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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549





FORM 10-Q





(Mark One)

|x | QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ---------------------------------------------------------------------------------------

For the quarterly period ended June 30, 2010

or



| ̈ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ----------------------------------------------------------------------------------------

Commission file number: 001-33438





NEUROGESX,
INC.

(Exact name of registrant as specified in its charter)







|                                                               |  |                                        
|-------------------------------------------------------------- |  | ---------------------------------------
|Delaware                                                       |  | 94-3307935                             
|(State or other jurisdiction of
incorporation or organization) |  | (I.R.S. Employer
Identification Number)
|                                                               | 
|2215 Bridgepointe Parkway, Suite 200
San Mateo, California     |  | 94404                                  
|(Address of principal executive offices)                       |  | (Zip Code)                             

Registrants telephone number, including area code: (650) 358-3300





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

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

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller
reporting company. See definitions of large accelerated filer, accelerated filer and smaller reporting company in Rule 12b-2 of the Exchange Act.



|                        |  |                                                  |  |                           |  |  
|----------------------- |  | ------------------------------------------------ |  | ------------------------- |  | -
|Large accelerated filer |  |  ̈                                                |  | Accelerated filer         |  |  ̈
|                        |  |                                                  | 
|Non-accelerated filer   |  | x  (Do not check if a smaller reporting company) |  | Smaller reporting company |  |  ̈

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

Number of shares of common stock, $0.001 par value, outstanding as of July 30, 2010: 17,768,950









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NEUROGESX, INC.

TABLE OF CONTENTS FOR FORM 10-Q

FOR THE QUARTER ENDED JUNE 30, 2010



|                                                                                                                  |  |     
|----------------------------------------------------------------------------------------------------------------- |  | ----
|                                                                                                                  |  | Page
|PART I. FINANCIAL INFORMATION                                                                                     |  | 1   
|Item 1. Financial Statements (unaudited)                                                                          |  | 1   
|Condensed Consolidated Balance Sheets as of June 30, 2010 and December 31,
2009                                   |  | 1   
|Condensed Consolidated Statements of Operations for the three months and six months ended June 
30, 2010 and 2009 |  | 2   
|Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2010 and 2009                   |  | 3   
|Notes to Condensed Consolidated Financial Statements                                                              |  | 4   
|Item 2. Managements Discussion and Analysis of Financial Condition and Results of Operations                     |  | 16  
|Item 3. Quantitative and Qualitative Disclosures About Market Risk                                                |  | 26  
|Item 4T. Controls and Procedures                                                                                  |  | 27  
|                                                                                                                  | 
|PART II. OTHER INFORMATION                                                                                        |  | 28  
|Item 1. Legal Proceedings                                                                                         |  | 28  
|Item 1A. Risk Factors                                                                                             |  | 28  
|Item 2. Unregistered Sales of Equity Securities and Use of Proceeds                                               |  | 48  
|Item 3. Defaults Upon Senior Securities                                                                           |  | 48  
|Item 4. [Removed and Reserved]                                                                                    |  | 48  
|Item 5. Other Information                                                                                         |  | 48  
|Item 6. Exhibits                                                                                                  |  | 49  
|                                                                                                                  | 
|SIGNATURES                                                                                                        |  | 50  
|                                                                                                                  | 
|EXHIBIT INDEX                                                                                                     |  | 51  



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##### Table of Contents

PART I. FINANCIAL INFORMATION



|ITEM 1. | FINANCIAL STATEMENTS (Unaudited)
|------- | --------------------------------

NeurogesX, Inc.

Condensed Consolidated Balance Sheets

(in thousands)



|                                                     |  |              |          |   |                  |   |          |  
|---------------------------------------------------- |  | ------------ | -------- | - | ---------------- | - | -------- | -
|                                                     |  | June 30,2010 |          |   | December 31,2009 |  
|                                                     |  | (unaudited)  |          |   | (Note 1)         |  
|Assets                                               |  |              |          |   |                  |   |          |  
|Current assets:                                      |  |              |          |   |                  |   |          |  
|Cash and cash equivalents                            |  | $            | 14,690   |   |                  | $ | 29,695   |  
|Short term investments                               |  |              | 53,197   |   |                  |   | 20,864   |  
|Receivable from collaborative partner                |  |              | 798      |   |                  |   | 678      |  
|Trade receivable                                     |  |              | 186      |   |                  |   |         |  
|Prepaid expenses and other current assets            |  |              | 1,024    |   |                  |   | 769      |  
|Restricted cash                                      |  |              | 290      |   |                  |   | 40       |  
|Inventories, net                                     |  |              | 1,091    |   |                  |   |         |  
|                                                     |  |              |          |   |                  |   |          |  
|Total current assets                                 |  |              | 71,276   |   |                  |   | 52,046   |  
|                                                     |  |             
|Property and equipment, net                          |  |              | 935      |   |                  |   | 739      |  
|Other assets                                         |  |              | 246      |   |                  |   |         |  
|Restricted cash                                      |  |              | 120      |   |                  |   | 120      |  
|                                                     |  |              |          |   |                  |   |          |  
|Total Assets                                         |  | $            | 72,577   |   |                  | $ | 52,905   |  
|                                                     |  |              |          |   |                  |   |          |  
|                                                     |  |             
|Liabilities and Stockholders Equity (Deficit)       |  |              |          |   |                  |   |          |  
|Liabilities                                          |  |              |          |   |                  |   |          |  
|Current Liabilities                                  |  |              |          |   |                  |   |          |  
|Accounts payable                                     |  | $            | 1,388    |   |                  | $ | 65       |  
|Accrued compensation                                 |  |              | 1,225    |   |                  |   | 2,157    |  
|Accrued license fees                                 |  |              |         |   |                  |   | 1,213    |  
|Accrued research and development                     |  |              | 517      |   |                  |   | 670      |  
|Other accrued expenses                               |  |              | 2,746    |   |                  |   | 1,222    |  
|Deferred product revenue, net                        |  |              | 256      |   |                  |   |         |  
|Deferred collaborative revenue                       |  |              | 7,242    |   |                  |   | 7,242    |  
|Long term obligations-current portion                |  |              | 680      |   |                  |   |         |  
|Notes payable - current portion                      |  |              |         |   |                  |   | 191      |  
|                                                     |  |              |          |   |                  |   |          |  
|Total current liabilities                            |  |              | 14,054   |   |                  |   | 12,760   |  
|                                                     |  |             
|Non-current liabilities                              |  |              |          |   |                  |   |          |  
|Deferred revenue collaborative partner               |  |              | 36,010   |   |                  |   | 39,601   |  
|Deferred rent                                        |  |              | 208      |   |                  |   | 291      |  
|Long term obligations                                |  |              | 40,115   |   |                  |   |         |  
|                                                     |  |              |          |   |                  |   |          |  
|Total non-current liabilities                        |  |              | 76,333   |   |                  |   | 39,892   |  
|                                                     |  |             
|Stockholders equity (deficit):                      |  |              |          |   |                  |   |          |  
|Common stock                                         |  |              | 18       |   |                  |   | 18       |  
|Additional paid-in capital                           |  |              | 213,575  |   |                  |   | 212,254  |  
|Accumulated other comprehensive income (loss)        |  |              | 5        |   |                  |   | (8       | )
|Accumulated deficit                                  |  |              | (231,408 | ) |                  |   | (212,011 | )
|                                                     |  |              |          |   |                  |   |          |  
|Total stockholders equity (deficit)                 |  |              | (17,810  | ) |                  |   | 253      |  
|                                                     |  |              |          |   |                  |   |          |  
|Total liabilities and stockholders equity (deficit) |  | $            | 72,577   |   |                  | $ | 52,905   |  
|                                                     |  |              |          |   |                  |   |          |  

See accompanying notes



1



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NeurogesX, Inc.

Condensed Consolidated Statements of Operations

(in thousands, except share and per share data)

(unaudited)



|                                                            |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  
|----------------------------------------------------------- |  | --------------------------- | ---------- | - | ------------------------- | - | ---------- | ---- |  | - | ---------- | - |  | - | ---------- | -
|                                                            |  | Three Months Ended June 30, |            |   | Six Months Ended June 30, |  
|                                                            |  | 2010                        |            |   | 2009                      |   |            | 2010 |  |   | 2009       |  
|Net product revenue                                         |  | $                           | 33         |   |                           | $ |           |      |  | $ | 33         |   |  | $ |           |  
|Collaborative revenue                                       |  |                             | 2,051      |   |                           |   |           |      |  |   | 3,837      |   |  |   |           |  
|                                                            |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  
|Total Revenues                                              |  |                             | 2,084      |   |                           |   |           |      |  |   | 3,870      |   |  |   |           |  
|                                                            |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  
|Operating expenses:                                         |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  
|Cost of goods sold                                          |  |                             | 45         |   |                           |   |           |      |  |   | 45         |   |  |   |           |  
|Research and development                                    |  |                             | 2,745      |   |                           |   | 2,780      |      |  |   | 4,868      |   |  |   | 5,106      |  
|Selling, general and administrative                         |  |                             | 8,271      |   |                           |   | 2,605      |      |  |   | 17,078     |   |  |   | 4,794      |  
|                                                            |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  
|Total operating expenses                                    |  |                             | 11,061     |   |                           |   | 5,385      |      |  |   | 21,991     |   |  |   | 9,900      |  
|                                                            |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  
|Loss from operations                                        |  |                             | (8,977     | ) |                           |   | (5,385     | )    |  |   | (18,121    | ) |  |   | (9,900     | )
|Interest income                                             |  |                             | 22         |   |                           |   | 11         |      |  |   | 29         |   |  |   | 45         |  
|Interest expense                                            |  |                             | (1,289     | ) |                           |   | (68        | )    |  |   | (1,289     | ) |  |   | (188       | )
|Other income (expense), net                                 |  |                             | 11         |   |                           |   | 10         |      |  |   | (16        | ) |  |   | 10         |  
|                                                            |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  
|Net loss                                                    |  | $                           | (10,233    | ) |                           | $ | (5,432     | )    |  | $ | (19,397    | ) |  | $ | (10,033    | )
|                                                            |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  
|Basic and diluted net loss per share                        |  | $                           | (0.58      | ) |                           | $ | (0.31      | )    |  | $ | (1.09      | ) |  | $ | (0.57      | )
|                                                            |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  
|Shares used to compute basic and diluted net loss per share |  |                             | 17,748,720 |   |                           |   | 17,580,158 |      |  |   | 17,737,499 |   |  |   | 17,574,455 |  
|                                                            |  |                             |            |   |                           |   |            |      |  |   |            |   |  |   |            |  

See accompanying notes.



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NeurogesX, Inc.

Condensed Consolidated Statements of Cash Flows

(in thousands, except share and per share data)

(unaudited)



|                                                                        |  |                          |         |   |      |   |         |  
|----------------------------------------------------------------------- |  | ------------------------ | ------- | - | ---- | - | ------- | -
|                                                                        |  | Six Months EndedJune 30, |        
|                                                                        |  | 2010                     |         |   | 2009 |  
|Operating activities                                                    |  |                          |         |   |      |   |         |  
|Net loss                                                                |  | $                        | (19,397 | ) |      | $ | (10,033 | )
|Adjustments to reconcile net loss to cash used in operating activities: |  |                          |         |   |      |   |         |  
|                                                                        |  |                         
|Depreciation                                                            |  |                          | 163     |   |      |   | 96      |  
|Amortization/accretion of debt issuance costs and debt discount         |  |                          | 13      |   |      |   | 56      |  
|Amortization of investment premiums                                     |  |                          | 212     |   |      |   | 53      |  
|Stock based compensation expense                                        |  |                          | 1,126   |   |      |   | 897     |  
|Disposal of property and equipment                                      |  |                          | (2      | ) |      |   |        |  
|Changes in operating assets and liabilities:                            |  |                          |         |   |      |   |         |  
|Restricted cash                                                         |  |                          | (250    | ) |      |   |        |  
|Trade receivable                                                        |  |                          | (186    | ) |      |   |        |  
|Receivable from collaborative partner                                   |  |                          | (119    | ) |      |   |        |  
|Prepaid expenses and other current assets                               |  |                          | (195    | ) |      |   | (55     | )
|Inventories                                                             |  |                          | (1,091  | ) |      |   |        |  
|Accounts payable                                                        |  |                          | 1,323   |   |      |   | 120     |  
|Accrued compensation                                                    |  |                          | (932    | ) |      |   | (166    | )
|Accrued license fees                                                    |  |                          | (1,213  | ) |      |   |        |  
|Accrued research and development                                        |  |                          | (152    | ) |      |   | (622    | )
|Other accrued expenses                                                  |  |                          | 1,494   |   |      |   | 315     |  
|Accrued interest payable on long term obligations                       |  |                          | 1,277   |   |      |   |        |  
|Deferred product revenue                                                |  |                          | 256     |   |      |   |        |  
|Deferred collaborative revenue                                          |  |                          | (3,591  | ) |      |   |        |  
|Deferred rent                                                           |  |                          | (51     | ) |      |   | 140     |  
|                                                                        |  |                          |         |   |      |   |         |  
|Net cash used in operating activities                                   |  |                          | (21,315 | ) |      |   | (9,199  | )
|                                                                        |  |                          |         |   |      |   |         |  
|Investing activities                                                    |  |                          |         |   |      |   |         |  
|Purchases of short-term investments                                     |  |                          | (55,786 | ) |      |   | (10,036 | )
|Proceeds from maturities of short-term investments                      |  |                          | 23,254  |   |      |   | 15,500  |  
|Purchases of property and equipment                                     |  |                          | (360    | ) |      |   | (8      | )
|                                                                        |  |                          |         |   |      |   |         |  
|Net cash (used in)/provided by investing activities                     |  |                          | (32,892 | ) |      |   | 5,456   |  
|                                                                        |  |                          |         |   |      |   |         |  
|Financing activities                                                    |  |                          |         |   |      |   |         |  
|Repayment of notes payable                                              |  |                          | (191    | ) |      |   | (1,804  | )
|Payments of Long term obligations issuance costs                        |  |                          | (298    | ) |      |   |        |  
|Proceeds from issuance of long term obligations                         |  |                          | 39,505  |   |      |   |        |  
|Proceeds from issuance of common stock                                  |  |                          | 186     |   |      |   | 26      |  
|                                                                        |  |                          |         |   |      |   |         |  
|Net cash (used in)/provided by financing activities                     |  |                          | 39,202  |   |      |   | (1,778  | )
|                                                                        |  |                          |         |   |      |   |         |  
|                                                                        |  |                          |         |   |      |   |        |  
|Net increase in cash and cash equivalents                               |  |                          | (15,005 | ) |      |   | (5,521  | )
|Cash and cash equivalents, beginning of period                          |  |                          | 29,695  |   |      |   | 10,435  |  
|                                                                        |  |                          |         |   |      |   |         |  
|Cash and cash equivalents, end of period                                |  | $                        | 14,690  |   |      | $ | 4,914   |  
|                                                                        |  |                          |         |   |      |   |         |  
|Supplemental cash flow information                                      |  |                          |         |   |      |   |         |  
|Cash paid for interest                                                  |  | $                        | 2       |   |      | $ | 132     |  
|                                                                        |  |                          |         |   |      |   |         |  

See accompanying notes



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Note 1. The Company

Nature of Operations

NeurogesX, Inc. (the Company) is a biopharmaceutical company focused on developing and commercializing novel pain management
therapies. The Company is assembling a portfolio of pain management product candidates based on known chemical entities to develop innovative new therapies which the Company believes may offer substantial advantages over currently available
treatment options. The Companys initial focus is on the management of chronic peripheral neuropathic pain conditions.

The Companys first commercial product,
Qutenza®, is a localized dermal delivery system designed to treat certain neuropathic pain conditions and was
approved by the United States Food and Drug Administration (FDA) in November 2009 for the management of neuropathic pain associated with postherpetic neuralgia (PHN). In April 2010, the Company made Qutenza commercially
available in the United States through a specialty distribution and specialty pharmacy network and is being commercialized in the U.S. by the Companys sales force.

In May 2009, Qutenza received a marketing authorization (MA) in the European Union for the treatment of peripheral
neuropathic pain in non-diabetic adults, either alone or in combination with other medicinal products for pain. In June 2009, the Company entered into a Distribution, Marketing and License Agreement (the Astellas Agreement) with Astellas
Pharma Europe Ltd. (Astellas or Collaborative Partner), under which Astellas was granted an exclusive license to commercialize Qutenza in the European Economic Area, which includes the 27 countries of the European Union,
Iceland, Norway, and Liechtenstein, as well as Switzerland, certain countries in Eastern Europe, the Middle East and Africa (Licensed Territory). In the second quarter of 2010, Astellas made Qutenza commercially available in Germany,
Austria and the United Kingdom (UK) with initial launch activities focused on intensive site training.

The Company was
incorporated in California as Advanced Analgesics, Inc. on May 28, 1998 and changed its name to NeurogesX, Inc. in September 2000. In February 2007, the Company reincorporated into Delaware. The Company is located in San Mateo, California.

During the third quarter of 2009 the Company transitioned out of the development stage.

Principles of Consolidation

The accompanying financial statements include the accounts of the Company and its wholly-owned subsidiary, NeurogesX UK Limited, which was
incorporated as of June 1, 2004. NeurogesX UK Limited was established for the purposes of conducting clinical trials in the UK and marketing approval submission. The subsidiary has no assets other than the initial capital totaling one Pound
Sterling.

Basis of Presentation

The accompanying unaudited condensed consolidated interim financial statements have been prepared in accordance with generally accepted
accounting principles in the United States (GAAP) for interim financial information on the same basis as the annual consolidated financial statements and in accordance with instructions to Form 10-Q and Rule 10-01 of
Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. The unaudited condensed consolidated interim financial statements include all adjustments (consisting only
of normal recurring adjustments) that management believes are necessary for the fair statement of the balances



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and results for the periods presented. These unaudited condensed consolidated interim financial statement results are not necessarily indicative of results to be expected for the full fiscal year
or any future interim period.

