February 2007.

Other Agreements

The Company has entered into various other licensing, research and other agreements. Under these other
agreements, the Company is working in collaboration with various other parties. Should any discoveries be made under such arrangements, the Company would be required to negotiate the licensing of the technology for the development of the respective
discoveries. There are no significant funding commitments under any of these other agreements.

Note 11. Stockholders Equity

Preferred Stock

The Companys Board of Directors has the authority, without action by the holders of common stock, to issue up to 4,800,000 shares of preferred stock from time to time in such series and with such
preference and rights as it may designate.

Note 12. Share-based Compensation

The Company adopted the new accounting provisions for share-based compensation as of January 1, 2006 using the modified prospective method. This
adoption primarily resulted in a change in the Companys method of measuring and recognizing the cost of grants under the Employee Stock Option Plans and Employee Stock Purchase Plan to a fair value method and estimating forfeitures for all
unvested awards. Results for prior periods have not been restated. Prior to the adoption of the standard, the Company presented all tax benefits of deductions resulting from the exercise of stock options as operating cash flows. The new provisions
require the cash flows resulting from tax benefits in excess of the compensation cost recognized for those options (excess tax benefits) be classified as financing cash flows.

The Company estimates forfeiture rates for all share-based awards. The Company monitors stock options exercises and employee termination patterns in estimating the forfeiture rate.

Additionally, in accordance with GAAP, share-based payment expense has been included in both research and development expense (R&D) and selling, general
and administrative expense (SG&A). Share-based compensation expense consisted of the following for the year ended December 31, 2009 and 2008:



|                             |  |      |       |   |      |   |       |  |   |        |   |      |   |       |  |   |       |  |   |      
|---------------------------- |  | ---- | ----- | - | ---- | - | ----- |  | - | ------ | - | ---- | - | ----- |  | - | ----- |  | - | -----
|(in thousands)               |  | 2009 |       |   | 2008
|Plan                         |  | R&D  |       |   | SG&A |   | Total |  |   | R&D    |   | SG&A |   | Total
|Employee Stock Option Plans  |  | $    | 3,113 |   |      |   | 8,445 |  | $ | 11,558 |   |      | $ | 2,948 |  | $ | 5,899 |  | $ | 8,847
|Employee Stock Purchase Plan |  |      | 90    |   |      |   | 180   |  |   | 270    |   |      |   | 57    |  |   | 28    |  |   | 85   
|Non-employee Stock Options   |  |      | (11   | ) |      |   |      |  |   | (11    | ) |      |   | 6     |  |   |      |  |   | 6    
|                             |  |      |       |   |      |   |       |  |   |        |   |      |   |       |  |   |       |  |   |      
|Total                        |  | $    | 3,192 |   |      | $ | 8,625 |  | $ | 11,817 |   |      | $ | 3,011 |  | $ | 5,927 |  | $ | 8,938
|                             |  |      |       |   |      |   |       |  |   |        |   |      |   |       |  |   |       |  |   |      

No amounts of share-based compensation cost have been capitalized into
inventory or other assets during the years ended December 31, 2009 and 2008.



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ViroPharma Incorporated

Notes to the Consolidated Financial Statements(Continued)



Employee Stock Option Plans

The Company currently has three option plans in place: a 1995 Stock Option and Restricted Share Plan (1995 Plan), a 2001 Equity Incentive Plan (2001 Plan) and a 2005 Stock Option and Restricted Share Plan (2005
Plan) (collectively, the Plans). In September 2005, the 1995 Plan expired and no additional grants will be issued from this plan. The Plans were adopted by the Companys board of directors to provide eligible individuals with
an opportunity to acquire or increase an equity interest in the Company and to encourage such individuals to continue in the employment of the Company.

Stock options granted under the 2005 Plan must be granted at an exercise price not less than the fair value of the Companys common stock on the date of grant. Stock options granted under the 2001
Plan can be granted at an exercise price that is less than the fair value of the Companys common stock at the time of grant. Stock options granted under the 1995 Plan were granted at an exercise price not less than the fair value of the
Companys common stock on the date of grant. Stock options granted from the Plans are exercisable for a period not to exceed ten years from the date of grant. Vesting schedules for the stock options vary, but generally vest 25% per year,
over four years. Shares issued under the Plans are new shares. The Plans provide for the delegation of certain administrative powers to a committee comprised of company officers.

Options granted during the 2009, 2008 and 2007 had weighted average fair values of $6.73, $7.66 and $11.30 per option. The fair value of each option grant was estimated throughout the year using the
Black-Scholes option-pricing model using the following assumptions for the Plans:



|                                         |  |               |  |               |  |              
|---------------------------------------- |  | ------------- |  | ------------- |  | -------------
|                                         |  | 2009          |  | 2008          |  | 2007         
|Expected dividend yield                  |  |              |  |              |  |             
|Range of risk free interest rate         |  | 1.6%  3.4%   |  | 1.9%  3.7%   |  | 3.7%  5.1%  
|Weighted-average volatility              |  | 77.2%         |  | 87.0%         |  | 92.7%        
|Range of volatility                      |  | 71.5%  79.9% |  | 76.6%  90.2% |  | 90.2%  94.6%
|Range of expected option life (in years) |  | 5.50  6.25   |  | 5.50  6.25   |  | 5.50  6.25  

Risk free
interest rate is based on the U.S. Treasury yield curve in effect at the time of grant. Volatility is based on the Companys historical stock price using the expected life of the grant. Expected life is based upon the short-cut method.

