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UNITED STATES
SECURITIES AND EXCHANGE COMMISSIONWashington, D.C. 20549

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FORM 10-K

FOR ANNUAL AND TRANSITION REPORTS PURSUANT TO SECTION 13 OR 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934

|ý | Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
|- | ------------------------------------------------------------------------------------

For the Fiscal Year Ended March 31, 2003

or

|o | 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: 000-31253

Pharsight Corporation(Exact name of Registrant as specified in its charter)

Delaware

77-0401273(State or other jurisdiction of
incorporation or organization)

(I.R.S. Employer
Identification Number)800 W. El Camino Real, Mountain View, CA

94040(Address of principal executive office)

(zip code)


Registrant's telephone number, including area code: (650) 314-3800

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

Title of each class

Name of each exchange
On which registeredNone

None


Securities registered pursuant to Section 12(g) of the Act:
Common Stock, $0.001 par value(Title of Class)

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 ý    No o

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 the
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. o

Indicate
by check mark whether the registrant is an accelerated filer (as defined in Rule 12b-2 of the Exchange
Act). Yes o    No ý

The
aggregate market value of the Common Stock held by non-affiliates of the registrant as of September 30, 2002 was approximately $5,191,208, based on 7,865,466
shares of Common Stock. Excludes shares held by officers and directors and by each person known by the registrant to own 5% or more of the outstanding Common Stock. Exclusion of shares held by any of
these persons should not be construed to indicate that such person possesses the power, direct or indirect, to direct or cause the direction of the management or policies of the registrant, or that
such person is controlled by or under common control with the registrant.

As
of April 30, 2003, the registrant had 19,053,057 shares of Common Stock outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

The Registrant has incorporated by reference into Part III of this Form 10-K portions of its Proxy Statement for Registrant's 2003 Annual
Meeting of Stockholders, to be filed with the Securities and Exchange Commission pursuant to Regulation 14A not later than 120 days after the end of the fiscal year covered by this
Form 10-K.

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TABLE OF CONTENTS

|               |  |                                                                                      |  | Page
|-------------- |  | ------------------------------------------------------------------------------------ |  | ----
|PART I        
|Item 1.        |  | Business                                                                             |  | 3   
|Item 2.        |  | Properties                                                                           |  | 10  
|Item 3.        |  | Legal Proceedings                                                                    |  | 10  
|Item 4.        |  | Submission of Matters to a Vote of Security Holders                                  |  | 10  
|               |  | Additional ItemExecutive Officers of the Registrant                                 |  | 11  
|PART II       
|Item 5.        |  | Market for Registrant's Common Equity and Related Stockholder Matters                |  | 13  
|Item 6.        |  | Selected Financial Data                                                              |  | 13  
|Item 7.        |  | Management's Discussion and Analysis of Financial Condition and Results of Operation |  | 15  
|Item 7A.       |  | Qualitative and Quantitative Disclosures About Market Risks                          |  | 32  
|Item 8.        |  | Financial Statements and Supplementary Data                                          |  | 32  
|Item 9.        |  | Changes In and Disagreements With Accountants on Accounting and Financial Disclosure |  | 66  
|PART III      
|Item 10.       |  | Directors and Executive Officers of the Registrant                                   |  | 66  
|Item 11.       |  | Executive Compensation                                                               |  | 66  
|Item 12.       |  | Security Ownership of Certain Beneficial Owners and Management                       |  | 66  
|Item 13.       |  | Certain Relationships and Related Transactions                                       |  | 68  
|Item 14.       |  | Controls and Procedures                                                              |  | 68  
|PART IV       
|Item 15.       |  | Exhibits, Financial Statement Schedules, and Reports on Form 8-K                     |  | 69  
|Signatures     |  | 73                                                                                  
|Certifications |  | 75                                                                                  

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PART I

FORWARD-LOOKING STATEMENTS

This report on Form 10-K contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as
amended, and Section 21E of the Securities Exchange Act of 1934, as amended, which are subject to the "safe harbor" created by those sections. These forward-looking statements are generally
identified by words such as "expect," "anticipate," "intend," "plan," "believe," "hope," "can," "continue," "may," "could," "potential," "assume," "estimate" and other similar words and expressions.
These forward-looking statements involve risks and uncertainties that could cause our actual results to differ materially from those in the forward-looking statements, including, without limitation,
the business risks discussed under the caption "Item 7Management's Discussion and Analysis of Financial Condition and Results of OperationBusiness Risks" in this report on
Form 10-K. These business risks should be considered in evaluating our prospects and future financial performance. Our expectations are as of the date we file this
Form 10-K, and we do not intend to update any of the forward-looking statements after the date we file this Annual Report on Form 10-K to conform these statements
to actual results, unless required by law.

ITEM 1. BUSINESS

Overview

Pharsight Corporation develops and markets integrated products and services that help pharmaceutical and biotechnology companies improve the drug development
process. Our products and services combine proprietary computer-based simulation, statistical and data analysis tools with strategic decision-making and the sciences of pharmacology, medicine and
biostatistics.

We
believe our products and services help pharmaceutical and biotechnology companies reduce the time, cost and risk of drug development activities, and may improve the marketing and use
of pharmaceutical products. Our products and services are designed to help our customers use a more rigorous scientific and statistical process to identify earlier those drug candidates that will not
be successful and to enhance the likelihood that the remaining candidates will successfully complete clinical trials. This is significant because the process of taking a drug through clinical
development has remained lengthy and unpredictable while the productivity of discovery research has accelerated dramatically in recent years.

Eighteen
of the world's largest twenty pharmaceutical companies have begun to apply our computer-assisted drug development products and services, and our computer-based development
applications are currently used on more than 2,750 researcher desktops. To date, we have been engaged in over 200 clinical development projects in more than 15 therapeutic areas.

We
believe typical customer benefits of our capabilities include the following:



The
following illustrates a typical customer application of our products and services:



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We
were incorporated in California in April 1995, and we reincorporated in Delaware in June 2000. In August 2000, we completed the initial public offering and our
common stock began trading on the Nasdaq National Market. In November 2002, our common stock ceased to trade on the Nasdaq National Market. Our common stock is currently traded on the
Over-The-Counter Bulletin Board system. We file electronically with the Securities and Exchange Commission (or SEC) our annual reports on Form 10-K,
quarterly reports on Form 10-Q and current reports on Form 8-K pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934. The public may
read or copy any materials we file with the SEC at the SEC's Public Reference Room at 450 Fifth Street, NW, Washington, DC 20549. The public may obtain information on the operation of the Public
Reference Room by calling the SEC at 1-800-SEC-0330. The SEC maintains an Internet site that contains reports, proxy and information statements, and other
information statements, and other information regarding issuers that file electronically with the SEC. The address of that site ishttp://www.sec.gov.
Our website ishttp://www.pharsight.com. Our website address is given solely for informational purposes; we do not intend, by this reference, that our
website should be deemed to be part of this Annual Report on Form 10-K.

Pharsight Products and Services

We provide strategic services and computer-based development applications. We first offered our WinNonLin® and WinNonMix® (together
previously known as Model Workbench) and Trial Simulator (previously known as Trial Workbench) applications and scientific services in fiscal 1997. In fiscal 1998, we expanded our
consulting offering to include decision services. At the end of fiscal 2001, we combined our scientific, decision support, methodology and training groups into an integrated group renamed Strategic
Services. In fiscal 2002, we began selling our Pharsight® Knowledgebase Server (PKS), providing a means of capturing and managing both summary and detailed
pharmacokinetic/pharmacodynamic (PK/PD) data across a large set of compounds and development phases.

We
believe that a key part of future growth is to continue to deliver new products to our current and prospective customers. These new products need to address a broader set of customer
needs related to clinical development of drugs and thereby expand the number of prospective users we may sell to inside pharmaceutical companies. Our most recently announced product, PKS, was the
first step in providing a broader set of product functionality.

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In
a typical project, our products and services are used together to design clinical trials or development programs. Some customers purchase only services from us and other customers
purchase our computer-based development applications on a stand-alone basis as a tool for drug or disease modeling. In many cases our computer-based development applications continue to be utilized
upon completion of a project as our customers seek to further redesign their drug development processes. The following chart depicts typical issues that we are asked to address in projects.

|Phase I |  | Phase II/Phase III                                                             |  | Phase IV
|------- |  | ------------------------------------------------------------------------------ |  | --------
|       |  | Bridge preclinical results to clinical process.                                |  |        
|       |  | Explore dose ranging and population variability.                               |  |        
|       |  | Determine surrogate endpoint relevance, i.e. alternate indicators of efficacy. |  |        
|       |  | Support early "go/no-go" decisions.                                            |  |        
|       |  | Assess strategic fit in franchise.                                             |  |        
|        |  |                                                                                |  |        

Our
products and services provide an iterative method for enhancing the design of a clinical trial or development program, based on a series of steps. Each step utilizes available data
to produce and validate a mathematical model that is in turn used to select a better strategy for moving to the next stage of clinical development. In fiscal years 2003, 2002 and 2001, revenues from
our product offerings generated 44%, 35% and 30% of our revenues, respectively, and revenues from our strategic services generated 56%, 65% and 70% of our revenues, respectively.

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Strategic Services

Our strategic services consist of consulting, training and process redesign conducted by our clinical and decision scientists in the application and
implementation of our core decision methodology. The methodology employed by our services group uses four types of models that work in concert:

Drug-Disease Models

Our drug-disease models predictively characterize the distribution of treatment outcomes (safety, efficacy, surrogate outcomes) for a NCE (new chemical entity) and related compounds as a function of dosing strategy,
disease and patient and trial characteristics.Trial Models

Our trial models predict probability distributions of outcomes and reductions in uncertainty around them as a function of dosing strategy, number of treatment arms, type of control, sample population characteristics, sample size and treatment
duration.Market Models

Our market models characterize the demand for products (market size and share) under different feature sets and different competitive and innovation scenarios and their evolution over time.Financial Models

Our financial models incorporate the foregoing scientific, clinical and commercial insight to create a dynamic understanding of the value of a program at any point in time.


By
using these models in an integrated fashion, our consultants are able to place key decisions in development into quantitative terms of uncertainty and value. Drug development is a
process by which uncertainty about a drug's efficacy and safety is progressively reduced. Our methodology enables customers to identify which uncertainties are greatest and matter most, and then to
design development
programs, trial sequences, and individual trials in such a way that they systematically reduce those uncertaintiesand do so as rapidly and cost-effectively as possible.

The
methodology is most valuably applied very early in the life of a potential drug, but we have beneficially applied it at all stages of development. The integration of our models at
the asset strategy (overall positioning of a new drug) and program/trial strategy (focusing on a specific indicator) phases enables us to help our customers position their drugs as competitively as
possible in the market, to do so conducting all necessary and no unnecessary trials (and only as large, lengthy and costly as is required), and to redeploy resources away from unpromising compounds at
the earliest possible point.

As
of April 30, 2003, our strategic services group included 21 full-time personnel. Our personnel are located throughout the United States and Europe. Most have Ph.D.
degrees with post-doctoral training in clinical pharmacology, biostatistics, pharmacokinetics, mathematics, engineering, decision analysis or other relevant disciplines. We bring these
skill sets to bear in an integrated fashion to address our customers' challenges. Senior consultants have more than a decade of experience in drug-disease modeling, trial design or
strategic consulting. We also utilize a network of part-time consultants with expertise in various specialized disciplines and therapeutic areas.

We
are continually refining our methodologies and introducing new technologies. We are also expanding our activities at the portfolio level and in newer therapeutic areas. In addition,
we are beginning to address customer needs to improve their marketing and sales processes by applying the same quantitative methods that we apply to their development processes.

Computer-Based Development Applications and Services

Our software and services provide the analytical tools and conceptual framework to help clinical researchers optimize the decision-making required to perform
clinical testing needed to bring drugs to

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market.
By applying mathematical modeling and simulation to all available information on the compound being tested, researchers can clarify and quantify which trial and treatment design factors will
influence the success of clinical trials. Software applications are being designed to be increasingly deployed together with our strategic services.

Our
WinNonLin® and WinNonMix® software applications are used to build a drug model and validate the assumptions and information on which it is based. Our Trial
Simulator uses the models constructed and validated with these tools. Trial
Simulator provides a structured framework for clinical trial simulation based on mathematical models that integrate existing knowledge and assumptions about a drug and the targeted
population. Trial Simulator supports the use of simulation scenarios allowing the clinical researcher to perform "virtual clinical trials" on the computer.

Our
most recent product, the Pharsight® Knowledgebase Server (PKS), provides a means of capturing and managing both summary and detailed
pharmacokinetic/pharmacodynamic (PK/PD) data across a large set of compounds and development phases. PKS also provides a unified data environment for supporting clinical pharmacology modeling and
analysis activities. PKS is directly integrated with WinNonlin® Enterprise, which also provides import/export interfaces to other modeling and analysis tools. PKS was developed to help
enable compliance with the Federal Drug Administration (FDA) regulation 21 CFR 11, which requires electronic data security and auditing on submissions to the FDA. Linked to PKS, a separate
product, the PKS Reporter 1.0, will provide regulatory-compliant authoring of Microsoft® Word documents containing analysis results, source data, tables, and plots produced by
WinNonlin® or other tools and securely managed within the PKS.

We
believe that a key part of continued growth is to continue to deliver new products to our current and prospective customers. These new products need to address a broader set of
customer needs related to clinical development of drugs and thereby expand the number of prospective users we may sell to inside pharmaceutical companies. Our most recently announced product, PKS, was
the first step in providing a broader set of product functionality.

In
February 2001, we announced the signing of a Cooperative Research and Development Agreement (CRADA) with the FDA's Center for Drug Evaluation and Research (CDER) to collaborate
over the next three years on future versions of our WinNonLin®, WinNonMix® and Trial Simulator products.

Information Products

In November 2001, we decided to suspend all marketing and acquisition of data for our information products business. This business was intended to combine
anonymized patient level medical, laboratory and genetic data with software to access, analyze and present informative results to sophisticated queries. These information products permitted clinical
and scientific personnel to obtain objective and quantitative answers to important questions in trial and program decision-making concerning, for example, the correlation of various disease markers
with clinical outcomes, the frequency of adverse events under specific conditions, detailed patient demographics and response to placebo and standard therapies. There was very limited revenue
generated from our information products, and its discontinuance has not negatively impacted our financial results.

Sales and Marketing

Our customers range in size from the largest pharmaceutical companies to small biopharmaceutical companies, and the focus of our work differs somewhat depending
on the size and maturity of the customer. In our smaller and medium-sized customers, we tend to engage in discrete projects often with challenging analytic and design problems, where modeling and
simulation can be particularly valuable. This kind of work may or may not lead to subsequent engagements. By contrast, in our largest customers, we tend to have ongoing relationships progressively
focused on helping improve the

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process
by which they develop drugs, broadening and deepening the application of modeling and simulation over time, with the intent of achieving systematic, lasting performance improvement.

PKS
is our first enterprise-level software product, serving more than 100 users in our largest customers. Typically, the customer's purchase decision involves many groups, potentially
including clinical pharmacology, ADME (Absorption, Distribution, Metabolism and Excretion), toxicology, regulatory and early clinical as well as information technology (IT). It also involves a
significant validation process. PKS therefore requires a longer selling cycle than our previous software products, and demands a team of sales, marketing and support professionals in the sales
process.

Customers

Our customers currently consist of large pharmaceutical companies and biotechnology companies. During our fiscal year ended March 31, 2003, we provided
products and services for which we recognized revenue from more than 850 customers. Pfizer Inc., our largest customer, accounted for 18% of our revenue, and Eli Lilly accounted for 10% of our
revenue, in fiscal 2003. Consequently, we are dependent on Pfizer Inc. and Eli Lilly for a substantial portion of our revenues, and if we were to lose Pfizer Inc. or Eli Lilly as a
customer, it would have a material adverse effect on our revenues and business. We operate in only one business segment comprised of products and services to pharmaceutical and biotechnology companies
to improve the drug development process. Our revenues from external customers, profit and loss and total assets, are set forth in our financial statements, which appear in "Item
8Financial Statements and Supplementary Data." Information regarding sales to customers by major geographic regions is set forth in Note 12 to our financial statements, which
appear in "Item 8Financial Statements and Supplementary Data. No foreign country accounted for 10% or more of our total revenues in the years ended March 31, 2003, 2002, and 2001.
All of our significant long-lived assets are located within the United States.

Research and Development

We employ engineers with expertise in software development, web-based applications, database systems, and mathematical modeling, and scientists with
expertise in clinical development, statistical modeling, and clinical pharmacology and development. Our research and development personnel work closely with our service personnel in designing and
testing products to meet customer requirements.

As
of April 30, 2003, we had 14 employees engaged in research and development. Our research and development efforts are focused on improving and enhancing our existing products
and services as well as developing new products and services. Our research and development efforts take place principally at our offices in Mountain View, California, and Cary, North Carolina. Our
research and development expenses were $3.9 million, $6.6 million, and $8.1 million, in fiscal 2003, 2002, and 2001, respectively. In November 2002, we refocused our
research and development activities to concentrate only on our core modeling and simulation products (including PKS) and the development of our next generation platform. We believe research and
development expenses will decline in fiscal 2004 as compared to fiscal 2003, as the full year effect of last year's reduction of non-core resources are realized.

We
are investing to grow our business by expanding our ability to achieve potential breakthrough improvements in drug development productivity for our customers. The primary focus of
this investment is in software that enables customers to adopt and implement our model-based drug development methodology. New software is being designed to complement our existing modeling tools,
which are used by a relatively small number of technical experts, thereby enabling a much larger number of other participants in the drug development process to utilize those models in a systematic,
integrated fashion to collaborate and make better decisions. We are also broadening the capabilities of our services organization to help our customers take maximum advantage of the new tools.

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Intellectual Property Rights

Technology In-Licensing

Although our products are based on our research and development, we license software from third parties when it is more efficient to incorporate
pre-existing programs or routines, when
there are novel technologies available by license that would improve our products, or when brand-recognition of established products provides a marketing advantage. We incorporate such third-party
software that we have rights to use under the terms of license agreements that require us to pay royalties to the licensor based upon either a percentage of the sales of products containing the
licensed software or a fixed fee for each product shipped. Although all of the software we license for use in our products is replaceable with software from other vendors or our own development
efforts, the loss of a license could delay the sales of certain of our products.

Intellectual Property

Our success is dependent upon our ability to develop and protect our proprietary technology and intellectual property rights. We rely primarily on a combination
of contractual provisions, confidentiality procedures, trade secrets, and patent, copyright and trademark laws to accomplish these goals.

We
license our software products pursuant to non-exclusive license agreements, which impose restrictions on customers' ability to utilize the software. In addition, we seek
to avoid disclosure of our trade secrets, including but not limited to, requiring employees, customers and others with access to our proprietary information to execute confidentiality agreements with
us and restricting access to our source code. We also seek to protect our software, documentation and other written materials under trade secret and copyright laws.

We
have thirteen U.S. patent applications pending. It is possible that the patents that we have applied for, if issued, or our potential future patents may be successfully challenged or
that no patent will be issued from our patent application. It is also possible that we may not develop proprietary products or technologies that are patentable, that any patent issued to us may not
provide us with any competitive advantages, or that the patents of others will seriously harm our ability to do business.

Despite
our efforts to protect our proprietary rights, existing laws afford only limited protection. Attempts may be made to copy or reverse engineer aspects of our product or to obtain
and use information that we regard as proprietary. Accordingly, there can be no assurance that we will be able to protect our proprietary rights against unauthorized third party copying or use. Use by
others of our proprietary rights could materially harm our business. Furthermore, policing the unauthorized use of our product is difficult and expensive litigation may be necessary in the future to
enforce our intellectual property rights.

Government Regulation

The pharmaceutical industry is regulated by a number of federal, state, local and international governmental entities. Although the United States Food and Drug
Administration or comparable international agencies do not directly regulate our products and services, the use of certain of our
analytical software products by our customers may be regulated. We currently provide assistance to our customers in achieving compliance with these regulations.

Competition

We compete based on a number of factors, including cost, the quality and effectiveness of our services, and the functionality, reliability and ease of
implementation and use of our products. Our WinNonLin®, WinNonMix® and PKS products compete with products produced by InnaPhase Corporation. Although we believe we currently do
not have direct competitors for our Trial Simulator product line or our scientific services, other companies may compete with us in the future. Potential

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competitors
may have substantially greater financial, technical and marketing resources, larger customer bases, longer operating histories, greater name recognition and more established relationships
in the pharmaceutical industry than we have. In addition, competitors may merge or form strategic alliances and be able to offer, or bring to market earlier, services that are superior to our own. In
addition, our customers are primarily large pharmaceutical companies that have substantial research and development budgets, and these customers may internally develop the expertise that we provide.

Employees

As of April 30, 2003, we had a total of 72 employees. None of our employees is represented by a collective bargaining agreement, nor have we experienced
any work stoppage.

ITEM 2. PROPERTIES

Pharsight's principal administrative, sales, marketing and product development facilities are located in Mountain View, California. We lease approximately 10,000
square feet of space in Mountain View, California under a lease that expires in September 2005. Pharsight also leases a sales, development and training facility in Cary, North Carolina, under a
lease that expires in 2006. We believe that our existing facilities are adequate for our current needs and that additional space will be available as needed.

ITEM 3. LEGAL PROCEEDINGS

From time to time, Pharsight may become involved in claims, legal proceedings, or state or federal government agency proceedings that arise in the ordinary course
of its business. We are not currently a party to any material litigation and are currently not aware of any pending or threatened litigation that could have any material adverse effect upon our
business, operating results or financial condition.

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

No matters were submitted to a vote of Pharsight's stockholders during the fourth quarter of its fiscal year ended March 31, 2003.

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ADDITIONAL ITEMEXECUTIVE OFFICERS OF THE REGISTRANT

The following table provides information concerning our executive officers and key employees as of May 1, 2003:

Name

Age

PositionShawn M. O'Connor

43

President and Chief Executive OfficerCharles K. Faas

43

Vice President, Finance and Chief Financial OfficerMark R. Robillard

46

Senior Vice President, PKS Business UnitMona Cross Sowiski

53

Senior Vice President, Drug Development Consulting ServicesJacob Mandema

39

Senior Vice President and Chief Scientific OfficerE. Gregory Lee

54

Vice President, Engineering


Set
forth below is biographical information for each of our executive officers and key employees.

Shawn M. O'Connor, Pharsight's President, Chief Executive Officer and Director since February 2003, joined Pharsight in
September 2002 as its Senior Vice President and Chief Financial Officer. Mr. O'Connor has more than 20 years of experience in high technology executive management. Prior to
joining Pharsight, Mr. O'Connor was the President and Chief Operating Officer of QRS Corporation, a leading provider of business-to-business e-commerce
services to the retail industry, from 1995 to 2001. During his tenure, QRS established itself as the most comprehensive source for product information in the retail industry, established itself as a
key technology provider to industry sponsored internet exchanges such as the Worldwide Retail Exchange, and grew from 50 to 1100 employees and in excess of $160M in revenues. Mr. O'Connor's
responsibilities included strategic direction, business development, product development, product architecture, data center operations, customer service, investor relations, finance and accounting,
human resources and facilities. Prior to QRS, he served as Chief Financial Officer of Diasonics Ultrasound, Inc., a publicly held worldwide medical equipment manufacturer, from 1987 to 1994.
Mr. O'Connor began his career with the accounting firm Peat Marwick, where he served as a CPA in both San Francisco and London. Mr. O'Connor holds an A.B. from the University of
California, Berkeley, in Finance & Business Administration and is a graduate of the Executive Education Program at the Stanford Graduate School of Business.

Charles K. Faas, Pharsight's Chief Financial Officer since February 2003, joined Pharsight as Vice President of Finance in
July 2000 and was named Chief Accounting Officer and Treasurer in October 2001. From December 1999 to July 2000, Mr. Faas was Corporate Controller for ZLand.com, an
Internet business applications company. From July 1995 to December 1999, Mr. Faas was Controller for Cadence Design Systems' Methodology Services group, an electronic design
automation company. From 1982 to 1995, Mr. Faas was with IBM in both financial and accounting management roles. Mr. Faas was a founding board member of the San Jose
Inner-City Games and has served as either Chairman or Treasurer since its inception in 1996. He also served on the National Inner-City Games Foundation's honorary board. Since
1995, Mr. Faas has been an executive board member for the San Jose Sports Authority (the sports marketing arm for the City of San Jose). He holds a B.B.A. (Accounting) from Siena College.