The balance sheet at December 31, 2009 has been derived from the audited consolidated
financial statements at that date. The unaudited condensed consolidated interim financial statements and related disclosures have been prepared with the presumption that users of such information have read or have access to the audited consolidated
financial statements for the preceding fiscal year. Accordingly, these financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto for the year ended December 31, 2009 contained in the
Companys 2009 Form 10-K.

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP 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.

Note 2. Summary of
Significant Accounting Policies

Product revenue

In April 2010, the Company made Qutenza commercially available to its specialty distributor and specialty pharmacy customers, in the
United States. Under the Companys agreements with its customers, the customers take title to the product upon shipment and have the right to return damaged product, product shipped in error and expired or short-dated product. As Qutenza is new
to the marketplace, the Company is currently assessing the flow of product through its distribution channel. The Company is deferring the recognition of revenues, and related product costs, on Qutenza product shipments to its specialty distributor
and specialty pharmacy customers until an estimate of returns can be made. However, until such time as an estimate of returns can be made, the Company is recognizing Qutenza product revenues, and related product costs, at the time the product is
shipped by the customer to physicians for administration to patients. Further, during the launch phase of Qutenza commercialization, the Company is offering extended payment terms to its customers. As a result, although product has been sold by the
customers to physicians for administration to patients, the Company is deferring revenue until collection has occurred. Revenues may be reduced for certain governmental discounts based on the contractual terms of sales.

The application of the above revenue recognition policy resulted in the recognition of $33,000 from total sales of $308,000 for the three
months ended June 30, 2010. At June 30, 2010, gross deferred product revenues totaled $275,000 which is reported net of associated deferred cost of goods sold of $19,000.

Revenue from Astellas Agreement

In June 2009, NeurogesX entered into the Astellas Agreement which provides for an exclusive license by the Company to Astellas for the
promotion, distribution and marketing of Qutenza in the Licensed Territory, an option to license NGX-1998, a product candidate that is a non-patch liquid formulation of capsaicin, in the Licensed Territory, participation on a joint steering
committee and, through a related supply agreement entered into with Astellas (the Supply Agreement), supply of product until direct supply arrangements between Astellas and third party manufacturers are established, which the Company
anticipates may be within 18 to 24 months from the execution of the Astellas Agreement. Revenue under this arrangement includes upfront non-refundable fees and may also include additional option payments for the development of



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and license to NGX-1998, milestone payments upon achievement of certain product sales levels and royalties on product sales.

Revenue recognized from collaborative agreements is based upon the provisions of Codification Topic 605, Revenue, and Codification
Topic 808, Collaborative Arrangements.

In accordance with Codification subtopic 605-25, Revenue Recognition
Multiple Element Arrangements,multiple element arrangements are analyzed to determine whether the various performance obligations, or elements, can be separated or whether they must be accounted for as a single unit of accounting. The
determination of whether an element can be separated or accounted for as a single unit of accounting is based on the availability of evidence with regard to standalone value of each delivered element. If the fair value of all undelivered performance
obligations can be determined, then all obligations would then be accounted for separately as performed. If any delivered element is considered to either: 1) not have standalone value or 2) have standalone value but the fair value of any of the
undelivered performance obligations are not determinable, then any delivered elements of the arrangement would be accounted for as a single unit of accounting and the multiple elements would be grouped and recognized as revenue over the longest
estimated performance obligation period.

Significant management judgment is required in determining the level of effort
required under an arrangement and the period over which the performance obligations are estimated to be completed. In addition, if the Company is involved in a joint steering committee as part of a multiple element arrangement that is accounted for
as a single unit of accounting, an assessment is made as to whether the involvement in the steering committee constitutes a performance obligation or a right to participate.

Revenue recognition of non-refundable upfront license fees commences when there is a contractual right to receive such payment, the
contract price is fixed or determinable, the collection of the resulting receivable is reasonably assured and there are no further performance obligations under the license agreement.

With respect to the Astellas Agreement and related agreements, the Company views this arrangement as a multiple element arrangement with
the key elements consisting of an exclusive license to Qutenza in the Licensed Territory, an obligation to conduct certain development activities associated with NGX-1998, participation on a joint steering committee and supply of Qutenza components
to Astellas until such time that Astellas can establish a direct supply relationship with product vendors. Because not all of these elements have both standalone value and objective and reliable evidence of fair value, the Company is accounting for
such elements as a single unit of accounting in accordance with Codification subtopic 605-25, Revenue Recognition Multiple Element Arrangements. Further, the agreement provides for the Companys mandatory participation in a joint
steering committee, which the Company believes represents a substantive performance obligation and also the estimated last delivered element under the Astellas Agreement and related agreements. Therefore, the Company is recognizing revenue
associated with upfront payments and license fees ratably over the term of the joint steering committee performance obligation. The Company estimates this performance obligation will be delivered ratably through June 2016.

At the inception of the Astellas Agreement, the upfront license fees were subject to a refund right, which expired upon transfer of the
Companys MA for Qutenza in the European Union to Astellas. In September 2009, the transfer of the MA to Astellas was completed and therefore the upfront license fees became non-refundable and revenue recognition of the upfront license fees
commenced.

In the accompanying financial statements, Collaborative revenue represents revenue associated with the Astellas
Agreement and related agreements. Deferred collaborative revenue arises from the excess of cash received or receivable over cumulative revenue recognized for the period. The Company will record royalty revenue based upon Astellas reported net
sales of Qutenza in the Astellas Territory. The Company will



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recognize royalty revenue from Astellas on a quarter lag basis due to timing of Astellas reporting such royalties to the Company.

Cost of goods sold

Cost of goods sold includes costs to procure, manufacture and distribute Qutenza including certain fixed costs incurred in the
distribution channel as well as The Reagents of the University of California (UC) and Lohmann Therapie-Systeme AG (LTS) royalties. Costs associated with the manufacture of Qutenza prior to FDA approval were previously
expensed as research and development in the period incurred. Cost of goods sold associated with deferred product revenue will be deferred and recognized in the same period as the associated product revenue.

Inventory

Inventories are determined at the lower of cost or market value with cost determined under the specific identification method. Inventories
consist of raw materials, work in process and finished goods. Raw materials include certain starting materials used in the production of the active pharmaceutical ingredient of Qutenza. Work in process includes the bulk inventory of the active
pharmaceutical ingredient, patches and cleansing gel of Qutenza that are in the process of being manufactured or have completed manufacture and are awaiting final packaging, including related internal labor and overhead costs. Finished goods include
the final packaged kits that contain the Qutenza patch and cleansing gel and that are ready for commercial sale. Qutenza received FDA approval for sale in the United States during the fourth quarter of 2009; costs incurred prior to FDA approval had
been recorded as research and development expense on the Companys condensed consolidated statement of operations. On a quarterly basis, the Company analyzes its inventory levels and writes down inventory that has become obsolete, inventory
that has a cost basis in excess of the expected net realizable value and inventory that is in excess of expected requirements based upon anticipated product revenues.

Prepaid Collaboration Supplies

Costs to manufacture product for supply to Astellas under its Supply Agreement, including internal labor and overhead costs and third
party manufacturing, packaging and transportation costs are classified as prepaid collaboration supplies, which is included in Prepaid expenses and other current assets on the Companys condensed consolidated balance sheet, until such time as
those supplies are delivered to Astellas.

Stock-Based Compensation

The Company has elected to use the Black-Scholes option valuation model to estimate the fair value of stock options. Stock compensation
expense relating to options with acceleration of vesting dependent upon the achievement of milestones is recognized over a period which is the shorter of:



| |  |  | the Companys evaluation of the probability of achievement of each respective milestone and the related estimated date of achievement; or
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the otherwise stated time-based vesting period.
| | - |  | -----------------------------------------------

The following tables show the assumptions used to compute stock-based compensation expense for stock options granted to employees and
members of the board of directors and the assumptions used to compute stock-based compensation expense for the Companys Employee Stock Purchase Plan (ESPP) for the three and six month periods ended June 30, 2010 and 2009 using
the Black-Scholes valuation model:



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|                         |  |                             |   |  |                           |   |  |           |   |  |           |  
|------------------------ |  | --------------------------- | - |  | ------------------------- | - |  | --------- | - |  | --------- | -
|                         |  | Three Months Ended June 30, |   |  | Six Months Ended June 30, |  
|                         |  | 2010                        |   |  | 2009                      |   |  | 2010      |   |  | 2009      |  
|Stock Options            |  |                             |   |  |                           |   |  |           |   |  |           |  
|Expected dividend yield  |  | 0                           | % |  | 0                         | % |  | 0         | % |  | 0         | %
|Expected volatility      |  | 65                          | % |  | 67                        | % |  | 66        | % |  | 67  70   | %
|Expected life (in years) |  | 6.0                         |   |  | 6.0                       |   |  | 6.0       |   |  | 6.0       |  
|Risk-free interest rate  |  | 2.5                         | % |  | 2.9                       | % |  | 2.8       | % |  | 1.8  2.9 | %
|                         |  |                             |   | 
|ESPP                     |  |                             |   |  |                           |   |  |           |   |  |           |  
|Expected dividend yield  |  | 0                           | % |  | 0                         | % |  | 0         | % |  | 0         | %
|Expected volatility      |  | 46  89                     | % |  | 56  89                   | % |  | 46  89   | % |  | 56  89   | %
|Expected life (in years) |  | 0.5  1.0                   |   |  | 0.5  1.0                 |   |  | 0.5  1.0 |   |  | 0.5  1.0 |  
|Risk-free interest rate  |  | 0.1 0.5                    | % |  | 0.3  2.1                 | % |  | 0.1  0.5 | % |  | 0.3  2.1 | %

Comprehensive Loss

The Company reports comprehensive loss and its components as part of total stockholders equity (deficit).
Comprehensive loss is comprised of net loss and unrealized gains (losses) on available-for-sale investments. For the three months and six month periods ended June 30, 2010 and 2009, comprehensive loss was as follows:



|                                     |  |                             |         |   |                           |   |        |      |  |   |         |   |  |   |         |  
|------------------------------------ |  | --------------------------- | ------- | - | ------------------------- | - | ------ | ---- |  | - | ------- | - |  | - | ------- | -
|                                     |  | Three Months Ended June 30, |         |   | Six Months Ended June 30, |  
|                                     |  | 2010                        |         |   | 2009                      |   |        | 2010 |  |   | 2009    |  
|Net loss                             |  | $                           | (10,233 | ) |                           | $ | (5,432 | )    |  | $ | (19,397 | ) |  | $ | (10,033 | )
|Changes in unrealized gains (losses) |  |                             | 6       |   |                           |   | (7     | )    |  |   | 13      |   |  |   | (30     | )
|                                     |  |                             |         |   |                           |   |        |      |  |   |         |   |  |   |         |  
|Total comprehensive loss             |  | $                           | (10,227 | ) |                           | $ | (5,439 | )    |  | $ | (19,384 | ) |  | $ | (10,063 | )
|                                     |  |                             |         |   |                           |   |        |      |  |   |         |   |  |   |         |  

The fluctuation in accumulated other comprehensive income (loss) represents the net change in fair value for
invested assets as a result of changes in interest rates and other factors affecting fair value and resulting in unrealized gains or losses. The cumulative effect of these periodic fluctuations is reflected as other comprehensive income (loss) on
the accompanying condensed consolidated balance sheets.

Net Loss Per Share

Basic net loss per share is calculated by dividing the net loss by the weighted-average number of common shares outstanding during the
period less the weighted average unvested common shares subject to repurchase and without consideration of common stock equivalents. Diluted net loss per share is computed by dividing the net loss by the weighted-average number of common share and
share equivalents outstanding for the period, less the weighted average unvested common shares subject to repurchase. For purposes of this calculation, warrants and options to purchase common stock are considered to be common equivalent shares but
have been excluded from the calculation of diluted net loss per share as their effect is anti-dilutive. The following table is a reconciliation of the numerator and denominator used in the calculation of basic and diluted net loss per share:



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|                                                                                                                |  |                                                |            |   |                           |   |            |              |  |   |              |   |  |   |            |  
|--------------------------------------------------------------------------------------------------------------- |  | ---------------------------------------------- | ---------- | - | ------------------------- | - | ---------- | ------------ |  | - | ------------ | - |  | - | ---------- | -
|                                                                                                                |  | Three Months Ended June 30,                    |            |   | Six Months Ended June 30, |  
|                                                                                                                |  | 2010                                           |            |   | 2009                      |   |            | 2010         |  |   | 2009         |  
|                                                                                                                |  | (in thousands except share and per share data) |           
|Numerator:                                                                                                      |  |                                                |            |   |                           |   |            |              |  |   |              |   |  |   |            |  
|Net loss                                                                                                        |  | $                                              | (10,233    | ) |                           | $ | (5,432     | )            |  | $ | (19,397      | ) |  | $ | (10,033    | )
|                                                                                                                |  |                                                |            |   |                           |   |            |              |  |   |              |   |  |   |            |  
|Denominator:                                                                                                    |  |                                                |            |   |                           |   |            |              |  |   |              |   |  |   |            |  
|Weighted-average common shares outstanding                                                                      |  |                                                | 17,748,720 |   |                           |   | 17,580,471 |              |  |   | 17,737,499   |   |  |   | 17,574,912 |  
|Less: Weighted-average unvested common shares subject to repurchase                                             |  |                                                |           |   |                           |   | (313       | )            |  |   |             |   |  |   | (457       | )
|                                                                                                                |  |                                                |            |   |                           |   |            |              |  |   |              |   |  |   |            |  
|Denominator for basic and diluted net loss per share                                                            |  |                                                | 17,748,720 |   |                           |   | 17,580,158 |              |  |   | 17,737,499   |   |  |   | 17,574,455 |  
|                                                                                                                |  |                                                |            |   |                           |   |            |              |  |   |              |   |  |   |            |  
|Basic and diluted net loss per share                                                                            |  | $                                              | (0.58      | ) |                           | $ | (0.31      | )            |  | $ | (1.09        | ) |  | $ | (0.57      | )
|                                                                                                                |  |                                                |            |   |                           |   |            |              |  |   |              |   |  |   |            |  
|                                                                                                                |  |                                                |            |  
|                                                                                                                |  |                                                |            |   |                           |   |            | June 30,2010 |  |   | June 30,2009 |  
|Common stock equivalents not included in diluted net loss per share because their effect will be
anti-dilutive: |  |                                                |            |   |                           |   |            |              |  |   |              |   | 
|Options to purchase common stock                                                                                |  |                                                |            |   |                           |   |            |              |  |   | 3,139,599    |   |  |   | 2,029,631  |  
|Warrants outstanding                                                                                            |  |                                                |            |   |                           |   |            |              |  |   | 1,265,846    |   |  |   | 1,265,846  |  
|Common stock subject to repurchase                                                                              |  |                                                |            |   |                           |   |            |              |  |   |             |   |  |   | 209        |  
|                                                                                                                |  |                                                |            |   |                           |   |            |              |  |   |              |   |  |   |            |  
|                                                                                                                |  |                                                |            |   |                           |   |            |              |  |   | 4,405,445    |   |  |   | 3,295,686  |  
|                                                                                                                |  |                                                |            |   |                           |   |            |              |  |   |              |   |  |   |            |  

Recently Issued and Adoption of New Accounting Standards

In October 2009, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU)
No. 2009-13, Revenue Recognition (ASC Topic 605)  Multiple-Deliverable Revenue Arrangements. This guidance modifies previous guidance for multiple element arrangements by allowing the use of the best estimate of selling
price in the absence of vendor-specific objective evidence (VSOE) or third party evidence (TPE) of selling price for determining the selling price of a deliverable. A vendor is now required to use its best estimate of
the selling price when VSOE or TPE of the selling price is not available. In addition, the residual method of allocating arrangement consideration is no longer permitted. This ASU is effective for fiscal years beginning on or after June 15,
2010 and early adoption is permitted beginning in interim periods ended September 30, 2009. The Company is currently evaluating the impact of adopting this ASU on its financial position and results of operations.

In April 2010, the FASB issued ASU No. 2010-17, Revenue RecognitionMilestone Method (ASC Topic 605): Milestone Method of
Revenue Recognition (ASU No. 2010-17). This ASU codifies the consensus reached in EITF Issue No. 08-9, Milestone Method of Revenue Recognition. The amendments to the Codification provide guidance on defining a milestone
and determining when it may be appropriate to apply the milestone method of revenue recognition for research or development transactions. Consideration that is contingent on achievement of a milestone in its entirety may be recognized as revenue in
the period in which the milestone is achieved only if the milestone is judged to meet certain criteria to be considered substantive. Milestones should be considered substantive in their entirety and may not be bifurcated. An arrangement may contain
both substantive and non-substantive milestones, and each milestone should be evaluated individually to determine if it is substantive. ASU No. 2010-17 is effective on a prospective basis for milestones achieved in fiscal years, and interim periods
within those years, beginning on or after June 15, 2010. Early adoption is permitted. If a vendor elects early adoption and the period of adoption is not the beginning of the entitys



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fiscal year, the entity should apply ASU No. 2010-17 retrospectively from the beginning of the year of adoption. The Companys adoption of this guidance did not have an impact on its
financial statements.