On May 23, 2008, the 2005 Plan was amended and an additional 5,000,000 shares of common stock was reserved for issuance upon the
exercise of stock options or the grant of restricted shares or restricted share units. This amendment was approved by stockholders at our Annual Meeting of Stockholders. As of December 31, 2009, there were 2,963,028 shares available for grant
under the Plans. The following table lists the balances available by Plan at December 31, 2009:



|                                            |  |            |   |  |            |   |  |            |   |  |             |  
|------------------------------------------- |  | ---------- | - |  | ---------- | - |  | ---------- | - |  | ----------- | -
|                                            |  | 1995 Plan  |   |  | 2001 Plan  |   |  | 2005 Plan  |   |  | Combined    |  
|Number of shares authorized                 |  | 4,500,000  |   |  | 500,000    |   |  | 7,850,000  |   |  | 12,850,000  |  
|Number of options granted since inception   |  | (6,997,515 | ) |  | (1,255,472 | ) |  | (5,425,862 | ) |  | (13,678,849 | )
|Number of options cancelled since inception |  | 3,004,308  |   |  | 818,094    |   |  | 511,459    |   |  | 4,333,861   |  
|Number of shares expired                    |  | (506,793   | ) |  | (6,147     | ) |  | (29,044    | ) |  | (541,984    | )
|                                            |  |            |   |  |            |   |  |            |   |  |             |  
|Number of shares available for grant        |  |           |   |  | 56,475     |   |  | 2,906,553  |   |  | 2,963,028   |  
|                                            |  |            |   |  |            |   |  |            |   |  |             |  



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ViroPharma Incorporated

Notes to the Consolidated Financial Statements(Continued)



The following table lists option grant activity for the year ended December 31, 2009:



|                             |  |              |   |  |                                        |      
|---------------------------- |  | ------------ | - |  | -------------------------------------- | -----
|                             |  | ShareOptions |   |  | Weightedaverageexercise priceper share
|Balance at December 31, 2006 |  | 3,919,422    |   |  | $                                      | 9.93 
|Granted                      |  | 1,303,590    |   |  |                                        | 14.36
|Exercised                    |  | (111,677     | ) |  |                                        | 4.70 
|Forfeited                    |  | (52,520      | ) |  |                                        | 13.37
|Expired                      |  | (84,825      | ) |  |                                        | 14.01
|                             |  |              |   |  |                                        |      
|Balance at December 31, 2007 |  | 4,973,990    |   |  |                                        | 11.10
|Granted                      |  | 1,609,635    |   |  |                                        | 10.29
|Exercised                    |  | (112,159     | ) |  |                                        | 3.20 
|Forfeited                    |  | (115,914     | ) |  |                                        | 12.81
|Expired                      |  | (53,838      | ) |  |                                        | 17.05
|                             |  |              |   |  |                                        |      
|Balance at December 31, 2008 |  | 6,301,714    |   |  |                                        | 10.95
|Granted                      |  | 1,571,009    |   |  |                                        | 9.94 
|Exercised                    |  | (51,125      | ) |  |                                        | 10.67
|Forfeited                    |  | (167,062     | ) |  |                                        | 11.72
|Expired                      |  | (64,341      | ) |  |                                        | 16.13
|                             |  |              |   |  |                                        |      
|Balance at December 31, 2009 |  | 7,590,195    |   |  | $                                      | 10.68
|                             |  |              |   |  |                                        |      

The total intrinsic value of share options exercised during the year
ended December 31, 2009, 2008 and 2007 was approximately $0.1 million, $0.7 million, and $0.8 million, respectively.

We have 7,590,195
option grants outstanding at December 31, 2009 with exercise prices ranging from $0.99 per share to $38.70 per share and a weighted average remaining contractual life of 6.55 years. The following table lists the outstanding and exercisable
option grants as of December 31, 2009:



|            |  |                  |  |                               |       |                                                 |      |                                        |   |           
|----------- |  | ---------------- |  | ----------------------------- | ----- | ----------------------------------------------- | ---- | -------------------------------------- | - | ----------
|            |  | Number ofoptions |  | Weightedaverageexercise price |       | Weightedaverageremainingcontractualterm (years) |      | Aggregateintrinsic value(in
thousands)
|Outstanding |  | 7,590,195        |  | $                             | 10.71 |                                                 | 6.55 |                                        | $ | 10,619,796
|Exercisable |  | 4,272,839        |  | $                             | 10.50 |                                                 | 5.06 |                                        | $ | 8,824,288 

As of December 31, 2009,
there was $17.5 million of total unrecognized compensation cost related to unvested share-based payments (including share options) granted under the Plans. That cost is expected to be recognized over a weighted-average period of 2.4 years. The total
fair value of shares vested in the year ended December 31, 2009 was $9.7 million.

Employee Stock Purchase Plan

In 2000, the stockholders of the Company approved an employee stock purchase plan. A total of 300,000 shares originally were available
under this plan. Since inception of the plan, the stockholders of the Company have approved amendments to the plan to increase the number of shares available for issuance under the plan by 600,000 shares. Under this plan, 69,806, 24,478 and 18,908
shares were sold to employees during 2009, 2008 and 2007. As of December 31, 2009 there are approximately 478,969 shares available for issuance under this plan.