Mark R. Robillardhas served as Vice President, Global Sales, since October 2001 and was named Senior Vice President, PKS Business
Unit in July 2002. From March 2000 to October 2001, Mr. Robillard was Vice President Business Development for SciQuest, Inc. From September 1999 to
March 2001, he held several positions, and most recently was Senior Vice President, Sales and Business Development, for EMAX Solutions, a company that provides chemical and compound management
and tracking systems for research and development organizations. In this role, he was responsible for driving EMAX's e-commerce solution strategy, business development activities and
global sales

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organization.
Prior to joining EMAX, Mr. Robillard spent 20 years at VWR Scientific Products, a $1.4 billion leading distributor of laboratory equipment, chemicals, and supplies
to the life sciences market. In his most recent position as Vice President, Electronic Commerce, Mr. Robillard launched VWR's first Internet sales channel, a
business-to-business online ordering facility for VWR's customers. He is credited with expanding monthly site traffic to over 100,000 users while increasing Web revenues 500%
each quarter for the last two years. During the time period, overall sales through all electronic channels doubled, accounting for 22% of VWR's revenues. Before his appointment in 1996 as Vice
President, Electronic Commerce, Mr. Robillard served in a number of key positions in sales and customer supply chain management, including area Vice President and District Manager.

Mona Cross Sowiski, joined Pharsight as Senior Vice President, Drug Development Consulting in July 2002. Ms. Sowiski has
more than twenty years executive and management consulting experience in the health care industry. Prior to joining Pharsight Ms. Sowiski was an independent health care and pharmaceutical
industry consultant from December 2001 to July 2002. From January 2002 to December 2002, Ms. Sowiski was a founding board member and served as President and Chief
Executive Officer of the Institute for Inclusive Work Environments, a non-profit research Institute focusing on workplace diversity and inclusive work policy research. From
March 1999 to November 2000 Ms. Sowiski was co-leader of the global health care consulting practice for Mitchell Madison consulting. From November 2000 to
December 2001, Ms. Sowiski engaged in independent consulting. From February 1992 to February 1999 she was Partner and Managing Director of the Western Division of the U.S.
for CSC/APM Healthcare. Prior to joining CSC/APM Healthcare, Ms. Sowiski held senior executive positions in leading academic medical institutions, including Stanford University Medical Center
and the University of Pittsburgh Health Sciences Center. Ms. Sowiski is a fellow of the National Foundation for Women's Resources. She served as a panel reviewer for the Department of Health
and Human Services Discretionary Funds Program in Washington, D.C. Ms. Sowiski serves on the boards of several non-profit organizations in Northern California. Ms. Sowiski
has a Bachelor of Arts from San Francisco State University and a Masters of Public Health from the Graduate School of Public Health, University of Pittsburgh.

Jacob Mandema, Ph.D., joined Pharsight in December 1996 as Vice President, Scientific Affairs and is currently Senior Vice
President and Chief Scientific Officer. Previous to joining Pharsight, Dr. Mandema was Director of New Products Discovery at ALZA Corporation, responsible for defining new product opportunities
for Alza's delivery technologies. Prior to that, he was Assistant Professor of Pharmaceutical Sciences at the Department of Anesthesia, Stanford University School of Medicine. At Stanford,
Dr. Mandema was directing research into the pharmacodynamic interactions among analgesic
and anesthetic drugs (partially funded by NIH). He received his Ph.D. from the division of pharmacology at the Center for Bio-Pharmaceutical Sciences, University of Leiden and his master's
degree from the school of Pharmacy, University of Utrecht, the Netherlands. Dr. Mandema's research interests are application of modeling and simulation to optimize treatment strategies, trial
designs, and drug development decision-making. He has published extensively and received several awards for his academic contributions, among which in 2000 the Tanabe Young Investigators Award from
the American College of Clinical Pharmacology. Dr. Mandema is a member of the American Statistical Association, the American Society for Clinical Pharmacology and Therapeutics and the American
Association of Pharmaceutical Scientists.

E. Gregory Lee, Ph.D., a Pharsight founder and its Vice President, Engineering, joined Pharsight in 1995. Dr. Lee has extensive
experience in the commercial development of mathematically and statistically oriented software programs. Prior to joining Pharsight, Dr. Lee was Director of Engineering at Sunrise Test Systems,
a leading developer of electronic design automation software. From 1984 until 1993, he held technical and management positions at Weitek Corporation. Prior to that, he held technical positions at
Applicon (Schlumberger) and Floating Point Systems. Dr. Lee received his Ph.D. in mathematics from MIT and his undergraduate degree from Reed College.

12

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PART II

ITEM 5. MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS

Our common stock is currently listed on the Over-The-Counter Bulletin Board system under the symbol "PHST.OB." Our common stock first
traded on August 9, 2000, concurrent with the underwritten initial public offering of shares of our common stock, on the Nasdaq National Market and continued to be traded there until
November 8, 2002. Prior to August 9, 2000, there was no established public trading market for our common stock.

As
of April 30, 2003, there were 19,053,057 shares of common stock outstanding that were held of record by approximately 128 stockholders.

We
have never declared or paid any cash dividends on our common stock and do not anticipate paying such cash dividends on our common stock in the foreseeable future. We currently
anticipate that we will retain all of our future earnings, if any, for use in the development and expansion of our business and for general corporate purposes. Any determination to pay dividends on
our common stock in the future will be at the discretion of our board of directors and will depend upon our results of operation, financial condition and other factors as our board of directors, in
its discretion, deems relevant. In addition, under the terms of some of our debt agreements, we are prohibited from paying dividends without the consent of the lender.

Set
forth below are the high and low bid prices per share of our common stock for each quarterly period in our fiscal years ended March 31, 2002 and 2003, as reported on the
Nasdaq National Market until November 8, 2002, and thereafter on the Over-The-Counter Bulletin Board system.

FY 2002

High

LowFirst Quarter (4/1/01-6/30/01)

$
3.75

$
1.80Second Quarter (7/1/01-9/30/01)

$
3.20

$
1.28Third Quarter (10/1/01-12/31/01)

$
2.00

$
0.75Fourth Quarter (1/1/02-3/31/02)

$
2.21

$
1.52FY 2003

High

LowFirst Quarter (4/1/02-6/30/02)


2.05


0.80Second Quarter (7/1/02-9/30/02)


1.15


0.50Third Quarter (10/1/02-12/31/02)


0.79


0.12Fourth Quarter (1/1/03-3/31/03)


0.30


0.07


The
over-the-counter quotations reflect inter-dealer prices, without retail mark-up, mark-down or commission and may not necessarily represent actual
transactions.

ITEM 6. SELECTED FINANCIAL DATA

You should read the following historical selected financial data in conjunction with the financial statements and related notes and "Management's Discussion and
Analysis of Financial Condition and Results of Operation" appearing elsewhere in this Annual Report on Form 10-K. We have derived our balance sheet data as of March 31, 2003
and 2002, and statements of operations data for each of the years ended March 31, 2003, 2002 and 2001, from our audited financial statements included in this Annual Report on
Form 10-K. We have derived our balance sheet data as of March 31, 2001, 2000 and 1999 and statements of operations data for the years ended March 31, 2000, and 1999,
from our

13

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audited
financial statements not included in this Annual Report on Form 10-K. Our historical results are not necessarily indicative of results to be expected for any future period.

|                                                                                              |                                              | Years Ended March 31, |        
|--------------------------------------------------------------------------------------------- | -------------------------------------------- | --------------------- | -------
|
|
|Statements of Operations Data                                                                 |                                              |                       |        
|Revenues                                                                                      |                                              | $                     | 13,968 
|Costs and expenses:                                                                           |                                              |                       |        
|Cost of revenues                                                                              |                                              |                       | 6,302  
|                                                                                              | Research and development                     |                       |        
|                                                                                              | Sales and marketing                          |                       |        
|                                                                                              | General and administrative                   |                       |        
|                                                                                              | Amortization of deferred stock compensation  |                       |        
|                                                                                              | Amortization of intangible assets            |                       |        
|                                                                                              | Restructuring                                |                       |        
|                                                                                              | Acquired in-process research and development |                       |        
|                                                                                              |                                              |                       |        
|Total operating expenses                                                                      |                                              |                       | 25,139 
|                                                                                              |                                              |                       |        
|Loss from operations                                                                          |                                              |                       | (11,171
|Other income (expense), net                                                                   |                                              |                       | (371   
|                                                                                              |                                              |                       |        
|Net loss                                                                                      |                                              |                       | (11,542
|Accretion on convertible preferred stock                                                      |                                              |                       |       
|Preferred stock dividend                                                                      |                                              |                       | (375   
|Deemed dividend to preferred stockholders                                                     |                                              |                       | (246   
|                                                                                              |                                              |                       |        
|Net loss applicable to common stockholders                                                    |                                              | $                     | (12,163
|                                                                                              |                                              |                       |        
|Basic and diluted net loss per share applicable to common stockholders                        |                                              | $                     | (0.65  
|                                                                                              |                                              |                       |        
|Shares used to compute basic and diluted net loss per share applicable to common stockholders |                                              |                       | 18,800 

|                                                  |  | March 31, |        
|------------------------------------------------- |  | --------- | -------
|
|
|Balance Sheet Data                                |  |           |        
|Cash, cash equivalents and short-term investments |  | $         | 10,875 
|Total assets                                      |  |           | 15,574 
|Long-term obligations, net of current portion     |  |           | 2,024  
|Redeemable convertible preferred stock            |  |           | 5,608  
|Deferred stock compensation                       |  |           | (352   
|Accumulated deficit                               |  |           | (77,721
|Total stockholders' equity (deficit)              |  | $         | (2,127 

14

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ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATION

The financial and business analysis below provides information that Pharsight believes is relevant to an assessment and understanding of Pharsight's financial
position and results of operations for the years ended March 31, 2003, 2002 and 2001. This financial and business analysis should be read in conjunction with "Item 6Selected
Financial Data" and our Financial Statements and related notes thereto set forth under "Item 8Financial Statements and Supplementary Data."

The
following discussion and certain other sections of this Annual Report on Form 10-K contain statements reflecting our views about our future performance and
constitute "forward-looking statements" under the Private Securities Litigation Reform Act of 1995. These forward-looking statements are generally identified by words such as "expect," "anticipate,"
"intend," "plan," "believe," "hope," "assume," "estimate" and other similar words and expressions. These views may involve risks and uncertainties that are difficult to predict and may cause actual
results to differ materially from the results discussed in such forward-looking statements. Readers should consider that various factors, including changes in general economic conditions, nature of
competition, relationships with key customers, industry consolidation, influence of e-commerce and other factors discussed in the "Business Risks" section below may effect our ability to
attain the projected performance. We undertake no obligation to update publicly any forward-looking statements, whether as a result of new information, future events or otherwise.

Overview

We develop and market integrated products and services that help pharmaceutical and biotechnology companies improve the drug development process. Our products and
services combine proprietary computer-based simulation, statistical and data analysis tools with the sciences of pharmacology, drug and disease modeling, human genetics and biostatistics.

Substantially
all of our sales activities are conducted through a dedicated direct sales organization located in the United States and Europe. In addition, our strategic services
consultants and technical support personnel conduct sales and marketing activities. Pfizer Inc. accounted for 18% of our revenue, and Eli Lilly accounted for 10% of our revenue, in fiscal 2003.
Consequently, we are dependent on Pfizer Inc. and Eli Lilly for a substantial portion of our revenues, and if we were to lose Pfizer Inc. or Eli Lilly as a customer, it would have a
material adverse effect on our revenues and business. In fiscal 2002, Pfizer Inc. was our largest revenue customer, accounting for 20%.

Critical Accounting Policies and Estimates

Our financial statements are based on the selection and application of significant accounting policies, which require management to make significant estimates and
assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent liabilities. On an on-going basis, we evaluate estimates,
including those related to revenue and restructuring. Estimates are based on historical experience and on various other assumptions that management believes to be reasonable under the circumstances.
These estimates form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ materially from
these estimates under different assumptions or conditions. We believe that the following are some of the more critical judgment areas in the application of our accounting policies that currently
affect our financial condition and results of operations.

15

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Revenue Recognition

Revenue results are difficult to predict, and any shortfall in revenue or delay in recognizing revenue could cause our operating results to vary significantly
from quarter to quarter. We follow detailed revenue recognition guidelines, which are discussed below. We recognize revenue in accordance with GAAP rules that have been prescribed for the software
industry. The accounting rules related to revenue recognition are complex and are affected by interpretations of the rules and an understanding of industry practices, both of which are subject to
change. Consequently, the revenue recognition accounting rules require management to make significant judgments.

We
do not record revenue on sales to customers whose ability to pay is in doubt at the time of sale. Rather, we recognize revenue from these customers as cash is collected. The
determination of a customer's ability to pay requires significant judgment. In this regard, management considers the international region of the customer and the financial viability of the customer in
assessing a customer's ability to pay.

We
generally do not consider revenue arrangements with extended payment terms to be fixed or determinable and, accordingly, we do not generally recognize revenue on the majority of these
arrangements until the customer payment becomes due. The determination of whether extended payment terms are fixed or determinable requires management to exercise significant judgment, including
assessing such factors as the past payment history with the individual customer and evaluating the risk of concessions over an extended payment period. The determinations that we make can materially
impact the timing of recognition of revenues. Our normal payment terms currently range from "net 30 days" to "net 60 days," which are not considered extended payment terms.

Some
of our PKS software arrangements include consulting implementation services. We defer revenue for consulting implementation services, along with the associated license revenue,
until the services are completed. If there is a significant uncertainty about the project completion or receipt of payment for the consulting services, we defer revenue until the uncertainty is
sufficiently resolved.

Restructuring

During fiscal years 2003 and 2002, we recorded significant accruals in connection with our restructuring programs. These accruals include estimates pertaining to
the ability to sub-lease a facility in Mountain View, California. The actual costs may differ from these estimates. These estimates will be reviewed and potentially revised on a quarterly
basis and, to the extent that future vacancy rates and sublease rates vary adversely from those estimates, we may incur additional losses that are not included in the accrued facilities consolidation
charge at March 31, 2003. Conversely, unanticipated improvements in vacancy rates or sublease rates, or termination settlements for less than our accrued amounts, may result in a reversal of a
portion of the accrued balance and a benefit on our statement of operations in a future period. Such reversals would be reflected as a credit to restructuring charges.

Source of Revenue and Revenue Recognition

Our revenues are derived from two primary sources: initial and renewal fees for product licenses and scientific and training consulting services. Additionally, we
had an insignificant amount of revenue from subscriptions to our information products in fiscal 2003.

Our
revenue recognition policy is in accordance with Statement of Position No. 97-2, "Software Revenue Recognition," or SOP 97-2, as amended by Statement
of Position No. 98-4, "Deferral of the Effective Date of SOP 97-2, `Software Revenue Recognition,' " or SOP 98-4, and Statement of Position
No. 98-9, "Modification of SOP No. 97-2 with Respect to Certain Transactions," or SOP 98-9. For each arrangement, we determine whether evidence of an
arrangement exists, delivery has occurred, the fee is fixed or determinable, and collection is probable. If any of these criteria are not met, we defer revenue

16

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recognition
until such time as all of the criteria are met. We do not currently offer, have not offered in the past, and do not expect to offer in the future, extended payment term arrangements. If we
do not consider collectibility to be probable, we recognize revenue when the fee is collected. No customer has the right of return.

We
have contracts from which we receive solely license and renewal fees consist of one-year software licenses (initial and renewal fees) bundled with post contract support
services, or PCS. We do not have vendor specific objective evidence to allocate the fee to the separate elements, as we do not sell PCS separately. We recognize each of the initial and renewal license
fees ratably over the one-year period of the license during which the PCS is expected to be provided as required by paragraph 12 of SOP 97-2.

We
do not present PCS revenue separately as we do not have vendor specific objective evidence of PCS, and we do not believe other allocation methodologies, namely allocation based on
relative costs, provide a meaningful and supportable allocation between license and PCS revenues.

For
arrangements consisting solely of services, we recognize revenue as services are performed. Arrangements for services may be charged at daily rates for different levels of
consultants and out-of-pocket expenses or may be for a fixed fee. For fixed fee contracts with payments based on milestones or acceptance criteria, we recognize revenue as such
milestones are achieved or upon acceptance, which approximates the level of services provided. For fixed fee arrangements at the end of each accounting period (i) we analyze the appropriateness
of the daily rates charged based upon total fees to be charged and total hours to be incurred, and (ii) we determine if losses should be recognized.

We
also enter into arrangements consisting of licenses, renewal fees and scientific consulting services. The scientific consulting services meet the criteria of paragraph 65 of
SOP 97-2 for separate accounting. As the only undelivered elements are services and PCS, and the PCS term (expressed or implied) and the period over which we expect the services to be
performed are the same period, we recognize revenue based on the lesser of actual services performed and licenses delivered or straight line over the period of the agreement. If the PCS term and the
period over which we expect the services to be performed are not the same period, we recognize revenue based on the lesser of actual services performed and licenses delivered or straight line over the
longer of the PCS term and
the period over which we expect the services to be performed. Vendor specific objective evidence of fair value of scientific services for purposes of revenue recognition in these multiple element
arrangements is based on daily rates for different levels of consultants and out-of-pocket expenses.

We
also have arrangements that consist of licenses, PCS, and implementation/installation services. For arrangements involving a significant amount of services related to installation and
implementation of our software products, we recognize revenue for the entire arrangement fee ratably over the remaining period of the PCS term once the services are completed and accepted by the
customer. We currently do not have vendor specific objective evidence for our PCS.

We
recognize revenue from the subscription to information products over the contract period, provided we have evidence of an arrangement, the price of the subscription is fixed or
determinable and payment is reasonably assured. The subscription fees have been included in license revenues.

We
have one international distributor. There is no right of return or price protection for sales to the international distributor. Sales are made to the distributor using a
sell-in model. Revenue from this distributor in fiscal 2003 was less than 2%. Revenues from this distributor for fiscal 2002 and 2001 were less than 1% of total revenues.

Acquisitions

In February 2001, we acquired the assets of Metazoa.com, a privately-held company that develops collaborative software for the life science
research community. We purchased Metazoa.com's assets for

17

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cash
of $250,000 and incurred acquisition expenses of $102,000. The acquisition was accounted for using the purchase method. We allocated the purchase price to intangible assets and goodwill based on
a valuation.

Deferred Stock Compensation

During the years ended March 31, 2001 and 2000, we recorded aggregate deferred compensation of $10.1 million and $5.4 million, respectively,
representing the difference between the exercise price of stock options granted and the then deemed fair value of our common stock. The amortization of deferred compensation is charged to operations
over the vesting period of the options using the graded
method for employee options, and the straight-line method for non-employee options. During the year ended March 31, 2002, we recorded deferred stock compensation of
$114,000 representing the intrinsic value of a certain stock award issued to an officer as a bonus. We amortized $1.3 million, $3.0 million and $7.6 million of deferred
compensation for the years ended March 31, 2003, 2002, and 2001. The amount of deferred compensation relating to stock options issued to employees and consultants to be amortized in future
periods, ending March 31, is as follows:

2004

$
320,0002005

$
32,000


The
amount of deferred compensation expense to be recorded in future periods may further decrease if unvested options for which deferred compensation has been recorded are subsequently canceled.

Results of Operations

All percentage calculations set forth in this section have been made using figures directly from the financial statements, and not from the rounded figures
referred to in the text of this management discussion and analysis.

Years Ended March 31, 2003 and 2002

Revenues.License and renewal revenues increased $1.1 million, or 24%, from $5.0 million in fiscal 2002 to
$6.1 million in fiscal 2003. Of this increase, approximately $350,000 was due to new license sales and $800,000 due to an increase in annual renewal revenue, attributed to the growth in the
installed base. Included in this renewal increase is over $400,000 of PKS license renewals.

Service
revenues decreased $1.5 million, or 16%, from $9.3 million in fiscal 2002 to $7.8 million in fiscal 2003, primarily driven by the slowdown of services
rendered under consulting agreements as some key pharmaceutical customers reduced their spending budgets in fiscal 2003. This downward trend was most pronounced during the first half of the year,
while the beginnings of a reversal was noticeable in the third and fourth quarter of fiscal 2003, as evidenced by the signing of significant agreements with customers such as Pfizer, Roche, and
several Japanese companies.

The
effect of budget cutbacks was partially offset by significant engagement expansions with some of our existing customers such as Aventis and Cephalon, and renewal of engagements with
Eli Lilly and the major pharmaceutical research and development locations of Pfizer, Inc. In addition, approximately $700,000 in revenue was generated from new services customers, as efforts to
diversify our revenue base began to produce results, measured by a 30% increase in the total number of revenue-generating services customers in fiscal 2003 compared to fiscal 2002. We view customers'
continued adoption of our methodologies as validation of our business. As of March 31, 2003, we continued to be engaged with 14 of the top 20 major pharmaceutical companies.

Costs and expenses.The amounts discussed below for costs of license and renewal, cost of services, research and development,
sales and marketing, and general and administrative expenses, are

18

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excluding
amortization of deferred stock-based compensation. Amortization of deferred stock-based compensation is discussed above under "Deferred Stock Compensation".

Cost of revenues.Cost of license and renewal revenues consists of royalty expense for third-party software included in our
products, and cost of materials for both initial products and product updates provided for in our annual license agreements. Cost of license and renewal revenues decreased 69% to $629,000 for the year
ended March 31, 2003, from $2.0 million for the year ended March 31, 2002. The decrease was driven by the cost of revenues related to our information products which we ceased
selling in July 2001. The restructuring actions in fiscal 2002 reduced resources in non-core areas such as our information products. Cost of license and renewal revenues as a
percentage of license and renewal revenues was 10% for the year ended March 31, 2003, compared to 40% for fiscal 2002. We expect this percentage in fiscal 2004 to be consistent with fiscal
2003, as product royalties continue and all information product costs, as of November 2001, are now expensed.

Cost
of services revenues decreased 9% to $5.7 million for the year ended March 31, 2003, from $6.3 million for the year ended March 31, 2002. The decrease
was due primarily to fewer personnel in strategic services. Because of the direct relationship of personnel to projects undertaken, we anticipate that as we take on new projects, cost of revenues
generally will reflect changes in total revenue. The cost of service revenues, as a percentage of service revenues, was 73% in fiscal 2003 and 68% in fiscal 2002. The increase in this percentage in
fiscal 2003 was due to under utilized capacity in our services organization for the first half of fiscal year 2003. We saw improved billable utilization in the second half of fiscal 2003. In fiscal
2004, we are more closely aligning project teams with key customer accounts. This is being implemented to make improvements to our productivity, margins and revenues
on an annual basis. We do not expect to see significant benefits until the second half of fiscal 2004, at the earliest.

Research and development.Research and development expenses decreased $2.7 million, or 40%, from $6.6 million
in fiscal 2002 to $3.9 million in fiscal 2003. The decrease resulted primarily from reduced numbers of software developers and outside contractors in non-core product areas,
including management and non-revenue-generating products areas. As a percentage of total revenues, research and development expenses decreased from 46% in fiscal 2002 to 28% in fiscal
2003. We believe research and development expenses will decline in fiscal 2004 as compared to fiscal 2003, as we see the full year impact of the headcount reductions we implemented in fiscal 2003.

Sales and marketing.Sales and marketing expenses decreased $1.9 million, or 22%, from $8.6 million in fiscal
2002 to $6.7 million in fiscal 2003. The decrease in sales and marketing expenses is related primarily to a reduction in the number of our sales and marketing force personnel. As a percentage
of total revenues, sales and marketing expenses decreased from 61% in fiscal 2002 to 48% in fiscal 2003. The decrease in marketing and sales expense as a percentage of total revenues reflects the
reduction in the number of professionals selling and marketing our products and services. We expect that our sales and marketing expenses will decline in fiscal 2004 as compared to fiscal 2003, as we
see the full year impact of the headcount reductions we implemented in fiscal 2003.

General and administrative.General and administrative expenses increased from $5.9 million in fiscal 2002 to
$6.3 million in fiscal 2003. The increase is related to severance costs resulting from changes in management staff, as well as escalating insurance and professional service fees partially
offset by a reduction in the number of general and administrative personnel. As a percentage of total revenues, general and administrative expenses increased from 41% in fiscal 2002 to 45% in fiscal
2003. We expect that our general and administrative expenses will decline in fiscal 2004 as compared to fiscal 2003, as we see the full year impact of the headcount reductions we implemented in fiscal
2003.

Restructuring.In fiscal 2003 and 2002, we implemented restructuring programs to better align operating expenses with
anticipated revenues. During the third quarter of fiscal 2002, we recorded a

19

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$676,000
restructuring charge, which consisted of $402,000 in facility exit costs, $253,000 in employee severance costs and $21,000 in other exit costs. The restructuring program resulted in a
reduction in force across all company functions of approximately 14% of our work force, or 20 employees and was intended to reduce expenses by approximately $4.5 million on an annualized basis.