Note 3. License Agreements

COLLABORATION AGREEMENT - ASTELLAS

In June 2009, NeurogesX entered into the Astellas Agreement whereby the Company provided an exclusive license to Astellas to commercialize
Qutenza in the Licensed Territory. The Astellas Agreement provided for an upfront payment for past development and the commercialization rights granted, of 30,000,000 Euro, or $41,817,000. In addition, the agreement provided for an upfront payment
of 5,000,000 Euro, or $6,970,000, for future development expenses and an option to license NGX-1998, a product candidate in Phase 1 development. Other elements of the Astellas Agreement include future milestone payments of up to 65,000,000 Euro if
certain predefined sales thresholds of the products licensed under the agreement are met and royalties, as a percentage of net sales of products under the agreement, with such royalties starting in the high teens and escalating into the mid twenties
as revenues increase. In addition Astellas is responsible for UC and LTS royalties on net sales in the Licensed Territory. The Company is participating on a joint steering committee with Astellas to oversee the development and commercialization
activities related to Qutenza and NGX-1998 during the term of the agreement, not to exceed ten years. On the seventh anniversary of the Astellas Agreement, the Company has the unilateral right to opt-out of participation on the joint steering
committee. The Astellas Agreement further provides that upon delivery of certain data related to NGX-1998, Astellas may pay two additional NGX-1998 option payments totaling 5,000,000 Euro. Subsequent to Astellas exercise of the option to
exclusively license NGX-1998 in the Territory, both companies would cooperate on Phase III clinical trials and will share such costs equally.

As of June 30, 2010, the Company recorded deferred revenue totaling $43,252,000 of which $7,242,000 is reflected as the current
portion of deferred revenue. The Astellas upfront license fee and option payments are accounted for as a single unit of accounting, and accordingly, such payments will be recognized ratably through June 2016, which is the Companys estimate of
its substantive performance obligation period related to the joint steering committee. The Company commenced recognizing revenue related to the upfront and option payments upon transfer of the MA for Qutenza to Astellas, which occurred in September
2009, and accordingly, recognized $1,944,000, $1,805,000 and $3,591,000 million as Collaborative revenue in the year ended 2009 and for the three and six months ended June 30, 2010, respectively. Subsequent option exercise payments received, if
any, are expected to be recognized ratably over the remaining estimated period of performance.

The agreement will remain
effective on a country-by-country and product-by-product basis until the later of ten years after the first commercial sale, expiration or abandonment of the last valid patent claim or expiration of all applicable periods of regulatory exclusivity.
Astellas may terminate the agreement for any reason without penalty, consequence or compensation on a country-by-country and product-by-product basis upon written notice to the Company.

Pursuant to the Supply Agreement, the Company has agreed to provide Astellas with a sufficient supply of Qutenza to support their
commercialization efforts until Astellas can establish a direct supply relationship with product vendors. These products will be charged to Astellas at contractually agreed upon costs per unit which are intended to reflect the Companys direct
cost of goods and related internal labor and overhead costs without mark-up for profit. The Company reported amounts received from product transactions under Codification Topic 808, net of direct costs incurred as a component of Collaborative
revenue.



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For the three and six months ended June 30, 2010, the Company included in Collaborative
revenue $246,000 from product transactions, net of direct costs incurred as a component of Collaborative revenue

UNIVERSITY OF CALIFORNIA

In October 2000 and as amended, the Company licensed certain patents from the UC for high-concentration capsaicin for neuropathic pain.
Under the terms of the agreement, the Company is required to pay royalties on net sales of the licensed product up to a maximum of $1,000,000 per annum as well as a percentage of upfront and milestone payments received by the Company from
sublicensing the Companys rights under the agreement (Sublicense Fee). As a result of the Astellas license payment received in July 2009, the Company recorded as a research and development expense the UC Sublicense Fee totaling
$1,213,000 during the third quarter of 2009. This amount was subsequently paid to UC in the quarter ended March 31, 2010.

LTS LOHMANN THERAPIE-SYSTEME AG

In January 2007, the Company entered into a Commercial Supply and License Agreement (LTS Agreement) with LTS Lohmann
Therapie-Systeme AG to manufacture commercial and clinical supply of Qutenza. Under the terms of the agreement, upon first market approval of Qutenza, the Company paid a $140,000, milestone payment upon first commercial approval in the second
quarter of 2009, which was charged to research and development expense. Additionally the Company is required to pay a transfer price for product purchased as well as a royalty on net sales of product purchased under the LTS Agreement.

At June 30, 2010, the Company accrued a liability for UC and LTS royalties owed for approximately $7,000 for product sales related
to the six months ended June 30, 2010.

Note 4. Cash and Cash Equivalents and Short-Term Investments

The following are summaries of cash, cash equivalents and short-term investments (in thousands):



|                            |  |               |        |                      |   |                       |  |   |                     |   |  |   |       
|--------------------------- |  | ------------- | ------ | -------------------- | - | --------------------- |  | - | ------------------- | - |  | - | ------
|                            |  | AmortizedCost |        | GrossUnrealizedGains |   | GrossUnrealizedLosses |  |   | Estimated FairValue
|As of June 30, 2010:        |  |               |        |                      |   |                       |  |   |                     |   |  |   |       
|Cash and money market funds |  | $             | 14,690 |                      | $ |                      |  | $ |                    |   |  | $ | 14,690
|U.S. Treasury securities    |  |               | 53,192 |                      |   | 5                     |  |   |                     |   |  |   | 53,197
|                            |  |               |        |                      |   |                       |  |   |                     |   |  |   |       
|                            |  | $             | 67,882 |                      | $ | 5                     |  | $ |                    |   |  | $ | 67,887
|                            |  |               |        |                      |   |                       |  |   |                     |   |  |   |       
|Reported as:                |  |               |        |                      |   |                       |  |   |                     |   |  |   |       
|Cash and cash equivalents   |  |               |        |                      |   |                       |  |   |                     |   |  | $ | 14,690
|Short-term investments      |  |               |        |                      |   |                       |  |   |                     |   |  |   | 53,197
|                            |  |               |        |                      |   |                       |  |   |                     |   |  |   |       
|                            |  |               |        |                      |   |                       |  |   |                     |   |  | $ | 67,887
|                            |  |               |        |                      |   |                       |  |   |                     |   |  |   |       
|As of December 31, 2009:    |  |               |        |                      |   |                       |  |   |                     |   |  |   |       
|Cash and money market funds |  | $             | 20,651 |                      | $ |                      |  | $ |                    |   |  | $ | 20,651
|U.S. Treasury securities    |  |               | 29,916 |                      |   |                      |  |   | (8                  | ) |  |   | 29,908
|                            |  |               |        |                      |   |                       |  |   |                     |   |  |   |       
|                            |  | $             | 50,567 |                      | $ |                      |  | $ | (8                  | ) |  | $ | 50,559
|                            |  |               |        |                      |   |                       |  |   |                     |   |  |   |       
|Reported as:                |  |               |        |                      |   |                       |  |   |                     |   |  |   |       
|Cash and cash equivalents   |  |               |        |                      |   |                       |  |   |                     |   |  | $ | 29,695
|Short-term investments      |  |               |        |                      |   |                       |  |   |                     |   |  |   | 20,864
|                            |  |               |        |                      |   |                       |  |   |                     |   |  |   |       
|                            |  |               |        |                      |   |                       |  |   |                     |   |  | $ | 50,559
|                            |  |               |        |                      |   |                       |  |   |                     |   |  |   |       



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At June 30, 2010 and December 31, 2009, the contractual maturities of investments
held were less than one year. The Company did not sell any of its investments prior to maturity during the three and six months ended June 30, 2010 or during the year ended December 31, 2009.

Note 5. Inventories

The
components of inventories are as follows (in thousands):



|                 |  |               |      
|---------------- |  | ------------- | -----
|                 |  | June 30, 2010
|Raw materials    |  | $             | 34   
|Work in process  |  |               | 828  
|Finished goods   |  |               | 229  
|                 |  |               |      
|Total            |  |               | 1,091
|                 |  |               |      
|Inventories, net |  | $             | 1,091
|                 |  |               |      

The above inventory balances are costs capitalized
since the Company received FDA approval for the sale of Qutenza in the US market in the fourth quarter of 2009. Prior to FDA approval, all related US inventory costs were expensed to research and development. Included in the work in process is
$382,000 of product awaiting final packaging. On a quarterly basis, the Company analyzes its inventory levels and writes down inventory that has become obsolete, inventory that has a cost basis in excess of the expected net realizable value and
inventory that is in excess of expected requirements based upon anticipated product revenues. No such allowances were considered necessary as of June 30, 2010.

Note 6. Fair Value Measurements

The Company adopted the provisions of Codification Topic 820 Fair Value Measurements and Disclosures effective
January 1, 2008. The standard describes a fair value hierarchy based on three levels of inputs, of which the first two are considered observable and the last unobservable, that may be used to measure fair value, which are the following

Level 1 - Quoted prices in active markets for identical assets or liabilities.

Level 2 - Inputs other than quoted prices included within Level 1 that are observable, either directly or indirectly, such as quoted
prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets
or liabilities.

In accordance with Codification Topic 820, the following table represents the Companys financial assets
(cash equivalents and short-term investments) measured at fair value on a recurring basis and their level within the fair value hierarchy as of June 30, 2010 and December 31, 2009 (in thousands):



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|                                                                                  |  |                                                            |        |                                           |   |                                         |  |       |   |  |   |       
|--------------------------------------------------------------------------------- |  | ---------------------------------------------------------- | ------ | ----------------------------------------- | - | --------------------------------------- |  | ----- | - |  | - | ------
|                                                                                  |  | Quoted Pricesin ActiveMarkets
forIdentical Assets(Level 1) |        | SignificantOtherObservableInputs(Level 2) |   | SignificantUnobservableInputs(Level
 3) |  | Total
|Fair Value Measurements at June 30, 2010:                                         |  |                                                            |        |                                           |   |                                         |  |       |   |  |   |       
|Components of cash equivalents and short-term investments measured at fair value: |  |                                                            |        |                                           |   |                                         |  |       |   |  |   |       
|Money market funds                                                                |  | $                                                          | 14,547 |                                           | $ |                                        |  | $     |  |  | $ | 14,547
|U.S. Treasury securities                                                          |  |                                                            | 53197  |                                           |   |                                        |  |       |  |  |   | 53,197
|                                                                                  |  |                                                            |        |                                           |   |                                         |  |       |   |  |   |       
|Total financial assets measured at fair value                                     |  | $                                                          | 67,744 |                                           | $ |                                         |  | $     |  |  | $ | 67,744
|                                                                                  |  |                                                            |        |                                           |   |                                         |  |       |   |  |   |       
|Operating cash                                                                    |  |                                                            |        |                                           |   | 143                                    
|                                                                                  |  |                                                            |        |                                           |   |                                         |  |       |   |  |   |       
|Total cash and cash equivalents and short-term investments                        |  |                                                            |        |                                           |   |                                         |  |       |   |  | $ | 67,887
|                                                                                  |  |                                                            |        |                                           |   |                                         |  |       |   |  |   |       
|Fair Value Measurements at December 31, 2009:                                     |  |                                                            |        |                                           |   |                                         |  |       |   |  |   |       
|Components of cash equivalents and short-term investments measured at fair value: |  |                                                            |        |                                           |   |                                         |  |       |   |  |   |       
|Money market funds                                                                |  | $                                                          | 20,037 |                                           | $ |                                        |  | $     |  |  | $ | 20,037
|U.S. Treasury securities                                                          |  |                                                            | 29,908 |                                           |   |                                        |  |       |  |  |   | 29,908
|                                                                                  |  |                                                            |        |                                           |   |                                         |  |       |   |  |   |       
|Total financial assets measured at fair value                                     |  | $                                                          | 49,945 |                                           | $ |                                        |  | $     |  |  | $ | 49,945
|                                                                                  |  |                                                            |        |                                           |   |                                         |  |       |   |  |   |       
|Operating cash                                                                    |  |                                                            |        |                                           |   |                                         |  |       |   |  |   | 614   
|                                                                                  |  |                                                            |        |                                           |   |                                         |  |       |   |  |   |       
|Total cash and cash equivalents and short-term investments                        |  |                                                            |        |                                           |   |                                         |  |       |   |  | $ | 50,559
|                                                                                  |  |                                                            |        |                                           |   |                                         |  |       |   |  |   |       

Note 7. Stockholders Equity

2007 Stock Plan

During the six months ended June 30, 2010, the Company granted options to purchase a total of 944,539 shares of the Companys
common stock to employees and officers with a fair value of $4,361,000 the amount of which is expected to be amortized through 2014. Employees were granted 642,500 shares of the Companys common stock with a fair value of $3,027,000, and
officers were granted 302,039 shares of the Companys common stock with a fair value of $ 1,334,000.

Of the 302,039
options granted to officers during the six months ended June 30, 2010, options to purchase a total of 22,039 and 280,000 shares were granted to executive officers as part of their 2009 bonus consideration and as stock option grants,
respectively. The fair value of these 22,039 options was $97,000 and was expensed during the six months ended June 30, 2010 as these options were vested in full upon grant. The fair value of the 280,000 options granted was $1,237,000 is
expected to be amortized through 2014.

For the six months ended June 30, 2010, 23,000 shares under the 2007 Stock Plan
were exercised and 20,000 shares were issued under the 2007 Employee Stock Option Plan.

Non cash stock based compensation
expenses included in operating expenses for the three and six months ended June 30, 2010 and June 30, 2009 were as follows (in thousands):



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|                                             |  |                            |     |                         |   |      |  |      |       |  |   |    
|-------------------------------------------- |  | -------------------------- | --- | ----------------------- | - | ---- |  | ---- | ----- |  | - | ---
|                                             |  | Three MonthsEndedJune 
30, |     | Six MonthsEndedJune 30,
|                                             |  | 2010                       |     | 2009                    |   | 2010 |  | 2009
|Research and development expenses            |  | $                          | 174 |                         | $ | 189  |  | $    | 326   |  | $ | 448
|Selling, general and administrative expenses |  |                            | 378 |                         |   | 201  |  |      | 800   |  |   | 449
|                                             |  |                            |     |                         |   |      |  |      |       |  |   |    
|Total                                        |  | $                          | 552 |                         | $ | 390  |  | $    | 1,126 |  | $ | 897
|                                             |  |                            |     |                         |   |      |  |      |       |  |   |    

Note 8. Commitments and Contingencies

The Company has issued non-cancellable purchase orders to third party manufacturers of Qutenza and NGX-1998 for manufacturing, stability
and related services including reimbursable amounts from Astellas for the supply of Qutenza based on the Astellas Agreement. These purchase orders totaled approximately $2,550,000 as of June 30, 2010 and included approximately $930,000 of
commitments related to supply of Qutenza to Astellas, approximately $755,000 related to supply of saleable product for the U.S. market, approximately $615,000 for stability and related services and approximately $250,000 for NGX-1998 related product
and services. The Company will record these amounts in its financial statements when title to the applicable materials has transferred to the Company.

Note 9. Long Term Obligations

On April 30, 2010, the Company entered into a Financing Agreement (the Financing Agreement) with Cowen Healthcare Royalty
Partners, L.P., a limited partnership organized under the laws of the State of Delaware (Cowen Royalty). Under the terms of the Financing Agreement, the Company borrowed $40,000,000 from Cowen Royalty (the Borrowed Amount)
and the Company agreed to repay such Borrowed Amount together with a return to Cowen Royalty, as described below, out of royalty, milestone, option and certain other payments (collectively, Revenue Interest) that the Company may receive
under the Astellas Agreement or a replacement licensee, as a result of commercializing the Companys product, Qutenza, in the Licensed Territory, including payments that Astellas may make to the Company to maintain its option to commercialize
NGX-1998 in the Licensed Territory.

Under the Financing Agreement, the Company is obligated to pay to Cowen Royalty:



| |  |  | All of the Revenue Interest payments due to the Company under the Astellas Agreement, until Cowen Royalty has received $90 million of Revenue Interest
payments; and
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | 5% of the Revenue Interest payments due to the Company under the Astellas Agreement for Revenue Interests received by Cowen Royalty over $90 million
and until Cowen Royalty has received $106 million of Revenue Interest payments.
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

The Company also has the
option to pay a prepayment amount to terminate the Financing Agreement at the Companys election at any time or in connection with a change of control of the Company. Such amount is set at a base amount of $76 million (or $68 million if it is
being exercised in connection with a change of control), or, if higher, an amount that generates a specified internal rate of return on the Borrowed Amount as of the date of prepayment, in each case reduced by the Revenue Interest payments received
by Cowen Royalty up to the date of prepayment.



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The obligation of the Company to pay Revenue Interests during the term of the Financing
Agreement is secured by rights that the Company has to Revenue Interests under the Astellas Agreement, and by intellectual property and other rights of the Company to the extent necessary or used to commercialize products covered by the Astellas
Agreement in the Licensed Territory.

Unless terminated earlier pursuant to a prepayment, the Financing Agreement also
terminates on the earlier of:



| |  |  | The time when Cowen Royalty has received at least $106 million of Revenue Interest payments; or
| | - |  | -----------------------------------------------------------------------------------------------



| |  |  | The maturity date, which is the latest to occur of 10 years following the first commercial sale of Qutenza in the Licensed Territory or the last to
expire of any patents or regulatory exclusivity covering the products commercialized under the Astellas Agreement in the Licensed Territory.
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

If Cowen Royalty has not received Revenue Interest payments totaling at least $40,000,000 by the maturity date, the Company will be
obligated to pay to Cowen Royalty the difference between such amount and the Revenue Interests paid to Cowen Royalty under the Financing Agreement up to such date.

In addition, in the event of the Companys default under the Financing Agreement, the Company is obligated to pay to Cowen the
borrowed amount together with interest accrued thereon from the effective date of the Financing Agreement, to the date of repayment at a rate equal to the lesser of the 19% rate of interest or the maximum rate permitted by law, Revenue Interest
payments received by Cowen Royalty.

The upfront cash payment of $40,000,000 less the discount of $494,000 in cost
reimbursements paid to Cowen Royalty was recorded as Long term obligation along with the related long term interest payable of $597,000 as of June 30, 2010. Based upon estimated future payments expected under the Financing Agreement, the
Company determined the interest expense by using the effective interest method. The best estimate of future payments was based upon returning to Cowen Royalty an internal rate of return of 19% through Revenue Interest payments. Due to the
application of the effective interest method and the total expected payments, the Company recorded interest expense of approximately $1,277,000 of which no amount was allocated to the principal amount. The Company did not make any payments to Cowen
Royalty for the three months ended June 30, 2010. The accrued interest on the Long term debt obligation is presented on the condensed consolidated balance sheet as of June 30, 2010 in two components, the Long term obligation-current
portion, which totals $680,000 and the remaining $597,000 is included in Long term obligation.