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ViroPharma Incorporated

Notes to the Consolidated Financial Statements(Continued)



Under this plan, employees may purchase common stock through payroll deductions in semi-annual offerings at a price equal to the lower of 85% of the closing
price on the applicable offering commencement date or 85% of the closing price on the applicable offering termination date. Since the total payroll deductions from the plan period are used to purchase shares at the end of the offering period, the
number of shares ultimately purchased by the participants is variable based upon the purchase price. Shares issued under the employee stock purchase plan are new shares. There are two plan periods: January 1 through June 30 (Plan
Period One) and July 1 through December 31 (Plan Period Two). The plan qualifies under Section 423 of the Internal Revenue Code.

The fair value of the share-based payments was approximately $270,000. The fair value was estimated using the Type B model, with the following assumptions:



|                                |  |                     |   |  |                     |  
|------------------------------- |  | ------------------- | - |  | ------------------- | -
|                                |  | 2009 Plan PeriodTwo |   |  | 2009 Plan PeriodOne |  
|Risk free interest rate         |  | 0.28                | % |  | 0.28                | %
|Volatility                      |  | 123.30              | % |  | 76.10               | %
|Expected option life (in years) |  | 0.5                 |   |  | 0.5                 |  

Under Plan Period Two, 37,378
shares were sold to employees on December 31, 2009 at $5.08 per share, which represents the closing price on the offer termination date of $5.98 per share at 85%.

Under Plan Period One, 34,428 shares were sold to employees on June 30, 2009 at $11.59 per share, which represents the closing price on the offer termination date of $13.63 per share at 85%.

The fair value of the non-employee share options was estimated using the Black-Scholes option-pricing model using the following range of
assumptions:



|                                   |  |                  |  |                  |  |                 
|---------------------------------- |  | ---------------- |  | ---------------- |  | ----------------
|                                   |  | December 31,2009 |  | December 31,2008 |  | December 31,2007
|Expected dividend yield            |  |                 |  |                 |  |                
|Range of risk free interest rate   |  | 0.2%  1.1%      |  | 0%  1.0%        |  | 2.6%  3.5%     
|Weighted average volatility        |  | 67.40%           |  | 57.90%           |  | 50.30%          
|Range of volatility                |  | 51.8%  84.4%    |  | 44.0%  66.8%    |  | 50.3%  69.3%   
|Contractual option life (in years) |  | 0.53  2.28      |  | 0.04  3.29      |  | 0.13  4.29     

There
were no non-employee share options vested or exercised during the year ended December 31, 2009 or 2008. Shares issued to non-employees upon exercise of stock options are new shares.



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ViroPharma Incorporated

Notes to the Consolidated Financial Statements(Continued)



Note 13. Income Taxes

For the years ended
December 31, 2009, 2008 and 2007, the following table summarizes the components of income (loss) before income taxes and the provision (benefit) for income taxes:



|                                    |  |                         |        |   |      |   |        |      |  |   |         |  
|----------------------------------- |  | ----------------------- | ------ | - | ---- | - | ------ | ---- |  | - | ------- | -
|                                    |  | Year ended December 31, |       
|(in thousands)                      |  | 2009                    |        |   | 2008 |   |        | 2007 | 
|Domestic                            |  |                         | 37,020 |   |      |   | 79,406 |      |  |   | 130,371 |  
|Foreign                             |  |                         | (7,068 | ) |      |   | 594    |      |  |   | 78      |  
|                                    |  |                         |        |   |      |   |        |      |  |   |         |  
|Income before income taxes          |  | $                       | 29,952 |   |      | $ | 80,000 |      |  | $ | 130,449 |  
|                                    |  |                         |        |   |      |   |        |      |  |   |         |  
|Expense (benefit) for income taxes: |  |                         |        |   |      |   |        |      |  |   |         |  
|Current:                            |  |                         |        |   |      |   |        |      |  |   |         |  
|Federal                             |  |                         | 7,614  |   |      |   | 145    |      |  |   | 21,216  |  
|State and local                     |  |                         | 4,018  |   |      |   | 3,763  |      |  |   | 4,264   |  
|Foreign                             |  |                         | 16     |   |      |   | 209    |      |  |   | 68      |  
|                                    |  |                         |        |   |      |   |        |      |  |   |         |  
|Subtotal                            |  |                         | 11,648 |   |      |   | 4,117  |      |  |   | 25,548  |  
|                                    |  |                         |       
|Deferred:                           |  |                         |        |   |      |   |        |      |  |   |         |  
|Federal                             |  |                         | 21,588 |   |      |   | 11,123 |      |  |   | 12,268  |  
|State and local                     |  |                         | 10,684 |   |      |   | 431    |      |  |   | 576     |  
|Foreign                             |  |                         | (2,891 | ) |      |   | 369    |      |  |   | (43     | )
|                                    |  |                         |        |   |      |   |        |      |  |   |         |  
|Subtotal                            |  |                         | 29,381 |   |      |   | 11,923 |      |  |   | 12,796  |  
|                                    |  |                         |        |   |      |   |        |      |  |   |         |  
|Income tax expense                  |  | $                       | 41,029 |   |      | $ | 16,040 |      |  | $ | 38,344  |  
|                                    |  |                         |        |   |      |   |        |      |  |   |         |  
|Effective income tax rate           |  |                         | 137.0  | % |      |   | 20.1   | %    |  |   | 29.4    | %

Income tax expense includes federal, state
and foreign income tax at statutory rates and the effects of various permanent differences. The increase in the 2009 rate as compared to 2008 is primarily due to the impact of the goodwill impairment recognized in the first quarter of 2009. The
decrease in the 2008 rate as compared to 2007 is primarily due to the impact of the orphan drug credit for maribavir and includes the benefit of an additional reduction of the valuation allowance to establish deferred tax assets in 2008.