During
the second quarter of fiscal 2003, we recorded a $324,000 restructuring charge, which consisted entirely of employee severance costs. The restructuring program resulted in a
reduction in force across all company functions of 18 employees or approximately 15% and is intended to result in a reduction in annualized operating expenses of $2.5 to $3.0 million.

During
the third quarter of fiscal 2003, we recorded a $364,000 restructuring charge, which consisted of $293,000 in employee severance costs and $71,000 in facility exit costs. The
restructuring plan reduced resources not integral to the development, marketing and deployment of our software products and consulting services. This includes a reduction in staff of 19 employees or
approximately 20% of our work force, and is intended to result in a reduction in annualized operating expenses of $2.0 to $2.5 million, helping the company move closer to its goal of
long-term, sustainable profitability.

We
expect these three restructuring programs will save us a total of approximately $10 million per year of cash. There is approximately $84,000 of remaining cash payments to be
made in the first two quarters of fiscal 2004 from these charges.

Other income (expense), net.Other expense, net, was $371,000 for fiscal 2003 as compared to other income, net, of $212,000
for fiscal 2002. This occurred as a result of lower interest income on a smaller average balance of cash and short-term investments, as well as higher interest expense as we began paying
for our utilization of our term loan. We continued to reduce the outstanding balance of our obligations under capital leases.

Provision for income taxes.As a result of our net operating losses, no provision was recorded for income taxes during fiscal
years 2003 and 2002. As of March 31, 2003, we had federal and state net operating losses of $58 million and $19 million respectively, which begin to expire in the years 2005
through 2023, if not utilized. We have recorded a valuation allowance against the entire net operating loss carry-forwards because of the uncertainty that we will be able to realize the benefit of the
net operating loss carry-forwards before they expire.

Years Ended March 31, 2002 and 2001

Revenues.License and renewal revenues increased $1.4 million, or 38%, from $3.6 million in fiscal 2001 to
$5.0 million in fiscal 2002. Of this increase, $1.1 million was due to an approximately 26% increase in the number of licenses sold from fiscal 2001 to fiscal 2002, and approximately
$253,000 reflected an increase in annual renewal revenue due to the growth in the installed base.

Service
revenues increased $1.0 million, or 12%, from $8.3 million in fiscal 2001 to $9.3 million in fiscal 2002. Significant customer renewals and additions in
fiscal 2002 included Aventis, Eli Lilly and expansion to all R&D locations of Pfizer, Inc., as well as Millennium Pharmaceuticals. As a result of these expansions, revenue from existing
customers increased $3.0 million or 34%, from $8.7 million in
fiscal 2001 to $11.7 million in fiscal 2002. Over the same period, revenue from new customers declined 18%, as we focused on enhancing our existing relationships.

Cost of revenues.Cost of license and renewal revenues increased 25% to $2.0 million for the year ended
March 31, 2002, from $1.6 million for the year ended March 31, 2001. The increase was due primarily to the inclusion of costs of our information products as cost of revenues
beginning with the release of these products for general distribution in December 2000. During the year ended March 31, 2002, we implemented a restructuring program to better align
operating expenses with anticipated revenues. The restructuring actions reduced resources in non-core areas such as our information

20

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products.
Cost of license and renewal revenues as a percentage of license and renewal revenues was 40% for the year ended March 31, 2002, compared to 45% for fiscal 2001.

Cost
of services revenues increased 26% to $6.3 million for the year ended March 31, 2002, from $5.0 million for the year ended March 31, 2001. The increase
was due primarily to additional personnel in strategic services. The cost of service revenues, as a percentage of service revenues, was 68% in fiscal 2002 and 60% in fiscal 2001. The increase in this
percentage in fiscal 2002 was due to under utilized capacity in our services organization.

Research and development.Research and development expenses decreased $1.5 million, or 19%, from $8.1 million
in fiscal 2001 to $6.6 million in fiscal 2002. The decrease resulted primarily from reduced numbers of software developers and outside contractors in non-core product areas
including our information products areas. As a percentage of revenues, research and development expenses decreased from 68% in fiscal 2001 to 46% in fiscal 2002.

Sales and marketing.Sales and marketing expenses increased $1.9 million, or 29%, from $6.7 million in fiscal
2001 to $8.6 million in fiscal 2002. The increase in sales and marketing expenses is related primarily to an expansion in our sales force personnel during fiscal 2002. As a percentage of total
revenues, sales and marketing expenses increased from 56% in fiscal 2001 to 61% in fiscal 2002. The increase in marketing and sales expense as a percentage of total revenues reflects the growth in the
number of professionals selling and marketing our products and services during fiscal 2002, offset in part by increased revenues.

General and administrative.General and administrative expenses increased from $4.0 million in fiscal 2001 to
$5.9 million in fiscal 2002. The increase is related to growth in management and administrative support staff during fiscal 2002 as well as professional fees as a result of the expansion of our
business and the costs of being a public company. As a percentage of total revenues, general and administrative expenses increased from 34% in fiscal 2001 to 41% in fiscal 2002.

Restructuring.In fiscal 2002, we implemented a restructuring program to better align operating expenses with anticipated
revenues. Our restructuring actions reduced resources in non-core areas. We recorded a $676,000 restructuring charge, which consists of $402,000 in facility exit costs (including $81,000
in equipment impairment), $253,000 in personnel severance costs and $21,000 in other exit costs. The restructuring program resulted in the reduction in force across all company functions of
approximately 14% or 20 employees. As of March 31, 2002, all 20 employees had been terminated as a result of the program. The restructuring actions did not impact the resources assigned to
develop or support our current and future PKS, WinNonlin®, WinNonMix® and Trial Simulator product families. At March 31, 2002, we had $249,000 of accrued
restructuring costs related to monthly lease expenses for two facilities that were exited in fiscal 2002, employee severance payments and other exit costs.

Other income (expense), net.Other income, net, decreased to $212,000 for fiscal 2002 from other income, net, of
$1.0 million for fiscal 2001. This decrease occurred as a result of lower interest income on a smaller average balance of cash and short-term investments, as well as higher interest
expense as we began paying for our utilization of our term loan. We continued to reduce the outstanding balance of our obligations under capital leases.

Provision for income taxes.As a result of our net operating losses, no provision was recorded for income taxes during fiscal
years 2002 and 2001.

21

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Liquidity and Capital Resources

From our inception through the initial public offering of our common stock, we funded operations through the private sale of preferred stock, with net proceeds of
approximately $38 million, limited borrowings and equipment leases. In August 2000, we completed our initial public offering of 3,000,000 shares of common stock, at a price of $10.00 per
share, all of which shares were issued and sold by us for net proceeds of $26.4 million, net of underwriting discounts and commissions of $2.1 million and expenses of
$1.5 million. We paid $6.1 million to holders of our Series C preferred stock at the closing of the offering as required by the terms of the Series C preferred stock. After
this payment, our net proceeds were $20.3 million. In June and September of last year, we completed a private placement of preferred stock to several of our investors, raising additional net
proceeds of $7.2 million, as further described below.

As
of March 31, 2003, we had $10.9 million in cash and short-term investments, which include $3.8 million of cash borrowed under our credit facilities
with Silicon Valley Bank. Cash and short-term investments decreased by $2.6 million from those held as of March 31, 2002. In June 2001, we extended and enhanced our
previously unused credit facilities with Silicon Valley Bank, providing up to $7.5 million available under three different facilities. All have rates which are based on the prime interest rate
plus one point or prime interest plus 1.25 points. The term loan facility of $3.5 million was fully exercised in fiscal 2002 and is payable, beginning in July 2002, over the next four
years, ending June 2006.

As
of March 31, 2003, we had $2.8 million remaining to be paid on our term loan facility, having paid $656,000 to Silicon Valley Bank. We also continued to have
$1.0 million of our accounts receivable facilities utilized. During 2003, the following financial covenants applied to our Silicon Valley Bank loan facilities: quick ratio greater than 1.0;
remaining months liquidity of at least six months (defined as cash used in operating activities for the most recent quarter multiplied by two); liquidity of at least two times the term loan advance;
and annual net losses within 20% of our plan, measured at specific quarterly intervals. On October 23, 2002, we obtained a modification to our Silicon Valley Bank loan agreement. This
modification revised our allowable net losses for the second half of fiscal 2003. As of March 31, 2003, we were in compliance with all the covenants under our credit facilities with Silicon
Valley Bank.

In
May 2003, we extended our secured revolving credit facility agreement with Silicon Valley Bank for an additional year. We have up to $2.0 million available under two
accounts receivable facilities. These include $1.4 million of secured revolving credit against 80% of eligible domestic accounts receivable and
$600,000 of secured revolving credit against 90% of eligible foreign accounts receivable. We continue to have $1.0 million of the accounts receivable facilities utilized.

The
following financial covenants apply to the extended Silicon Valley Bank loan facilities: remaining months liquidity of at least six months (defined as cash used in operating
activities for the most recent quarter multiplied by two); liquidity of at least two times the term loan advance; and cumulative fiscal year-to-date net loss within 20% of our
plan, measured monthly.

Net
cash used in operating activities was $8.3 million in fiscal 2003, $10.4 million in fiscal 2002 and $11.6 million in fiscal 2001. The cash used in these periods
was primarily attributable to net losses in each period of $11.5 million, $19.0 million and $20.6 million, respectively, partially offset by non-cash charges for
depreciation and amortization, and amortization of deferred stock compensation. Strong collections during the last fiscal quarter of 2003 yielded improved net cash used in operating activities.

Net
cash provided by investing activities was $2.9 million in fiscal 2003, primarily due to the maturities of short-term investments, offset slightly by $216,000 of
purchases of equipment. Net cash provided by investing activities was $1.5 million in fiscal 2002, which resulted from maturities of short-term investments, partially offset by
purchases of short-term investments and purchases of

22

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$1.4 million
of property and equipment. Net cash provided by investing activities was $2.1 million in fiscal 2001, primarily due to $2.6 million of capital expenditures, offset in
part by the net maturities of short-term investments exceeding purchases. We also had $150,000 released from restricted cash, when we renegotiated our Mountain View, California facility
lease.

Financing
activities provided net cash of $5.7 million in fiscal 2003, $4.1 million in fiscal 2002 and $19.5 million in fiscal 2001. In fiscal 2003, these amounts
were primarily from cash provided as a result of proceeds from the issuance of Series A redeemable convertible preferred stock and warrants, resulting in net proceeds of approximately
$7.2 million. We borrowed, then re-paid, $750,000 on our accounts receivable facilities in the first fiscal quarter of 2003. Additionally, we made principal payments on capital
leases of $660,000 and paid the first nine of 48 installments on our term loan with Silicon Valley Bank totaling $656,000.

The
following table depicts our contractual obligations as of March 31, 2003:

|                                       |  | Payments Due by Period
|-------------------------------------- |  | ----------------------
|
|
|Redeemable convertible preferred stock |  | $                     
|Notes Payable                          |  |                       
|Capital Lease Obligations              |  |                       
|Operating Leases (Gross)*              |  |                       
|                                       |  |                       
|Total Contractual Cash Obligations     |  | $                     
|                                       |  |                       

---

Management
believes we have adequate cash to sustain operations through fiscal year 2004 and is managing the business to achieve positive cash flow utilizing existing assets. During
2003, our commitments and liabilities were significantly reduced via restructuring events. In addition, we reduced ongoing operating expenses by reducing purchases of other services and making
workforce reductions. We are committed to the successful execution of our operating plan and will take further restructuring actions as necessary to ensure our cash resources are sufficient to fund
our presently anticipated operating losses and working capital requirements at least through fiscal 2004.

Related Party Transaction

On June 26, 2002 and September 11, 2002, we completed private placements of our securities to certain entities affiliated with Alloy
Ventures, Inc. and the Sprout Group, both of which were among our existing stockholders, pursuant to a Preferred Stock and Warrant Purchase Agreement (the "Purchase Agreement"). Pursuant to the
Purchase Agreement, we sold an aggregate of 1,814,662 units (each a "Unit," and collectively the "Units"). Each Unit consisted of one share of our Series A redeemable convertible preferred
stock (the "Series A Preferred") and a warrant to purchase one share of our common stock. The purchase price for each Unit was $4.133, which is the sum of $4.008 (four times the underlying
average closing price for our common stock over the five trading days prior to the initial closing (i.e., $1.002)) and $0.125 for each share of Series A Preferred and warrant, respectively. The
Second Closing, which occurred on September 11, 2002, was subject to stockholder approval, which was obtained on September 6, 2002.

The
Series A Preferred is redeemable at any time after five years from the date of issuance upon the affirmative vote of at least 75% of the holders of Series A Preferred,
at a price of $4.008 per share plus any unpaid. Each share of Series A Preferred is convertible into four shares of our common stock

23

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at
the election of the holder or upon the occurrence of certain other events. The holders of Series A Preferred are entitled to receive, but only out of legally available funds, quarterly
cumulative dividends at the rate of 8% per year commencing in September 2002, which are payable in cash or shares of Series B redeemable convertible preferred stock (the "Series B
Preferred" and, together with the Series A Preferred, the "Preferred Stock"), at the election of the holder. The terms of the Series B Preferred are identical to the Series A
Preferred, except that the Series B Preferred is not entitled to receive the 8% dividends. In the event of any liquidation or winding up of the company, the holders of the Series A
Preferred and Series B Preferred shall be entitled to receive in preference to the holders of the common stock a per share amount equal to the greater of (a) the original issue price,
plus any accrued but unpaid dividends and (b) the amount that such shares would receive if converted to common stock immediately prior thereto (the "Liquidation Preference"). After the payment
of the Liquidation Preference to the holders of Preferred Stock, the remaining assets shall be distributed ratably to the holders of the common stock. A merger, acquisition, sale of voting control of
the company in which our stockholders do not own a majority of the outstanding shares of the surviving corporation, or a sale of all or substantially all of our assets, shall be deemed to be a
liquidation.

The
holders of Series A Preferred and Series B Preferred are entitled to vote together with the common stock. Each share of Preferred Stock shall have a number of votes
equal to the number of shares of common stock then issuable upon conversion of such share of Preferred Stock. In addition, consent of the holders of at least 75% of the then outstanding Preferred
Stock shall be required for certain actions, including any action that amends our charter documents so as to adversely affect the Preferred Stock.

The
warrants are exercisable for a period of five years from issuance with an exercise price of $1.15 per share.

Pursuant
to the Purchase Agreement, we filed a registration statement on Form S-3 (File No. 333-98095) for the resale of the shares of Common Stock
issuable to the investors upon conversion of the shares of Preferred Stock and exercise of the warrants. The registration statement became effective on October 31, 2002. In the event that we
fail to keep the Registration Statement effective (other than pursuant to the permissible suspension periods or waivers granted by the holders of the Preferred Stock), we are obligated to pay to the
holders of Preferred Stock as liquidated damages, the amount of 1% per month of the aggregate purchase price for the shares remaining to be sold pursuant to the registration statement.

Impact of Inflation

The effect of inflation and changing prices on our operations was not significant during the periods presented.

Recent Accounting Pronouncements

Accounting for Costs Associated with Exit and Disposal Activities

In July 2002, the FASB issued Statement of Financial Accounting Standards No. 146 ("FAS 146"),Accounting for Costs
Associated with Exit and Disposal Activities. This statement revises the accounting for exit and disposal activities under Emerging Issues Task Force Issue 94-3
("EIFT 94-3"),Liability Recognition for Certain Employee Termination Benefits and Other Costs to Exit an Activity, by spreading out the
reporting of expenses related to restructuring activities. Commitment to a plan to exit an activity or dispose of long-lived assets will no longer be sufficient to record a
one-time charge for most anticipated costs. Instead, companies will record exit or disposal costs when they are "incurred" and can be measured at fair value, and they will subsequently
adjust the recorded liability for changes in estimated cash flows. The provisions of SFAS No. 146 are effective prospectively for exit or disposal activities initiated after December 31,
2002. Companies may not restate previously issued financial

24

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statements
for the effect of the provisions of SFAS No. 146. In addition, liabilities that a company previously recorded under EITF Issue No. 94-3 are grandfathered. The
restructuring activities initiated by us in November 2001, July 2002 and November 2002 have been accounted for under the provisions of EITF 94-3. We plan to adopt
SFAS 146 on January 1, 2003. The adoption of SFAS No. 146 did not have a material impact on the financial position or results of operations.

Accounting for Stock-Based Compensation-Transition and Disclosure

In December 2002, the FASB issued Statement of Financial Accounting Standards No. 148, "Accounting for Stock-Based
CompensationTransition and Disclosure" ("Statement 148"). Statement 148 amends Statement of Financial Accounting Standards No. 123, "Accounting for Stock-Based
Compensation," ("Statement 123") and provides alternative methods of transition for a voluntary change to the fair value based method of accounting for stock-based employee compensation.
Statement 148 also amends the disclosure requirements of Statement 123 to require more prominent and frequent disclosures in financial statements about the effects of stock-based
compensation. The transition guidance and annual disclosure provisions of Statement148 are effective for financial statements issued for fiscal years ending after December 15, 2002 and for
interim periods beginning after December 15, 2002. Accordingly, we adopted the disclosure provisions of this statement in our financial statements of fiscal year 2003.

Guarantor's Accounting Disclosure Requirements for Guarantees, Including Indirect Guarantees of Indebtedness of Others

In December 2002, the FASB issued Interpretation No. 45, "Guarantor's Accounting and Disclosure Requirements for Guarantees, Including Indirect
Guarantees of Indebtedness of Others ("FIN 45")."
FIN 45 elaborates on the disclosures to be made by a guarantor in its interim and annual financial statements about its obligations under certain guarantees that it has issued. It also clarifies that
a guarantor is required to recognize, at the inception of a guarantee, a liability for the fair value of the obligation undertaken in issuing the guarantee. We adopted the disclosure requirements of
FIN 45 as of December 31, 2002. In addition, we are required to adopt the initial recognition and measurement of the fair value of the obligation undertaken in issuing the guarantee on a
prospective basis to guarantees issued or modified after December 31, 2002. We do not believe FIN 45 will have a material effect on our operations, financial position or cash flows.

Business Risks

Items That Affect Our Future Operations

We have a history of losses that we expect will continue, and we may not be able to generate sufficient revenues to achieve profitability.

We commenced our operations in April 1995 and have incurred net losses since that time. As of March 31, 2003, we had an accumulated deficit of
$77.7 million. We expect to incur further losses as we continue to develop our business. Since the amounts we may determine to invest to grow our business are uncertain, we are unable to be
certain when, if ever, we may become profitable. We have announced that we intend to achieve cash breakeven; however, this expectation is based on a number of assumptions, including some outside of
our control, including the state of the overall economy and the demand for our products, and if these assumptions do not prove to be accurate then we may never generate sufficient revenues to achieve
profitability. Furthermore, even if we do achieve breakeven profitability and positive operating cash flow, we may not be able to sustain or increase profitability or positive operating cash flow on a
quarterly or annual basis. If our losses exceed the expectations of investors, the price of our common stock may decline.

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We have engaged in restructuring actions in order to reduce our operating expenses. These actions may not be sufficient to reduce our operating expenses
to the level that we need to achieve, and so we may need to engage in additional restructuring actions.

In November 2001, July 2002 and November 2002, we announced that we were taking further actions intended to reduce our expenses. Our
restructuring actions were designed to lower our cash used for operating expenses by reducing expenses for facilities, sales and marketing, hosting, professional services and marketing arrangements
and significantly reducing our current employee and contractor staffing levels. While restructuring actions have reduced cash operating expenses, our ability to adequately reduce cash used in
operations, and ultimately generate profitable results from operations, is dependent upon successful execution of our business plan, including obtaining new customers. During the year ended
March 31, 2003, we used cash for operating activities of $8.3 million. We cannot assure you that we will be successful in implementing our new business plan or sufficiently reducing our
operating expenses in the future. Our inability to generate adequate revenue growth and continue to develop successful product and services offerings could prevent us from successfully achieving
breakeven operations and result in additional restructuring actions.

Our quarterly operating results may fluctuate significantly and may not be predictive of future financial results.

We expect our quarterly operating results may fluctuate in the future, and may vary from investors' expectations, depending on a number of factors described below
and elsewhere in this "Business Risks" section of Annual Report on Form 10-K, including:



As
a result, quarterly comparisons may not indicate reliable trends of future performance.

We
base our expense levels in part upon our expectations concerning future revenue, and these expense levels are relatively fixed in the short term. If we have lower revenue, we may not
be able to reduce our spending in the short term in response. Any shortfall in revenue would have a direct impact on our results of operations.

In
the past we have taken actions intended to reduce our expenses on an annualized basis. Our cost-cutting actions leave us with less available capacity to deliver our
products and services. If there is a significant increase in demand from our estimates, it will take us longer to react to satisfy this demand, which would limit our ability to grow our business and
potentially become profitable.

Because our sales and implementation cycles are long and unpredictable, our revenues are difficult to predict and may not meet our expectations or those
of our investors.

The lengths of our sales and implementation cycles are difficult to predict and depend on a number of factors, including the type of product or services being
provided, the nature and size of the potential customer and the extent of the commitment being made by the potential customer. Our sales cycle is unpredictable and may take six months or more. Our
implementation cycle is also difficult to predict and can be longer than one year. Each of these can result in delayed revenues, increased selling

26

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expenses
and difficulty in matching revenues with expenses, which may contribute to fluctuations in our results of operations. A key element of our strategy is to market our product and service
offerings to large organizations. These organizations can have elaborate decision-making processes and may require evaluation periods, which could extend the sales and implementation cycle. Moreover,
we often must provide a significant level of education to our prospective customers regarding the use and benefit of our product and service offerings, which may cause additional delays during the
evaluation and acceptance process. We therefore have difficulty forecasting the timing and recognition of revenues from sales of our product and service offerings.

Our revenue is concentrated in a few customers, and if we lose any of these customers our revenue may decrease substantially

We receive a substantial majority of our revenue from a limited number of customers. In fiscal 2003, sales to our top two customers accounted for 28% of our
revenue, and sales to our top five customers accounted for 50% of our revenue. In fiscal 2002, sales to our top two customers collectively accounted for 29% of our revenue and sales to our top five
customers accounted for 49% of our revenue. We expect that a significant portion of our revenue will continue to depend on sales to a small number of customers. If we do not generate as much revenue
from these major customers as we expect to, or if we lose any of them as customers, our total revenue may be significantly reduced.

If we are unable to generate additional sales from existing customers and generate sales to new customers, we may not be able to generate sufficient
revenues to become profitable.

Our success depends on our ability to develop our existing customer relationships and establish relationships with additional pharmaceutical and biotechnology
companies. If we lose any significant relationships with existing customers or fail to establish additional relationships, we may not be able to execute our business plan and our business will suffer.
Developing customer relationships with pharmaceutical companies can be difficult for a number of reasons. These companies are often very large organizations with complex decision-making processes that
are difficult to change. In addition, because our products and services relate to the core technologies of these companies, these organizations are generally cautious about working with outside
companies. Some potential customers may also resist working with us until our products and services have achieved more widespread market acceptance. Our existing customers could also reassess their
commitment to us, not renew existing agreements or choose not to expand the scope of their relationship with us.

Our revenues and results of operations would be adversely affected if a customer cancels a contract for services with us.

Our services agreements can be canceled upon prior notice by our customers. Additionally, due to the nature of our services engagements, customers sometimes delay
projects because of timing of the clinical trials and the need for data and information that prevent us from proceeding with our projects. These delays and contract cancellations cannot be predicted
with accuracy and we cannot assure you that we will be able to replace any delayed or canceled contracts with the customer or other customers. If we are unable to replace those contracts, our revenues
and results of operations would be adversely affected.

We may lose existing customers or be unable to attract new customers if we do not develop new products and services or if our offerings do not keep pace
with technological changes.

The successful growth of our business depends on our ability to develop new products and services and incorporate new capabilities, including the expansion of our
product to address a broader set of customer needs related to clinical development of drugs and thereby expand the number of its prospective users, on a timely basis. If we cannot adapt to changing
technologies, emerging industry

27

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standards,
new scientific developments and increasingly sophisticated customer needs, we may not achieve revenue growth and our products and services may become obsolete, and our business could
suffer. We have suffered product delays in the past, resulting in lost product revenues. In addition, early releases of software often contain errors or defects. We cannot assure you that, despite our
extensive testing, errors will not be found in our products before or after commercial release, which could result in product redevelopment costs and loss of, or delay in, market acceptance.
Furthermore, a failure by us to introduce new products or services on schedule could harm our business prospects. Any delay or problems in the installation or implementation of new products or
services may cause customers to forego purchases from us.

If the security of our customers' data is compromised, we could be liable for damages and our reputation could be harmed.