The Company capitalized
$309,000 of debt issuance costs related to the agreement which are being amortized over the term of the related debt using the effective interest method. At June 30, 2010, the unamortized debt issuance costs were $301,000 and are included in
other assets on the Companys condensed consolidated balance sheet. The Company is accreting the discount of $494,000 to interest expense over the term of the related debt, using the effective interest method.

The estimated fair value of the Long term obligation was $41.2 million as of June 30, 2010. The fair value of the Long term
obligation approximates the carrying amount as presented on the condensed consolidated balance sheet as at June 30, 2010.



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|ITEM 2. | MANAGEMENTS DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
|------- | -------------------------------------------------------------------------------------

This discussion and analysis should be read in conjunction with our financial statements and accompanying notes included elsewhere in
this report. Operating results are not necessarily indicative of results that may occur in future periods.

This report
contains forward-looking statements that are based upon current expectations within the meaning of the Private Securities Reform Act of 1995. We intend that such statements be protected by the safe harbor created thereby. Forward-looking statements
involve risks and uncertainties and our actual results and the timing of events may differ significantly from the results discussed in the forward-looking statements. Examples of such forward-looking statements include, but are not limited to,
statements about or relating to:



| |  |  | Our plans with regard to our sales efforts for
Qutenza® in the United States and the plans of Astellas Pharma Europe Ltd., or Astellas, for commercialization
of Qutenza pursuant to the terms of the Distribution, Marketing Agreement and License Agreement or the Astellas Agreement;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the sufficiency of existing resources to fund our operations through at least the next twelve months;
| | - |  | -----------------------------------------------------------------------------------------------------



| |  |  | our distribution and sales strategies including our plans for sales, marketing and manufacturing;
| | - |  | -------------------------------------------------------------------------------------------------



| |  |  | efforts to expand the scope of indications in which our capsaicin-based product candidates are approved and may be marketed;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------



| |  |  | the scope and size of research and development efforts and programs, including with respect to anticipated development of NGX-1998 and additional
product candidates;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | expected timing of initial enrollment for a planned Phase 2 clinical trials for NGX-1998;
| | - |  | -----------------------------------------------------------------------------------------



| |  |  | the potential benefits of, and markets for, our product candidates;
| | - |  | -------------------------------------------------------------------



| |  |  | losses, costs, expenses, expenditures and cash flows;
| | - |  | -----------------------------------------------------



| |  |  | estimates or expectations upon which we base our revenue recognition;
| | - |  | ---------------------------------------------------------------------



| |  |  | potential competitors and competitive products;
| | - |  | -----------------------------------------------



| |  |  | patents and our and others intellectual property; and
| | - |  | ------------------------------------------------------



| |  |  | expected future sources of revenue and capital.
| | - |  | -----------------------------------------------

We undertake no obligation to, and expressly disclaim any obligation to, revise or update the forward-looking statements made herein or
the risk factors whether as a result of new information, future events or otherwise. Forward-looking statements involve risks and uncertainties, which are more fully described in the section of this quarterly report entitled Risk
Factors, including, but not limited to, those risks and uncertainties relating to:



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##### Table of Contents

| |  |  | our ability to build and manage an effective sales force and supporting infrastructure to successfully commercialize Qutenza;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------



| |  |  | physician or patient reluctance to use Qutenza including the reluctance due to inadequate or inconvenient payer coverage for Qutenza and for the
procedure to administer Qutenza;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our ability to obtain adequate pricing and sufficient insurance coverage and reimbursement;
| | - |  | -------------------------------------------------------------------------------------------



| |  |  | our inability to obtain additional financing if necessary;
| | - |  | ----------------------------------------------------------



| |  |  | changing standards of care and the introduction of products by competitors or alternative therapies for the treatment of indications we target;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | difficulties or delays in development, testing, obtaining regulatory approval for, and undertaking production and marketing of our drug candidates;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Astellas ability and efforts to effectively commercialize Qutenza in the territory covered by the Astellas Agreement;
| | - |  | ----------------------------------------------------------------------------------------------------------------------



| |  |  | the uncertainty of protection for our intellectual property, through patents, trade secrets or otherwise; and
| | - |  | -------------------------------------------------------------------------------------------------------------



| |  |  | potential infringement of the intellectual property rights or trade secrets of third parties.
| | - |  | ---------------------------------------------------------------------------------------------

The following discussion should be read in conjunction with the section of this quarterly report entitled Risk Factors.

Overview

We are a biopharmaceutical company focused on developing and commercializing novel pain management therapies. We are assembling a
portfolio of pain management product candidates based on known chemical entities to develop innovative new therapies that we believe may offer substantial advantages over currently available treatment options. Our initial focus is on the management
of chronic peripheral neuropathic pain conditions.

Our first commercial product, Qutenza is a localized dermal delivery
system designed to treat certain neuropathic pain conditions and was approved by the U.S. Food and Drug Administration, or FDA, in November 2009 for the management of neuropathic pain associated with postherpetic neuralgia, or PHN. Qutenza is
commercially available in the United States through a specialty distribution and specialty pharmacy network supported by our own sales force.

In May 2009, Qutenza received a Marketing Approval or MA, in the European Union for the treatment of peripheral neuropathic pain in
non-diabetic adults, either alone or in combination with other medicinal products for pain. In June 2009, we entered into the Astellas Agreement, under which we granted an exclusive license to commercialize Qutenza in the European Economic Area,
which includes the 27 countries of the European Union, Iceland, Norway, and Liechtenstein as well as Switzerland, certain countries in Eastern Europe, the Middle East and Africa, which we refer to as the Licensed Territory. In the second
quarter of 2010, Astellas made Qutenza commercially available in Germany, Austria and the United Kingdom (UK) with initial launch activities focused on intensive site training. Astellas has informed us of their plans to launch Qutenza into
additional European markets during the second half of 2010, to increase their presence in the pain specialist arena. We will record royalty revenue based upon Astellas reported net



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##### Table of Contents

sales of Qutenza in the Astellas Territory. The timing of recording royalty revenue from Astellas may lag by as much as a quarter due to timing of Astellas reporting such royalties to us.

We are currently evaluating the nature, scope and timing of continued development of Qutenza to support the potential for
label expansion in the United States. Areas of potential focus for label expansion include HIV-distal sensory neuropathy, (also known as HIV-associated neuropathy) or HIV-DSP, painful diabetic neuropathy, or PDN, and potentially other neuropathic
pain indications. Our plans for continued Qutenza development efforts with respect to PDN are being evaluated in light of Astellas plans for market support studies and satisfaction of the European Medicines Agency, or EMA, post-approval
regulatory commitments.

Our lead product candidate, NGX-1998 is a topical liquid formulation of capsaicin for potential use
in neuropathic pain conditions and has been evaluated in three Phase 1 studies. We have begun our initial preparation for the Phase 2 clinical program, with patient enrollment expected to occur in the last quarter of 2010.

We also have an early stage development pipeline which consists of:



| |  |  | NGX-1576, NGX-9674 and NGX-5752, prodrugs of acetaminophen for potential use in acute pain, including traumatic pain, post-surgical pain and fever; and
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | NGX-6052, an opioid prodrug for potential use in chronic pain indications.
| | - |  | --------------------------------------------------------------------------

These other product candidates are in the pre-clinical stage of development and may or may not be the subject of further development in
2010 or beyond. We are currently seeking development partners for our acetaminophen and opioid prodrug product candidates.

To
date we have funded our operations primarily by selling equity securities, establishing debt facilities and through a collaboration agreement with Astellas. We have incurred significant losses since our inception. We had cash, cash equivalents and
short-term investments totaling $67.9 million at June 30, 2010 and during the six months ended June 30, 2010 we used $21.3 million in operating activities. We expect to continue to incur annual operating losses over the next several years
and the rate of those losses is expected to increase in the near term as we continue our sales and marketing efforts of Qutenza in the United States. Additionally, we have resumed development of NGX-1998 and may potentially resume development of our
other product candidates. On April 30, 2010, we entered into a $40 million Financing Agreement with Cowen Healthcare Royalty Partners, L.P., or Cowen Royalty. The agreement creates a debt obligation that will be repaid through and secured by
royalties and future milestone payments payable to us by Astellas. We believe this structure provides us with capital to continue executing our operating plan. We anticipate that our existing cash and investments will be sufficient to meet our
projected operating requirements through at least the next twelve months.

Critical Accounting Policies and Significant Judgments and
Estimates

As of the date of the filing of this quarterly report, there have been no material changes to our critical
accounting policies during the six months ended June 30, 2010 compared to those discussed in our 2009 Form 10-K, filed on March 19, 2010, other than those discussed below:



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Product revenue

In April 2010, we made Qutenza commercially available to our specialty distributor and specialty pharmacy customers, in the United States.
Based on our agreements with our customers, the customers take title to the product upon shipment and have the right to return damaged product, expired or short dated product. As Qutenza is new to the marketplace, we are currently assessing the flow
of product through its distribution channel. Since current authoritative guidance precludes revenue recognition until a reasonable estimate of returns can be made, we are deferring the recognition of revenues, and related product costs, on Qutenza
product shipments to speciality distributor and speciality pharmacy customers until an estimate of returns can be made. However, we are recognizing Qutenza product revenues, and related product costs, at the time the product is shipped to physicians
for administration to patients. Additionally, as part of the launch program, we offered extended payment terms to certain customer classes and we expect to recognize the related revenue upon expiration of such extended payment terms. We anticipate
that revenues will be reduced for estimated discounts and allowances based on the contractual terms of sales, however with regard to revenue recognized in the second quarter of 2010, no adjustments for discounts or allowances were required.

Cost of goods sold

Cost of goods sold includes costs to procure, manufacture and distribute Qutenza including certain fixed costs incurred in the
distribution channel as well as royalties paid to The Regents of the University of California, or UC, and LTS Lohmann Therapie-Systeme AG or LTS pursuant to our agreements with such entities. Costs associated with the manufacture of Qutenza prior to
FDA approval were previously expensed as research and development in the period incurred. Cost of goods sold associated with deferred product revenue will be deferred and recognized in the same period as the associated product revenue.

Inventory

Inventories are determined at the lower of cost or market value with cost determined under the specific identification method. Inventories
consist of raw materials, work in process and finished goods. Raw materials include certain starting materials used in the production of the active pharmaceutical ingredient of Qutenza. Work in process includes the bulk inventory of the active
pharmaceutical ingredient, patches and cleansing gel of Qutenza that are in the process of being manufactured by our third party contract manufacturers or have completed manufacture and are awaiting final packaging, including related internal labor
and overhead costs. Finished goods include the final packaged kits that contain the Qutenza patch and cleansing gel and that are ready for commercial sale. Qutenza received FDA approval for sale in the United States during the fourth quarter of
2009, and accordingly, all product manufacturing costs incurred subsequent to FDA approval in the U.S. market were capitalized to inventory. Such costs incurred prior to FDA approval had been recorded as research and development expense in the
accompanying condensed consolidated statement of operations. As a result, inventory balances for the next few quarters may reflect a lower average per unit cost. On a quarterly basis, Management analyzes its inventory levels and writes down
inventory that has become obsolete, inventory that has a cost basis in excess of the expected net realizable value and inventory that is in excess of expected requirements based upon anticipated product revenues.

Long term obligations

Under our Financing Agreement with Cowen Royalty, we recorded the upfront cash payment of $40.0 million, less the $494,000 in cost
reimbursements paid to Cowen Royalty as a Long term obligation. Based upon our best estimate of future Revenue Interest payments, interest expense was calculated using the effective interest method. Our best estimate of future Revenue Interest
payments was based upon returning to Cowen Royalty an internal rate of return of 19% through future Revenue Interest receipts from Astellas.

Results of Operations

In November, 2009, we received marketing approval from the FDA for Qutenza for the management of neuropathic pain associated with PHN. In
April, 2010, we launched Qutenza in the United States. . We are marketing and selling Qutenza in the U.S. through a team of approximately 40 sales professionals. We have established a distribution network that will allow health care providers to
access Qutenza through specialty distributors and specialty pharmacies. We are marketing Qutenza to top physicians who treat PHN patients in private practices, hospitals, military treatment facilities and veterans associations. Our focus requires
considerable time and effort to educate and train physician offices prior to their initial Qutenza treatments. At



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June 30, 2010, gross deferred product revenues totaled $275,000 which is reported net of associated deferred cost of goods sold of $19,000.

We commenced recording Collaborative revenue for the upfront payments from Astellas in 2009 when the upfront payment of $48.8 million
received from Astellas became nonrefundable as a result of our transfer of the Qutenza MA to Astellas. As of June 30, 2010, $43.3 million is the remaining deferred collaborative revenue which will be recognized on a straight line basis over the
remaining service period of the joint steering committee, which we estimate will expire in June 2016. Under our Supply Agreement with Astellas, we are obligated to supply product, at our cost, until such time as Astellas establishes its own supply
relationship.

In the second quarter of 2010, Astellas made Qutenza commercially available in Germany, Austria and the United
Kingdom (UK) with initial launch activities focused on intensive site training. Astellas has informed us of their plans to launch Qutenza into additional European markets during the second half of 2010, to increase their presence in the pain
specialist arena. We will record royalty revenue based upon Astellas reported net sales of Qutenza in the Licensed Territory. The timing of recording royalty revenue from Astellas will lag by as much as a quarter due to the timing of
Astellas reporting such royalties to us.

Our research and development expenses consist of internal and external costs. Our
internal costs are primarily employee salaries and benefits, contract employee expense, non-cash stock compensation expense, allocated facility and other overhead costs associated with the ongoing support of Qutenza in approved indications,
activities related to development of Qutenza in potential additional indications and activities related to other product candidates. Our external costs are primarily expenses related to the development of product candidates including formulation
development, manufacturing process development, non-clinical studies, clinical trial costs, such as the cost of clinical research organizations and clinical investigators, milestone payments to our licensors in connection with the use of certain
intellectual property, and costs associated with preparation and filing of regulatory submissions. Additionally, prior to FDA approval of Qutenza, external and internal costs related to manufacturing of Qutenza were recorded to research and
development expense in the period incurred.

The process of conducting preclinical testing and clinical trials necessary to
obtain marketing approvals in the United States and other regions is costly and time consuming. The probability of success for each product candidate and clinical trial may be affected by a variety of factors, including, among others, patient
enrollment, manufacturing capabilities, successful clinical results, our funding, and competitive and commercial viability. As a result of these and other factors, we are unable to determine the duration and completion costs of current or future
clinical stages of our product candidates or when or to what extent we will generate revenues from commercialization and sale of any of our unapproved product candidates. Currently we are preparing for the entry of NGX-1998 into Phase 2 clinical
development. NGX-1998 is our most advanced product candidate and costs to complete development of NGX-1998 could be significant. Pursuant to Astellas Agreement, we might receive future option payments related to this program at Astellas
election. Further, if Astellas exercises its option to license NGX-1998, Astellas would be responsible for 50% of the costs incurred for Phase 3 clinical development.

We anticipate that our overall research and development expenses, excluding non-cash stock-based compensation expense, may increase in
the second half of 2010 and during 2011, as we expect to resume development activities for NGX-1998 including initiating a Phase 2 study and potentially conducting certain activities related to other non-approved indications for Qutenza.

Our selling, general and administrative expenses consist primarily of salaries and benefits, including those of our sales, marketing,
commercial operations and administrative functions such as finance, human



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resources, legal, medical affairs and information technology. Additionally, selling, general and administrative expenses include marketing expenses, commercialization costs, pharmacovigilance
costs and costs associated with our status as a public company and patent costs. In addition, general and administrative expenses include allocated facility, basic operational and support costs and insurance costs. We anticipate that our selling,
general and administrative expenses will increase significantly during 2010 and over the next several years as a result of our commercialization of Qutenza. These increases are likely to be attributable to increasing marketing activities, costs to
maintain and potentially grow our U.S. sales force and infrastructure costs to support commercial operations, as well as the need to add additional personnel in all of the key functional areas that support growth of our general operations, including
accounting and finance, legal and human resources.

Comparison of the Three Months Ended June 30, 2010 and 2009



|                                             |  |                                    |        |   |          |   |        |            |  |       |            |  |      |   
|-------------------------------------------- |  | ---------------------------------- | ------ | - | -------- | - | ------ | ---------- |  | ----- | ---------- |  | ---- | --
|                                             |  | Three Months EndedJune 30,         |        |   | Increase |   |        | %Increase  | 
|                                             |  | 2010                               |        |   | 2009     |   |        | (Decrease) |  |       | (Decrease) | 
|                                             |  | (in thousands, except percentages) |       
|Product revenue                              |  | $                                  | 33     |   |          | $ |       |            |  | 33    |            |  | 100  | % 
|Collaborative revenue                        |  |                                    | 2,051  |   |          |   |       |            |  | 2,051 |            |  | 100  | % 
|Cost of goods sold                           |  |                                    | (45    | ) |          |   |       |            |  | 45    |            |  | 100  | % 
|Research and development expenses            |  |                                    | (2,745 | ) |          |   | (2,780 | )          |  | (35   | )          |  | (1   | %)
|Selling, general and administrative expenses |  |                                    | (8,271 | ) |          |   | (2,605 | )          |  | 5,666 |            |  | 218  | % 
|Interest income                              |  |                                    | 22     |   |          |   | 11     |            |  | 11    |            |  | 100  | % 
|Interest expense and other                   |  |                                    | (1,278 | ) |          |   | (58    | )          |  | 1,220 |            |  | 2103 | % 

Product
Revenue.Since the U.S. launch of Qutenza on April 5, 2010, we recorded sales of Qutenza to its specialty distributor and specialty pharmacy customers totaling $308,000, of which $33,000 was recorded as Qutenza revenue for the second
quarter 2010. Due to limited history of product returns and launch-related programs, including extended payment programs, we are deferring revenue recognition of the remaining $275,000 in Qutenza sales to these customers. Of the deferred revenue
total, $122,000 was sold through to end user customers (i.e. physicians, clinics and hospitals) and the deferral has resulted from launch related extended payment terms, while $153,000 represents deferral of sales into our distribution channel,
recognition of which will be based upon ultimate sales of those units to end user customers. Deferred revenue is reported net of associated cost of goods sold on the Companys condensed consolidated balance sheet as at June 30, 2010.