For the year ended December 31, 2009, 2008 and 2007, the following table summarizes the principal elements of the difference between the effective
income tax rate and the federal statutory income tax rate:



|                                                             |  |                         |   |  |       |   |  |      |  
|------------------------------------------------------------ |  | ----------------------- | - |  | ----- | - |  | ---- | -
|                                                             |  | Year ended December 31, |  
|(% of pre-tax income)                                        |  | 2009                    |   |  | 2008  |   |  | 2007 |  
|U.S. federal statutory income tax rate                       |  | 35.0                    | % |  | 35.0  | % |  | 35.0 | %
|State and local income tax, net of federal income tax effect |  | 44.3                    |   |  | 3.6   |   |  | 2.6  |  
|Share-based compensation                                     |  | 5.0                     |   |  | 1.3   |   |  | 0.8  |  
|Orphan drug credit                                           |  | (20.5                   | ) |  | (16.0 | ) |  | (5.8 | )
|Change in valuation allowance                                |  | (1.6                    | ) |  | (3.8  | ) |  | (2.9 | )
|Goodwill impairment                                          |  | 75.8                    |   |  |      |   |  |     |  
|Other                                                        |  | (1.0                    | ) |  |      |   |  | (0.3 | )
|                                                             |  |                         |   |  |       |   |  |      |  
|Effective income tax expense rate                            |  | 137.0                   | % |  | 20.1  | % |  | 29.4 | %
|                                                             |  |                         |   |  |       |   |  |      |  



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ViroPharma Incorporated

Notes to the Consolidated Financial Statements(Continued)



In 2009, 2008 and 2007, the Company recorded $0.1 million, $0.2 million and $0.3 million related to current stock option tax benefits allocated directly to
stockholders equity, respectively.

The following table summarizes the components of deferred income tax assets and liabilities:



|                                             |  |              |          |   |      |   |          |  
|-------------------------------------------- |  | ------------ | -------- | - | ---- | - | -------- | -
|                                             |  | December 31, |         
|(in thousands)                               |  | 2009         |          |   | 2008 |  
|Deferred tax assets:                         |  |              |          |   |      |   |          |  
|Net operating loss carryforwards             |  | $            | 15,755   |   |      | $ | 44,409   |  
|Capitalized research and development costs   |  |              | 11,339   |   |      |   | 17,630   |  
|Orphan drug credit carryforward              |  |              | 24,036   |   |      |   | 16,733   |  
|Research and development credit carryforward |  |              | 6,840    |   |      |   | 6,840    |  
|Non-deductible reserves                      |  |              | 3,593    |   |      |   | 1,502    |  
|Depreciation                                 |  |              | 1,518    |   |      |   | 438      |  
|Intangible asset amortization                |  |              | 7,687    |   |      |   | 7,839    |  
|Equity compensation                          |  |              | 7,684    |   |      |   | 4,918    |  
|Other                                        |  |              |         |   |      |   | 3,034    |  
|                                             |  |              |          |   |      |   |          |  
|Subtotal                                     |  |              | 78,452   |   |      |   | 103,342  |  
|Valuation allowance                          |  |              | (5,949   | ) |      |   | (6,436   | )
|                                             |  |              |          |   |      |   |          |  
|Deferred tax assets                          |  |              | 72,503   |   |      |   | 96,906   |  
|                                             |  |             
|Deferred tax liabilities:                    |  |              |          |   |      |   |          |  
|Intangible asset amortization                |  |              | 197,731  |   |      |   | 193,846  |  
|Convertible note                             |  |              | 2,553    |   |      |   | 3,352    |  
|Inventory                                    |  |              |         |   |      |   | 2,691    |  
|Prepaid expenses                             |  |              | 1,084    |   |      |   | 1,071    |  
|Other                                        |  |              | 3,573    |   |      |   |         |  
|                                             |  |              |          |   |      |   |          |  
|Deferred tax liabilities                     |  |              | 204,941  |   |      |   | 200,960  |  
|                                             |  |              |          |   |      |   |          |  
|Net deferred tax assets (liability)          |  | $            | (132,438 | ) |      | $ | (104,054 | )
|                                             |  |              |          |   |      |   |          |  

At December 31, 2008 and 2007, deferred tax assets and liabilities were classified on the Companys balance sheets
follows:



|                                    |  |              |          |   |      |   |          |  
|----------------------------------- |  | ------------ | -------- | - | ---- | - | -------- | -
|                                    |  | December 31, |         
|(in thousands)                      |  | 2009         |          |   | 2008 |  
|Current assets                      |  | $            | 20,065   |   |      | $ | 24,094   |  
|Other non-current liabilities       |  |              | (152,503 | ) |      |   | (128,148 | )
|                                    |  |              |          |   |      |   |          |  
|Net deferred tax assets (liability) |  | $            | (132,438 | ) |      | $ | (104,054 | )
|                                    |  |              |          |   |      |   |          |  



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ViroPharma Incorporated

Notes to the Consolidated Financial Statements(Continued)