As part of implementing our products and services, we inherently gain access to certain highly confidential proprietary customer information. It is critical that
our facilities and infrastructure remain secure and are perceived by the marketplace to be secure. Despite our implementation of a number of security measures, our infrastructure may be vulnerable to
physical break-ins, computer viruses, programming errors, attacks by third parties or similar disruptive problems. We do not have insurance to cover us for losses incurred in many of these
events. If we fail to meet our customers' security expectations, we could be liable for damages and our reputation could suffer.

If we are unable to complete a project due to scientific limitations or otherwise meet our customers' expectations, our reputation may be adversely
affected and we may not be able to generate new business.

Because our projects may contain scientific risks, which are difficult to foresee, we cannot guarantee that we will always be able to complete them. Any failure
to meet our customers' expectations could harm our reputation and ability to generate new business. On a few occasions, we have encountered scientific limitations and been unable to complete a
project. In each of these cases, we have been able to successfully renegotiate the terms of the project with the particular customer. We cannot assure you that we will be able to renegotiate our
customer agreements if such circumstances occur in the future. Moreover, even if we complete a project, we may not meet our customers' expectations regarding the quality of our products and services
or the timeliness of our services.

If we are unable to hire additional specialized personnel, we will not be able to grow our business.

Growth in the demand for our products and services will require additional personnel, particularly qualified scientific and technical personnel. We currently have
limited personnel and other resources to staff and complete projects. In addition, as we grow our business, we expect an increase in the number of complex projects and large deployments of our
products and services, which require a significant amount of personnel for extended periods of time. However, there is currently a shortage of these personnel worldwide, and competition for these
personnel from numerous companies and academic institutions may limit our ability to hire these persons on commercially reasonable terms. Staffing projects and deploying our products and services will
also become more difficult as our operations and customers become more geographically diverse. If we are not able to adequately staff and complete our projects, we may lose customers and our
reputation may be harmed. Any difficulties we may have in completing customer projects may impair our ability to grow our business.

If we lose key members of our management, scientific or development staff, or our scientific advisors, our reputation may be harmed and we may lose
business.

We are highly dependent on the principal members of our management, scientific and development staff. Our reputation is also in part based on our association with
key scientific advisors. The loss of any of these personnel might adversely impact our reputation in the market and harm our

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business.
Failure to attract and retain key management, scientific and technical personnel could prevent us from achieving our strategy and developing our products and services.

Our business depends on our intellectual property rights, and if we are unable to adequately protect them, our competitive position will suffer.

Our intellectual property is important to our competitive position. We protect our proprietary information and technology through a combination of patent,
trademark, trade secret and copyright law, confidentiality agreements and technical measures. We have filed thirteen patent applications, but do not currently have any patents issued. We cannot assure
you that the steps we have taken will prevent misappropriation of our proprietary information and technology, nor can we guarantee that we will be successful in obtaining any patents or that the
rights granted under such patents will provide a competitive advantage. Misappropriation of our intellectual property could harm our competitive position. We may also need to engage in litigation in
the future to enforce or protect our intellectual property rights or to defend against claims of invalidity, and we may incur substantial costs as a result. In addition, the laws of some foreign
countries provide less protection of intellectual property rights
than the laws of the United States and Europe. As a result, we may have an increasingly difficult time adequately protecting our intellectual property rights as our sales in foreign countries grow.

If we become subject to infringement claims by third parties, we could incur unanticipated expense and be prevented from providing our products and
services.

We cannot assure you that infringement claims by third parties will not be asserted against us or, if asserted, will be unsuccessful. These claims, whether or not
meritorious, could be expensive and divert management resources from operating our company. Furthermore, a party making a claim against us could secure a judgment awarding substantial damages, as well
as injunctive or other equitable relief that could block our ability to provide products or services, unless we obtain a license to such technology. In addition, we cannot assure you that licenses for
any intellectual property of third parties that might be required for our products or services will be available on commercially reasonable terms, or at all.

International sales of our product account for a significant portion of our revenue which exposes us to risks inherent in international operations.

We market and sell our products and services in the United States and internationally. International sales of our products and services accounted for
approximately 23% of our total revenues for the year ending March 31, 2003. We have a total of 7 employees based outside the United States that market and sell our products and services in
Europe. Our existing marketing efforts into international markets may require significant management attention and financial resources. We cannot be certain that our existing international operations
will produce desired levels of revenue. We currently have limited experience in developing localized versions of our products and services and marketing and distributing our products internationally.
Our operations in the United States and Europe also expose us to the following general risks associated with international operations:



29

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To
the extent that such disruptions and costs interfere with our commercial activities, our results of operations could be harmed.

Risks Related To Our Industry

Our market may not develop as quickly as expected, and companies may enter our market, thereby increasing the amount of competition and impairing our
business prospects.

Because our products and services are new and still evolving, there is significant uncertainty and risk as to the demand for, and market acceptance of, these
products and services. As a result, we are not able to predict the size and growth rate of our market with any certainty. In addition, other companies, including potential strategic partners, may
enter our market. Our existing customers may also elect to
terminate our services and internally develop products and services similar to ours. If our market fails to develop, grow more slowly than expected or become saturated with competitors, our business
prospects will be impaired.

Government regulation of the pharmaceutical industry may restrict our operations or the operations of our customers and, therefore, adversely affect our
business.

The pharmaceutical industry is regulated by a number of federal, state, local and international governmental entities. Although our products and services are not
directly regulated by the United States Food and Drug Administration or comparable international agencies, the use of some of our analytical software products by our customers may be regulated. We
currently provide assistance to our customers in achieving compliance with these regulations. The regulatory agencies could enact new regulations or amend existing regulations with regard to these or
other products that could restrict the use of our products or the business of our customers, which could harm our business.

Consolidation in the pharmaceutical industry could cause disruptions of our customer relationships and interfere with our ability to enter into new
customer relationships.

In recent years, the worldwide pharmaceutical industry has undergone substantial consolidation. If any of our customers consolidate with another business, they
may delay or cancel projects, lay off personnel or reduce spending, any of which could cause our revenues to decrease. In addition, our ability to complete sales or implementation cycles may be
impaired as these organizations undergo internal restructuring.

Reduction in the research and development budgets of our customers may impact our sales.

Our customers include researchers at pharmaceutical and biotechnology companies, academic institutions and government and private laboratories. Fluctuations in
the research and development budgets of these researchers and their organizations could have a significant effect on the demand for our products. Research and development budgets fluctuate due to
changes in available resources, spending priorities, internal budgetary policies and the availability of grants from government agencies. Our business could be harmed by any significant decrease in
research and development expenditures by pharmaceutical and biotechnology companies, academic institutions or government and private laboratories.

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Risks Related to Our Stock

Our common stock only trades on the Over the Counter bulletin board system, and has experienced depressed trading volumes and stock price since it began
to be traded there.

On November 8, 2002 our stock was removed from trading on the Nasdaq National Market as a result of failure to meet the continuing listing requirements. As
a result, our common stock is quoted only on the over-the-counter bulletin board. Consequently, our common stock does not experience large trading volumes, and has traded under
$1.00 per share since it was delisted in November 2002.

The public market for our common stock may be volatile.

The market price of our common stock has been, and we expect it to continue to be, highly volatile and to fluctuate significantly in response to various factors,
including:



In
addition, the stock markets have experienced extreme price and volume fluctuations, particularly in the past year, that have affected the market prices of equity securities of many
technology companies. These fluctuations have often been unrelated or disproportionate to operating performance. These broad market factors may materially affect the trading price of our common stock.
General economic, political and market conditions, such as recessions and interest rate fluctuations, may also have an adverse effect on the market price of our common stock.

Because our executive officers and directors have substantial control of our voting stock, takeovers not supported by them will be more difficult,
possibly preventing you from obtaining optimal share price.

The control of a significant amount of our stock by insiders could adversely affect the market price of our common stock. Entities affiliated with three of our
directors beneficially own or control a majority of the outstanding common stock, calculated on an as-if-converted basis, as of April 30, 2003. If these directors choose
to act or vote together, they will have the power to control all matters requiring the approval of our stockholders, including the election of directors and the approval of significant corporate
transactions. Without the consent of these stockholders, we could be prevented from entering into transactions that could result in our stockholders receiving a premium for their stock.

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ITEM 7A. QUALITATIVE AND QUANTITATIVE DISCLOSURES ABOUT MARKET RISKS

We have considered the provisions of Financial Reporting Release No. 48, "Disclosure of Accounting Policies for Derivative Financial Instruments and
Derivative Commodity Instruments, and Disclosure of Quantitative and Qualitative Information about Market Risk Inherent In Derivative Financial Instruments, Other Financial Instruments and Derivative
Commodity Instruments." We have no holdings of derivative financial or commodity-based instruments at March 31, 2003.

A
review of our other financial instruments and risk exposures at that date revealed that we have exposure to interest rate and foreign currency exchange rate risks. At March 31,
2003, we performed sensitivity analyses to assess the potential effect of these risks and concluded that
near-term changes in interest rates and foreign currency exchange rates would not materially affect our financial position, results of operations or cash flows.

We
have operated primarily in the United States and all funding activities and sales have been denominated in U.S. dollars. Accordingly, we have no material exposure to foreign currency
rate fluctuations.

Our
interest income is sensitive to changes in the general level of United States interest rates. Due to the nature of our short-term investments, consistent with our belief
as of March 31, 2002, we believe that there is no material market risk exposure. As of March 31, 2003, our cash, cash equivalents and short-term investments consisted
primarily of demand deposits and money market funds.

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

Supplementary Data

The following tables set forth unaudited quarterly supplementary data for each of the years in the two-year period ended March 31, 2003.

|                                                                               |  | Quarter Ended |       
|------------------------------------------------------------------------------ |  | ------------- | ------
|
|
|FISCAL 2003                                                                    |  |               |       
|Revenues                                                                       |  | $             | 3,455 
|Cost of revenues                                                               |  |               | 1,712 
|Gross profit                                                                   |  |               | 1,743 
|Loss from operations                                                           |  |               | (3,386
|Net loss applicable to common stockholders                                     |  |               | (3,471
|Net loss per common share applicable to common stockholders, basic and diluted |  | $             | (0.19 
|FISCAL 2002                                                                    |  |               |       
|Revenues                                                                       |  | $             | 2,744 
|Cost of revenues                                                               |  |               | 2,442 
|Gross profit                                                                   |  |               | 302   
|Loss from operations                                                           |  |               | (6,617
|Net loss applicable to common stockholders                                     |  |               | (6,450
|Net loss per common share applicable to common stockholders, basic and diluted |  | $             | (0.35 

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INDEX TO FINANCIAL STATEMENTS

|                                                                                        |  | Page
|--------------------------------------------------------------------------------------- |  | ----
|Pharsight Corporation                                                                   |  |     
|Management's Report                                                                     |  | 34  
|Report of Ernst & Young LLP, Independent Auditors                                       |  | 35  
|Balance Sheets                                                                          |  | 36  
|Statements of Operations                                                                |  | 37  
|Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) |  | 38  
|Statements of Cash Flows                                                                |  | 40  
|Notes to Financial Statements                                                           |  | 42  

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Management's Report

Management is responsible for all the information and representations contained in the financial statements and other sections of this
Form 10-K. Management believes that the financial statements have been prepared in conformity with accounting principles generally accepted in the United States and appropriate in
the circumstances to reflect in all material respects the substance of events and transactions that should be included, and that other information in this Form 10-K is consistent
with those statements. In preparing the financial statements, management makes informed judgments and estimates of the expected effects of events and transactions that are currently being accounted
for.

In
meeting its responsibility for the reliability of the financial statements, management depends on the Company's system of internal accounting control. This system is designed to
provide reasonable assurance that assets are safeguarded and transactions are executed in accordance with management's authorization, and are recorded properly to permit the preparation of financial
statements in accordance with generally accepted accounting principles. In designing control procedures, management recognizes that errors or irregularities may nevertheless occur. Also, estimates and
judgments are required to assess and balance the relative cost and expected benefits of the controls. Management believes that the Company's accounting controls provide reasonable assurance that
errors or irregularities that could be material to the financial statements are prevented or would be detected within a timely period by employees in the normal course of performing their assigned
functions.

The
Board of Directors pursues its oversight role for these financial statements through the Audit Committee, which is comprised solely of Directors who are not officers or employees of
the Company. The Audit Committee meets with management periodically to review their work and to monitor the discharge of each of their responsibilities. The Audit Committee also meets periodically
with Ernst & Young LLP, the independent auditors, who have free access to the Audit Committee of the Board of Directors, without management present, to discuss internal accounting control,
auditing, and financial reporting matters.

Ernst &
Young LLP, independent auditors, have audited the Company's financial statements. Their accompanying report is based on audits conducted in accordance with auditing
standards generally accepted in the United States, which require a review of the system of internal accounting controls and tests of accounting procedures and records to the extent necessary for the
purpose of their audits.

|/s/SHAWN M. O'CONNORShawn M. O'Connor President and Chief Executive
Officer |  | /s/CHARLES K. FAASCharles K. Faas Vice President, Finance and Chief
Financial Officer
|--------------------------------------------------------------------------- |  | -------------------------------------------------------------------------------------

June 9,
2003

34

---



Report of Ernst & Young LLP, Independent Auditors

The
Board of Directors and Stockholders
Pharsight Corporation

We
have audited the accompanying balance sheets of Pharsight Corporation as of March 31, 2003 and 2002, and the related statements of operations, redeemable convertible preferred
stock and stockholders' equity (deficit), and cash flows for each of the three years in the period ended March 31, 2003. Our audits also included the financial statement schedule listed in the
Index at Item 15(a). These financial statements and schedule are the responsibility of the Company's management. Our responsibility is to express an opinion on these financial statements and schedule
based on our audits.

We
conducted our audits in accordance with auditing standards generally accepted in the 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 financial statements referred to above present fairly, in all material respects, the financial position of Pharsight Corporation at March 31, 2003 and 2002,
and the results of its operations and its cash flows for each of the three years in the period ended March 31, 2003, in conformity with accounting principles generally accepted in the United
States. Also, in our opinion, the related financial statement schedule, when considered in relation to the basic financial statements taken as a whole, presents fairly in all material respects the
information set forth therein.

| |  | /s/ERNST & YOUNG LLP
| |  | --------------------

San
Jose, California
April 23, 2003
except for Note 15, as to which the date is
May 28, 2003

35

---



PHARSIGHT CORPORATION        BALANCE SHEETS        (In thousands, except share and per share amounts)

|                                                                                                                                                 |                                                                                               | March 31, |       
|------------------------------------------------------------------------------------------------------------------------------------------------ | --------------------------------------------------------------------------------------------- | --------- | ------
|
|Assets                                                                                                                                           |                                                                                               |           |       
|Current assets:                                                                                                                                  |                                                                                               |           |       
|                                                                                                                                                 | Cash and cash equivalents                                                                     |           | $     
|                                                                                                                                                 | Short-term investments                                                                        |           |       
|                                                                                                                                                 | Accounts receivable, net of allowance for doubtful accounts of $94 at March 31, 2003 and 2002 |           |       
|                                                                                                                                                 | Recognized income not yet billed                                                              |           |       
|                                                                                                                                                 | Prepaids and other current assets                                                             |           |       
|                                                                                                                                                 |                                                                                               |           |       
|Total current assets                                                                                                                             |                                                                                               |           | 14,153
|Property and equipment, net                                                                                                                      |                                                                                               |           | 1,177 
|Restricted cash                                                                                                                                  |                                                                                               |           |      
|Other assets                                                                                                                                     |                                                                                               |           | 244   
|                                                                                                                                                 |                                                                                               |           |       
|Total assets                                                                                                                                     |                                                                                               | $         | 15,574
|                                                                                                                                                 |                                                                                               |           |       
|Liabilities, redeemable convertible preferred stock, and stockholders' equity (deficit)                                                          |                                                                                               |           |       
|Current liabilities:                                                                                                                             |                                                                                               |           |       
|                                                                                                                                                 | Accounts payable                                                                              |           | $     
|                                                                                                                                                 | Accrued expenses                                                                              |           |       
|                                                                                                                                                 | Accrued compensation                                                                          |           |       
|                                                                                                                                                 | Deferred revenue                                                                              |           |       
|                                                                                                                                                 | Current portion of notes payable                                                              |           |       
|                                                                                                                                                 | Current obligations under capital leases                                                      |           |       
|                                                                                                                                                 |                                                                                               |           |       
|Total current liabilities                                                                                                                        |                                                                                               |           | 10,069
|Obligations under capital leases                                                                                                                 |                                                                                               |           | 55    
|Notes payable                                                                                                                                    |                                                                                               |           | 1,969 
|Redeemable convertible preferred stock, $0.001 par value:                                                                                        |                                                                                               |           |       
|Authorized shares3,200,000 (2,000,000 designated as Series A and 1,200,000 designated as Series B) at March 31, 2003 and none at March 31, 2002 |                                                                                               |           |       
|Issued and outstanding shares1,814,662 and none at March 31, 2003 and 2002, respectively                                                        |                                                                                               |           | 5,608 
|Aggregate redemption and liquidation value$7,500                                                                                                |                                                                                               |           |       
|Commitments and contingencies                                                                                                                    |                                                                                               |           |       
|Stockholders' equity (deficit):                                                                                                                  |                                                                                               |           |       
|Preferred stock, $0.001 par value:                                                                                                               |                                                                                               |           |       
|Authorized shares1,800,000 and 5,000,000 at March 31, 2003 and 2002, respectively,                                                              |                                                                                               |           |       
|Issued and outstanding sharesnone at March 31, 2003 and 2002                                                                                    |                                                                                               |           |       
|Common stock, $0.001 par value:                                                                                                                  |                                                                                               |           |       
|Authorized shares120,000,000 at March 31, 2003 and 2002                                                                                         |                                                                                               |           |       
|Issued and outstanding shares19,053,057 and 18,758,922 at March 31, 2003 and 2002, respectively                                                 |                                                                                               |           | 19    
|                                                                                                                                                 | Additional paid-in capital                                                                    |           |       
|                                                                                                                                                 | Deferred stock compensation                                                                   |           |       
|                                                                                                                                                 | Accumulated other comprehensive loss                                                          |           |       
|                                                                                                                                                 | Notes receivable from stockholders                                                            |           |       
|                                                                                                                                                 | Accumulated deficit                                                                           |           |       
|                                                                                                                                                 |                                                                                               |           |       
|Total stockholders' equity (deficit)                                                                                                             |                                                                                               |           | (2,127
|                                                                                                                                                 |                                                                                               |           |       
|Total liabilities, redeemable convertible preferred stock, and stockholders' equity (deficit)                                                    |                                                                                               | $         | 15,574
|                                                                                                                                                 |                                                                                               |           |       

The accompanying notes are an integral part of these financial statements.

36

---



PHARSIGHT CORPORATION        STATEMENTS OF OPERATIONS        (In thousands, except per share amounts)

|                                                                                              |                                                               | Years Ended March 31, |        
|--------------------------------------------------------------------------------------------- | ------------------------------------------------------------- | --------------------- | -------
|
|Revenues:                                                                                     |                                                               |                       |        
|                                                                                              | License and renewal                                           |                       | $      
|                                                                                              | Services                                                      |                       |        
|                                                                                              |                                                               |                       |        
|Total revenues                                                                                |                                                               |                       | 13,968 
|Costs and expenses:                                                                           |                                                               |                       |        
|                                                                                              | License and renewal(1)                                        |                       |        
|                                                                                              | Services(2)                                                   |                       |        
|                                                                                              | Research and development(3)                                   |                       |        
|                                                                                              | Sales and marketing(4)                                        |                       |        
|                                                                                              | General and administrative(5)                                 |                       |        
|                                                                                              | Amortization of deferred stock compensation                   |                       |        
|                                                                                              | Amortization and impairment of intangible assets and goodwill |                       |        
|                                                                                              | Restructuring costs                                           |                       |        
|                                                                                              |                                                               |                       |        
|Total costs and expenses                                                                      |                                                               |                       | 25,139 
|                                                                                              |                                                               |                       |        
|Loss from operations                                                                          |                                                               |                       | (11,171
|Other income (expense):                                                                       |                                                               |                       |        
|                                                                                              | Interest expense                                              |                       |        
|                                                                                              | Interest income (expense) and other, net                      |                       |        
|                                                                                              |                                                               |                       |        
|Total other income (expense)                                                                  |                                                               |                       | (371   
|                                                                                              |                                                               |                       |        
|Net loss                                                                                      |                                                               |                       | (11,542
|Preferred stock accretion                                                                     |                                                               |                       |       
|Preferred stock dividend                                                                      |                                                               |                       | (375   
|Deemed dividend to preferred stockholders                                                     |                                                               |                       | (246   
|                                                                                              |                                                               |                       |        
|Net loss applicable to common stockholders                                                    |                                                               | $                     | (12,163
|                                                                                              |                                                               |                       |        
|Basic and diluted net loss per share applicable to common stockholders                        |                                                               | $                     | (0.65  
|                                                                                              |                                                               |                       |        
|Shares used to compute basic and diluted net loss per share applicable to common stockholders |                                                               |                       | 18,800 

---

The
accompanying notes are an integral part of these financial statements.

37

---



PHARSIGHT CORPORATION

STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK
AND STOCKHOLDERS' EQUITY (DEFICIT)

(In thousands)

|                                                                                                     |  | Redeemable
Convertible
Preferred Stock |   | Convertible
Preferred Stock |         |   |        |   |   |    |   |        |  |   |    |  |   |        |   |   |        
|---------------------------------------------------------------------------------------------------- |  | -------------------------------------- | - | --------------------------- | ------- | - | ------ | - | - | -- | - | ------ |  | - | -- |  | - | ------ | - | - | -------
|
|
|
|Balance at March 31, 2000                                                                            |  | 5,455                                  |   | $                           | 18,582  |   | 5,232  |   | $ | 6  |   | 4,055  |  | $ | 4  |  | $ | 28,843 |   | $ | (3,459 
|Accretion of Series C preferred stock                                                                |  |                                       |   |                             | 174     |   |       |   |   |   |   |       |  |   |   |  |   |       |   |   |       
|Accretion of Series D preferred stock                                                                |  |                                       |   |                             | 269     |   |       |   |   |   |   |       |  |   |   |  |   |       |   |   |       
|Issuance of common stock in initial public offering, net of issuance costs                           |  |                                       |   |                             |        |   |       |   |   |   |   | 3,000  |  |   | 3  |  |   | 26,368 |   |   |       
|Conversion of redeemable convertible preferred stock and convertible preferred stock to common stock |  | (5,455                                 | ) |                             | (12,916 | ) | (5,232 | ) |   | (6 | ) | 10,687 |  |   | 10 |  |   | 9,364  |   |   |       
|Redemption of Series C redeemable convertible preferred stock                                        |  |                                       |   |                             | (6,109  | ) |       |   |   |   |   |       |  |   |   |  |   |       |   |   |       
|Issuance of common stock under employee benefit plans, net of repurchases                            |  |                                       |   |                             |        |   |       |   |   |   |   | 618    |  |   | 1  |  |   | 905    |   |   |       
|Issuance of common stock on net exercise of warrants                                                 |  |                                       |   |                             |        |   |       |   |   |   |   | 22     |  |   |   |  |   |       |   |   |       
|Interest on notes receivable from stockholders                                                       |  |                                       |   |                             |        |   |       |   |   |   |   |       |  |   |   |  |   |       |   |   |       
|Deferred stock compensation related to stock option grants                                           |  |                                       |   |                             |        |   |       |   |   |   |   |       |  |   |   |  |   | 10,070 |   |   | (10,070
|Amortization of deferred stock compensation                                                          |  |                                       |   |                             |        |   |       |   |   |   |   |       |  |   |   |  |   |       |   |   | 7,552  
|Reversal of deferred stock compensation for terminated employees                                     |  |                                       |   |                             |        |   |       |   |   |   |   |       |  |   |   |  |   | (780   | ) |   | 780    
|Comprehensive loss:                                                                                  |  |                                        |   |                             |         |   |        |   |   |    |   |        |  |   |    |  |   |        |   |   |        
|Unrealized loss on short-term investments                                                            |  |                                       |   |                             |        |   |       |   |   |   |   |       |  |   |   |  |   |       |   |   |       
|Net loss                                                                                             |  |                                       |   |                             |        |   |       |   |   |   |   |       |  |   |   |  |   |       |   |   |       
|                                                                                                     |  |                                        |   |                             |         |   |        |   |   |    |   |        |  |   |    |  |   |        |   |   |        
|Total comprehensive loss                                                                             |  |                                        |   |                             |         |   |        |   |   |    |   |        |  |   |    |  |   |        |   |   |        
|                                                                                                     |  |                                        |   |                             |         |   |        |   |   |    |   |        |  |   |    |  |   |        |   |   |        
|Balance at March 31, 2001                                                                            |  |                                       |   | $                           |        |   |       |   | $ |   |   | 18,382 |  | $ | 18 |  | $ | 74,770 |   | $ | (5,197 
|                                                                                                     |  |                                        |   |                             |         |   |        |   |   |    |   |        |  |   |    |  |   |        |   |   |        

The accompanying notes are an integral part of these financial statements.