Collaborative Revenue. Collaborative revenue of $2.1 million recorded in the three months ended June 30, 2010
consisted of $1.9 million of the amortization of upfront payments received pursuant to the Astellas Agreement as well as $0.2 million of Collaborative revenue under our Supply Agreement with Astellas. Under our Supply Agreement with Astellas, we are
obligated to supply product, at a contractually agreed upon cost for materials and our related labor and overhead, until such time as Astellas establishes its own supply relationship with suppliers. The majority of this revenue results from our
having expensed certain product costs in periods prior to receiving regulatory approval and subsequently selling that product to Astellas during this quarter. Going forward we do not expect to make a significant net profit or loss on sales of
product to Astellas.

Cost of goods sold. Cost of goods sold totaled $45,000 for the three months ended June 30,
2010. Cost of goods sold includes the cost of product sold, costs associated with services provided by our third-party logistics partner for managing the shipping, billing and other administrative functions associated with



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the distribution channel and also includes royalty obligations due to the Companys intellectual property licensors, UC and LTS. We recognize costs associated with our third party logistics
provider in the period in which those costs are incurred, however costs to manufacture product and royalty obligations due to third parties are deferred and recognized in the period in which the associated revenue is recognized. During the second
quarter of 2010, we recognized cost of goods in excess of our product revenue as a result of the fixed costs associated with the services of our third party logistics provider. Costs associated with the manufacture of Qutenza prior to regulatory
approval were previously expensed in the period in which those costs were incurred.

Research and Development expenses.
Research and development expenses decreased $0.1 million, or 1%, to $2.7 million for the three months ended June 30, 2010 from $2.8 million for the same period in 2009. During both periods, we were engaged primarily in activities supported by
our internal personnel including the management of regulatory processes to gain approval in both Europe and the United States during 2009 and 2010 and the maintenance of the New Drug Application or NDA in the United States for Qutenza. Further,
whereas in 2009 we were engaged in conducting a small clinical study at the request of the FDA in support of our NDA, in 2010 we were engaged in the planning and preparatory work associated with the initiation of a Phase 2 study for our lead product
candidate, NGX-1998. Over the remainder of this year and into 2011, we expect that our research and development costs may increase due to a planned Phase 2 study with NGX-1998 as well as non-clinical and formulation work associated with this
program.

Selling, General and Administrative expenses. Selling, general and administrative expenses increased $5.7
million, or 218%, to $8.3 million for the three months ended June 30, 2010, from $2.6 million for the same period in 2009. This increase was due in large part to the commercial launch of Qutenza in the United States in April, 2010.
Specifically, the increases included $2.6 million in costs associated with our sales and commercial operation organization including salary and related expenses; $2.1 million increase in expenses for marketing materials development and other launch
related marketing costs; $0.5 million in costs due to an increase in general and administrative salary and related expenses temporary help and consultants, professional service fees and other public company costs; $0.5 million of costs associated
with our medical affairs organization including salary and related expenses; $0.2 million of professional services related to our reimbursement activities in support of the commercial launch of Qutenza, and a $0.2 million increase in stock-based
compensation costs due to the granting of options to employees and officers. These increases were offset by a decrease in legal fees of $ 0.4 million primarily due to fees incurred in the 2009 period associated with the Astellas Agreement.

Interest expense.Interest expense increased $1.2 million, or 2,103%, to $1.3 million for the three months ended
June 30, 2010 from $0.1 million for the same period in 2009. The 2010 increase was primarily due to interest on the $40 million Long term obligation related to the Financing Agreement entered into with Cowen Royalty, in May 2010.

Comparison of the Six Months Ended June 30, 2010 and 2009



|                                             |  |                                    |         |   |          |   |        |            |  |        |            |  |     |   
|-------------------------------------------- |  | ---------------------------------- | ------- | - | -------- | - | ------ | ---------- |  | ------ | ---------- |  | --- | --
|                                             |  | Six Months EndedJune 30,           |         |   | Increase |   |        | %Increase  | 
|                                             |  | 2010                               |         |   | 2009     |   |        | (Decrease) |  |        | (Decrease) | 
|                                             |  | (in thousands, except percentages) |        
|Product revenue                              |  | $                                  | 33      |   |          | $ |       |            |  | 33     |            |  | 100 | % 
|Collaborative revenue                        |  |                                    | 3,837   |   |          |   |       |            |  | 3,837  |            |  | 100 | % 
|Cost of goods sold                           |  |                                    | (45     | ) |          |   |       |            |  | (45    | )          |  | 100 | % 
|Research and development expenses            |  |                                    | (4,868  | ) |          |   | (5,106 | )          |  | (238   | )          |  | (5  | %)
|Selling, general and administrative expenses |  |                                    | (17,078 | ) |          |   | (4,794 | )          |  | 12,284 |            |  | 256 | % 



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|                           |  |        |   |  |      |   |  |        |   |  |     |   
|-------------------------- |  | ------ | - |  | ---- | - |  | ------ | - |  | --- | --
|Interest income            |  | 29     |   |  | 45   |   |  | (16    | ) |  | (36 | %)
|Interest expense and other |  | (1,305 | ) |  | (177 | ) |  | (1,128 | ) |  | 637 | % 

Product
Revenue.Since the U.S. launch of Qutenza on April 5, 2010, we recorded sales of Qutenza to its specialty distributor and specialty pharmacy customers totaling $308,000, of which $33,000 was recorded as Qutenza revenue for six months ended
June 30, 2010. Due to limited history of product returns and launch-related programs, including extended payment programs, we are deferring revenue recognition of the remaining $275,000 in Qutenza sales to these customers. Of the deferred
revenue total, $122,000 was sold through to end user customers (i.e. physicians, clinics and hospitals) and the deferral has resulted from launch related extended payment terms, while $153,000 represents deferral of sales into our distribution
channel, recognition of which will be based upon ultimate sales of those units to end user customers. Deferred revenue is reported net of associated cost of goods sold on our condensed consolidated balance sheet as at June 30, 2010.

Collaborative Revenue. Collaborative revenue of $3.8 million recorded in the six months ended June 30, 2010 consisted of the
amortization of upfront payments received pursuant to the Astellas Agreement as well as $0.2 million of Collaborative revenue under our Supply Agreement with Astellas. Collaborative revenue under the Supply Agreement resulted from a difference
between the carrying cost of supply sold to Astellas and the contractual transfer price for those supplies. Under our Supply Agreement with Astellas, we are obligated to supply product, at a contractually agreed upon cost for materials and our
related labor and overhead, until such time as Astellas establishes its own supply relationship with suppliers.

Cost of
goods sold.Cost of goods sold totaled $45,000 for the six months ended June 30, 2010. Cost of goods sold includes the cost of product sold, costs associated with services provided by our third-party logistics partner for managing the
shipping, billing and other administrative functions associated with the distribution channel and also includes royalty obligations due to the Companys intellectual property licensors, UC and LTS. We recognize costs associated with our third
party logistics provider in the period in which those costs are incurred, however costs to manufacture product and royalty obligations due to third parties are deferred and recognized in the period in which the associated revenue is recognized.
During the six months ended June 30, 2010, we recognized cost of goods in excess of our product revenue as a result of the fixed costs associated with the services of our third party logistics provider. Costs associated with the manufacture of
Qutenza prior to regulatory approval were previously expensed in the period in which those costs were incurred.

Research and Development expenses. Research and development expenses decreased $0.2 million, or 5%, to $4.9 million for the six
months ended June 30, 2010 from $5.1 million for the same period in 2009. The decrease was attributable to a $0.2 million decrease in expenses driven by clinical consulting fees related to our MA and our NDA preparation costs as incurred in
2009. During both periods, we were engaged primarily in activities supported by our internal personnel including the management of regulatory processes to gain approval in both Europe and the United States during 2009 and 2010 the maintenance of the
NDA in the United States for Qutenza. Further, whereas in 2009 we were engaged in conducting a small clinical study at the request of the FDA in support of our NDA, in 2010 we were engaged in the planning and preparatory work associated with the
initiation of a Phase 2 study for our lead product candidate, NGX-1998.

Selling, General and Administrative
expenses.Selling, general and administrative expenses increased $12.3 million, or 256%, to $17.1 million for the six months ended June 30, 2010, from $4.8 million for the same period in 2009. This increase was due in large part to the
commercial launch of Qutenza in the United States in April, 2010. Specifically, the increases included a $4.1 million in costs associated with our sales and commercial operation organization including salary and related expenses; $5.6 million
increase in expenses for marketing materials development and other launch related marketing costs; $0.9 million in costs due to an increase in general and administrative salary and related expenses, temporary help and consultants, professional
service fees and other public company costs; $1.0 million of costs associated with our medical affairs organization including salary and related expenses; $0.4 million of professional services related to our reimbursement activities in support of
the commercial launch of Qutenza,



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and a $0.5 million increase in stock-based compensation costs due to the granting of options to employees and officers. These increases were offset by a decrease in legal fees of $
0.2 million primarily due to fees incurred in the 2009 period associated with the Astellas Agreement.

Interest
expense.Interest expense increased $1.1 million, or 637%, to $1.3 million for the six months ended June 30, 2010 from $0.2 million for the same period in 2009. The 2010 increase was primarily due to interest on the $40 million Long term
obligation related to the Financing Agreement entered into with Cowen Royalty in May 2010.

Liquidity and Capital Resources

Since our inception through June 30, 2010, we have funded our operations primarily by selling equity securities, establishing debt
facilities and through a collaboration agreement with Astellas. In May 2007, we completed an initial public offering of our common stock which, after deducting total expenses including underwriting discounts and commissions and other-offering
related expenses, resulted in net cash proceeds of $38.1 million. In December 2007, we completed the first closing of a private placement of our common stock and warrants resulting in net cash proceeds of $21.5 million and in January 2008, we
completed the second and final closing of this private placement of our common stock and warrants resulting in net cash proceeds of $2.3 million.

As of June 30, 2010, we had approximately $67.9 million in cash, cash equivalents and short-term investments. We also had
working capital, adjusted to exclude the current portion of deferred revenue of approximately $7.2 million, of $64.5 million. Our cash and investment balances are typically held in a variety of interest bearing instruments including corporate bonds,
commercial paper, money market funds and obligations of U.S. government agencies. Cash in excess of immediate operational requirements is invested in accordance with our investment policy primarily with a view to capital preservation and liquidity.
Further, to reduce portfolio risk, our investment policy specifies a concentration limit of 10% in any one issuer or group of issuers of corporate bonds or commercial paper at the time of purchase. Our investment holdings at June 30, 2010
consist solely of U.S. Treasury securities and money market funds consisting of only U.S. Treasury securities.

Net cash used
in operating activities was $21.3 million and $9.2 million in the six months ended June 30, 2010 and 2009, respectively. Net cash used in each of these periods consisted of sales and marketing expenses associated with the launch of first
commercial product, Qutenza, which was launched in April, 2010, infrastructure costs in support of our commercial operations and research and development expenses related to the maintenance of our approved NDA and our other development programs
including the preparation for entering Phase 2 clinical development of NGX-1998. Also included in our cash usage in the six months ended June 30, 2010 was the payment of the sublicense fee due to the UC resulting from the upfront payments
received under the Astellas Agreement and cash payments made for the 2009 Employee Bonus Plan. We anticipate that cash used in operating activities will continue at increased rates over 2009 levels as a result of our commercial activities and
resumption of activities associated with the NGX-1998 development program.

Net cash used in and provided by investing
activities was $32.9 million and $5.5 million for the six months ended June 30, 2010 and 2009, respectively. Investing activities consisted of the purchase and maturity of marketable securities, and the purchase of capital equipment. We expect
that property and equipment expenditures will increase in 2010 due to the capital needs for infrastructure to support our commercial operations.

Net cash provided by and used in financing activities was $39.2 million and $1.8 million in the six months ended June 30, 2010 and
2009, respectively. Financing activities consist of proceeds from the long term obligations related to the Financing Agreement with Cowen Royalty as of June 30, 2010, principal



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repayments on our venture loan financing arrangements in both periods, with the final principal payment made in January 2010, along with the exercise of stock options.

Our future capital uses and requirements depend on numerous forward-looking factors. These factors include but are not limited to the
following:



| |  |  | the success of the commercialization of our products;
| | - |  | -----------------------------------------------------



| |  |  | the costs of establishing and maintaining sales and marketing infrastructure, distribution capabilities and a sales force;
| | - |  | --------------------------------------------------------------------------------------------------------------------------



| |  |  | the scope and cost of commercial activities including, but not limited to, costs associated with pharmacovigilance and medical affairs activities;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the conduct of manufacturing activities;
| | - |  | ----------------------------------------



| |  |  | the costs of carrying out our obligations under our commercial arrangement with Astellas;
| | - |  | -----------------------------------------------------------------------------------------



| |  |  | our ability to establish and maintain strategic collaborations, including licensing and other arrangements that we have or may establish;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the costs and timing of seeking regulatory approvals;
| | - |  | -----------------------------------------------------



| |  |  | the progress of our development programs including the number, size and scope of clinical trials and non-clinical development;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------



| |  |  | the costs involved in enforcing or defending patent claims or other intellectual property rights; and
| | - |  | -----------------------------------------------------------------------------------------------------



| |  |  | the extent to which we acquire or invest in other products, technologies and businesses.
| | - |  | ----------------------------------------------------------------------------------------

At June 30, 2010, we had $67.9 million in cash, cash equivalents and short-term investments. We anticipate that our cash usage for
the remainder of fiscal year 2010 will continue at significantly increased levels as a result of costs related to our commercialization activities for Qutenza and resumption of development activities related to NGX-1998 and potentially our other
development programs. On April 30, 2010, we entered into the Financing Agreement with Cowen Royalty. This agreement created a debt obligation that is to be repaid through and secured in part by royalties and future milestone payments payable to
us by under the Astellas Agreement. A further description of the terms of the Financing Agreement is set forth in Note 9 of our Condensed Consolidated Financial Statements included Part I, Item 1 of this Quarterly Report on Form 10-Q. We
anticipate that our existing cash and investments will be sufficient to meet our projected operating requirements through at least the next twelve months.

To date, we have incurred recurring net losses and negative cash flows from operations. Until we can generate significant cash from our
operations, if ever, we expect to continue to fund our operations with existing cash resources generated from the proceeds of offerings of our equity securities and proceeds from one or more collaboration agreements as well as potentially through
debt financing or the sale of other equity securities. However, we may not be successful in obtaining additional collaboration agreements, or in receiving milestone or royalty payments under those agreements. In addition, we cannot be sure that our
existing cash and investment resources will be adequate or that additional financing will be available when needed or that, if available, financing will be obtained on terms favorable to us or our stockholders. Having



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insufficient funds may require us to delay or potentially eliminate some or all of our development programs, relinquish some or even all rights to product candidates at an earlier stage of
development or negotiate less favorable terms than we would otherwise choose. Failure to obtain adequate financing also may adversely affect the launch of our product candidates or our ability to continue in business. If we raise additional funds by
issuing equity securities, substantial dilution to existing stockholders would likely result. If we raise additional funds by incurring debt financing, the terms of the debt may involve significant cash payment obligations as well as covenants and
specific financial ratios that may restrict our ability to operate our business.

Off Balance Sheet Arrangements

Since inception, we have not engaged in any off balance sheet arrangements, including the use of structured finance, special purpose
entities or variable interest entities.

Contractual Obligations

There have been no material changes to our disclosures set forth in our 2009 Form 10-K, filed on March 19, 2010 regarding contractual
obligations other than as set forth in Note 8 and Note 9 of our financial statements included Part I, Item 1 of this Quarterly Report on Form 10-Q.

Recently Issued and Adoption of New Accounting Standards

In October 2009, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update, or ASU, No. 2009-13, Revenue
Recognition (ASC Topic 605)  Multiple-Deliverable Revenue Arrangements, or ASU 2009-13. This guidance modifies previous guidance for multiple element arrangements by allowing the use of the best estimate of selling price in
the absence of vendor-specific objective evidence, or VSOE, or third party evidence, or TPE, of selling price for determining the selling price of a deliverable. A vendor is now required to use its best estimate of the selling price when VSOE or TPE
of the selling price is not available. In addition, the residual method of allocating arrangement consideration is no longer permitted. ASU 2009-13 is effective for fiscal years beginning on or after June 15, 2010 and early adoption is
permitted beginning in interim periods ended September 30, 2009. We are currently evaluating the impact of adopting ASU 2009-13 on our financial position and results of operations

In April 2010, the FASB issued ASU No. 2010-17, Revenue Recognition-Milestone Method (ASC Topic 605): Milestone Method
of Revenue Recognition, or ASU No. 2010-17 . ASU No. 2010-17 codifies the consensus reached in Emerging Issues Task Force EITF Issue No. 08-9, Milestone Method of Revenue Recognition. ASU No. 2010-17 provides the
amendments to the Codification which provide guidance on defining a milestone and determining when it may be appropriate to apply the milestone method of revenue recognition for research or development transactions. Consideration that is contingent
on achievement of a milestone in its entirety may be recognized as revenue in the period in which the milestone is achieved only if the milestone is judged to meet certain criteria to be considered substantive. Milestones should be considered
substantive in their entirety and may not be bifurcated. An arrangement may contain both substantive and non-substantive milestones, and each milestone should be evaluated individually to determine if it is substantive. ASU No. 2010-17 is
effective on a prospective basis for milestones achieved in fiscal years, and interim periods within those years, beginning on or after June 15, 2010. Early adoption is permitted. If a vendor elects early adoption and the period of adoption is
not expected at the beginning of the entitys fiscal year, the entity should apply ASU No. 2010-17 retrospectively from the beginning of the year of adoption. The adoption of this ASU did not have a material impact on our consolidated financial
position and results of operations or financial condition.



|ITEM 3. | QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
|------- | ----------------------------------------------------------

We believe there has been no material change in our exposure to market risk from that discussed in our Form 10-K filed for the year ended
December 31, 2009.