The following table summarizes the change in the valuation allowance:



|                                                |  |                         |       |   |      |   |         |      |  |   |        |  
|----------------------------------------------- |  | ----------------------- | ----- | - | ---- | - | ------- | ---- |  | - | ------ | -
|                                                |  | Year ended December 31, |      
|(in thousands)                                  |  | 2009                    |       |   | 2008 |   |         | 2007 | 
|Valuation allowance at beginning of year        |  | $                       | 6,436 |   |      | $ | 38,742  |      |  | $ | 48,278 |  
|Tax expense (benefit)                           |  |                         | (487  | ) |      |   | (4,087  | )    |  |   | (4,028 | )
|Additional paid in capital                      |  |                         |      |   |      |   |        |      |  |   | (120   | )
|Reduction of deferred tax asset                 |  |                         |      |   |      |   |        |      |  |   | (1,725 | )
|Adoption of new accounting for convertible debt |  |                         |      |   |      |   | (28,219 | )    |  |   | (3,663 | )
|                                                |  |                         |       |   |      |   |         |      |  |   |        |  
|Valuation allowance at end of year              |  | $                       | 5,949 |   |      | $ | 6,436   |      |  | $ | 38,742 |  
|                                                |  |                         |       |   |      |   |         |      |  |   |        |  

Due to the uncertainty of the Companys ability to realize the benefit of all of the deferred tax assets, the deferred
tax assets are partially offset by a valuation allowance. The Company believes that it is more likely than not that the remaining net deferred tax assets will be utilized in future periods due to our future projections of taxable income, the
reversal of deferred tax liabilities, the utilization of the carryforwards and other factors. We continue to maintain a valuation allowance for state net operating losses that are more likely than not to expire unused based on current limitations.

The Company has a cumulative unremitted loss from foreign subsidiaries. Future unremitted foreign earning are intended to be permanently
reinvested for continued use in foreign operations and that, if distributed, would result in taxes at approximately the U.S. statutory rate.

The following table summarizes carryforwards of net operating losses and tax credits as of December 31, 2009.



|                                 |  |        |         |            |          
|-------------------------------- |  | ------ | ------- | ---------- | ---------
|(in thousands)                   |  | Amount |         | Expiration
|Federal net operating losses     |  | $      | 11,533  |            | 2024-2028
|State net operating losses       |  |        | 173,536 |            | 2019-2028
|Orphan drug credits              |  |        | 24,036  |            | 2025-2028
|Research and development credits |  |        | 8,565   |            | 2010-2027

On January 1, 2007,
the Company adopted the pronouncement for recognizing tax benefits related to uncertain tax positions and the additional financial statement disclosure. This pronouncement requires that the Company recognizes in its consolidated financial statements
the impact of a tax position if that position is more likely than not to be sustained upon examination, based on the technical merits of the position. Adoption of this pronouncement had no net impact on the Companys consolidated results of
operations and financial position.

Upon adoption, the Company identified $1.7 million of uncertain tax positions that the Company currently
does not believe meet the more likely than not recognition threshold to be sustained upon examination. Since these tax positions have not been utilized and have a related full valuation allowance established, the Company reduced its gross deferred
tax asset and valuation allowance by $1.7 million. This amount relates to unrecognized tax benefits that would impact the effective tax rate if recognized absent the valuation allowance.

The Company does not expect any material increase or decrease in its income tax expense, in the next twelve months, related to examinations or changes in uncertain tax positions.



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ViroPharma Incorporated

Notes to the Consolidated Financial Statements(Continued)



The following is a rollforward of our uncertain tax positions for the year ended December 31, 2009:



|                                               |  |                |        |  
|---------------------------------------------- |  | -------------- | ------ | -
|                                               |  | (in thousands) |       
|Balance at January 1, 2007                     |  | $              |       |  
|Additions for tax positions of prior years     |  |                | 1,133  |  
|                                               |  |                |        |  
|Balance at December 31, 2007                   |  |                | 1,113  |  
|Additions for tax positions of prior years     |  |                | 76     |  
|                                               |  |                |        |  
|Balance at December 31, 2008                   |  |                | 1,209  |  
|Additions for tax positions of prior years     |  |                |       |  
|Payments made to settle uncertain tax position |  |                | (1,209 | )
|                                               |  |                |        |  
|Balance at December 31, 2009                   |  | $              |       |  
|                                               |  |                |        |  

The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction, in various states and foreign
jurisdictions. The Company could be subject to U.S. federal or state income tax examinations by tax authorities for years ended after 2004. The Companys has various state returns are currently under examination. The final outcome of these
reviews is not yet determinable. During the periods open to examination, the Company has utilized net operating loss and tax credit carry forwards that have attributes from closed periods. Since these NOLs and credit carry forwards were utilized in
the open periods, they remain subject to examination.

The Companys policy is to record interest and penalties on uncertain tax
positions as income tax expense.