38

---

PHARSIGHT CORPORATION

STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK
AND STOCKHOLDERS' EQUITY (DEFICIT) (Continued)

(In thousands)

|                                                                                                                   |  | Redeemable
Convertible
Preferred Stock |  | Convertible
Preferred Stock |       |  |   |  |   |   |  |        |  |   |    |  |   |        |   |   |       
|------------------------------------------------------------------------------------------------------------------ |  | -------------------------------------- |  | --------------------------- | ----- |  | - |  | - | - |  | ------ |  | - | -- |  | - | ------ | - | - | ------
|
|
|
|Balance at March 31, 2001                                                                                          |  |                                       |  | $                           |      |  |  |  | $ |  |  | 18,382 |  | $ | 18 |  | $ | 74,770 |   | $ | (5,197
|Issuance of common stock under employee benefit plans, net of repurchases                                          |  |                                       |  |                             |      |  |  |  |   |  |  | 377    |  |   | 1  |  |   | 320    |   |   |      
|Interest on notes receivable from stockholders                                                                     |  |                                       |  |                             |      |  |  |  |   |  |  |       |  |   |   |  |   |       |   |   |      
|Write off of notes receivable from stockholders                                                                    |  |                                       |  |                             |      |  |  |  |   |  |  |       |  |   |   |  |   |       |   |   |      
|Amortization of deferred stock compensation                                                                        |  |                                       |  |                             |      |  |  |  |   |  |  |       |  |   |   |  |   |       |   |   | 2,993 
|Reversal of deferred stock compensation for terminated employees                                                   |  |                                       |  |                             |      |  |  |  |   |  |  |       |  |   |   |  |   | (505   | ) |   | 505   
|Issuance of restricted common stock to officer as a bonus                                                          |  |                                       |  |                             |      |  |  |  |   |  |  |       |  |   |   |  |   | 114    |   |   | (114  
|Acceleration of option vesting                                                                                     |  |                                       |  |                             |      |  |  |  |   |  |  |       |  |   |   |  |   | 35     |   |   |      
|Issuance of options in consideration for service                                                                   |  |                                       |  |                             |      |  |  |  |   |  |  |       |  |   |   |  |   | 20     |   |   |      
|Comprehensive loss:                                                                                                |  |                                        |  |                             |       |  |   |  |   |   |  |        |  |   |    |  |   |        |   |   |       
|Unrealized loss on short-term investments                                                                          |  |                                       |  |                             |      |  |  |  |   |  |  |       |  |   |   |  |   |       |   |   |      
|Net loss                                                                                                           |  |                                       |  |                             |      |  |  |  |   |  |  |       |  |   |   |  |   |       |   |   |      
|                                                                                                                   |  |                                        |  |                             |       |  |   |  |   |   |  |        |  |   |    |  |   |        |   |   |       
|Total comprehensive loss                                                                                           |  |                                        |  |                             |       |  |   |  |   |   |  |        |  |   |    |  |   |        |   |   |       
|                                                                                                                   |  |                                        |  |                             |       |  |   |  |   |   |  |        |  |   |    |  |   |        |   |   |       
|Balance at March 31, 2002                                                                                          |  |                                       |  |                             |      |  |  |  |   |  |  | 18,759 |  |   | 19 |  |   | 74,754 |   |   | (1,813
|Issuance of common stock under employee benefit plans, net of repurchases                                          |  |                                       |  |                             |      |  |  |  |   |  |  | 131    |  |   |   |  |   | 55     |   |   |      
|Issuance of Series A redeemable convertible preferred stock, net of issuance costs of $268, and discount of $1,870 |  | 1,815                                  |  |                             | 5,362 |  |  |  |   |  |  |       |  |   |   |  |   | 1,870  |   |   |      
|Deemed dividend to Series A redeemable convertible preferred stockholders                                          |  |                                       |  |                             | 246   |  |  |  |   |  |  |       |  |   |   |  |   | (246   | ) |   |      
|Accrued dividends on Series A redeemable convertible preferred stock                                               |  |                                       |  |                             |      |  |  |  |   |  |  |       |  |   |   |  |   | (375   | ) |   |      
|Amortization of deferred stock compensation                                                                        |  |                                       |  |                             |      |  |  |  |   |  |  |       |  |   |   |  |   |       |   |   | 1,322 
|Reversal of deferred stock compensation for terminated employees                                                   |  |                                       |  |                             |      |  |  |  |   |  |  |       |  |   |   |  |   | (139   | ) |   | 139   
|Issuance of options in consideration for service                                                                   |  |                                       |  |                             |      |  |  |  |   |  |  |       |  |   |   |  |   | 8      |   |   |      
|Issuance of common stock to officer                                                                                |  |                                       |  |                             |      |  |  |  |   |  |  | 163    |  |   |   |  |   |       |   |   |      
|Repayment of stockholder note receivable                                                                           |  |                                       |  |                             |      |  |  |  |   |  |  |       |  |   |   |  |   |       |   |   |      
|Comprehensive Loss:                                                                                                |  |                                        |  |                             |       |  |   |  |   |   |  |        |  |   |    |  |   |        |   |   |       
|Unrealized income on short-term investments                                                                        |  |                                       |  |                             |      |  |  |  |   |  |  |       |  |   |   |  |   |       |   |   |      
|Net loss                                                                                                           |  |                                       |  |                             |      |  |  |  |   |  |  |       |  |   |   |  |   |       |   |   |      
|                                                                                                                   |  |                                        |  |                             |       |  |   |  |   |   |  |        |  |   |    |  |   |        |   |   |       
|Total comprehensive loss                                                                                           |  |                                        |  |                             |       |  |   |  |   |   |  |        |  |   |    |  |   |        |   |   |       
|                                                                                                                   |  |                                        |  |                             |       |  |   |  |   |   |  |        |  |   |    |  |   |        |   |   |       
|Balance at March 31, 2003                                                                                          |  | 1,815                                  |  | $                           | 5,608 |  |  |  | $ |  |  | 19,053 |  | $ | 19 |  | $ | 75,927 |   | $ | (352  
|                                                                                                                   |  |                                        |  |                             |       |  |   |  |   |   |  |        |  |   |    |  |   |        |   |   |       

The accompanying notes are an integral part of these financial statements.

39

---



PHARSIGHT CORPORATION        STATEMENTS OF CASH FLOWS        (In thousands)

|                                                                            |                                                                 | Years Ended March 31,            |        
|--------------------------------------------------------------------------- | --------------------------------------------------------------- | -------------------------------- | -------
|
|Operating activities                                                        |                                                                 |                                  |        
|Net loss                                                                    |                                                                 | $                                | (11,542
|Adjustments to reconcile net loss to net cash used in operating activities: |                                                                 |                                  |        
|                                                                            | Amortization of deferred stock compensation                     |                                  |        
|                                                                            | Depreciation and amortization                                   |                                  |        
|                                                                            | Amortization of intangible assets                               |                                  |        
|                                                                            | Restructuring charges                                           |                                  |        
|                                                                            | Issuance of options in consideration for services               |                                  |        
|                                                                            | Compensation expenses related to accelerated vesting of options |                                  |        
|                                                                            | Changes in operating assets and liabilities:                    |                                  |        
|                                                                            |                                                                 | Accounts receivable              |        
|                                                                            |                                                                 | Recognized income not yet billed |        
|                                                                            |                                                                 | Other current assets             |        
|                                                                            |                                                                 | Prepaids and other assets        |        
|                                                                            |                                                                 | Accounts payable                 |        
|                                                                            |                                                                 | Accrued expenses                 |        
|                                                                            |                                                                 | Accrued compensation             |        
|                                                                            |                                                                 | Deferred revenue                 |        
|                                                                            |                                                                 | Accrued interest and other       |        
|                                                                            |                                                                 |                                  |        
|Net cash used in operating activities                                       |                                                                 |                                  | (8,293 
|Investing activities                                                        |                                                                 |                                  |        
|Purchases of property and equipment                                         |                                                                 |                                  | (216   
|Purchases of short-term investments                                         |                                                                 |                                  |       
|Maturities of short-term investments                                        |                                                                 |                                  | 2,995  
|Transfer from (to) restricted cash                                          |                                                                 |                                  | 150    
|Acquisition of Metazoa.com                                                  |                                                                 |                                  |       
|                                                                            |                                                                 |                                  |        
|Net cash provided by investing activities                                   |                                                                 |                                  | 2,929  
|Financing activities                                                        |                                                                 |                                  |        
|Proceeds from lease line                                                    |                                                                 |                                  |       
|Proceeds from issuance of notes payable                                     |                                                                 |                                  | 750    
|Principal payments on notes payable                                         |                                                                 |                                  | (1,406 
|Principal payments on capital lease obligations                             |                                                                 |                                  | (660   
|Proceeds from the issuance of common stock                                  |                                                                 |                                  | 55     
|Payments made on notes receivable from stockholders                         |                                                                 |                                  | 96     
|Net proceeds from the issuance of redeemable convertible preferred stock    |                                                                 |                                  | 7,232  
|Dividends paid to preferred stockholders                                    |                                                                 |                                  | (326   
|Redemption of redeemable convertible preferred stock                        |                                                                 |                                  |       
|                                                                            |                                                                 |                                  |        
|Net cash provided by financing activities                                   |                                                                 |                                  | 5,741  
|                                                                            |                                                                 |                                  |        
|Net (decrease) increase in cash and cash equivalents                        |                                                                 |                                  | 377    
|Cash and cash equivalents at the beginning of the year                      |                                                                 |                                  | 10,498 
|                                                                            |                                                                 |                                  |        
|Cash and cash equivalents at the end of the year                            |                                                                 | $                                | 10,875 
|                                                                            |                                                                 |                                  |        
|                                                                            |                                                                 |                                  |        

40

---

|Supplemental disclosures of non cash activities                                     |  |   |        |   |   |      |   |   |        |  
|----------------------------------------------------------------------------------- |  | - | ------ | - | - | ---- | - | - | ------ | -
|Property and equipment acquired under capital leases                                |  |   |       |   |   |     |   |   | 1,000  |  
|Deferred stock compensation                                                         |  |   |       |   |   | 114  |   |   | 10,070 |  
|Reversal of deferred stock compensation upon cancellation of unvested stock options |  |   | (139   | ) |   | (505 | ) |   | (780   | )
|Discount on redeemable convertible preferred stock                                  |  |   | (1,870 | ) |   |     |   |   |       |  
|Deemed dividend to preferred stockholders                                           |  |   | 246    |   |   |     |   |   |       |  
|Preferred stock dividend                                                            |  |   | 49     |   |   |     |   |   |       |  
|Accretion of preferred stock                                                        |  |   |       |   |   |     |   |   | 443    |  
|Conversion of preferred stock to common stock                                       |  |   |       |   |   |     |   |   | 9,374  |  
|Reversal of preferred stock accretion upon conversion                               |  |   |       |   |   |     |   |   | 3,548  |  
|Supplemental disclosure of cash flow information                                    |  |   |        |   |   |      |   |   |        |  
|Cash paid for interest                                                              |  | $ | 329    |   | $ | 245  |   | $ | 319    |  
|Cash paid for taxes                                                                 |  | $ | 36     |   | $ | 37   |   | $ | 30     |  

The
accompanying notes are an integral part of these financial statements.

41

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PHARSIGHT CORPORATION

NOTES TO FINANCIAL STATEMENTS

1.     Description of Business

Pharsight Corporation ("Pharsight" or the "Company") develops and markets integrated products and services that help pharmaceutical and biotechnology companies
improve the drug development process. Pharsight's products and services combine proprietary computer-based simulation, statistical and data analysis tools with the sciences of pharmacology, drug and
disease modeling, human genetics and biostatistics. Pharsight Corporation was incorporated in California on April 4, 1995 and reincorporated in Delaware in June 2000.

Pharsight
operates in only one business segment comprised of products and services to pharmaceutical and biotechnology companies to improve the drug development process. Sales are
primarily generated in the United States and Europe through a direct field sales organization.

As
of March 31, 2003, Pharsight had working capital of $4.1 million and had stockholders' deficit of $2.1 million. During 2003, Pharsight used cash and cash
equivalents in operating activities of $8.3 million. The net increase in cash from operating, investing and financing activities in 2003 was approximately $377,000. Management believes that its
restructuring activities have reduced its ongoing operating expenses and that it will have sufficient working capital to support Pharsight's planned activities through fiscal year 2004. Pharsight is
committed to the successful execution of its operating plan and will take further action as necessary to ensure the Company's cash resources are sufficient to fund Pharsight's presently anticipated
operating losses and working capital requirements at least through fiscal 2004.

2.     Summary of Significant Accounting Policies

Use of Estimates

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

Cash and Cash Equivalents

Cash and cash equivalents are comprised of highly liquid financial instruments consisting primarily of investments in money market funds, commercial paper,
corporate notes and obligations issued by or fully collateralized by the U.S. government or federal agencies with insignificant interest rate risk and with original maturities of three months or less
at the time of acquisition.

Short-term Investments

All investments are designated as available-for-sale and are carried at fair value, with unrealized gains and losses, net of tax, reported
in stockholders' equity. The cost of securities sold is based on the specific identification method. Realized gains or losses and declines in value, if any, judged to be
other-than-temporary, are reported in interest income and other, net. Short-term investments consist of securities available-for-sale that
mature within twelve months of purchase.

42

---

Short-term
investments consisted of the following (in thousands):

Amortized
Cost

Gross
Unrealized
Gains

Gross
Unrealized
Losses

Fair
Market
ValueMarch 31, 2002Money market funds, commercial paper and treasury instruments

$
2,495

$


$


$
2,495Corporate notes


500





(1
)

499$
2,995

$


$
(1
)
$
2,994


There
were no short-term investments for the year ended March 31, 2003. Gross realized gains and losses were insignificant for all periods presented.

Fair Value of Financial Instruments

The carrying values of Pharsight's cash and cash equivalents, short-term investments, accounts receivable and payable, and accrued liabilities
approximate their fair values due to their short-term nature. The fair values of the capital lease obligations and notes payable are estimated based on current interest rates available to
Pharsight for debt instruments with similar terms, degrees of risk, and remaining maturities. The carrying values of these obligations approximate their respective fair values.

Property and Equipment

Property and equipment are carried at cost less accumulated depreciation. Depreciation is computed using the straight-line method over the estimated
useful lives of three to five years. Property under capital leases is amortized over the lesser of the useful lives of the assets or the lease term. Amortization expense related to these assets is
included in depreciation expense.

Internal Use Software

Pharsight accounts for internal use software costs, in accordance with Statement of Position No. 98-1, "Accounting for the Costs of Computer
Software Developed or Obtained for Internal Use" ("SOP 98-1"). In accordance with SOP 98-1, Pharsight capitalizes costs to develop software for internal uses when preliminary
development efforts are successfully completed and management has authorized and committed project funding and it is probable that the project will be completed and the software will be used as
intended. Costs incurred prior to meeting these criteria, together with costs incurred for training and maintenance, are expensed. Costs incurred for upgrades and enhancements that are probable to
result in additional functionality are also capitalized. All capitalized costs are included in property, plant and equipment and are amortized to expense over their expected useful lives.

Restricted Cash

At March 31, 2002 the Company had $150,000 of restricted cash for a lease deposit on the Company's facilities. At March 31, 2003, there was no
restricted cash because the lease for the Company's facilities was renegotiated and eliminated this requirement.

Deferred Revenue

Deferred revenue is primarily comprised of license fees (initial and renewal), which are recognized ratably over the one-year period of the license.
In addition, deferred revenue includes services and training revenue, which will be recognized as services are performed and fees for arrangements that include implementation services that have not
been completed.

43

---

Income Taxes

Pharsight accounts for income taxes under the liability method whereby deferred tax asset or liability account balances are calculated at the balance sheet date
using current tax laws and rates in effect for the year in which the differences are expected to affect taxable income. Valuation allowances are established when necessary to reduce deferred tax
assets to the amounts expected to be realized.

Revenue Recognition

Pharsight's revenues are derived from two primary sources: initial and renewal fees for product licenses and scientific and training consulting services.
Additionally, Pharsight had an insignificant amount of revenue from subscriptions related to Pharsight's information products in fiscal 2002.

Pharsight's
revenue recognition policy is in accordance with Statement of Position No. 97-2, "Software Revenue Recognition," or SOP 97-2 as amended by
Statement of Position No. 98-4, "Deferral of the Effective Date of SOP 97-2, "Software Revenue Recognition,' "or SOP 98-4, and Statement of Position
No. 98-9, "Modification of SOP No. 97-2 with Respect to Certain Transactions," or SOP 98-9. For each arrangement, Pharsight determines whether
evidence of an arrangement exists, delivery has occurred, the fee is fixed or determinable, and collection is probable. If any of these criteria are not met, Pharsight defers revenue recognition until
such time as all of the criteria are met. Pharsight does not currently offer, has not offered in the past, and does not expect to offer in the future, extended payment term arrangements. If Pharsight
does not consider collectibility to be probable, Pharsight recognizes revenue when the fee is collected. No customer has the right of return.

Contracts from which Pharsight receives solely license and renewal fees consist of one-year software licenses (initial and renewal fees) bundled with
post contract support services, or PCS.Pharsight does not have vendor specific objective evidence to allocate the fee to the separate elements, as Pharsight does
not sell PCS separately. Pharsight recognizes each of the initial and renewal license fees ratably over the one year period of the license during which the PCS is expected to be provided as required
by paragraph 12 of SOP 97-2.

Pharsight
does not present PCS revenue separately as Pharsight does not have vendor specific objective evidence of PCS, and Pharsight does not believe other allocation methodologies,
namely allocation based on relative costs, provide a meaningful and supportable allocation between license and PCS revenues.

For arrangements consisting solely of services Pharsight recognizes revenue as services are performed.Arrangements for
services may be charged at daily rates for different levels of consultants and out of
pocket expenses or may be for a fixed fee. For fixed fee contracts with payments based on milestones or acceptance criteria, Pharsight recognizes revenue as such milestones are achieved or upon
acceptance, which approximates the level of services provided. For fixed fee arrangements at the end of each accounting period (i) Pharsight analyzes the appropriateness of the daily rates
charged based upon total fees to be charged and total hours to be incurred, and (ii) Pharsight determines if losses should be recognized.

Pharsight also enters into arrangements consisting of licenses, renewal fees and scientific consulting services.The
scientific consulting services meet the criteria of paragraph 65 of SOP 97-2 for separate accounting. As the only undelivered elements are services and PCS, and the PCS term
(expressed or implied) and the period over which Pharsight expects the services to be performed are the same period, Pharsight recognizes revenue based on the lesser of actual services performed and
licenses delivered or straight line over the period of the agreement. If the PCS term and the period over which Pharsight expects the services to be performed are not the same period, Pharsight
recognizes revenue based on the lesser of actual services performed and licenses delivered or straight line over the longer of the PCS term and the period over which Pharsight expects the services to
be performed. Vendor specific

44

---

objective
evidence of fair value of scientific services for purposes of revenue recognition in these multiple element arrangements is based on daily rates for different levels of consultants and out
of pocket expenses.

Pharsight also has arrangements that consist of licenses, PCS and implementation/installation services.For arrangements
involving a significant amount of services related to installation and implementation of the Company's software products, the Company recognizes revenue for the entire arrangement fee ratably over the
remaining period of the PCS term once the services are completed and accepted by the customer. The Company currently does not have vendor specific objective evidence for its PCS.

Pharsight has arrangements for subscription fees to information products.Pharsight recognizes revenue from the subscription
to information products over the contract period, provided Pharsight has evidence of an arrangement, the price of the subscription is fixed or determinable and payment is reasonably assured. The
subscription fees have been included in license revenues.

Pharsight
has one international distributor. There is no right of return or price protection for sales to the international distributor. Sales are made to the distributor using a
sell-in model. Revenue from this distributor in fiscal 2003 was less than 2%. Revenues from this distributor for fiscal 2002 and 2001 were less than 1% of total revenues.

Shipping Costs

The Company's shipping and handling costs are included under cost of license and renewal for all periods presented.

Research and Development

Pharsight capitalizes eligible computer software costs as products achieve technological feasibility, subject to net realizable value considerations. Pharsight
has defined technological feasibility as completion of a working model. As of March 31, 2003 and 2002, such internal capitalizable costs were insignificant. Accordingly, Pharsight has charged
all such internal costs to research and development expenses in the accompanying statements of operations.

Advertising

Pharsight expenses the cost of advertising as incurred. These costs were insignificant in all periods presented.

Net Loss per Share

Basic net loss per share is computed using the weighted-average number of outstanding shares of common stock. Diluted net loss per share is computed using the
weighted-average number of shares of vested common stock outstanding and, when dilutive, unvested common stock outstanding, potential common shares from options and warrants to purchase common stock
using the treasury stock method and from convertible securities using the as-if-converted basis. All potential common shares have been excluded from the computation of diluted
net loss per share for all periods presented because the effect would be antidilutive, due to the Company's net loss in each period.

45

---

The
following table presents the calculation of basic and diluted net loss per share (in thousands, except per share amounts):

Years Ended March 31,2003

2002

2001Net loss

$
(11,542
)
$
(18,952
)
$
(20,571
)Preferred stock accretion








(443
)Preferred stock dividend


(375
)




Deemed dividend to preferred stockholders


(246
)




Net loss applicable to common stockholders

$
(12,163
)
$
(18,952
)
$
(21,014
)Basic and diluted:Weighted average common shares outstanding


18,843


18,559


13,317Less weighted average common shares subject to repurchase


(43
)

(140
)

(343
)Shares used to compute basic and diluted net loss per share applicable to common stockholders


18,800


18,419


12,974Basic and diluted net loss per share applicable to common stockholders

$
(0.65
)
$
(1.03
)
$
(1.62
)


The
number of unvested and potential common shares excluded from the calculation of diluted net loss per share applicable to common stockholders at March 31, 2003, 2002, and 2001
is detailed in the following table (in thousands):

March 31,2003

2002

2001Outstanding options

3,113

4,452

3,541Warrants

2,091

276

276Redeemable convertible preferred stock

7,259



12,463

4,728

3,817


These
instruments were excluded because their effect would be antidilutive.

Stock-Based Compensation

The Company generally grants stock options to its employees for a fixed number of shares with an exercise price equal to the fair market value of the stock on the
date of grant. As permitted under the Statement of Financial Accounting Standard No. 123, Accounting for Stock-Based Compensation ("FAS 123"), the Company has elected to follow
Accounting Principles Board Opinion No. 25, Accounting for Stock Issued to Employees ("APB 25") and related interpretations in accounting for stock awards to employees. Accordingly, no
compensation expense is recognized in the Company's financial statements in connection with employee stock awards where the exercise price of the award is equal to the fair market value of the stock
at the date of the award. When stock options are granted with an exercise price that is lower than the fair market value of the stock on the date of grant, the
difference is recorded as deferred compensation and amortized to expense on a graded basis over the vesting term of the stock options.

Pro
forma information regarding net loss and net loss per share is required by FAS 123. This information is required to be determined as if the Company had accounted for its
employee stock

46

---

options
(including shares issued under the Employee Stock Purchase Plan, collectively called "stock-based awards"), under the fair value method of that statement.

The
fair value of the Company's stock based awards to employees was estimated assuming no expected dividends and the following weighted-average assumptions:

ESPP
Years Ended March 31,

Options
Years Ended March 31,2003

2002

2001

2003

2002

2001Expected life (years)

.50

.50

.50

3.74

3.9

3.00Expected stock price volatility

307.0
%
127.0
%
80.0
%
198.0
%
127.0
%
80.0
%Risk-free interest rate

1.64
%
2.80
%
5.60
%
2.58
%
3.94
%
4.25
%


For
purposes of pro forma disclosures, the estimated fair value of the stock-based awards is amortized to expense over the awards' vesting period. The Company's pro forma information is
as follows (in thousands, except per share amount):

Years Ended March 31,2003

2002

2001Net loss applicable to common stockholders, as reported

$
(12,163
)
$
(18,952
)
$
(21,014
)Add back:Stock-based employee compensation included in reported net loss


1,322


2,993


7,552Less:Total stock-based employee compensation expense determined under the fair value method for all awards


(2,305
)

(2,305
)

(9,620
)Pro forma net loss applicable to common stockholders

$
(13,146
)
$
(18,264
)
$
(23,082
)Basic and diluted net loss per share applicable to common stockholders, as reported

$
(0.65
)
$
(1.02
)
$
(1.62
)Pro forma basic and diluted net loss per share applicable to common stockholders

$
(0.70
)
$
(0.98
)
$
(1.78
)


The
option valuation models were developed for use in estimating the fair value of traded options, which have no vesting restrictions and are fully transferable. In addition, option
valuation models require the input of highly subjective assumptions, including the expected stock price volatility. Because Pharsight's employee stock options have characteristics significantly
different from those of traded options and because changes in the subjective input assumptions can materially affect the fair value estimate, in management's opinion, the existing models do not
necessarily provide a reliable single measure of the fair value of its employee stock options.