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Foreign Currency Exchange Rate Risk

Our third party manufacturers including the manufacturer of our active pharmaceutical ingredient, the manufacturer of Qutenza and the
manufacturer of our cleansing gel, are located in countries outside the United States. As a result, we may experience changes in product supply costs as a result of changes in exchange rates between the U.S. dollar and the local currency where the
manufacturing activities occur. In addition, product supply requirements for Qutenza increase, our exposure to foreign currency exchange rates, primarily the Euro, will increase.

Amounts paid to us by Astellas under the Astellas Agreement may be based in Euro or other currency which will then be converted to U.S.
dollars before payment to us. To the extent that these potential receipts are different than our net payable exposure in Euro to our suppliers mentioned above, and to the extent that the timing of these potential payments and receipts differ, we
will have a net receivable or payable exposure in Euro if Qutenza is launched in the European Union and certain other foreign territories.

We currently do not engage in foreign currency hedging activities as the short-term exposure to fluctuations in foreign currency is
relatively small.



|ITEM 4T. | CONTROLS AND PROCEDURES
|-------- | -----------------------

(a) Evaluation of disclosure controls and procedures

Our management evaluated, with the participation and under the supervision of our Chief Executive Officer and our Chief Financial Officer,
the effectiveness of our disclosure controls and procedures as of the end of the period covered by this Quarterly Report on Form 10-Q. Based on this evaluation, our Chief Executive Officer and our Chief Financial Officer have concluded, subject to
the limitations described below, that our disclosure controls and procedures are effective to ensure that information we are required to disclose in reports that we file or submit under the Securities Exchange Act of 1934 is recorded, processed,
summarized and reported within the time periods specified in Securities and Exchange Commission, or SEC, rules and forms, and that such information is accumulated and communicated to management as appropriate to allow timely decisions regarding
required disclosures.

(b) Changes in internal control over financial reporting

We are in the process of implementing an enterprise resource system, or ERP system, to replace our legacy financial accounting system and
are making appropriate changes to internal controls and procedures over financial reporting as the implementation progresses. Other than the changes required by the implementation of the ERP system, none of which materially impaired or significantly
altered the effectiveness of our internal controls and procedures over financial reporting, there were no material changes in our internal controls over financial reporting that occurred during our most recent fiscal quarter that have materially
affected, or are reasonably likely to materially affect, our internal control over financial reporting.

(c) Limitations on
the Effectiveness of Controls

A control system, no matter how well conceived and operated, can provide only reasonable, not
absolute, assurance that the objectives of the controls are met. Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues, if any, within a company have been
detected. Accordingly, our disclosure controls and procedures are designed to provide reasonable, not absolute, assurance that the objectives of our disclosure control system are met.



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PART II. OTHER INFORMATION



|ITEM 1. | LEGAL PROCEEDINGS
|------- | -----------------

We may
be subject to various legal disputes that arise in the normal course of business. These matters may include contract disputes, intellectual property matters, product liability actions, and other matters. We do not know whether we would prevail in
these matters nor can it be assured that a remedy could be reached on commercially viable terms, if at all. Based on currently available information, we do not believe that any of these disputes will have a material adverse impact on our business,
results of operations, liquidity or financial position.



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

You
should consider carefully the risk factors described below, and all other information contained in or incorporated by reference in this Quarterly Report on Form 10-Q before making an investment decision. If any of the following risks actually occur,
they may materially harm our business, financial condition, operating results or cash flows. As a result, the market price of our common stock could decline, and you could lose all or part of your investment. Additional risks and uncertainties that
are not yet identified or that we think are immaterial may also materially harm our business, operating results or financial condition and could result in a complete loss of your investment.

Risks Related to our Business

Our success depends on our ability to effectively commercialize our lead product
Qutenza® (capsaicin) 8% patch.

Our product
Qutenza® (capsaicin) 8% patch, was approved by the FDA in November 2009 for the management of neuropathic pain
associated with PHN. Our commercial success depends on our ability to successfully launch and commercialize Qutenza in the United States. Prior to receiving FDA marketing approval, our commercialization activities were limited and, as a result, many
of our proposed activities to create product awareness or promote market acceptance have only recently been initiated and as such their effect may take some time to be realized, if at all. Although we launched Qutenza in April 2010, we do not yet
know how effective our launch has been or will be, and we may not have an indication of effectiveness for at least the next few quarters, if at all, due to Qutenzas nature as an office administered product, its expected duration of effect
resulting in prolonged periods between product use for a particular patient, and due to our targeted commercialization strategy. Additionally, successful commercialization of Qutenza will depend on a number of factors as further discussed in the
Risk Factors section of this Quarterly Report on Form 10-Q, but include risks related to obtaining adequate reimbursement, our maintaining a qualified sales force, continuing to build infrastructure to support commercial operations and ensuring
sufficient product supply. These activities require significant management attention and financial resources. There can be no assurance that we will be able to sufficiently hire, retain and manage the personnel required to successfully commercialize
Qutenza or that such commercialization will result in significant product sales of Qutenza. If the commercial launch of Qutenza does not meet our expectations, it would significantly and negatively impact our revenue and results of operations.

Our strategy for launching Qutenza in the United States may result in lower than expected near term revenue and could
result in a lower overall revenue potential for Qutenza.

We launched Qutenza with a field sales organization of
approximately 40 representatives and managers. We have tasked the sales force with focusing initially on thought leaders in neuropathic pain as well as U.S. pain specialists with a significant practice in treating PHN patients in major markets in
the United States. Our current approach to launching Qutenza contemplates significant interaction with



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physicians and their practices to facilitate educating staff involved with administering and billing for Qutenza and involves a combination of sales representatives, clinical educators and
reimbursement specialists, all of whom we believe are necessary to allow physicians that use Qutenza to have:



| |  | access to product information and training concerning the proper use and administration of Qutenza; and
|- |  | -------------------------------------------------------------------------------------------------------



| |  | support in seeking reimbursement for Qutenza, as well as the services involved in administering Qutenza.
|- |  | --------------------------------------------------------------------------------------------------------

As a result of this approach, we do not expect to initially market Qutenza to a large number of physicians. While we may expand our sales
and marketing efforts if financial and other resources allow, our initial focused strategy may result in reduced market penetration by Qutenza and lower product revenues in the near term and potentially longer. As a result, our financial results and
our stock price could suffer.

If physicians are not adequately reimbursed for Qutenza or their time and services in
administering Qutenza, it is likely that they will not prescribe Qutenza.

Because many people suffering from PHN are
elderly, in order for Qutenza to be economically viable in the United States, we will need Medicare coverage for Qutenza to have significant market penetration. We understand that all of the Medicare contractors that process claims for Medicare
intend to cover Qutenza under Part B and consequently, we believe that Medicare Part B coverage for Qutenza is in place nationwide. Although Medicare Part B coverage, Medicare policymakers or local contractors may determine that Qutenza is
reasonable and necessary only under limited circumstances. Currently, three contractors have published detailed coverage criteria for Qutenza. If a significant portion of contractors establish restrictive coverage policies for Qutenza, our
business would be harmed, not only because Medicare beneficiaries represent a substantial portion of our target market, but also because Medicares coverage policies would likely affect the determination of many state Medicaid programs and
could influence private payers.

The use of Qutenza is reimbursable under Medicare Part B and the amounts of reimbursement
available to the physician for the treatment procedure are known in most cases, since 9 of the 12 contractors have instructed physicians to bill using established evaluation and management codes that have payment rates associated with them. In the
case of three contractors, the reimbursement amounts for the Qutenza treatment procedure are not yet known because these contractors have requested physicians use a miscellaneous / unlisted code that must be manually priced by the contractor. We
continue to work with local physicians to determine payment amounts in these contractors service areas. If payment rates prove inadequate, such rates could create a significant barrier to physician adoption of Qutenza. Additionally, the
timing and process for physicians to receive reimbursement for use of Qutenza may be a lengthy and uncertain which can also create a barrier for physician adoption of Qutenza. In either case, these factors could serve to seriously limit the market
opportunity for Qutenza.

We also will need to obtain favorable coverage and reimbursement decisions for Qutenza from private
insurers, including managed care organizations. We expect that private insurers will consider the efficacy, cost-effectiveness and safety of Qutenza in determining whether to provide reimbursement for Qutenza and at what level. At this
time, we are aware of two large national plans and two state-based Blue Cross Blue Shield plans that have published coverage criteria for Qutenza. Other private insurers and managed care plans are providing access to Qutenza on a case-by-case basis
while they determine their coverage and reimbursement policies for Qutenza. Obtaining these coverage and reimbursement decisions will be a time consuming process requiring substantial resources and Qutenza patients or providers may not receive
adequate reimbursement from private insurers.

We expect to experience pricing pressures in connection with the sale of
Qutenza and our potential future products, due to the trend toward programs and legislation aimed at reducing healthcare costs, including the recently passed federal healthcare reform legislation as well as the increasing influence of



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managed care organizations. In many foreign countries, particularly the countries of the European Union, the pricing of prescription drugs is subject to direct governmental control and is
influenced by drug reimbursement programs that employ a variety of price control mechanisms. In these countries, pricing negotiations with governmental authorities or reimbursement programs can take 6 to 12 months or longer after the receipt of
regulatory marketing approval for a product. To obtain reimbursement or pricing approval in some countries, we or our collaborators may be required to conduct additional studies, such as a study to evaluate the cost-effectiveness of Qutenza
compared to other currently available therapies. If reimbursement for Qutenza is unavailable, delayed or limited in scope or amount, or if pricing is set at unsatisfactory levels, our business would be materially harmed.

The efforts of government entities and third party payers to contain or reduce the costs of health care may adversely affect our
sales and limit the commercial success of our products.

In certain foreign markets, pricing or profitability of
pharmaceutical products is subject to various forms of direct and indirect governmental control, including the control over the amount of reimbursements provided to the patient who is prescribed specific pharmaceutical products.

In the United States, there have been, and we expect there will continue to be, various proposals to implement similar controls. The
commercial success of our products could be limited if federal or state governments adopt any such proposals. In addition, in the United States and elsewhere, sales of pharmaceutical products depend in part on the availability of reimbursement to
the consumer from third party payers, such as government and private insurance plans. These third party payers are increasingly utilizing their significant purchasing power to challenge the prices charged for pharmaceutical products and seek to
limit reimbursement levels offered to consumers for such products. We expect these third party payers to focus their cost control efforts on our products, especially with respect to prices of and reimbursement levels for products prescribed
outside their labeled indications. In these cases, their efforts may negatively impact our product sales and profitability.

Qutenza and our product candidates may never achieve market acceptance

The commercial success of Qutenza or any other product candidates we develop, if approved, will depend on, among other things, acceptance
by physicians, patients or payors. Market acceptance of, and demand for, any products that we develop and commercialize will depend on many factors, including:



| |  |  | the ability to obtain adequate pricing and sufficient insurance and other third party payer coverage and reimbursement;
| | - |  | -----------------------------------------------------------------------------------------------------------------------



| |  |  | with respect to Qutenza, physicians and patients willingness and ability to accommodate the time necessary for each Qutenza treatment;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------



| |  |  | patient acceptance of the treatment procedure, efficacy or safety of Qutenza;
| | - |  | -----------------------------------------------------------------------------



| |  |  | availability, relative cost and relative efficacy and safety of alternative and competing treatments;
| | - |  | -----------------------------------------------------------------------------------------------------



| |  |  | the effectiveness of our or our collaborators sales, marketing and distribution strategy;
| | - |  | ------------------------------------------------------------------------------------------



| |  |  | publicity concerning our products or competing products and treatments; and
| | - |  | ---------------------------------------------------------------------------



| |  |  | post marketing approval pharmacovigilance or other studies showing safety issues not seen in previous studies.
| | - |  | --------------------------------------------------------------------------------------------------------------



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If Qutenza, or our product candidates if approved, fail to gain market acceptance, we may be
unable to earn sufficient revenue to continue our business.

If we are unable to establish and maintain an effective
sales, marketing and distribution infrastructure or enter into collaborations with partners to perform these functions, we will not be successful in commercializing Qutenza or our product candidates.

In order to successfully commercialize Qutenza or any of our product candidates, we must develop a capable sales, marketing and
distribution infrastructure or enter into collaborations with partners to perform these services for us. The development of a capable sales, marketing and distribution infrastructure requires substantial resources. We have entered into the Astellas
Agreement to market Qutenza in the Licensed Territory, and we may enter into additional partnering or other distribution arrangements for commercialization outside the United States. While we have a direct sales and marketing organization in the
United States for commercializing Qutenza, we may explore the possibilities to enter into collaborations with partners for commercializing Qutenza in the United States. Our establishment of Astellas as our collaboration partner for the Licensed
Territory could limit the potential collaboration options we have for the United States and other countries, or could render potential collaborators less inclined to enter into an agreement with us because of such relationship. Similarly, if we
enter into an agreement with a collaboration partner in the United States, such agreement may negatively impact our ability to seek additional strategic relationships. Factors that may inhibit our efforts to develop an internal sales, marketing and
distribution infrastructure and ability to commercialize our products successfully include:



| |  |  | lack of available financial resources;
| | - |  | --------------------------------------



| |  |  | our inability to recruit and retain adequate numbers of effective sales and marketing personnel;
| | - |  | ------------------------------------------------------------------------------------------------



| |  |  | the inability of sales personnel to obtain prescriber demand for our products;
| | - |  | ------------------------------------------------------------------------------



| |  |  | the lack of complementary products to be offered by sales personnel, which may put us at a competitive disadvantage relative to companies with more
extensive product lines; and
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | unforeseen costs and expenses associated with creating a sales and marketing organization.
| | - |  | ------------------------------------------------------------------------------------------

We also may not be able to enter into collaborations on acceptable terms, if at all, and we may face competition in our search for
partners with whom we may collaborate. If we are not able to build an effective sales, marketing and distribution infrastructure, or collaborate with a partner to perform these functions, we may be unable to commercialize our product candidates
successfully, which would adversely affect our business and financial condition.

Our success will depend, in part, on
the successful efforts of our collaboration partner in the European Union, certain countries in Eastern Europe, the Middle East and Africa.

The success of sales of Qutenza in the Licensed Territory will be dependent on Astellas ability to successfully launch and
commercialize Qutenza pursuant to the Astellas Agreement. The manner in which Qutenza is launched, including the timing of launch in each country of the European Union and the pricing that will be established in each such country, will have a
significant impact on the ultimate success of Qutenza in the European Union, and ultimately the success of the overall commercial arrangement with Astellas. If commercial launch of Qutenza in the Licensed Territory is delayed or prevented, our
revenues will suffer and our stock price will decline. Further, if sales of Qutenza are less than anticipated, our stock price will decline. The outcome of Astellas commercialization efforts could also have an effect on investors
perception of



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potential sales of Qutenza in the United States, which could cause a decline in our stock price if such efforts are unsuccessful.

The Astellas Agreement provides for Astellas to be responsible for conducting certain studies for Qutenza in the European Union, both to
satisfy post-marketing commitments that were made in conjunction with the Qutenza MA in the European Union and to carry out in support of Astellas commercialization plans for Qutenza in the Licensed Territory. The planning and execution of
these studies will be primarily the responsibility of Astellas, and may not be carried out in accordance with our indicated preferences, or may yield results that are detrimental to Astellas sales of Qutenza in the Licensed Territory or
detrimental in our efforts to develop or commercialize Qutenza outside the Licensed Territory, including in the United States. Together with Astellas, we may attempt to design such studies with a view toward having the resulting data be supportive
of other regulatory and commercial efforts in both the European Union and the United States, such as potential label expansion studies that may be carried out with respect to use of Qutenza to treat pain associated with PDN. However, such studies
may have limited or no utility to support such efforts and may negatively impact our revenues.

To date, the only portion of
the Licensed Territory in which regulatory approval for Qutenza has been obtained is the European Economic Area. Other regulatory jurisdictions in the Licensed Territory may require further clinical and manufacturing activities to gain approval for
sales of Qutenza in these countries. There can be no assurance that these activities will be successful and that approval in these countries will be obtained in a timely manner, if at all. Further, there can be no assurance that such clinical or
manufacturing activities will not negatively impact the regulatory processes in the European Economic Area, United States or other markets where regulatory approval of Qutenza may have been obtained or may be in the process of being sought.

The Astellas Agreement requires us to expend resources in support of our commercial relationship with Astellas. Although we
believe that our contractual arrangement with Astellas provides for reimbursement for many of these activities, the time and financial costs of managing such a relationship can be significant and to occur at a time when we are executing the
commercialization of Qutenza in the United States.

The Supply Agreement we entered into in connection with the Astellas
Agreement requires us to supply components of Qutenza to Astellas at the same cost we obtain such components from our third-party manufacturers. Because we have never overseen commercial manufacturing processes and quantities of these components, we
may incur non-reimbursable costs related to manufacturing scale up, quality assurance and release, which could negatively impact our financial results. Such Supply Agreement also provides for Astellas to enter into direct supply relationships with
our current suppliers to replace the need for us to provide Astellas with pass-through supply of Qutenza components. There can be no assurance that the establishment of such separate supply relationships will not negatively impact our ability to
obtain our own supply of Qutenza components in support of our commercialization of Qutenza in the United States or other markets outside the Licensed Territory that we seek to commercialize.