Note 14. Earnings (Loss) per share



|                                                                    |  |                                  |         |   |      |   |        |  |   |       
|------------------------------------------------------------------- |  | -------------------------------- | ------- | - | ---- | - | ------ |  | - | ------
|                                                                    |  | For the years ended December 31,
|(in thousands, except per share data)                               |  | 2009                             |         |   | 2008 |   | 2007  
|Basic Earnings (Loss) Per Share                                     |  |                                  |         |   |      |   |        |  |   |       
|Net income (loss)                                                   |  | $                                | (11,077 | ) |      | $ | 63,960 |  | $ | 92,105
|Common stock outstanding (weighted average)                         |  |                                  | 77,423  |   |      |   | 71,391 |  |   | 69,827
|                                                                    |  |                                  |         |   |      |   |        |  |   |       
|Basic net income (loss) per share                                   |  | $                                | (0.14   | ) |      | $ | 0.90   |  | $ | 1.32  
|                                                                    |  |                                  |         |   |      |   |        |  |   |       
|Diluted Earnings (Loss) Per Share                                   |  |                                  |         |   |      |   |        |  |   |       
|Net income (loss)                                                   |  | $                                | (11,077 | ) |      | $ | 63,960 |  | $ | 92,105
|Add interest expense on senior convertible notes, net of income tax |  |                                  |        |   |      |   | 7,994  |  |   | 5,982 
|                                                                    |  |                                  |         |   |      |   |        |  |   |       
|Diluted net income (loss)                                           |  | $                                | (11,077 | ) |      | $ | 71,954 |  | $ | 98,087
|                                                                    |  |                                  |        
|Common stock outstanding (weighted average)                         |  |                                  | 77,423  |   |      |   | 71,391 |  |   | 69,827
|Add shares from senior convertible notes                            |  |                                  |        |   |      |   | 13,248 |  |   | 10,200
|Add in-the-money stock options                                    |  |                                  |        |   |      |   | 1,073  |  |   | 864   
|                                                                    |  |                                  |         |   |      |   |        |  |   |       
|Common stock assuming conversion and stock option exercises         |  |                                  | 77,423  |   |      |   | 85,712 |  |   | 80,891
|                                                                    |  |                                  |         |   |      |   |        |  |   |       
|Diluted net income (loss) per share                                 |  | $                                | (0.14   | ) |      | $ | 0.84   |  | $ | 1.21  
|                                                                    |  |                                  |         |   |      |   |        |  |   |       



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ViroPharma Incorporated

Notes to the Consolidated Financial Statements(Continued)



The following common shares that are associated with stock options were excluded from the calculations as their effect would be anti-dilutive:



|                                     |  |                                  |  |       |  |      
|------------------------------------ |  | -------------------------------- |  | ----- |  | -----
|                                     |  | For the years ended December 31,
|(in thousands)                       |  | 2009                             |  | 2008  |  | 2007 
|Out-of-the-money stock options     |  | 5,034                            |  | 4,447 |  | 4,074
|Shares from senior convertible notes |  | 11,406                           |  |      |  |     
|In-the-money stock options         |  | 849                              |  |      |  |     

Note 15. Fair Value
Measurement

Valuation HierarchyGAAP establishes a valuation hierarchy for disclosure of the inputs to valuation used to measure fair
value. This hierarchy prioritizes the inputs into three broad levels as follows. Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities. Level 2 inputs are quoted prices for similar assets and liabilities
in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument. Level 3 inputs are unobservable inputs based on our
own assumptions used to measure assets and liabilities at fair value. A financial asset or liabilitys classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement.

The following table provides the assets and liabilities carried at fair value measured on a recurring basis as of December 31, 2009:



|                          |  |                                        |           |                                                    |           |         |           |   |   |  |   |  
|------------------------- |  | -------------------------------------- | --------- | -------------------------------------------------- | --------- | ------- | --------- | - | - |  | - | -
|                          |  | Total CarryingValue atDecember 31,2009 |           | Fair Value Measurements at December 31, 2009 Using
|(in millions of dollars)  |  |                                        | (Level 1) |                                                    | (Level 2) |         | (Level 3)
|Cash and cash equivalents |  | $                                      | 331,672   |                                                    | $         | 331,672 |           | $ |  |  | $ | 
|                          |  |                                        |           |                                                    |           |         |           |   |   |  |   |  
|Total                     |  | $                                      | 331,672   |                                                    | $         | 331,672 |           | $ |  |  | $ | 
|                          |  |                                        |           |                                                    |           |         |           |   |   |  |   |  

Valuation TechniquesCash and cash equivalents are measured
at fair value using quoted market prices and are classified within Level 1 of the valuation hierarchy. All of our cash equivalents currently are invested in money market accounts. There were no changes in valuation techniques during the quarter
ended December 31, 2009.

During 2009, we adjusted the carrying value of our previous corporate headquarters to its fair value due to the
reclassification of the asset from available for sale to held and use due to our decision to lease the building and have taken it off the market. We measured the fair value of the building using level 3 inputs including discounted cash flows for the
rental of the building would generate in future periods and residual capitalization rates that a market participant would be willing to pay to purchase the building given an existing lease. In 2008, we measured the fair value of the building based
on the then current sales price less cost to sell.

Additionally, during the first quarter of 2009 and as of March 31, 2009, the market
capitalization of the Company fell below the carrying value of our net assets due to the results of our Phase 3 clinical trial evaluating. The fact that our market capitalization fell below our carrying value required us to test for impairment of
our goodwill and other intangible assets. We conducted this analysis at March 31, 2009 using our then current stock price and level 3 inputs which included a control premium based on market transactions and discounted cash flows for certain
assets. We concluded that our goodwill was impaired due to our market capitalization including control premium



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Notes to the Consolidated Financial Statements(Continued)



being below the carrying value of our net assets for an extended period of time. We incurred a $65.1 million charge in the first quarter related to this goodwill impairment.

We believe that the fair values of our current assets and current liabilities approximate their reported carrying amounts.