Pharsight
accounts for equity instruments issued to non-employees in accordance with the provisions of SFAS 123 and Emerging Issues Task Force ("EITF")
96-18, Accounting for Equity Instruments that are Issued to Other Than Employees for Acquiring, or in Conjunction with Selling Goods or Services.

Other Comprehensive Income (Loss)

Statement of Financial Accounting Standards No. 130, "Reporting Comprehensive Income" ("SFAS 130"), requires Pharsight to display comprehensive
income (loss) and its components as part of the financial statements. Other comprehensive income (loss) includes certain changes in equity that are

47

---

excluded
from net income (loss). Pharsight's only component of other comprehensive income (loss) is unrealized gain (loss) on available-for-sale marketable securities for the
years ended March 31, 2003 and 2002, respectively.

Goodwill and Other Intangible Assets

In June 2001, the Financial Accounting Standards Board ("FASB") issued Statement No. 141, Business Combinations, and Statement No. 142,
Goodwill and Other Intangible Assets. Statement No. 141 requires that the purchase method of accounting be used for all business combinations initiated after June 30, 2001. Statement
No. 142 requires that goodwill and other intangible assets with indefinite useful lives no longer be amortized, but instead an entity must perform an assessment of whether these assets are
impaired as of the date of adoption and test for impairment at least annually in accordance with the provisions of Statement No. 142. The standards also require that intangible assets with
definite useful lives be amortized over their respective estimated useful lives to their estimated residual values, and reviewed annually for impairment. The Company adopted the provisions of
Statement No. 141 on July 1, 2001 and Statement No. 142 on April 1, 2002. The adoption of Statement No. 141 or 142 did not have a significant impact on the Company's
financial position and results of operations.

The
following tables present net loss and loss per share applicable to common stockholders as reported and adjusted to exclude the amortization of goodwill and assembled workforce as if
these items had not been amortized (in thousands except per share data).

|                                                       |  | Year Ended March 31, |        
|------------------------------------------------------ |  | -------------------- | -------
|
|
|Net loss applicable to common stockholders             |  | $                    | (12,163
|Add back goodwill and assembled workforce amortization |  |                      |       
|                                                       |  |                      |        
|Adjusted net loss applicable to common stockholders    |  | $                    | (12,163
|                                                       |  |                      |        

Recent Accounting Pronouncements

Accounting for Costs Associated with Exit and Disposal Activities

In July 2002, the FASB issued Statement of Financial Accounting Standards No. 146 ("FAS 146"),Accounting for Costs
Associated with Exit and Disposal Activities. This statement revises the accounting for exit and disposal activities under Emerging Issues Task Force Issue 94-3
("EIFT 94-3"),Liability Recognition for Certain Employee Termination Benefits and Other Costs to Exit an Activity, by spreading out the
reporting of expenses related to restructuring activities. Commitment to a plan to exit an activity or dispose of long-lived assets will no longer be sufficient to record a
one-time charge for most anticipated costs. Instead, companies will record exit or disposal costs when they are "incurred" and can be measured at fair value, and they will subsequently
adjust the recorded liability for changes in estimated cash flows. The provisions of SFAS No. 146 are effective prospectively for exit or disposal activities initiated after December 31,
2002. Companies may not restate previously issued financial statements for the effect of the provisions of SFAS No. 146. In addition, liabilities that a company previously recorded under EITF
Issue No. 94-3 are grandfathered. The restructuring activities initiated by the Company in November 2001, July 2002 and November 2002 have been accounted for
under the

48

---

provisions
of EITF 94-3. The Company adopted SFAS 146 on January 1, 2003. The adoption of SFAS No. 146 did not have a material impact on the Company's financial
position or results of operations.

Accounting for Stock-Based Compensation-Transition and Disclosure

In December 2002, the FASB issued Statement of Financial Accounting Standards No. 148, "Accounting for Stock-Based
CompensationTransition and Disclosure" ("Statement 148"). Statement 148 amends Statement of Financial Accounting Standards No. 123, "Accounting for Stock-Based
Compensation," ("Statement 123") and provides alternative methods of transition for a voluntary change to the fair value based method of accounting for stock-based employee compensation.
Statement 148 also amends the disclosure requirements of Statement 123 to require more prominent and frequent disclosures in financial statements about the effects of stock-based
compensation. The transition guidance and annual disclosure provisions of Statement148 are effective for financial statements issued for fiscal years ending after December 15, 2002 for interim
periods beginning after December 15, 2002. Accordingly, the Company adopted the disclosure provisions of this statement in its financial statements of fiscal year 2003.

Guarantor's Accounting Disclosure Requirements for Guarantees, Including Indirect Guarantees of Indebtedness of Others

In December 2002, the FASB issued Interpretation No. 45, "Guarantor's Accounting and Disclosure Requirements for Guarantees, Including Indirect
Guarantees of Indebtedness of Others ("FIN 45")."
FIN 45 elaborates on the disclosures to be made by a guarantor in its interim and annual financial statements about its obligations under certain guarantees that it has issued. It also clarifies that
a guarantor is required to recognize, at the inception of a guarantee, a liability for the fair value of the obligation undertaken in issuing the guarantee. The Company has adopted the disclosure
requirements of FIN 45 as of December 31, 2002. In addition, the Company is required to adopt the initial recognition and measurement of the fair value of the obligation undertaken in issuing
the guarantee on a prospective basis to guarantees issued or modified after December 31, 2002. The Company does not believe FIN 45 will have a material effect on the Company's operations,
financial position or cash flows.

3. Property and Equipment

Property and equipment are stated at cost and consist of the following (in thousands):

March 31,2003

2002Furniture and fixtures

$
647

$
647Computers and equipment


5,286


5,125Leasehold improvements


188


1806,121


5,952Accumulated depreciation and amortization


(4,944
)

(3,244
)$
1,177

$
2,708


49

---

Property and equipment includes assets acquired under capital lease obligations with a cost of $2,491,000 at March 31, 2003 and 2002, and accumulated amortization of $2,343,000
and $1,933,000 at March 31, 2003 and 2002, respectively.

Depreciation
expense was $1,327,000, $924,000 and $163,000 for the years ended March 31, 2003, 2002, and 2001, respectively.

Amortization
expense of assets acquired under capital lease obligations was $410,000, $648,000 and $714,000 for the years ended March 31, 2003, 2002, and 2001, respectively.

4. Acquisition

In February 2001, Pharsight acquired the assets of Metazoa.com, a privately held company that develops collaborative software for the life science research
community. Pharsight purchased the assets of Metazoa.com for cash of $250,000 and incurred acquisition expenses of $102,000. The assets acquired were as follows (in thousands):

Core technology

$
125Assembled workforce


125Goodwill


102Total

$
352


The
value of the assembled workforce was derived by estimating the costs to replace the existing employees, including recruiting and hiring costs and training costs for each category of
employee. Goodwill is determined based on the residual difference between the amount paid and the values assigned to identified intangible assets. In February 2001, Pharsight began amortizing
goodwill, core technology and assembled workforce on a straight-line basis over the estimated useful lives of these assets of two to three years. These intangible assets were fully
amortized as of March 31, 2002.

5. Concentrations of Credit Risk

Financial instruments that potentially subject Pharsight to concentrations of credit risk consist primarily of cash and cash equivalents, short-term
investments, and trade receivables. Pharsight generally invests its excess cash in money market funds, commercial paper, corporate notes and obligations issued by or fully collateralized by the U.S.
government or federal agencies. Pharsight places its investments with high-credit quality counterparties and, by policy, limits the amount of credit exposure to any one counterparty.

Pharsight
sells primarily to major pharmaceutical and biotechnology companies. Pharsight evaluates its customers' financial condition when necessary and routinely receives a deposit for
services contracts at the time of sale. Pharsight generally requires no collateral from its customers. Pharsight analyzes the need for reserves for potential credit losses and records reserves when
necessary. It maintains an allowance for doubtful accounts based on the expected collectibility of accounts receivable. To date, Pharsight has not experienced any significant losses with respect to
these balances. For the year ended March 31, 2002, Pharsight wrote-off $1,000 against the allowance for doubtful accounts. For the year ended March 31, 2003, there was no
write-off to the allowance for doubtful accounts.

One
customer accounted for 18%, 20% and 11% of total revenues for the year ended March 31, 2003, 2002, and 2001, respectively. Another customer accounted for 10% of total revenues
for the year ended March 31, 2003. A third customer represented 17% of total revenues for the year ended March 31, 2001.

Two
customers comprised 16% and 13% of accounts receivable at March 31, 2003. No customers comprised more than 10% of accounts receivable at March 31, 2002.

50

---

6. Debt

Pharsight has entered into various noncancelable capital lease agreements for equipment and software through a series of sale-leaseback transactions.
Capital lease obligations represent the present value of future rental payments under these leases.

During
the year ended March 31, 2002, Pharsight borrowed $3.5 million from its Silicon Valley Bank term loan. The secured term loan principal is payable over forty-eight
months, beginning in July 2002, interest is accrued at 1.25% above prime and is payable monthly from the date of borrowing. During the year ended March 31, 2002, Pharsight also borrowed
$1 million from its secured revolving credit facility. This secured revolving credit facility expires in June 2003; interest is accrued at 1.00% above prime and is payable monthly from
the date of borrowing.

In
June 2001, Pharsight extended and enhanced the previously unused credit facilities with Silicon Valley Bank. Pharsight had up to $7.5 million available under three
different facilities (less any amounts drawn down). The credit facilities include $2.5 million of secured revolving credit against 80% of eligible domestic accounts receivable,
$1.5 million of secured revolving credit against 90% of eligible foreign accounts receivable and $3.5 million in a term loan secured by certain assets of the Company, excluding
intellectual property. The current secured revolving credit facilities for both domestic and foreign accounts receivable expire in June 2003. Please see Note 15 regarding renewal of these
credit facilities.

During
fiscal 2003, the following financial covenants applied to Pharsight's Silicon Valley Bank loan facilities: quick ratio greater than 1.0; remaining months liquidity of at least six
months (defined as cash used in operating activities for the most recent quarter multiplied by two); liquidity of at least two times the term loan advance; and annual cumulative net loss within 20% of
Pharsight's plan, measured at specific quarterly intervals. On October 23, 2002, Pharsight obtained a modification to its Silicon Valley Bank loan agreement. This modification revised
Pharsight's allowable net losses for the second half of fiscal 2003. Pharsight is in compliance with each of these covenants as of March 31, 2003.

Future
minimum lease payments under notes payable and capital leases at March 31, 2003 are as follows (in thousands):

Notes
Payable

Capital
Leases2004

$
1,875

$
3132005


875


572006


875


2007


219


Total minimum payments


3,844


370Less amounts representing interest





(20
)Present value of minimum lease payments


3,844


350Less current portion


(1,875
)

(295
)Long-term portion

$
1,969

$
55


No
amounts representing interest on the notes payable have been calculated in the above table, as the related interest is variable.

51

---

7. Commitments and Contingencies

Operating Leases

Pharsight leases its office facilities and certain equipment under noncancelable operating leases expiring through 2006. Minimum annual rental commitments,
excluding sublease income and including facilities under restructurings, at March 31, 2003 are as follows (in thousands):

2004

$
8622005


4842006


291Total minimum payments

$
1,637


Sublease
income, excluding sublease income related to a facility under the restructurings, for the year ended March 31, 2003 and 2002, was approximately $309,000 and $939,000,
respectively. These amounts have been reflected as a reduction of operating expenses. Pharsight expects to receive sublease payments of approximately $75,000 in fiscal 2004.

Rent
expense, net of sublease income, was $1,265,000, $1,344,000 and $1,383,000 for the years ended March 31, 2003, 2002, and 2001, respectively.

Legal Claims

From time to time and in the ordinary course of business, the Company may be subject to various claims, charges, and litigation. In the opinion of management,
final judgments from such pending
claims, charges, and litigation, if any, against the Company, would not have a material adverse effect on its financial position, result of operations, or cash flows.

8. Restructuring Charge

During the year ended March 31, 2002, the Company implemented a restructuring program to better align operating expenses with anticipated revenues. The
Company recorded a $676,000 restructuring charge, which consists of $402,000 in facility exit costs, $253,000 in personnel severance costs and $21,000 in other exit costs. The restructuring program
resulted in the reduction in force across all company functions of approximately 14%, or 20 employees. As of March 31, 2002, all 20 employees had been terminated as a result of the program. The
restructuring actions did not impact the resources assigned to develop and support current and future Pharsight Knowledgebase Server, WinNonlin®, WinNonMix® and
Trial Simulator product families. At March 31, 2003, the Company had $16,000 of accrued restructuring costs related to monthly lease expenses for one of the two facilities that
were exited during the year ended March 31, 2002, and other exit costs. The restructuring accrual is included within Accrued Expenses in the balance sheets.

During
the year ended March 31, 2003, the Company announced that it was taking two additional actions intended to help further reduce operating expenses across all
non-core functional areas. These actions were initiated in July 2002 (the "July 2002 Restructuring Plan") and November 2002 (the "November 2002 Restructuring
Plan"). The July 2002 Restructuring Plan included a total reduction of 18 employees, all 18 employees had been terminated as of March 31, 2003. The November 2002 Restructuring
Plan included a total reduction in force of 19 employees and the closure of two remote office locations. As of March 31, 2003, all of the employees had been terminated. In July 2002 and
November 2002, the Company recorded $324,000 and $364,000 in restructuring charges, respectively, representing employee severance costs and facility exit costs. At March 31, 2003, the
Company had $45,000 and $23,000 of remaining accrued restructuring costs associated with the July 2002 Restructuring Plan and the November 2002 Restructuring Plan, respectively. The
accrued costs are related to employee severance to be paid out in the first quarter of fiscal 2004 and monthly lease

52

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expenses
for the two vacated facilities to be paid out in the first and second quarter of fiscal 2004. The restructuring accrual is included within Accrued Expenses in the balance sheets.

The
following table depicts the restructuring activity during the year ended March 31, 2003 (in thousands):

|                                        |  | Expenditures
|--------------------------------------- |  | ------------
|
|December 2001 Restructuring             |  |             
|Vacated facilities and operating assets |  | $           
|Other costs                             |  |             
|July 2002 Restructuring                 |  |             
|Employment related                      |  |             
|November 2002 Restructuring             |  |             
|Employment related                      |  |             
|Vacated Facilities                      |  |             
|                                        |  |             
|Total                                   |  | $           
|                                        |  |             

The
following table depicts the restructuring activity during the year ended March 31, 2002 (in thousands):

|                                        |  | Expenditures
|--------------------------------------- |  | ------------
|
|December 2001 Restructuring             |  |             
|Vacated facilities and operating assets |  | $           
|Employee severance                      |  |             
|Other costs                             |  |             
|                                        |  |             
|Total                                   |  | $           
|                                        |  |             

9. Stockholders' Equity

Series C and Series D Redeemable Convertible Preferred Stock

Prior to the Company's initial public offering in August 2000, the Company had Series C and D redeemable convertible preferred stock outstanding.
Each share of Series C and Series D redeemable convertible preferred stock (Series C stock and Series D stock, respectively) was convertible, at the holder's option, into
one share of common stock subject to certain antidilution adjustments. At conversion, the holders were entitled to any and all declared and unpaid dividends. Each share of preferred stock
automatically converted to common stock upon the closing of Pharsight's initial public offering in August 2000. In addition, each share of Series C preferred stock received in cash the
original issue price of $2.37 upon conversion.

The
Series C stock was redeemable at any time after May 2002 (five years from issuance), upon the affirmative vote of at least 51% of the Series C stockholders. The
Series D stock was redeemable at any time after October 2003 (five years from issuance) upon the affirmative vote of at least 662/3% of the Series D stockholders.
The Series C stock was redeemable at a price of $2.37 per share plus any and all dividends accrued, declared, and unpaid and a payment amount equal to 8% of the original

53

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issue
price of the Series C stock multiplied by the number of full years elapsed between the original issue date and the redemption date. The Series D stock was redeemable at a price of
$3.27 per share, plus any and all dividends accrued and unpaid and a payment amount equal to 8% of the original issue price of the Series D stock multiplied by the number of full years elapsed
between the original issue date and the redemption date.

For
the Series C stock and the Series D stock, Pharsight recorded accretion of the excess redemption value ratably against earnings over the term of the redemption feature.
The accretion resulted in a $174,000 and $489,000 increase to the carrying value of the Series C stock for the years ended March 31, 2001and 2000, respectively. The accretion resulted in
a $269,000 and $752,000 increase in the carrying value of the Series D stock for the years ended March 31, 2001, and 2000, respectively.

Preferred Stock

In August 2000, upon completion of the Company's initial public offering, all outstanding preferred stocks converted to common stock.

As
of March 31, 2003 Pharsight is authorized to issue up to 5,000,000 shares of preferred stock. The Board of Directors designated 2,000,000 shares as Series A preferred
stock and 1,200,000 shares as Series B preferred stock. The Board of Directors may determine the rights and preferences of the remaining 1,800,000 shares of preferred stock, subject to
limitations provided pursuant to the terms of the Series A and Series B preferred stock.

Series A Redeemable Convertible Preferred Stock and Common Stock Warrants

On June 26, 2002 and September 11, 2002, the Company completed a private placement of 1,814,662 units (each a "Unit," and, collectively, the
"Units") for an aggregate purchase price of $7.5 million to certain entities affiliated with the Company's existing stockholders. The sale and issuance of the Units were made pursuant to a
Preferred Stock and Warrant Purchase Agreement (the "Purchase Agreement") and closed in two phases. The first phase was completed on June 26, 2002, pursuant to which the Company sold an
aggregate of 761,920 Units for an aggregate purchase price of $3.15 million. The second phase was completed on September 11, 2002, pursuant to which the Company sold an aggregate of
1,052,742 Units for an aggregate purchase price of $4.35 million. Each Unit consists of one share of the Company's Series A redeemable convertible preferred stock (the "Series A
Preferred") and a warrant to purchase one share of common stock (each a "Warrant," and, collectively, the "Warrants").

Dividends

The holders of the Series A Preferred shall be entitled to receive cumulative dividends in preference to any dividend on the common stock, payable
quarterly at the rate of 8% per annum, at the election of the holder either in cash or in shares of Series B redeemable convertible preferred stock (the "Series B Preferred" and,
together with the Series A Preferred, the "Preferred Stock"). The Series B Preferred has identical rights, preferences and privileges as the Series A Preferred, except that the
Series B Preferred is not entitled to the dividend payment right.

Conversion

The holders of the Preferred Stock shall have the right to convert the Preferred Stock, at any time, into shares of common stock. The initial conversion rate
shall be four to one, subject to proportional adjustments for stock splits, stock dividends, recapitalizations and the like.

54

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The
Preferred Stock shall be automatically converted into common stock, at the then applicable conversion price, (i) in the event that the holders of at least 75% of the
outstanding Preferred Stock consent to such conversion or (ii) upon the closing of a firmly underwritten public offering of shares of common stock of the Company for a public offering price of
at least $3.006 per share and with gross proceeds to the Company of not less than $40,000,000 (before deduction of underwriters commissions and expenses).

Liquidation Preference

In the event of any liquidation or winding up of the Company, the holders of the Preferred Stock shall be entitled to receive in preference to the holders of the
common stock a per share amount equal to the greater of (a) the original issue price, plus any accrued but unpaid dividends and (b) the amount that such shares would receive if converted
to common stock immediately prior thereto (the "Liquidation Preference"). After the payment of the Liquidation Preference to the holders of the Preferred Stock, the remaining assets shall be
distributed ratably to the holders of the common stock. A merger, acquisition, sale of voting control of the Company in which the stockholders of the Company do not own a majority of the outstanding
shares of the surviving corporation, or a sale of all or substantially all of the assets of the Company, shall be deemed to be a liquidation.

Voting Rights

The holders of Preferred Stock are entitled to vote together with the common stock. Each share of Preferred Stock shall have a number of votes equal to the number
of shares of common stock then issuable upon conversion of such share of Preferred Stock. In addition, consent of the holders of at least 75% of the then outstanding Preferred Stock shall be required
for certain actions, including any action that amends the Company's charter documents so as to adversely affect the Preferred Stock.

Redemption

At the election of the holders of at least 75% of the Preferred Stock, to the extent that the Company may legally do so, the Company shall redeem the outstanding
Preferred Stock after the fifth anniversary of the initial issuance of Preferred Stock. Such redemption shall be at a price of $4.008 per share plus accrued and unpaid dividends. If the holders of
Preferred Stock shall not have elected to have the Company redeem the Preferred Stock at or after the fifth anniversary of the date of issuance, the Company shall have the option to redeem the
Preferred Stock on the same terms as the optional redemption by the holders of Preferred Stock.

Registration Rights

Pursuant to the Purchase Agreement, within 55 days following the initial closing, the Company agreed to use its best efforts to prepare and file a
registration statement on Form S-3 (the "Registration Statement") for the resale of the shares of common stock issuable to the purchasers upon conversion of the Preferred Stock and
exercise of the Warrants (the "Shares"), and to use its commercially reasonable efforts to cause the Registration Statement to become effective within 105 days after the initial closing.

The
Company caused the Registration statement to be declared effective on October 31, 2002. In the event that the Company shall fail to keep the Registration Statement effective
(other than pursuant to the permissible suspension periods or waivers granted by the holders of the Preferred Stock), the Company shall pay to the holders of Preferred Stock as liquidated damages the
amount of 1% per month of the aggregate purchase price for the Shares remaining to be sold pursuant to the Registration Statement.

55

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Warrants

The Warrants are exercisable for a period of five years from the date of issuance at a per share price equal to $1.15, subject to proportional adjustments for
stock splits, stock dividends, recapitalizations and the like. If not exercised after five years, the right to purchase the common stock will terminate. The Warrants contain a cashless exercise
feature. The common stock issuable upon exercise of the Warrants are entitled to the benefits and subject to the terms of the Registration Rights described above.

Summary of Certain Preferred Stock and Warrant Accounting

Due to the nature of the redemption features of the Series A Preferred, the Company excluded the Series A Preferred from stockholders' equity in its
financial statements.

The
amount representing the Series A Preferred with total gross proceeds of $7.5 million was discounted by a total of $2.1 million, including $1.3 million
representing the value assigned to the Warrants, $585,000 representing the related beneficial conversion feature of the Series A Preferred, and $268,000 representing issuance costs. The
$1.3 million value of the Warrants is subject to accretion over the 5-year redemption period. After reducing the proceeds by the value of the Warrants, the remaining proceeds are
used to compute a discounted conversion price in accordance with EITF 00-27, "Application of EITF Issue No. 98-5, Accounting for Convertible Securities with Beneficial
Conversion Features or Contingently Adjustable Conversion Ratios to Certain Convertible Instruments". The discounted conversion price for each of the two closings is compared to the fair market value
of the Company's common stock on June 26, 2002 (the date of issuance of the Series A Preferred) and September 6, 2002 (the date of the shareholder vote approving the second
closing) resulting in a total beneficial conversion feature of $585,000, which represents the difference between the fair market value of the Company's common stock and the discounted conversion
price. The beneficial conversion feature of $585,000 is subject to accretion over the 5-year redemption period. Issuance costs of $268,000 were accounted for as a discount on the
redeemable Preferred Stock and are also subject to accretion over the 5-year redemption period.

The
net discounted value for the Series A Preferred of $5.6 million is recorded as a long-term liability as of March 31, 2003 with the corresponding
aggregate value of the Warrants and the beneficial conversion feature of $1.9 million ($1.3 million plus $585,000) recorded as
additional-paid-in-capital within equity.

Deemed
dividends were recorded by the Company for the year ended March 31, 2003 totaling approximately $246,000, in aggregate representing accretion of the discount resulting from
the value of Warrants, the value of the beneficial conversion feature and the issuance costs. The aggregate deemed dividends recorded were charged against
additional-paid-in-capital and included in the calculation of net loss applicable to common stockholders.

Dividends
on the Preferred Stock, calculated at the rate of 8% per annum, were approximately $375,000 for the year ended March 31, 2003. The dividends were charged against
additional-paid-in-capital and included in the calculation of net loss applicable to common stockholders.