The Astellas Agreement grants to Astellas an option to exclusively license our second generation product, NGX-1998. In connection with
this option, we are required to prepare a development plan for NGX-1998 and achieve certain objectives. After completion of an initial set of objectives, Astellas may make an additional payment to us to retain its option to license NGX-1998 until
further agreed upon development of NGX-1998 has been performed by us. Upon completion of these objectives, Astellas may elect to make a final payment to us in order to exercise its option. If Astellas determines not to make one of these payments,
the option to license NGX-1998 will expire, Astellas will not be required to provide further funding for NGX-1998, and we would be precluded from marketing NGX-1998 in the Licensed Territory for a period of time. If Astellas fails to exercise its
options with respect to NGX-1998, we will be unable to generate revenues from potential sales of NGX-1998 in the Licensed Territory, and our business will be harmed.



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Astellas commercialization of Qutenza in the Licensed Territory may result in lower
levels of income to us than if we marketed Qutenza in the Licensed Territory on our own. Astellas may not fulfill its obligations or commercialize Qutenza as quickly as we would like. We could also become involved in disputes with Astellas, which
could lead to delays in or termination of the Astellas Agreement and time-consuming and expensive litigation or arbitration. If Astellas terminates or breaches its agreement with us, or otherwise fails to complete its obligations in a timely manner,
the chances of successfully developing or commercializing Qutenza in the Licensed Territory would be materially and adversely affected.

We are subject to various regulations pertaining to the marketing of our products.

We are subject to various federal and state laws pertaining to healthcare fraud and abuse, including inducing, facilitating or encouraging
submission of false claims to government programs and prohibitions on the offer of payment or acceptance of kickbacks or other remuneration for the purchase of Qutenza. Specifically, these anti-kickback laws make it illegal for a prescription drug
manufacturer to solicit, offer, or pay any remuneration in exchange for purchasing, leasing or ordering any service or items including the purchase or prescription of a particular drug for which payment may be made under a federal healthcare
program. Because of the sweeping language of the federal anti-kickback statute, many potentially beneficial business arrangements would be prohibited if the statute were strictly applied. To avoid this outcome, the U.S. Department of Health and
Human Services has published regulations  known as safe harbors  that identify exceptions or exemptions to the statutes prohibitions. Arrangements that do not fit within the safe harbors are not automatically deemed to
be illegal, but must be evaluated on a case-by-case basis for compliance with the statute. We seek to comply with anti-kickback statutes and if necessary to fit within one of the defined safe harbors; we are unaware of any violations of
these laws. However, due to the breadth of the statutory provisions and the absence of uniform guidance in the form of regulations or court decisions, there can be no assurance that our practices will not be challenged under anti-kickback or similar
laws. Violations of such restrictions may be punishable by civil or criminal sanctions, including fines and civil monetary penalties, as well as the possibility of exclusion from U.S. federal healthcare programs (including Medicaid and
Medicare). Any such violations could have a material adverse effect on our business, financial condition, results of operations and cash flows.

In addition, the FDA has the authority to regulate the claims we make in marketing our prescription drug products to ensure that such
claims are true, not misleading, supported by scientific evidence and consistent with the labeled use of the drug. Failure to comply with FDA requirements in this regard could result in, among other things, warning letters, suspensions of approvals,
seizures or recalls of products, injunctions against a products manufacture, distribution, sales and marketing, operating restrictions, civil penalties and criminal prosecutions.

We outsource the manufacturing of Qutenza and our other product candidates and accordingly depend on other parties for our
manufacturing operations. If these manufacturers fail to meet our requirements and strict regulatory requirements, Qutenza commercialization efforts and further product development efforts may be negatively affected.

We currently depend on four contract manufacturers as single source suppliers for the components of Qutenza: an intermediate material
used in the synthesis of capsaicin, synthetic capsaicin, the dermal delivery system and the associated cleansing gel. We have entered into long-term commercial supply agreements for these components. In addition we have entered into a long-term
agreement for the assembly of the Qutenza treatment kits in the United States. If relationships with any of these manufacturers is terminated, or if any manufacturer is unable to produce required quantities on a timely basis or at all, our
operations would be negatively impacted and our business harmed.

Reliance on contract manufacturers exposes us to additional
risks, including:



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| |  |  | failure of current and future manufacturers to comply with strictly-enforced regulatory requirements;
| | - |  | -----------------------------------------------------------------------------------------------------



| |  |  | failure to manufacture to our specifications, or to deliver sufficient quantities in a timely manner;
| | - |  | -----------------------------------------------------------------------------------------------------



| |  |  | the possibility that we may terminate a contract manufacturer and need to engage a replacement;
| | - |  | -----------------------------------------------------------------------------------------------



| |  |  | the possibility that current and future manufacturers may not be able to manufacture our product candidates and products without infringing the
intellectual property rights of others;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the possibility that current and future manufacturers may not have adequate intellectual property rights to provide for exclusivity and prevent
competition; and
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | insufficiency of intellectual property rights to any improvements in the manufacturing processes or new manufacturing processes for our products.
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------

Any of these factors could result in insufficient supply of Qutenza to meet demand which would have a
significant impact on our financial results and adversely impact any revenues we may derive from Qutenza. With respect to our product candidates, such factors could result in significant delay or suspension of clinical trials, regulatory
submissions, or receipt of required approvals, all of which could significantly harm our business.

Because our third party
manufacturers operate outside of the United States, and many of the raw materials and the labor that are used to manufacture Qutenza and our product candidates are based in foreign countries, we may experience currency exchange rate risks, even
though, in some instances our contracts are denominated in U.S. dollars. We do not currently engage in forward contracts to hedge this currency risk and as a result, may suffer adverse financial consequences as a result of this currency risk.

Materials used by these entities to manufacture our product candidates originate outside the United States, including certain
materials which may be sourced from China and India. The FDA has increased its diligence with regard to foreign-sourced materials and manufacturing processes. Increased FDA scrutiny of foreign manufacturers could result in delays in product
availability, which could have a negative impact on our business.

Furthermore, because we are currently required to supply
Qutenza to Astellas under the Supply Agreement, the foregoing risks to us related to supply of Qutenza and its components could also harm Astellas ability to commercialize Qutenza in the Licensed Territory. Whether we supply Qutenza to
Astellas or Astellas enters into direct supply arrangements with our suppliers, Astellas ability to generate revenue and in turn our ability to generate royalty and sales-milestone revenue, would be impacted by these foregoing risks relating
to manufacturing.

Qutenza will be subject to ongoing regulatory requirements and may face regulatory or enforcement
action.

Any product candidate for which regulatory approval is obtained is subject to significant review and ongoing
and changing regulation by the FDA, the EMA, and other regulatory agencies. These ongoing regulatory requirements may include, but are not limited to:



| |  |  | obtaining additional post-approval clinical study data;
| | - |  | -------------------------------------------------------



| |  |  | regulatory review of advertising, promotional and education activities for the product;
| | - |  | ---------------------------------------------------------------------------------------



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| |  |  | establishment and monitoring of pharmacovigilance programs; and
| | - |  | ---------------------------------------------------------------



| |  |  | periodic regulatory agency inspections and reviews of third-party manufacturing facilities and processes.
| | - |  | ---------------------------------------------------------------------------------------------------------

Regulatory authorities have recently increased their enforcement efforts including in the areas of advertising, marketing and promotion.
Failure to comply with regulatory requirements may subject us or our collaborative partner to administrative and judicially-imposed sanctions. These may include warning letters, adverse publicity, civil and criminal penalties, injunctions, product
seizures or detention, product recalls, total or partial suspension of production, and refusal to approve pending product marketing applications.

Even if regulatory approval to market a particular product candidate is obtained, the approval could be conditioned on conducting
additional costly post-approval studies or could limit the indicated uses included in such products labeling. For example, our MA in the European Union requires the conduct of certain post-authorization commitments including ongoing
evaluations of safety of Qutenzas use in the labeled indications, as well as clinical evaluation in patients with PDN, although the timing of clinical evaluations in PDN has not yet been determined. These studies may prove difficult and
expensive to complete and their results may identify safety, efficacy or other issues related to Qutenzas use that could hinder or prevent commercialization efforts. Moreover, the product may later be found in the course of these studies or
through our pharmacovigilance programs to cause adverse effects that limit its use, force us or our partner to withdraw it from the market or impede or delay the ability to obtain regulatory approvals in additional countries.

We face potential product liability exposure, and if successful claims are brought against us, we may incur substantial liability
for Qutenza or our product candidates and may have to limit its commercialization.

The use of our product candidates
in clinical trials and the sale of Qutenza expose us to the risk of product liability claims. Product liability claims might be brought against us by consumers, health care providers, pharmaceutical companies or others selling our products. If we
cannot successfully defend ourselves against these claims, we will incur substantial liabilities. Regardless of merit or eventual outcome, liability claims may result in:



| |  |  | decreased demand for our product candidates;
| | - |  | --------------------------------------------



| |  |  | impairment of our business reputation;
| | - |  | --------------------------------------



| |  |  | costs of related litigation;
| | - |  | ----------------------------



| |  |  | substantial monetary awards to patients or other claimants;
| | - |  | -----------------------------------------------------------



| |  |  | loss of revenues;
| | - |  | -----------------



| |  |  | the inability to commercialize our product candidates; and
| | - |  | ----------------------------------------------------------



| |  |  | withdrawal of clinical trial participants.
| | - |  | ------------------------------------------

Although we currently have product liability insurance coverage with limits that we believe are customary and adequate to provide us with
coverage for foreseeable risks associated with our Qutenza commercialization or product candidate development efforts, our insurance coverage may not reimburse us or may be insufficient to reimburse us for the actual expenses or losses we may
suffer. Moreover, in the future,



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we may not be able to maintain insurance coverage at a reasonable cost or in sufficient amounts to protect us against losses due to liability.

Our products are expected to face substantial competition which may result in others discovering, developing or commercializing
products before or more successfully than us or our collaborators.

Qutenza is expected to compete against more
established products marketed by large pharmaceutical companies with far greater name recognition and resources than we or Astellas have. The most directly-competitive currently-marketed products in the United States are Lidoderm, an FDA-approved 5%
lidocaine topical patch for the treatment of PHN marketed by Endo Pharmaceuticals, and Lyrica, an oral anti-convulsant, marketed by Pfizer for use in the treatment of PHN. In addition to these branded drugs, the FDA has approved gabapentin
(Neurontin) for use in the treatment of PHN. Gabapentin is marketed by Pfizer and multiple generic manufacturers, and is the most widely-prescribed drug in the United States for treatment of neuropathic pain. Pfizer has also received FDA approval
for Lyrica for the treatment of PDN, fibromyalgia, epilepsy and general anxiety disorder. Additionally, a number of products that are approved for other diseases are used by physicians to treat PHN.

Competition may become stronger and more direct and products in development, including products that we are unaware of, may compete with
Qutenza. There are many other companies working to develop new drugs and other therapies to treat pain in general and neuropathic pain in particular, including GlaxoSmithKline, Depomed Inc., Novartis AG, UCB S.A, Pfizer, Ortho-McNeil-Janssen
Pharmaceuticals and Eli Lilly. Many of the compounds in development by such companies are already marketed for other indications, such as anti-depressants, anti-convulsants or opioids. In addition, physicians employ other interventional procedures,
such as nerve stimulation or nerve blocks, to treat patients with difficult to treat neuropathic pain conditions. Furthermore, new developments, including the development of other drug technologies and methods of preventing the incidence of disease,
such as vaccines including Zostavax, occur in the biopharmaceutical industry at a rapid pace. Any of these developments may render our products or product candidates obsolete or noncompetitive.

Many of our potential competitors, either alone or together with their partners, have substantially greater financial resources, research
and development programs, clinical trial and regulatory experience, expertise in prosecution of intellectual property rights, and manufacturing, distribution and sales and marketing capabilities than we and Astellas do. As a result of these factors,
our competitors may:



| |  |  | initiate or withstand substantial price competition more successfully;
| | - |  | ----------------------------------------------------------------------



| |  |  | have greater success in recruiting skilled scientific workers from the limited pool of available talent;
| | - |  | --------------------------------------------------------------------------------------------------------



| |  |  | more effectively negotiate third-party licenses and strategic alliances;
| | - |  | ------------------------------------------------------------------------



| |  |  | take advantage of acquisition or other opportunities more readily than we can; and
| | - |  | ----------------------------------------------------------------------------------



| |  |  | develop product candidates and market products that are less expensive, safer, more effective or involve more convenient treatment procedures than our
current and future products.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

The life sciences industry is characterized by rapid technological change. If
we fail to stay at the forefront of technological change our products may be unable to compete effectively.



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We may not be able to maintain orphan drug exclusivity for Qutenza in PHN and HIV-DSP
or obtain orphan designation in additional indications or product candidates.

We rely, in part, on the market
exclusivity afforded orphan drugs for the commercialization of Qutenza in the United States. The FDA has granted us orphan drug status with regard to Qutenza for the management of PHN and as a consequence, Qutenza is entitled to orphan
exclusivitythat is, for seven years, the FDA may not approve any other applications to market the same drug for the same indication, except in very limited circumstances. Additionally, the FDA has granted us orphan drug status for HIV-DSP, an
indication for which we currently do not have an FDA-approved product. We may be unable to obtain orphan drug designations for any additional product candidates or exclusivity for any future product candidates, or our potential competitors may
obtain orphan drug exclusivity for capsaicin-based products competitive with our product candidates in indications other than PHN before we do, in which case we may be excluded from that market for the exclusivity period. In addition, orphan drug
designation previously granted may be withdrawn under certain circumstances. Even if we obtain orphan drug exclusivity for any of our product candidates, we may not be able to maintain it if a competitive product based on the same active compound is
shown to be clinically superior to our product. Although obtaining FDA approval to market a product with orphan exclusivity can be advantageous, there can be no assurance that it would provide us with a significant commercial advantage.

We rely, in part on Hatch-Waxman Act data exclusivity or equivalent regulatory data exclusivity protection in other jurisdictions
for Qutenza.

The Hatch-Waxman Act provides five years of data exclusivity to the first applicant to gain approval of
an NDA under Section 505(b) of the Food, Drug and Cosmetic Act for a new chemical entity. Qutenza has been recognized by the FDA as a new chemical entity and therefore has been granted five year data exclusivity under the Hatch-Waxman Act.
Hatch-Waxman provides data exclusivity by prohibiting abbreviated new drug applications, or ANDAs, and 505(b)(2) applications, which are marketing applications where the applicant does not own or have a legal right of reference to all the data
required for approval, to be submitted by another company for another version of such drug during the exclusivity period. Protection under Hatch-Waxman will not prevent the filing or approval of a full NDA under Section 505(b)(1) for the same
active ingredient, although the applicant would be required to conduct its own adequate and well-controlled clinical trials to demonstrate safety and effectiveness.

Even though Qutenza has been granted five year Hatch-Waxman data exclusivity in the United States and ten-year market exclusivity which
may be extended to eleven-year market exclusivity upon meeting certain criteria and eight-year data exclusivity by the EMA, there can be no assurance that the exclusivity granted will effectively prevent competition, either generic or otherwise.
Such competition could significantly harm our business.

Our fast track designation for development of
Qutenza for management of pain associated with HIV-associated neuropathy may not actually lead to a faster development or regulatory review or approval process.

A product intended for the treatment of a serious or life-threatening condition that demonstrates the potential to address unmet medical
needs for such a condition may be submitted to the FDA for fast track designation. Although we received fast track designation from the FDA for Qutenza for the treatment of HIV-DSP, there is no assurance that, if we decide to file an NDA
for Qutenza in HIV-DSP, that we will experience a faster development process, review or approval, compared to conventional FDA standards, or that the product will be approved for such indication at all. Further, the FDA may require two successful
Phase 3 studies in HIV-DSP to support an approval for that indication. We are currently evaluating whether to file for approval with our existing data, conduct an additional study in HIV-DSP, or not seek an extension of our existing approved
indication to include HIV-DSP. Depending on the course we decide, we may find



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no benefit in the fast track designation afforded the HIV-DSP indication. The FDA may also withdraw our fast track designation if it believes that the designation is no longer supported by data
from our clinical development program.

Our clinical trials may fail to demonstrate adequately the safety and efficacy
of our product candidates, which could prevent or delay regulatory approval and commercialization.

Before obtaining
regulatory approvals for the commercial sale of our product candidates, we must demonstrate through lengthy, complex and expensive preclinical testing and clinical trials that the product is both safe and effective for use in each target indication.
Clinical trial results from the study of neuropathic pain are inherently difficult to predict. The primary measure of pain is subjective patient feedback, which can be influenced by factors outside of our control, and can vary widely from day to day
for a particular patient, and from patient to patient and site to site within a clinical study. The results we have obtained in completed clinical trials may not be predictive of results from our ongoing or future trials. Additionally, we may suffer
significant setbacks in advanced clinical trials, even after promising results in earlier studies.

Some of our trial results
have been negatively affected by factors that had not been fully anticipated prior to our examination of the trial results. For example, we have from time to time observed a significant placebo effect within our control groupsa
phenomenon in which a sham treatment or, in the case of our studies, a low-dose capsaicin treatment that we believed would not be effective, results in a beneficial effect. Although we design our clinical study protocols to address known factors
that may negatively affect our study results, there can be no assurance that our protocol designs will be adequate or that factors that we may or may not be aware of or anticipate, will not have a negative effect on the results of our clinical
trials, which could significantly disrupt our efforts to obtain regulatory approvals and commercialize our product candidates. Furthermore, once a study has commenced, we may voluntarily suspend or terminate our clinical trials if at any time we
believe that they present an unacceptable safety risk to patients. However, clinical trials in other indications or in a larger patient population could reveal more frequent, more severe or additional side effects that were not seen or deemed
unrelated in earlier studies, any of which could interrupt, delay or halt clinical trials of our product candidates and could result in the FDA or other regulatory authorities stopping further development of or denying approval of our product
candidates. Based on results at any stage of clinical trials, we may decide to repeat or redesign a trial, modify our regulatory strategy or even discontinue development of one or more of our product candidates.