Note 16. 401(k) Employee Savings Plan

The
Companys 401(k) Employee Savings Plan (the 401(k) Plan) is available to all employees meeting certain eligibility criteria. The 401(k) Plan permits participants to contribute up to 92% of their compensation not to exceed the limits
established by the Internal Revenue Code. Participants are always fully vested in their contributions. The Company matches of 25% on the first 6% of participating employee contributions. The Company contributed approximately $413,000, $214,000 and
$114,000 to the 401(k) Plan in each of the years ended December 31, 2009, 2008 and 2007, respectively. The Companys contributions are made in cash. The Companys common stock is not an investment option available to participants in
the 401(k) Plan.

Note 17. Commitments and Contingencies

We have committed to purchase up to 140,000 liters of plasma per year through 2015 from our supplier. Additionally, we are required to purchase a minimum number of units from our third party toll
manufacturer. Also, an additional 5.0 million (approximately $7.2 million) loan will be made to Sanquin in 2010.

In March 2008, we
entered into a lease, comprising 78,264 square feet of office and related space, for the Companys new headquarters located in Exton, Pennsylvania. The lease expires seven years and six months from the point in which we began to occupy the
space, which was in the fourth quarter of 2008. In connection with the new lease, we also received a leasehold improvement allowance of $2.3 million.

Our future minimum lease payments under our operating leases related to buildings and equipment for periods subsequent to December 31, 2009 are as follows (in thousands):



|                         |  |             |       
|------------------------ |  | ----------- | ------
|Year ending December 31, |  | Commitments
|2010                     |  |             | 1,656 
|2011                     |  |             | 1,776 
|2012                     |  |             | 1,805 
|2013                     |  |             | 1,845 
|2014                     |  |             | 1,886 
|Thereafter               |  |             | 3,470 
|                         |  |             |       
|Total minimum payments   |  | $           | 12,438
|                         |  |             |       

We have severance agreements for certain employees and change of
control agreements for executive officers and certain other employees. Under its severance agreements, certain employees may be provided separation benefits from us if they are involuntarily separated from employment. Under our change of control
agreements, certain employees are provided separation benefits if they are either terminated or resign for good reason from ViroPharma within 12 months from a change of control.

In addition to the merger consideration paid at closing as described in Note 10, Lev shareholders received the non-transferrable contractual right to two contingent payments (CVR Payments) of
$0.50 each that could deliver up to an additional $174.6 million, or $1.00 per share in cash, if Cinryze meets certain targets. As of



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Notes to the Consolidated Financial Statements(Continued)



December 31, 2009, only the second CVR as described below remains achievable. The target for the first CVR payment of $0.50 per share (or $87.5 million) is no longer achievable and will not
be paid as during the fourth quarter of 2009, a third partys human C1 inhibitor product was approved for the acute treatment of HAE and granted orphan exclusivity. The second CVR payment of $0.50 per share ($87.5 million) becomes payable if
Cinryze reaches at least $600 million in cumulative net product sales by October 2018.

Note 18. Collaborations

In January 2010, we entered into a collaboration agreement with Sanquin to establish a Joint Steering Committee. The Joint Steering Committee shall serve as
a forum to establish and discuss progress under, among others, (i) a Global Commercialization Plan; (ii) clinical development programs of ViroPharma and the Sanquin Early Stage Research Programs; (iii) manufacturing Capacity
Schedules; (iv) pharmacovigilence matters; (v) quality matters; (vi) manufacturing improvement programs; and (vii) regulatory matters.

Sanquin may conduct certain early stage research programs and we will provide to Sanquin 1,000,000 (approximately $1.4 million) per year for a period of five years to support such Early Stage
Research Programs. We have a right of first refusal to further develop and commercialize the subject matter of each such Early Stage Research Program worldwide (except for the Excluded Territory) subject to Sanquins and its research
partners right to use any such intellectual property for their internal, non-commercial research purposes. Except for the Early Stage Research Programs, we will be solely responsible for conducting all clinical trials and other development
activities necessary to support our efforts to obtain regulatory approval of Cinryze in additional territories as well as any future C1-INH derived products developed pursuant to the Rest of World Agreement. Sanquin has the right to approve any such
clinical trials and development activities through the Joint Steering Committee.

On January 1, 2009, we implemented the new accounting
requirements on how parties to a collaborative agreement should disclose costs incurred and revenue generated on sales to third parties, how sharing payments pursuant to a collaboration agreement should be presented in the income statement and
certain related disclosure questions. In accordance with these requirements, we evaluated our collaborative agreements for proper income statement classification based on the nature of the underlying activity. If payments to and from our
collaborative partners are not within the scope of other authoritative accounting literature, the income statement classification for these payments is based on a reasonable, rational analogy to authoritative accounting literature that is applied in
a consistent manner. Amounts due to our collaborative partner related to development activities are reflected as a research and development expense.