56

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Common Stock

Pharsight is authorized to issue up to 120,000,000 shares of common stock. At March 31, 2003, common stock was reserved for future issuance as follows (in
thousands):

Warrants outstanding

2,091Stock option plans

7,214Employee stock purchase plan

1,071Redeemable convertible preferred stock

7,25917,635


Pharsight
has sold common stock pursuant to restricted stock purchase agreements containing provisions established by the Board of Directors. Pharsight has a right to repurchase the
shares at the original sale price, which generally expires at the rate of 25% after one year and 2.0833% per month thereafter.

For
the year ended March 31, 2000, Pharsight sold 2,981,000 restricted shares. For the year ended March 31, 1999, Pharsight sold 2,169,000 restricted shares. At
March 31, 2003 and 2002, 11,000 and 76,000 shares were subject to repurchase.

Notes Receivables from Stockholders

Pharsight loaned an officer $12,000 in July 1996 and $10,000 in June 1998 in connection with the purchase of common stock. Interest on each of these
loans was 6.74% and 5.77% per year, respectively, and compounds annually. The principal and accrued interest on each of these was due in July 2001 and June 2003, respectively, and could
be prepaid without penalty. The promissory notes become due and payable 30 days after the officer's employment was terminated. In addition, Pharsight loaned the officer $23,000 in
July 1999 to purchase additional shares of common stock. The interest on this loan was 6% per year, with the principal and accrued interest due in May 2003. The officer was on leave from
Pharsight from October 2001 to October 2002, and officially left the company in October 2002. These notes were written off in fiscal 2002.

In
January 1998 Pharsight loaned an officer $75,000 in connection with the purchase of common stock. The interest on this loan was 5.93% per year and compounds annually. The
principal and accrued interest was due in December 2002 and could be prepaid without penalty. The note was full recourse and the shares of common stock purchased were pledged as repayment of
the loans. This loan was paid in full in December 2002.

Warrants

In connection with various convertible promissory notes and loan agreements entered into throughout fiscal 1999, Pharsight issued warrants to purchase 272,000
shares of common stock at exercise prices ranging from $0.25$3.27 per share. The fair value assigned to these warrants was immaterial. As of March 31, 2003, all of these warrants
remained outstanding. The warrants expire on August 9, 2005.

In
connection with certain equipment leases, Pharsight issued a warrant to purchase 4,000 shares of common stock at an exercise price of $7.20 per share in fiscal 2001. The fair value
assigned to these warrants was immaterial. At March 31, 2003, all of these warrants remained outstanding. The warrants expire on August 2005.

57

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The
following table depicts warrant activity (in thousands) for the three years ended March 31, 2003.

Number of
Warrants
OutstandingBalance at March 31, 2000

272Warrants granted

4Balance at March 31, 2001

276Warrants granted

Balance at March 31, 2002

276Warrants granted

1,815Balance at March 31, 2003

2,091


10.   Stock-Based Benefit Plans

Stock Option Plans

In April 2000, the Board of Directors adopted and in May 2000, the stockholders approved, the 2000 Equity Incentive Plan ("Incentive Plan"). The
Incentive Plan became effective upon Pharsight's initial public offering in August 2000. The Incentive Plan provides for the granting of stock awards, including incentive stock options,
nonstatutory stock options, stock bonuses and rights to acquire restricted stock, to Pharsight's employees and consultants. In addition, the Incentive Plan provides for non-discretionary
grants of nonstatutory stock options to Pharsight's non-employee directors.

Under
the Incentive Plan, the Board of Directors determines the term of each award and the award price. In the case of incentive stock options, the exercise price may not be less than
the fair market value on the date of grant, while nonstatutory options and restricted stock awards have exercise prices of not less than 85% of fair market value on the date of grant. Stock bonuses
may be granted with a zero exercise price in consideration of past services rendered. In general, stock options vest over a
four-year period, 25% on the first anniversary of the grant and ratably on a monthly basis thereafter.

Non-employee
directors are eligible to receive nonstatutory stock options with an exercise price equal to fair market value on the date of grant under the Incentive Plan.
Each eligible director received an option to purchase 5,000 shares of common stock on the date of Pharsight's initial public offering. In addition, each newly elected director will be granted an
option to purchase 5,000 shares of common stock on the date of his election (2,500 shares if he is elected more than six months after the previous Annual Meeting of Stockholders). Each eligible
director is also granted an additional option to purchase 5,000 shares of common stock on the day after each Annual Meeting of Stockholders, beginning in 2001. Options granted to
non-employee directors generally vest on the date of the Annual Meeting immediately following the grant and have a maximum term of 10 years.

Pharsight
initially reserved 4,000,000 shares for grant under the Incentive Plan. On each January 1, the number of shares reserved will increase automatically by the least of 5%
of the total number of common shares outstanding on that date, 2,000,000 shares or such fewer number of shares as determined by the Board of Directors. On January 1, 2002, an additional 932,000
shares were reserved for issuance under the Incentive Plan. The number of shares reserved for issuance did not change on January 1, 2003.

In
April 2001, the Board of Directors approved the UK Company Share Option Plan ("UK Plan"). The UK Plan became effective upon approval of its terms by the Inland Revenue of the
United Kingdom ("Inland Revenue"). The UK Plan provides for the granting of stock options to Eligible

58

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Employees
(as defined in the UK Plan). Pharsight has reserved 200,000 shares for grant under the UK Plan.

Under
the UK Plan, the Board of Directors determines the term of each award and the award price (subject to the approval of Inland Revenue). The exercise price of all options may not be
less than the fair market value on the date of the grant. In general, stock options vest over a four-year period, 25% on the first anniversary of the grant and ratably on a monthly basis.

Under
the UK Plan, any option granted to an Eligible Employee shall be limited and take effect so that, immediately following such grant, the aggregate Market Value of all the shares
which he may acquire on the exercise in full of all unexercised options then held by him under the UK Plan and any share option plan (other than a savings-related share option plan) approved by the
Inland Revenue under Schedule 9 and adopted by the Company or any Associated Company (as defined in the Plan) of
the Company, shall not exceed 30,000 English Pounds. There have been no shares issued under the UK Plan.

Pharsight
has two predecessor plans to the Incentive Plan, the 1997 Stock Option Plan ("1997 Plan") and the 1995 Stock Option Plan ("1995 Plan"). The 1997 Plan and the 1995 Plan were
terminated upon the effective date of the Incentive Plan. Options outstanding under the 1997 Plan and 1995 Plan remain outstanding and may be exercised until they expire or are otherwise cancelled. No
new options may be granted under these Plans. Options outstanding under the 1997 Plan and 1995 Plan have terms and vesting periods substantially the same as options outstanding under the Incentive
Plan.

In
May 2000, the Board of Directors adopted the 2000 CEO Non-Qualified Stock Option Plan ("CEO Plan"). The sole person eligible to receive an option under the CEO Plan
was Pharsight's former Chief Executive Officer, who received an option to purchase all 443,000 shares reserved for issuance under the CEO Plan. The exercise price of the options was $6.83, which was
105% of the fair market value on the date of grant. The options vest in equal monthly installments over 34 months. In certain change in control circumstances, a surviving or acquiring
corporation may either assume all outstanding options under the CEO Plan or substitute other awards for the outstanding options. If the surviving or acquiring corporation does not assume or substitute
other awards for the options outstanding under the CEO Plan, then the vesting will accelerate and the options will terminate prior to the change in control if they are not otherwise exercised. At
March 31, 2003, 287,000 options remained outstanding under the CEO Plan, and 156,000 options had been cancelled.

59

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A
summary of Pharsight's stock option activity and related information for the three years, in the period ended March 31, 2002, is as follows (in thousands, except per share
amounts):

Number of
Options
Outstanding

Weighted
Average
Exercise Price
per ShareBalance at March 31, 2000

1,835

$
1.06Options granted

2,470


5.70Options exercised

(521
)

0.96Options canceled

(243
)

3.87Balance at March 31, 2001

3,541


4.09Options granted

2,121


1.89Options exercised

(298
)

0.57Options canceled

(912
)

3.79Balance at March 31, 2002

4,452


3.34Options granted

668


0.80Options exercised

(77
)

0.26Options canceled

(1,930
)

3.26Balance at March 31, 2003

3,113

$
2.91


At
March 31, 2003, 2002, and 2001, 4,101,000, 3,443,000 and 4,061,000 shares were available for future option grants, respectively.

The
following table summarizes information about stock options outstanding and exercisable at March 31, 2003 (in thousands, except per share amounts):

|                |  | Options Outstanding |  | Options Exercisable
|--------------- |  | ------------------- |  | -------------------
|
|$0.10 - $  0.80 |  | 535                 |  | 7.61               
|$0.82 - $  1.05 |  | 531                 |  | 9.06               
|$1.25 - $  1.80 |  | 617                 |  | 8.45               
|$1.95 - $  3.75 |  | 523                 |  | 8.22               
|$3.88 - $10.00  |  | 907                 |  | 7.15               
|                |  |                     |  |                    
|$0.10 - $10.00  |  | 3,113               |  | 7.99               
|                |  |                     |  |                    

At
March 31, 2002 and 2001, options to purchase 1,395,000 and 1,141,000 shares were exercisable, respectively.

Employee Stock Purchase Plan

In April 2000, the Board of Directors adopted and in May 2000, the stockholders approved, the 2000 Employee Stock Purchase Plan ("Purchase Plan").
The Purchase Plan became effective upon Pharsight's initial public offering in August 2000.

Pharsight
has reserved 600,000 shares for issuance under the Purchase Plan. Each January 1, the number of shares reserved will be increased automatically by the least of 1.5% of
the number of shares of common stock outstanding on that date, 600,000 shares or a fewer number as determined by the Board of Directors. On January 1, 2002 the number of shares reserved under
the Purchase Plan

60

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increased
by 280,000. The number of shares reserved did not change on January 1, 2003. Eligible employees may purchase common stock through payroll deductions by electing to have up to 20% of
their compensation withheld. Each participant is granted an option to purchase common stock on the first day of each six-month offering period and this option is automatically exercised on
the last day of the offering period. The purchase price for the common stock under the Purchase Plan is 85% of the lesser of the fair market value of the common stock on the first day and the last day
of the offering period. Offering periods begin on February 1 and August 1 of each year. Shares of common stock issued under the Purchase Plan totaled 54,000 and 79,000 in 2003 and 2002,
respectively. As of March 31, 2003, 941,000 shares remain available for future issuance.

In
April 2001, the Board of Directors adopted the 2001 UK Employee Stock Purchase Plan ("UK Purchase Plan"). The UK Purchase Plan became effective immediately. Pharsight has
reserved 130,000 shares for issuance under the UK Purchase Plan. Each January 1, the number of shares reserved will be increased automatically by the least of 1.5% of the number of shares of
common stock outstanding on that date, 130,000 shares or a fewer number as determined by the Board of Directors. On January 1, 2003 and 2002, the number of shares reserved under the UK Purchase
Plan did not increase. Eligible employees may purchase common stock through payroll deductions by electing to have up to 20% of their compensation withheld. Each participant is granted an option to
purchase common stock on the first day of each six-month offering period and this option is automatically exercised on the last day of the offering period. The purchase price for the
common stock under the UK Purchase
Plan is 85% of the lesser of the fair market value of the common stock on the first day and the last day of the offering period. Offering periods begin on February 1 and August 1 of each
year. There were no shares of common stock issued under the UK Purchase Plan in 2003 and 2002. As of March 31, 2003, 130,000 shares remain available for future issuance.

The
weighted average grant date fair value of stock options, as calculated using the Black Scholes model under FAS 123, was as follows:

ESPP
Years Ended March 31,

Options
Years Ended March 31,2003

2002

2001

2003

2002

2001Weighted average fair value

$
1.69

$
1.42

$
2.21

$
0.74

$
1.53

$
3.47


Deferred Compensation

During the years ended March 31, 2001 and 2000, Pharsight recorded aggregate deferred compensation of $10,070,000 and $5,400,000, respectively,
representing the difference between the exercise price of stock options granted and the then deemed fair value of Pharsight's common stock. The amortization of deferred compensation is charged to
operations over the vesting period of the options using the graded method for employee options, and the straight-line method for non-employee options. During the year ended
March 31, 2002, Pharsight recorded deferred stock compensation of $114,000 representing the intrinsic value of a certain stock award issued to an officer as a bonus. Pharsight amortized
$1,322,000, $2,993,000 and $7,552,000 of deferred compensation for the years ended March 31, 2003, 2002, and 2001.

The
amount of deferred stock compensation to be amortized in future periods, ending March 31, is as follows (in thousands):

2004

$
3202005

$
32


61

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Options Issued to Consultants and Scientific Advisory Board Members

During fiscal 2003, Pharsight granted additional options to purchase 5,000 shares of common stock to members of the Scientific Advisory Board at an exercise price
of $1.67. These options were fully vested at the date of grant and are exercisable for 10 years. Pharsight valued these options at $7,800 using the Black-Scholes valuation model assuming fair
value of the common stock being $1.67 per share, a risk-free interest rate of 1.65%, a volatility factor of 127% and a life of 10 years. Pharsight recorded the fair value of these
options as a charge to operations for the year ended March 31, 2003.

During
the year ended March 31, 2002, Pharsight granted options to purchase 30,000 shares of common stock to consultants at an exercise price of $0.99 in exchange for services.
The option was fully vested at the date of grant and is exercisable for two years. Pharsight valued these options at $20,000, being their fair value estimated using the Black-Scholes valuation model
with the following assumptions: a risk-free interest rate of 6.00%, a volatility factor of 138.0% and lives of 2 years. Pharsight recorded the fair value of these options as a
charge to operations for the year ended March 31, 2002.

During
fiscal 2001, Pharsight granted additional options to purchase 23,000 shares of common stock to consultants and members of the Scientific Advisory Board at exercise prices ranging
from $3.00 to $3.88. 11,000 and 20,000 of these options had vested as of March 31, 2003 and 2002, respectively. Pharsight valued these options at $50,000, being their fair value estimate using
the Black-Scholes valuation model assuming fair values of common stock ranging from $3.00 to $4.00 per share, a risk-free interest rate of 6.00%, a volatility factor of 80.0% and lives
ranging from 5 to 7 years. Pharsight recorded the fair value of these options as a charge to operations for the year ended March 31, 2001. The fair value assigned to these warrants in
fiscal 2003 was immaterial.

As
of March 31, 2000, Pharsight had granted options to purchase 32,000 shares of common stock to consultants and members of the Scientific Advisory Board at exercise prices
ranging from $0.35 to $4.35 per share. The options were granted in exchange for consulting and advisory services to be rendered and vest over four to five years. Pharsight valued these options at
$275,000, being their fair value estimated using the Black-Scholes valuation model assuming fair values of common stock ranging from $2.94 to $10.40 per share, a risk-free interest rate of
6.25%, a volatility factor of 50% and a life of 10 years. The value of these options is being amortized over the vesting period. The fair value assigned to these warrants in fiscal 2003 was
immaterial.

Accelerated Vesting of Stock Options

During fiscal year 2002 the Company accelerated the vesting of stock options of certain terminated employees and a former board member and recorded a compensation
charge of $35,000 relating to the re-measurement of these options as of the date of the modification.

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11.   Income Taxes

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes
and the amounts used for income tax purposes. Significant components of the Company's deferred tax assets are as follows (in thousands):

March 31,2003

2002Deferred tax assets:Net operating loss carryforwards

$
20,900

$
18,100Research and development tax credits


1,100


900Capitalized research and development


900


900Amortization of intangible assets


100


100Other


1,000


600Total deferred tax assets


24,000


20,600Valuation allowance


(24,000
)

(20,600
)Net deferred tax assets

$


$



Realization
of deferred tax assets is dependent upon future earnings, if any, the timing and amount of which are uncertain. Accordingly, the net deferred tax assets have been fully
offset by a valuation allowance. The valuation allowance for deferred tax assets increased by approximately, $3,400,000, $7,300,000, and $4,800,000 in the year ended March 31, 2003, 2002, and
2001, respectively.

As
of March 31, 2003, the Company had net operating loss carryforwards for federal and state income tax purposes of approximately $58,000,000 and $19,000,000 respectively, which
begin to expire in the years 2005 through 2023.

The
Company had federal and state research and development tax credits of approximately $800,000 and $500,000 respectively. The federal research and development credits begin to expire
in 2011 through 2023 and the state credits carryforward indefinitely.

Utilization
of the Company's net operating loss and credits may be subject to substantial annual limitation due to the ownership change limitations provided by the Internal Revenue Code
and similar state provisions. Such an annual limitation could result in the expiration of the net operating loss and credits before utilization.

12.   Segment Information

Pharsight's revenue base is derived from the sale of software licenses and consulting services to pharmaceutical companies on a worldwide basis. Pharsight
operates solely in one operating segment, the sale of licenses and consulting services to pharmaceutical companies. Additionally, the chief operating decision maker evaluates resource allocation not
on a product or geographic basis, but rather on an enterprise wide basis. Therefore, Pharsight has concluded that it contains only one reportable segment.

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Revenues
from sales to customers by major geographic area for the years ended March 31 were (in thousands):

Years Ended March 31,2003

2002

2001United States

$
10,797

$
9,092

$
8,183Europe


2,735


4,574


3,219Other


436


583


546$
13,968

$
14,249

$
11,948


No
foreign country accounted for 10% or more of the Pharsight's total revenues in the years ended March 31, 2003, 2002, and 2001. All of the Pharsight's significant
long-lived assets are located within the United States.

13.   401(k) Plan

Pharsight has a 401(k) plan, which covers all employees. Pharsight's contributions to the plan are discretionary. Through March 31, 2003, Pharsight has
made no contributions to the plan.

14.   Warranties

The Company generally provides a warranty for its software products and services to its customers for a period of 90 days and accounts for its warranties
under the FASB's Statement of Financial Accounting Standards No. 5, "Accounting for Contingencies." The Company's software products' media are generally warranted to be free of defects in
materials and workmanship under normal use and the products are also generally warranted to substantially perform as described in certain Company documentation. The Company also provides for a limited
performance warranty for its software products for a period of 90 days from the date of installation at the customer premises, if used as permitted under the signed agreement and in accordance
with the Company documentation. The sole remedy that the Company provides is that it will, at its own expense, use commercially reasonable efforts to correct any reproducible error in the software
during the warranty period, and if it determines that it is unable to correct the error, the Company will refund the license fee paid for the nonconforming component of the licensed software. The
Company's services are generally warranted to be performed in a professional manner and to materially conform to the specifications set forth in a customer's signed contract. In the event there is a
failure of such warranties, the Company generally will correct or provide a reasonable work around or replacement product. The Company has not provided for a warranty accrual in all periods presented.
To date, the Company's product warranty expense has not been significant.

The
Company generally agrees to indemnify its customers against legal claims that the Company's PKS software product infringes certain third-party intellectual property rights and
accounts for its indemnification obligation under FAS 5. In the event of such a claim, the Company is obligated to pay those costs and damages finally awarded against customer in any such action that
are specifically attributable to such claim, or those costs and damages agreed to in a monetary settlement of such action. In addition, in the event of an infringement, the Company agrees to modify or
replace the infringing product, or, if those options are not reasonably possible, in general, to refund the cost of the software paid to date upon the customer's return of the software product. To
date, the Company has not been required to make any payment resulting from infringement claims asserted against its customers. As such, the Company has not recorded a liability for infringement costs
in all periods presented.

64

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15.   Subsequent Events

In May 2003, Pharsight extended its secured revolving credit facility agreement with Silicon Valley Bank for an additional year. Pharsight has
$2.0 million available under two accounts receivable facilities. These include $1.4 million of secured revolving credit against 80% of eligible domestic accounts receivable and $600,000
of secured revolving credit against 90% of eligible foreign accounts receivable. Pharsight continues to have $1.0 million of the accounts receivable facility utilized. The following financial
covenants apply to the extended Silicon Valley Bank loan facilities: remaining months liquidity of at least six months (defined as cash used in operating activities for the most recent quarter
multiplied by two); liquidity of at least two times the term loan advance; and cumulative fiscal year-to-date net loss within 20% of the Company's plan, measured monthly.

65

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

Not Applicable.

PART III

ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

Information concerning our directors will be contained under the caption "Proposal 1Election of Directors" in our definitive Proxy Statement
(our "Proxy Statement") with respect to our Annual Meeting of Stockholders, to be held on August 14, 2003, and is incorporated by reference into this report. Information concerning our
Executive Officers is set forth in Item 1 under the caption "Executive Officers of the Registrant." Information concerning compliance with Section 16(a) of the Securities Exchange Act of
1934 is incorporated by reference to the section entitled "Section 16(a) Beneficial Ownership Reporting Compliance" contained in our Proxy Statement.

ITEM 11. EXECUTIVE COMPENSATION

The information required under this item is incorporated by reference from our definitive proxy statement to be filed with respect to the 2003 Annual Meeting of
Stockholders.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

The information required under this item, other than as set forth in this item below, is incorporated by reference from our definitive proxy statement to be filed
with respect to the 2003 Annual Meeting of Stockholders.

EQUITY COMPENSATION PLAN INFORMATION

The following table sets forth the number of shares subject to grants under, and available for grant under, our equity compensation plans as of March 31,
2003:

|Plan Category                                                 |       | Number of securities
to be issued
upon exercise of
outstanding options,
warrants and rights(a) |           | Weighted-average
exercise price of
outstanding options,
warrants and rights(b) |      | Number of securities
remaining available
for issuance under
equity compensation
plans (excluding
securities reflected
in column (a))(c)
|------------------------------------------------------------- | ----- | ---------------------------------------------------------------------------------------------- | --------- | ------------------------------------------------------------------------------ | ---- | ---------------------------------------------------------------------------------------------------------------------------------------
|Equity compensation plans approved by security holders(1)     |       | 4,905,857                                                                                      |           | $                                                                              | 1.98 |                                                                                                                                        
|Equity compensation plans not approved by security holders(2) |       | 317,360                                                                                        |           |                                                                                | 6.32 |                                                                                                                                        
|                                                              |       |                                                                                                |           |                                                                                |      |                                                                                                                                        
|                                                              | Total |                                                                                                | 5,223,217 |                                                                                | $    | 2.24                                                                                                                                   
|                                                              |       |                                                                                                |           |                                                                                |      |                                                                                                                                        

---

The
following is a description of our equity incentive plans not approved by our stockholders:

2000 CEO Non-Qualified Stock Option Plan

Our Board of Directors adopted the 2000 CEO Non-Qualified Stock Option Plan on May 15, 2000. The sole person eligible to receive an option
under the option plan is Arthur H. Reidel, our

66

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former
Chief Executive Officer. Mr. Reidel received an option to purchase all 442,750 shares authorized for issuance under the option plan. The exercise price of options issued under the option
plan is $6.83, which was 105% of the fair market value of our Common Stock on the date of grant as determined by our Board. The option vests in equal monthly installments over 34 months. In
certain change in control circumstances, a surviving or acquiring corporation may either assume all outstanding awards under the option plan or substitute other awards for the outstanding awards. If
the surviving or acquiring corporation does not assume or substitute outstanding option, then the vesting will accelerate and the options will terminate prior to the event if not otherwise exercised.

2001 UK Employee Stock Purchase Plan

Our Board of Directors adopted the 2001 UK Employee Stock Purchase Plan on April 24, 2001. We have authorized the issuance of 130,000 shares of our Common
Stock pursuant to purchase rights granted under the plan. As of March 31, 2003, no shares have been issued pursuant to the purchase plan and 130,000 shares remain available for grant. On each
January 1, starting with January 2002, the
share reserve will automatically be increased by a number of shares equal to the lesser of: 1.5% of our then outstanding shares of common stock; 130,000 shares; or such fewer number of shares
determined by the Board.

Eligibility.The purchase plan provides a means by which eligible employees may purchase our Common Stock through payroll
deductions. We implement the purchase plan by offerings of purchase rights to eligible employees. Generally, all of our employees located in the United Kingdom who are not officers or directors may
participate in offerings under the purchase plan. However, no employee may participate in the purchase plan if, immediately after we grant the employee a purchase right, the employee would have voting
power over 5% or more of out outstanding capital stock.

Administration.Under the purchase plan, the Board may specify offerings of up to 27 months. Unless the Board
otherwise determines, Common Stock will be purchased for accounts of participating employees at a price per share equal to the lower of: 85% of the fair market value of a share on the first day of the
offering; or 85% of the fair market value of a share on the purchase date.

If
authorized by the Board, participating employees may authorize payroll deductions of up to 20% of their base compensation for the purchase of stock under the purchase plan. Generally,
employees may end their participation in the offering at any time. Their participation ends automatically on termination of their employment.

Other Provisions.The Board may grant eligible employees purchase rights under the purchase plan only if the purchase rights,
together with any other purchase rights granted under other employee stock purchase plans established by us or by our affiliates, if any, do not permit the employee's rights to purchase our stock to
accrue at a rate which exceeds $25,000 of fair market value of our stock for each calendar year in which the purchase rights are outstanding.