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Notes to the Consolidated Financial Statements(Continued)



Note 19. Supplemental Cash Flow Information



|                                                      |  |                                 |        |   |      |   |       
|----------------------------------------------------- |  | ------------------------------- | ------ | - | ---- | - | ------
|                                                      |  | For the years endedDecember 31,
|(in thousands)                                        |  | 2009                            |        |   | 2008
|Supplemental disclosure of non-cash transactions:     |  |                                 |        |   |      |   |       
|Employee share-based compensation                     |  | $                               | 11,828 |   |      | $ | 8,932 
|Liability classified share-based compensation benefit |  |                                 | (11    | ) |      |   | 6     
|Unrealized gains on available for sale securities     |  |                                 |       |   |      |   | 550   
|Reversal of accrued deferred finance costs            |  |                                 |       |   |      |   | 151   
|Change in/ establishment of landlord allowance        |  |                                 | 104    |   |      |   | 2,063 
|Non-cash lease activity                               |  |                                 |       |   |      |   | 573   
|Debt buy back deferred tax impact                     |  |                                 | 308    |   |      |   |      
|Supplemental disclosure of cash flow information:     |  |                                 |        |   |      |   |       
|Cash paid for income taxes                            |  | $                               | 10,466 |   |      | $ | 10,348
|Cash paid for interest                                |  |                                 | 4,550  |   |      |   | 5,000 
|Cash received for stock option exercises              |  |                                 | 22     |   |      |   | 360   
|Cash received for employee stock purchase plan        |  |                                 | 356    |   |      |   | 188   

Note 20. Quarterly Financial
Information (unaudited)

This table summarizes the unaudited consolidated financial results of operations for the quarters ended (amounts
in thousands except per share data):



|                                                         |  |           |         |   |          |   |        |               |  |   |                     |   |  |   |        |  
|-------------------------------------------------------- |  | --------- | ------- | - | -------- | - | ------ | ------------- |  | - | ------------------- | - |  | - | ------ | -
|                                                         |  | March 31, |         |   | June 30, |   |        | September 30, |  |   | December 31, (2)(3) |  
|2009 Quarter Ended                                       |  |           |         |   |          |   |        |               |  |   |                     |   |  |   |        |  
|Net product sales                                        |  | $         | 60,190  |   |          | $ | 81,873 |               |  | $ | 80,551              |   |  | $ | 87,835 |  
|Total revenues                                           |  |           | 60,190  |   |          |   | 81,873 |               |  |   | 80,551              |   |  |   | 87,835 |  
|Cost of sales (excluding amortization of product rights) |  |           | 3,929   |   |          |   | 14,121 |               |  |   | 10,216              |   |  |   | 11,948 |  
|Operating expenses                                       |  |           | 51,319  |   |          |   | 43,503 |               |  |   | 37,910              |   |  |   | 40,274 |  
|Goodwill Impairment                                      |  |           | 65,099  |   |          |   |       |               |  |   |                    |   |  |   |       |  
|Other income (expense)                                   |  |           | 5,914   |   |          |   | (2,572 | )             |  |   | (2,752              | ) |  |   | (2,768 | )
|Income tax expense (benefit)                             |  |           | 4,972   |   |          |   | 5,625  |               |  |   | 9,601               |   |  |   | 20,831 |  
|Net income (loss)                                        |  |           | (59,215 | ) |          |   | 16,052 |               |  |   | 20,072              |   |  |   | 12,014 |  
|Basic net income (loss) per share (1)                    |  | $         | (0.77   | ) |          | $ | 0.21   |               |  | $ | 0.26                |   |  | $ | 0.16   |  
|Diluted net income (loss) per share (1)                  |  | $         | (0.77   | ) |          | $ | 0.20   |               |  | $ | 0.24                |   |  | $ | 0.15   |  
|                                                         |  |           |         |  
|2008 Quarter Ended                                       |  |           |         |   |          |   |        |               |  |   |                     |   |  |   |        |  
|Net product sales                                        |  | $         | 50,937  |   |          | $ | 65,437 |               |  | $ | 65,913              |   |  | $ | 50,020 |  
|Total revenues                                           |  |           | 50,937  |   |          |   | 65,437 |               |  |   | 65,913              |   |  |   | 50,020 |  
|Cost of sales (excluding amortization of product rights) |  |           | 1,918   |   |          |   | 2,386  |               |  |   | 2,460               |   |  |   | 2,110  |  
|Operating expenses                                       |  |           | 29,502  |   |          |   | 33,334 |               |  |   | 30,618              |   |  |   | 51,324 |  
|Other income (expense) (4)                               |  |           | 3,184   |   |          |   | 849    |               |  |   | (142                | ) |  |   | (2,546 | )
|Income tax expense (benefit)                             |  |           | 6,315   |   |          |   | 7,783  |               |  |   | 5,587               |   |  |   | (3,645 | )
|Net income (loss)                                        |  |           | 16,386  |   |          |   | 22,783 |               |  |   | 27,106              |   |  |   | (2,315 | )
|Basic net income (loss) per share (1)                    |  | $         | 0.23    |   |          | $ | 0.33   |               |  | $ | 0.39                |   |  | $ | (0.03  | )
|Diluted net income (loss) per share (1)                  |  | $         | 0.22    |   |          | $ | 0.29   |               |  | $ | 0.34                |   |  | $ | (0.03  | )



|(1) | Net income per share amounts will not agree to the per share amounts for the full year due to the use of weighted average shares for each period.
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Notes to the Consolidated Financial Statements(Continued)



|(2) | Fourth quarter 2008 results include expenses for Cinryze, which was acquired in October in our acquisition of Lev
|--- | -----------------------------------------------------------------------------------------------------------------

|(3) | Fouth quarter 2009 and 2008 includes a impairment charges related to our previous Corporate headquarters.
|--- | ---------------------------------------------------------------------------------------------------------

|(4) | We adopted the new accounting provisions for our convertible debt securities as of January 1, 2009 and retrospectively applied this change in accounting to all
prior periods presented for which we had applicable outstanding convertible debt, as required by this new standard. The adoption is discussed further in Note 3 of the Consolidated Financial Statements.
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