Upon
the happening of certain corporate transactions, a surviving corporation may assume outstanding purchase rights or substitute other purchase rights therefore. Otherwise, the rights
may continue in full force and effect, or the participant's accumulated payroll deductions may be used to purchase Common Stock immediately prior to the transaction and the participant's rights under
the offering terminate.

UK Company Share Option Plan

Our Board of Directors initially adopted our UK Company Share Option Plan on April 24, 2001. We have reserved a total of 200,000 shares of our Common Stock
for issuance under the UK Company Share Option Plan. As of March 31, 2003, under the UK Company Share Option Plan (a) options to purchase 30,875 shares of common stock were outstanding
and (b) no options have been exercised. The UK Company Share Option Plan provides that it will be administered by the Board, or a committee

67

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appointed
by the Board, which determines recipients and types of options to be granted, including number of shares under the option and the exercisability of the shares.

Transactions
not involving our receipt of consideration, such as a capitalization, consolidation, subdivision or reduction of share capital, may change the class and number of shares
subject to the option plan and to outstanding options. The Board will adjust outstanding options as to the class, number of shares and price per share applicable to such options.

In
the event of a change of control (as defined in section 840 of the United Kingdom's Income and Corporation Taxes Act of 1988), all outstanding options shall be accelerated in
full. Pursuant to agreement between an option holder and the surviving entity, outstanding options may be substituted for by the surviving entity. The vesting and exercisability of all other options
will terminate the earlier of the end of the option period or six months from the time when the corporate transaction occurs.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

The information required under this item is incorporated by reference from our definitive proxy statement to be filed with respect to the 2003 Annual Meeting of
Stockholders.

ITEM 14. CONTROLS AND PROCEDURES

Limitations on the Effectiveness of Controls.Our management, including the Chief Executive Officer and Chief Financial
Officer, does not expect that our disclosure controls and procedures or our internal
controls will provide absolute assurance that all errors will be detected. A control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the
objectives of the control system are met. Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues and instances of
fraud, if any, within Pharsight have been detected. These inherent limitations include the realities that judgments in decision-making can be faulty, and that breakdowns can occur because of simple
error or mistake. Additionally, controls can be circumvented by the individual acts of some persons, by collusion of two or more people, or by management override of the control. The design of any
system of controls also is based in part upon certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under
all potential future conditions. Over time, control may become inadequate because of changes in conditions, or the degree of compliance with the policies or procedures may deteriorate. Because of the
inherent limitations in a cost-effective control system, misstatements due to error or fraud may occur and not be detected.

Evaluation of Disclosure Controls and Procedures.As of March 31, 2003, an evaluation was performed under the
supervision and with the participation of our management, including our Chief Executive Officer, Shawn O'Connor, and our Chief Financial Officer, Charles Faas, of the effectiveness of the design and
operation of our disclosure controls and procedures. Based on that evaluation, our management, including Mr. O'Connor and Mr. Faas, concluded that our disclosure controls and procedures
were effective as of March 31, 2003. There have been no significant changes in internal controls or, to our knowledge, in other factors that could significantly affect these controls subsequent
to March 31, 2003.

Non-Audit Services.Consistent with Section 10A(i)(2) of the Securities Exchange Act of 1934, as added by
Section 202 of the Sarbanes-Oxley Act of 2002, we are responsible for listing the non-audit services approved by our Audit Committee to be performed by Ernst & Young LLP, our
independent auditor. Non-audit services are defined as services other than those provided in connection with an audit or a review of our financial statements. The only
non-audit services approved by our Audit Committee to be performed by Ernst & Young LLP are the preparation of tax returns, and tax advice in preparing for and in connection
with such filings.

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PART IV

ITEM 15. EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K

Reference
is made to page 32 under "Item 8 Financial Statements and Supplementary Data" for a list of all financial statements and schedules filed as a part of this report.



Schedule IIValuation
and Qualifying Accounts



The
exhibits listed under Item 16(c) hereof are filed as part of this Annual Report on Form 10-K.

No
reports on Form 8-K were filed during the fourth quarter of the year ended March 31, 2003.

The
following exhibits are filed with this report:

|Exhibit
Number |  | Description Of Document                                                                                                                                        
|-------------- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------
|3.2(6)         |  | Amended and Restated Certificate of Incorporation of Pharsight.                                                                                                
|3.3*           |  | Bylaws of Pharsight.                                                                                                                                           
|3.4(6)         |  | Certificate of Designations of Series A and Series B Convertible Preferred Stock of Pharsight Corporation.                                                     
|4.1            |  | Reference is made to Exhibits 3.2, 3.3, and 3.4.                                                                                                               
|4.2*           |  | Amended and Restated Investors' Rights Agreement, dated as of September 2, 1999, by and among Pharsight and the investors listed on Exhibit A attached thereto.
|4.3            |  | Reference is made to Exhibits 10.31 and 10.32.                                                                                                                 
|10.1*          |  | Asset Purchase Agreement dated as of May 27, 1998, by and among Pharsight, Mitchell and Gauthier Associates, Inc., Edward E.L. Mitchell and Joseph S. Gauthier.
|10.2*          |  | Lease on Suite 200 at 800 El Camino Real West, Mountain View, California, by and among Pharsight and Asset Growth Partners, dated as of June 11, 1998.         
|10.3*          |  | Co-Ownership Agreement, dated as of the May 27, 1998, by and between Pharsight and Mitchell and Gauthier Associates, Inc.                                      
|10.4*          |  | Noncompetition Agreement, dated as of May 27, 1998, by and between Pharsight and Joseph S. Gauthier.                                                           
|10.8*          |  | Master Loan and Security Agreement, dated as of February 26, 1999, by and between Pharsight and Transamerica Business Credit Corporation.                      
|10.12*(2)      |  | Promissory note, dated as of July 25, 1996 from Robin Kehoe in favor of Pharsight.                                                                             
|10.13*(2)      |  | Promissory note, dated as of June 2, 1998, from Robin Kehoe in favor of Pharsight.                                                                             
|10.14*(2)      |  | Promissory note, dated as of June 15, 1999 from Robin Kehoe in favor of Pharsight.                                                                             
|10.15*(2)      |  | Promissory note, dated as of January 25, 1998, from Daniel Weiner in favor of Pharsight.                                                                       
|10.16*(2)      |  | Form of Indemnity Agreement to be entered into between Pharsight and each of its officers and directors.                                                       
|               |  |                                                                                                                                                                

69

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|10.17*(2)   |  | Pharsight's 1997 Stock Option Plan.                                                                                                                                       
|----------- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|10.18*(2)   |  | Pharsight's 1995 Stock Option Plan.                                                                                                                                       
|10.19*(2)   |  | Pharsight's 2000 Equity Incentive Plan and related documents.                                                                                                             
|10.20*(2)   |  | Pharsight's 2000 Employee Stock Purchase Plan and related documents.                                                                                                      
|10.21*(2)   |  | 2000 CEO Non-Qualified Stock Option Plan.                                                                                                                                 
|10.22(2)(4) |  | Employment Letter, dated September 26, 2001, between the Company and Mark Robillard                                                                                       
|10.23(2)(5) |  | Severance Agreement, Dated November 16, 2001, between the Company and Michael Emley                                                                                       
|10.24(2)(5) |  | Employment Letter, Dated December 14, 2001, between the Company and Robin Kehoe                                                                                           
|10.25(2)(5) |  | Services Agreement, Dated October 4, 2001, between the Company and David Powell, Inc.                                                                                     
|10.26(3)    |  | Loan and Security Agreement, dated as of June 13, 2001, by and between Pharsight and Silicon Valley Bank.                                                                 
|10.26.1(3)  |  | Negative Pledge Agreement, dated as of June 13, 2001, by and between Pharsight and Silicon Valley Bank.                                                                   
|10.26.2(3)  |  | Notice of Pledge and Security, dated June 28, 2001, by and among Pharsight, Morgan Stanley & Co. Incorporated and Silicon Valley Bank.                                    
|10.27(3)    |  | Export-Import Bank Loan and Security Agreement, dated June 13, 2001, by and between Pharsight and Silicon Valley Bank.                                                    
|10.27.1(3)  |  | Export-Import Bank of the United States Working Capital Guarantee Program Borrower Agreement, dated June 13, 2001, by and between Pharsight and Silicon Valley Bank.      
|10.28(2)(6) |  | Employment Letter, Dated February 5, 2002, between the Company and Michael Perry                                                                                          
|10.29(6)    |  | Loan Modification Agreement, dated as of June 18, 2002, by and between Pharsight and Silicon Valley Bank.                                                                 
|10.29.1(6)  |  | Export-Import Bank of the United States Working Capital Guarantee Program Borrower Agreement, dated as of June 18, 2002, by and between Pharsight and Silicon Valley Bank.
|10.30(6)    |  | Loan Modification Agreement, dated as of June 13, 2002, by and between Pharsight and Silicon Valley Bank.                                                                 
|10.31(6)    |  | Preferred Stock and Warrant Purchase Agreement, dated June 25, 2002.                                                                                                      
|10.32(6)    |  | Form of Warrant for the Purchase of Shares of Common Stock.                                                                                                               
|10.33(6)    |  | Loan Modification Agreement, dated June 26, 2002 by and between Pharsight and Silicon Valley Bank.                                                                        
|10.34(2)(7) |  | Employment Letter, dated August 16, 2002, between Company and John Wehrli.                                                                                                
|10.35(2)(7) |  | Employment Letter, dated August 16, 2002, between Company and Charles Faas.                                                                                               
|10.36(2)(7) |  | Employment Letter, dated August 19, 2002, between Company and Robert Powell.                                                                                              
|10.37(2)(7) |  | Employment Letter, dated August 20, 2002, between Company and Arthur Reidel.                                                                                              
|10.38(2)(7) |  | Employment Letter, dated September 4, 2002, between Company and Shawn O'Connor.                                                                                           
|            |  |                                                                                                                                                                           

70

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|10.39(2)(7) |  | Employment Letter, dated September 27, 2002, between Company and Daniel Weiner.                                                                                 
|----------- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------
|10.40(7)    |  | Loan Modification Agreement, dated as of October 23, 2002, by and between Pharsight Corporation and Silicon Valley Bank.                                        
|10.41(8)    |  | Letter Agreement dated October 16, 2002 between Pharsight Corporation, Alloy Ventures and Sprout Group.                                                         
|10.42       |  | Amendment No. 1 to Preferred Stock and Warrant Purchase Agreement and Waiver, dated February 13, 2003.                                                          
|10.43(2)    |  | Severance Agreement, Dated February 26, 2003, between the Company and Michael Perry.                                                                            
|10.44(2)    |  | Employment Letter, dated March 6, 2003, between Company and Charles Faas.                                                                                       
|10.45(2)    |  | Employment Letter, dated March 20, 2003, between Company and Shawn O'Connor.                                                                                    
|10.46(2)    |  | Separation Agreement, dated March 21, 2003, between Company and Michael Schwartz.                                                                               
|10.47       |  | Letter Agreement dated May 22, 2003 between Pharsight Corporation, Alloy Ventures and Sprout Group                                                              
|10.48       |  | Loan Modification Agreement, dated as of May 28, 2003, by and between Pharsight Corporation and Silicon Valley Bank.                                            
|10.49       |  | Third Amendment to the Lease dated June 11, 1998 by and between Asset Growth Partners Ltd. as Lessor and Pharsight Corporation as Lessee, dated January 31, 2003
|23.1        |  | Consent of Ernst & Young LLP, Independent Auditors.                                                                                                             
|24.1        |  | Power of Attorney (see signature page hereof).                                                                                                                  
|99.1        |  | Certification by the CEO and CFO of Pharsight Corporation.                                                                                                      

---

71

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SCHEDULE IIVALUATION AND QUALIFYING ACCOUNTS  PHARSIGHT CORPORATION  March 31, 2003  (amounts in thousands)

|Description               |                               | Balance
as of
Beginning
of Year |  | Additions
Charged to
Costs and
Expenses |    | Deductions(1) |   | Balance
as of End
of Year
|------------------------- | ----------------------------- | ------------------------------- |  | --------------------------------------- | -- | ------------- | - | -------------------------
|Year ended March 31, 2003 |                               |                                 |  |                                         |    |               |   |                          
|                          | Deducted from asset accounts: |                                 |  |                                         |    |               |   |                          
|                          |                               | Allowance for doubtful accounts |  | $                                       | 94 |               | $ |                         
|Year ended March 31, 2002 |                               |                                 |  |                                         |    |               |   |                          
|                          | Deducted from asset accounts: |                                 |  |                                         |    |               |   |                          
|                          |                               | Allowance for doubtful accounts |  | $                                       | 95 |               | $ |                         
|Year ended March 31, 2001 |                               |                                 |  |                                         |    |               |   |                          
|                          | Deducted from asset accounts: |                                 |  |                                         |    |               |   |                          
|                          |                               | Allowance for doubtful accounts |  | $                                       | 27 |               | $ | 98                       

---

72

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SIGNATURES

Pursuant to the requirements of the Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to
be signed on its behalf by the undersigned, thereunto duly authorized, in Mountain View, California, on the 9th day of June 2003.

| |  | PHARSIGHT CORPORATION
| |  | ---------------------
| |  | By:                  

73

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POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints Shawn M. O'Connor and Charles K. Faas,
as true and lawful attorneys-in-fact and agents with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities to sign
this Annual Report on Form 10-K filed herewith and any or all amendments to said report, and to
file the same, with all exhibits thereto, and other documents in connection therewith, with the Securities and Exchange Commission granting unto said attorneys-in-fact and
agents the full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the foregoing, as to all intents and purposes as he or she might or
could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents or any of them, or his substitute, may lawfully do or cause to be done by virtue
hereof.

Pursuant
to the requirements of the Securities Act of 1933, as amended, this report has been signed by the following persons in the capacities and on the dates indicated below.

|Signature                                                           |  | Title                                                                       |  | Date        
|------------------------------------------------------------------- |  | --------------------------------------------------------------------------- |  | ------------
|                                                                    |  |                                                                             |  |             
|/s/SHAWN M. O'CONNORShawn M. O'Connor                               |  | President, Chief Executive Officer (Principal Executive Officer) & Director |  | June 9, 2003
|/s/CHARLES K. FAASCharles K. Faas                                   |  | Vice President, Finance and Chief Financial Officer                         |  | June 9, 2003
|/s/ARTHUR H. REIDELArthur H. Reidel                                 |  | Chairman of the Board                                                       |  | June 9, 2003
|/s/STEVEN D. BROOKSSteven D. Brooks                                 |  | Director                                                                    |  | June 9, 2003
|/s/PHILIPPE O. CHAMBON, M.D., PH.D.Philippe O. Chambon, M.D., Ph.D. |  | Director                                                                    |  | June 9, 2003
|/s/ROBERT B. CHESSRobert B. Chess                                   |  | Director                                                                    |  | June 9, 2003
|/s/DOUGLAS E. KELLY, M.D.Douglas E. Kelly, M.D.                     |  | Director                                                                    |  | June 9, 2003
|/s/DEAN O. MORTONDean O. Morton                                     |  | Director                                                                    |  | June 9, 2003
|/s/W. FERRELL SANDERSW. Ferrell Sanders                             |  | Director                                                                    |  | June 9, 2003

74

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CERTIFICATIONS

I,
Shawn M. O'Connor, certify that:

1.     I
have reviewed this annual report on Form 10-K of Pharsight Corporation;

2.     Based
on my knowledge, this annual report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made,
in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this annual report;

3.     Based
on my knowledge, the financial statements, and other financial information included in this annual report, fairly present in all material respects the financial
condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this annual report;

4.     The
registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act
Rules 13a-14 and 15d-14) for the registrant and have:



5.     The
registrant's other certifying officer and I have disclosed, based on our most recent evaluation, to the registrant's auditors and the audit committee of registrant's
board of directors (or persons performing the equivalent functions):



6.     The
registrant's other certifying officer and I have indicated in this annual report whether there were significant changes in internal controls or in other factors that
could significantly affect internal controls subsequent to the date of our most recent evaluation, including any corrective actions with regard to significant deficiencies and material weaknesses.

| |  | /s/SHAWN M. O'CONNORShawn M. O'Connor Chief Executive
Officer
| |  | -------------------------------------------------------------

Date:
June 9, 2003

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I,
Charles K. Faas, certify that:

1.     I
have reviewed this annual report on Form 10-K of Pharsight Corporation;

2.     Based
on my knowledge, this annual report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made,
in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this annual report;

3.     Based
on my knowledge, the financial statements, and other financial information included in this annual report, fairly present in all material respects the financial
condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this annual report;

4.     The
registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act
Rules 13a-14 and 15d-14) for the registrant and have:



5.     The
registrant's other certifying officer and I have disclosed, based on our most recent evaluation, to the registrant's auditors and the audit committee of registrant's
board of directors (or persons performing the equivalent functions):



6.     The
registrant's other certifying officer and I have indicated in this annual report whether there were significant changes in internal controls or in other factors that
could significantly affect internal controls subsequent to the date of our most recent evaluation, including any corrective actions with regard to significant deficiencies and material weaknesses.

| |  | /s/CHARLES K. FAASCharles K. Faas Chief Financial
Officer
| |  | ---------------------------------------------------------

Date:
June 9, 2003

76

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INDEX TO EXHIBITS

|Exhibit
Number |  | Description Of Document                                                                                                                                        
|-------------- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------
|3.2(6)         |  | Amended and Restated Certificate of Incorporation of Pharsight.                                                                                                
|3.3*           |  | Bylaws of Pharsight.                                                                                                                                           
|3.4(6)         |  | Certificate of Designations of Series A and Series B Convertible Preferred Stock of Pharsight Corporation.                                                     
|4.1            |  | Reference is made to Exhibits 3.2, 3.3, and 3.4.                                                                                                               
|4.2*           |  | Amended and Restated Investors' Rights Agreement, dated as of September 2, 1999, by and among Pharsight and the investors listed on Exhibit A attached thereto.
|4.3            |  | Reference is made to Exhibits 10.31 and 10.32.                                                                                                                 
|10.1*          |  | Asset Purchase Agreement dated as of May 27, 1998, by and among Pharsight, Mitchell and Gauthier Associates, Inc., Edward E.L. Mitchell and Joseph S. Gauthier.
|10.2*          |  | Lease on Suite 200 at 800 El Camino Real West, Mountain View, California, by and among Pharsight and Asset Growth Partners, dated as of June 11, 1998.         
|10.3*          |  | Co-Ownership Agreement, dated as of the May 27, 1998, by and between Pharsight and Mitchell and Gauthier Associates, Inc.                                      
|10.4*          |  | Noncompetition Agreement, dated as of May 27, 1998, by and between Pharsight and Joseph S. Gauthier.                                                           
|10.8*          |  | Master Loan and Security Agreement, dated as of February 26, 1999, by and between Pharsight and Transamerica Business Credit Corporation.                      
|10.12*(2)      |  | Promissory note, dated as of July 25, 1996 from Robin Kehoe in favor of Pharsight.                                                                             
|10.13*(2)      |  | Promissory note, dated as of June 2, 1998, from Robin Kehoe in favor of Pharsight.                                                                             
|10.14*         |  | Promissory note, dated as of June 15, 1999 from Robin Kehoe in favor of Pharsight.                                                                             
|10.15*         |  | Promissory note, dated as of January 25, 1998, from Daniel Weiner in favor of Pharsight.                                                                       
|10.16*         |  | Form of Indemnity Agreement to be entered into between Pharsight and each of its officers and directors.                                                       
|10.17*         |  | Pharsight's 1997 Stock Option Plan.                                                                                                                            
|10.18*         |  | Pharsight's 1995 Stock Option Plan.                                                                                                                            
|10.19*         |  | Pharsight's 2000 Equity Incentive Plan and related documents.                                                                                                  
|10.20*         |  | Pharsight's 2000 Employee Stock Purchase Plan and related documents.                                                                                           
|10.21*         |  | 2000 CEO Non-Qualified Stock Option Plan.                                                                                                                      
|10.22(2)(4)    |  | Employment Letter, dated September 26, 2001, between the Company and Mark Robillard                                                                            
|10.23(2)(5)    |  | Severance Agreement, Dated November 16, 2001, between the Company and Michael Emley                                                                            
|10.24(2)(5)    |  | Employment Letter, Dated December 14, 2001, between the Company and Robin Kehoe                                                                                
|10.25(2)(5)    |  | Services Agreement, Dated October 4, 2001, between the Company and David Powell, Inc.                                                                          
|10.26(3)       |  | Loan and Security Agreement, dated as of June 13, 2001, by and between Pharsight and Silicon Valley Bank.                                                      
|               |  |                                                                                                                                                                

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|10.26.1(3)  |  | Negative Pledge Agreement, dated as of June 13, 2001, by and between Pharsight and Silicon Valley Bank.                                                                   
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|10.26.2(3)  |  | Notice of Pledge and Security, dated June 28, 2001, by and among Pharsight, Morgan Stanley & Co. Incorporated and Silicon Valley Bank.                                    
|10.27(3)    |  | Export-Import Bank Loan and Security Agreement, dated June 13, 2001, by and between Pharsight and Silicon Valley Bank.                                                    
|10.27.1(3)  |  | Export-Import Bank of the United States Working Capital Guarantee Program Borrower Agreement, dated June 13, 2001, by and between Pharsight and Silicon Valley Bank.      
|10.28(2)(6) |  | Employment Letter, Dated February 5, 2002, between the Company and Michael Perry                                                                                          
|10.29(6)    |  | Loan Modification Agreement, dated as of June 18, 2002, by and between Pharsight and Silicon Valley Bank.                                                                 
|10.29.1(6)  |  | Export-Import Bank of the United States Working Capital Guarantee Program Borrower Agreement, dated as of June 18, 2002, by and between Pharsight and Silicon Valley Bank.
|10.30(6)    |  | Loan Modification Agreement, dated as of June 13, 2002, by and between Pharsight and Silicon Valley Bank.                                                                 
|10.31(6)    |  | Preferred Stock and Warrant Purchase Agreement, dated June 25, 2002.                                                                                                      
|10.32(6)    |  | Form of Warrant for the Purchase of Shares of Common Stock.                                                                                                               
|10.33(6)    |  | Loan Modification Agreement, dated June 26, 2002, by and between Pharsight and Silicon Valley Bank.                                                                       
|10.34(2)(7) |  | Employment Letter, dated August 16, 2002, between Company and John Wehrli.                                                                                                
|10.35(2)(7) |  | Employment Letter, dated August 16, 2002, between Company and Charles Faas.                                                                                               
|10.36(2)(7) |  | Employment Letter, dated August 19, 2002, between Company and Robert Powell.                                                                                              
|10.37(2)(7) |  | Employment Letter, dated August 20, 2002, between Company and Arthur Reidel.                                                                                              
|10.38(2)(7) |  | Employment Letter, dated September 4, 2002, between Company and Shawn O'Connor.                                                                                           
|10.39(2)(7) |  | Employment Letter, dated September 27, 2002, between Company and Daniel Weiner.                                                                                           
|10.40(7)    |  | Loan Modification Agreement, dated as of October 23, 2002, by and between Pharsight Corporation and Silicon Valley Bank.                                                  
|10.41(8)    |  | Letter Agreement dated October 16, 2002 between Pharsight Corporation, Alloy Ventures and Sprout Group.                                                                   
|10.42       |  | Amendment No. 1 to Preferred Stock and Warrant Purchase Agreement and Waiver, dated February 13, 2003.                                                                    
|10.43(2)    |  | Severance Agreement, Dated February 26, 2003, between the Company and Michael Perry.                                                                                      
|10.44(2)    |  | Employment Letter, dated March 6, 2003, between Company and Charles Faas.                                                                                                 
|10.45(2)    |  | Employment Letter, dated March 20, 2003, between Company and Shawn O'Connor.                                                                                              
|10.46(2)    |  | Separation Agreement, dated March 21, 2003, between Company and Michael Schwartz.                                                                                         
|10.47       |  | Letter Agreement dated May 22, 2003 between Pharsight Corporation, Alloy Ventures and Sprout Group                                                                        
|            |  |                                                                                                                                                                           

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|10.48 |  | Loan Modification Agreement, dated as of May 28, 2003, by and between Pharsight Corporation and Silicon Valley Bank.                                            
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|10.49 |  | Third Amendment to the Lease dated June 11, 1998 by and between Asset Growth Partners Ltd. as Lessor and Pharsight Corporation as Lessee, dated January 31, 2003
|23.1  |  | Consent of Ernst & Young LLP, Independent Auditors.                                                                                                             
|24.1  |  | Power of Attorney (see signature page hereof).                                                                                                                  
|99.1  |  | Certification by the CEO and CFO of Pharsight Corporation.                                                                                                      

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