A number of companies in the biotechnology and pharmaceutical industries have suffered significant setbacks in advanced clinical trials,
even after obtaining promising results in earlier trials. If our product candidates are not shown to be both safe and effective in clinical trials, the resulting delays in developing other compounds and conducting associated preclinical testing and
clinical trials, as well as the potential need for additional financing, would have a material adverse effect on our business, financial condition and results of operations.

Delays in the commencement or completion of clinical testing could result in increased costs to us and delay our ability to
generate revenues.

We do not know whether future clinical trials will begin on time or be completed on schedule, if at
all. The commencement and completion of clinical trials can be disrupted for a variety of reasons, including difficulties in:



| |  |  | availability of financial resources;
| | - |  | ------------------------------------



| |  |  | addressing issues that could be raised by the FDA or European or other national health authorities regarding safety, design, scope and objectives of
future clinical studies;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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| |  |  | recruiting and enrolling patients to participate in a clinical trial;
| | - |  | ---------------------------------------------------------------------



| |  |  | obtaining regulatory or Institutional Review Board/Ethics Committee approval to commence a clinical trial;
| | - |  | ----------------------------------------------------------------------------------------------------------



| |  |  | reaching agreement on acceptable terms with prospective clinical research organizations and trial sites;
| | - |  | --------------------------------------------------------------------------------------------------------



| |  |  | manufacturing sufficient quantities of a product candidate; and
| | - |  | ---------------------------------------------------------------



| |  |  | obtaining institutional review board approval to conduct a clinical trial at a prospective site.
| | - |  | ------------------------------------------------------------------------------------------------

A clinical trial may also be suspended or terminated by the entity conducting the trial (us or Astellas, as the case may be), the FDA or
other regulatory authorities due to a number of factors, including:



| |  |  | failure to conduct the clinical trial in accordance with regulatory requirements or in accordance with clinical protocols;
| | - |  | --------------------------------------------------------------------------------------------------------------------------



| |  |  | inspection of the clinical trial operations or trial site by the FDA or other regulatory authorities resulting in the imposition of a clinical hold;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | unforeseen safety issues; or
| | - |  | ----------------------------



| |  |  | inadequate patient enrollment or lack of adequate funding to continue the clinical trial.
| | - |  | -----------------------------------------------------------------------------------------

In addition, changes in regulatory requirements and guidance may occur and may cause a need to amend clinical trial protocols to reflect
these changes, which could impact the cost, timing or successful completion of a clinical trial. If delays are experienced in the commencement or completion of a clinical trial, the commercial prospects for our products or product candidates and our
ability to generate product revenues may be harmed. Many of the factors that cause, or lead to, a delay in the commencement or completion of clinical trials may also lead to the denial or revocation of regulatory approval of a product or product
candidate.

We rely on third parties to conduct our non-clinical studies and clinical trials. If these third parties do
not perform as contractually required or otherwise expected, we may not be able to obtain regulatory approval for our product candidates.

We do not currently conduct non-clinical studies and clinical trials on our own, and instead rely on third parties, such as contract
research organizations, medical institutions, clinical investigators and contract laboratories, to assist us with our non-clinical and clinical trials. We are also required to comply with regulations and standards, commonly referred to as good
clinical practices and good laboratory practices, for conducting, recording and reporting the results of clinical and non-clinical trials to assure that data and reported results are credible and accurate and that the trial participants are
adequately protected. If these third parties do not successfully meet their regulatory obligations, meet expected deadlines, or if the quality or accuracy of the data they obtain is compromised due to the failure to adhere to our clinical protocols
or regulatory requirements or for other reasons, our non-clinical development activities or clinical trials may be extended, delayed, suspended, terminated, or potentially may be required to be performed again. Any of these factors may result in
significant delay or failure to obtain regulatory approval for our product candidates.

Qutenza is distributed through a
small network of third-party specialty distributors and specialty pharmacies and we rely on a single third party logistics partner; if any of the distributors fail or refuse to



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distribute Qutenza on commercially favorable terms, or at all, or if the third party logistics partner fails or refuses to perform its function, our business could be adversely affected.

We distribute Qutenza through a small network of third party specialty distributors and specialty pharmacies that generally
sell, distribute or provide Qutenza to hospitals or physicians. All of our Qutenza shipments are through these distributors. In addition, we rely on a single third party logistics provider to manage our warehouse, pick pack and ship functions as
well as certain customer and account administrative functions. Our business would be harmed if any of these distributors refused to distribute Qutenza or refused to purchase Qutenza on commercially favorable terms to us. It is possible that
distribution partners could decide to change their policies or fees, or both, in the future. This could result in their refusal to distribute smaller volume products, or cause higher product distribution costs, lower margins or the need to find
alternative methods of distributing products. Such alternative methods may not exist or may not be economically viable. In addition, we are subject to a number of risks associated with our dependence on third parties for distribution of Qutenza
which could adversely affect sales of Qutenza and our business.

Even though certain of our clinical trials for Qutenza
have met their primary endpoints, certain other studies have not met their primary endpoints and, our clinical trials for other indications, if we or our collaborator decide to conduct them, may not succeed, which would adversely impact our long
term success.

We have not prepared for or conducted any Qutenza clinical trials for indications other than PHN,
HIV-DSP and PDN. We have conducted two Phase 3 clinical trials with Qutenza for patients with HIV-DSP, one of which met its primary endpoint and one which did not meet its primary endpoint. We have also conducted one Phase 2 clinical trial that
evaluated the use of Qutenza in patients with PDN. PDN represents a much larger market opportunity than either PHN or HIV-DSP, and unless required clinical trials are successfully completed and regulatory approvals are obtained for the use of
Qutenza for PDN patients, Qutenza will not be marketable for this indication in the United States and the European Union and possibly in other countries. If this occurs, our long-term ability to succeed may be significantly and negatively impacted.
We believe that to market Qutenza in the United States for future indications, including HIV-DSP and PDN, we may have to conduct two successful Phase 3 trials for those indications, and that for PDN in particular, we may be required to perform
additional safety studies. We are evaluating development programs for Qutenza in PDN and may decide not to conduct studies in PDN beyond those that may be required by post-marketing requirements associated with our MA. If we do not conduct the
required number of Phase 3 studies in either HIV-DSP or PDN that meet their primary endpoint, we may not gain approval for Qutenza in these indications, which will significantly harm our ability to potentially generate revenue.

Results of clinical trials of Qutenza for patients with PHN or HIV-DSP do not necessarily predict the results of clinical trials
involving other indications. If additional clinical studies are conducted with Qutenza in PDN or other indications, those studies may fail to show desired safety and efficacy for management of pain associated with PDN and other indications, despite
results from earlier clinical trials involving PDN, PHN and/or HIV-DSP. Any failure or significant delay in completing clinical trials for Qutenza with PDN and other indications, or in receiving regulatory approval involving such indications, may
significantly harm our business.

We depend on our key personnel. If we are not able to retain them, our business will
suffer.

We are highly dependent on the principal members of our management and scientific staff. The competition for
skilled personnel among biopharmaceutical companies in the San Francisco Bay Area is intense and the employment services of our scientific, management and other executive officers are terminable at-will. If we lose one or more of these key
employees, our ability to implement and execute our



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business strategy successfully could be seriously harmed. Replacing key employees may be difficult and may take an extended period of time because of the limited number of individuals in our
industry with the breadth of skills and experience required to develop, gain regulatory approval of and commercialize products successfully. We do not carry key man life insurance on any of our key personnel.

Risks Related to Our Finances and Capital Requirements

We have incurred operating losses in each year since inception and expect to continue to incur substantial and increasing losses for
the foreseeable future.

We have incurred operating and net losses each year since our inception in 1998. Our net loss
for the three and six months ended June 30, 2010 and twelve months ended December 31, 2009 was approximately $10.2 million $19.4 million and $21.9 million, respectively. As of June 30, 2010 we had an accumulated deficit of approximately
$231.4 million. We had cash, cash equivalents and short-term investments totaling $67.9 million at June 30, 2010 and for the three months ended June 30, 2010, we used cash of approximately $21.3 million in operating activities. We expect
to continue to incur losses for several years, as we commercialize Qutenza and continue other research and development activities. If Qutenza does not achieve market acceptance in the United States or the European Union, we will not generate
significant product related revenue. We cannot assure you that we will be profitable even if Qutenza is successfully commercialized. If we fail to achieve and maintain profitability, or if we are unable to fund our continuing losses, you could lose
all or part of your investment.

If we do not raise additional capital, we may be forced to delay; reduce or eliminate
our commercialization efforts or development programs.

Our future capital requirements will depend on, and could
increase significantly as a result of many factors, including:



| |  |  | the costs of establishing, maintaining and expanding sales and marketing infrastructure, distribution capabilities and a sales force and other market
support functions such as medical affairs and pharmacovigilance;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the conduct of manufacturing activities including the manufacture of commercial product supply and clinical product supply;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------



| |  |  | the success of the commercialization of our products;
| | - |  | -----------------------------------------------------



| |  |  | the costs of carrying out our obligations under our commercial arrangement with Astellas;
| | - |  | -----------------------------------------------------------------------------------------



| |  |  | our ability to establish and maintain strategic collaborations, including licensing, distribution and other arrangements that we have or may establish;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the progress of our development programs including the number, size and scope of clinical trials and non-clinical development;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------



| |  |  | the costs and timing of additional regulatory approvals;
| | - |  | --------------------------------------------------------



| |  |  | the costs involved in enforcing or defending patent claims or other intellectual property rights; and
| | - |  | -----------------------------------------------------------------------------------------------------



| |  |  | the extent to which we acquire or invest in other products, technologies and businesses.
| | - |  | ----------------------------------------------------------------------------------------



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We intend to seek additional funding through strategic alliances and/or debt facilities or
other financing vehicles which may include the public or private sales of our equity securities. There can be no assurance, however, that additional funding will be available on reasonable terms, if at all. If adequate funds are not available, we
may be required to further delay, reduce the scope of, or eliminate one or more of our planned development, commercialization or expansion activities.

Raising additional funds by issuing securities or through licensing arrangements may cause dilution to existing stockholders,
restrict our operations or require us to relinquish proprietary rights.

To the extent that we raise additional capital
by issuing equity securities, our existing stockholders ownership will be diluted. Royalty monetization structures may require us to give up or assign certain rights to certain current and future assets. Any debt financing we enter into may
involve covenants that restrict our operations. These restrictive covenants may include limitations on additional borrowing and specific restrictions on the use of our assets, as well as prohibitions on our ability to create liens, pay dividends,
redeem our stock or make investments. In addition, if we raise additional funds through licensing arrangements, it may be necessary to relinquish potentially valuable rights to our potential products or proprietary technologies, or grant licenses on
terms that are not favorable to us.

Failure to meet our loan obligation with Cowen Royalty could adversely affect our
financial condition.

Under the terms of our Financing Agreement with Cowen Royalty, we are obligated to pay Cowen
Royalty, substantially all of the payments that may be due to us under the Astellas Agreement, until Cowen Royalty has received $90 million of such payments; and thereafter 5% of the Astellas Agreement payments until Cowen Royalty has received $106
million of such payments.

Our obligation to pay these payments during the term of the financing Agreement is secured under a
security agreement by rights that we have to the revenue interests under the Astellas Agreement, and by intellectual property and our other rights to the extent necessary or used to commercialize products covered by the Astellas Agreement in the
Licensed Territory.

Because these obligations will in the near term divert all revenues that we may receive under the
Astellas Agreement, our financial position and ability to continue operations would be adversely impacted if we required further capital, even if Astellas was successfully commercializing our products in the Licensed Territory. Furthermore, the
arrangement under the Financing Agreement may make us less attractive to potential acquirers, and in the event that we exercised our change of control pay-off option to terminate the Financing Agreement in order to carry out a change of control, the
payment of such funds out of our available cash or acquisition proceeds would reduce acquisition proceeds for our stockholders.

Risks
Related to our Intellectual Property

The commercial success, if any, of Qutenza depends, in part, on the rights we
have under certain patents.

The commercial success, if any, of Qutenza depends, in part, on a patent granted in the
United States and device patents granted in Canada, Hong Kong and certain countries of Europe concerning the use of a dermal delivery system for prescription strength capsaicin delivery for the treatment of neuropathic pain. We exclusively license
these patents from the University of California. We do not currently own, and do not have rights under this license to any issued patents that cover Qutenza outside Europe, Hong Kong, Canada and the United States. Although we have filed for an
extension of the term for one of the patents licensed from the University of California, there can be no assurance that such extension will be granted. One or more of the inventors named in the method patent described below may assert a claim of
inventorship rights to such patent, which may result in our loss of exclusive use of this patent. Although we do not believe these



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individuals are co-inventors, there can be no assurance that we would prevail if such a claim were asserted. The absence of exclusive rights to utilize such patent exposes us to a greater risk of
direct competition and could materially harm our business.

In addition to other patents and patent applications which have
been licensed under our agreements with third party manufacturers, including the issued patents and pending applications licensed under our commercial supply agreement for Qutenza, we also license a method patent granted in the United States from
the University of California concerning the delivery of prescription strength capsaicin for the treatment of neuropathic pain. Two of the three inventors named in the method patent did not assign their patent rights to the University of California.
As a result, our rights under this patent are non-exclusive. Anesiva, a company focused on the development and commercialization of treatments for pain, including injection or infiltration of capsaicin for post-surgical pain, osteoarthritis or
interdigital neuroma, has licensed from one of the non-assigning inventors the right to use the technology under the method patent. There can be no assurances that other entities will not similarly obtain rights to use the technology under the
method patent. If other entities license the right to use this patent, we may face more products competitive with Qutenza and our business will suffer.

If we are unable to maintain and enforce our proprietary rights, we may not be able to compete effectively or operate profitably.

Our commercial success will depend, in part, on obtaining and maintaining patent protection, trade secret protection
and regulatory protection (such as Hatch-Waxman protection or orphan drug designation) of our proprietary technology and information as well as successfully defending against third-party challenges to our proprietary technology and information. We
will be able to protect our proprietary technology and information from use by third parties only to the extent that valid and enforceable patents, trade secrets or regulatory protection cover them and we have exclusive rights to utilize them.

Our commercial success will continue to depend in part on the patent rights we own, the patent rights we have licensed, the
patent rights of our collaborators and suppliers and the patent rights we may obtain related to future products we may market. Our success also depends on our and our licensors, collaborators and suppliers ability to maintain these
patent rights against third-party challenges to their validity, scope or enforceability. Further, we do not fully control the patent prosecution of our licensed patent applications. There is a risk that our licensors will not devote the same
resources or attention to the prosecution of the licensed patent applications as we would if we controlled the prosecution of the patent applications, and the resulting patent protection, if any, may not be as strong or comprehensive as if we had
prosecuted the applications ourselves.

The patent positions of biopharmaceutical companies can be highly uncertain and
involve complex legal and factual questions for which important legal principles remain unresolved. No consistent policy regarding the breadth of claims allowed in such companies patents has emerged to date in the United States. The patent
situation outside the United States is even more uncertain. Changes in either the patent laws or in interpretations of patent laws in the United States or other countries may diminish the value of our intellectual property. Accordingly, we cannot
predict the breadth of claims that may be allowed or enforced in our patents or in third-party patents. For example:



| |  |  | we or our licensors might not have been the first to make the inventions covered by each of our pending patent applications and issued patents;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | we or our licensors might not have been the first to file patent applications for these inventions;
| | - |  | ---------------------------------------------------------------------------------------------------



| |  |  | others may independently develop similar or alternative technologies or duplicate any of our technologies;
| | - |  | ----------------------------------------------------------------------------------------------------------



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| |  |  | it is possible that none of our pending patent applications or the pending patent applications of our licensors will result in issued patents;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our issued patents and the issued patents of our licensors may not provide a basis for commercially viable products, or may not provide us with any
competitive advantages, or may be challenged and invalidated by third parties;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | we may not develop additional proprietary technologies or product candidates that are patentable; or
| | - |  | ----------------------------------------------------------------------------------------------------



| |  |  | the patents of others may have an adverse effect on our business.
| | - |  | -----------------------------------------------------------------

We also rely on trade secrets to protect our technology, especially where we do not believe patent protection is appropriate or
obtainable. However, trade secrets are difficult to protect. While we seek to protect confidential information, in part, by confidentiality agreements with our employees, consultants, contractors, or scientific and other advisors, they may
unintentionally or willfully disclose our information to competitors. If we were to enforce a claim that a third party had illegally obtained and was using our trade secrets, it would be expensive and time consuming, and the outcome would be
unpredictable. In addition, courts outside the United States are sometimes less willing to protect trade secrets.

If we are
not able to defend the patent or trade secret protection position of our technologies and product candidates, then we will not be able to exclude competitors from developing or marketing competing products, and we may not generate enough revenue
from product sales to justify the cost of development of our product candidates and to achieve or maintain profitability.

If we are sued for infringing intellectual property rights of other parties, such litigation will be costly and time consuming, and
an unfavorable outcome would have a significant adverse effect on our business.

Although we
believe that we would have valid defenses to allegations that our current product candidates, production methods and other activities infringe the valid and enforceable intellectual property rights of any third parties of which we are aware, we
cannot be certain that a third party will not challenge our position in the future. Other parties may own patent or other intellectual property rights that might be infringed by our products, trademarks or activities. For example, in June 2005,
Winston Laboratories sent us a letter informing us of their U.S. patent related to cis-capsaicin, and suggested that our synthetic capsaicin formulation could infringe this patent. We responded in August 2005 by denying any infringement.
In 2007, Winston reiterated its claim and offered to discuss a license to its patent. We responded by denying infringement. We believe that our products, if commercialized, would not infringe the Winston patent, which we believe expired in 2009 in
the United States and may expire in June 2010 in the European Union, but may be extended under certain circumstances. While we believe that the Winston patent expired in 2009 in the United States, there can be no assurance that the patent was not
extended, unbeknownst to us. There has been, and we believe that there will continue to be, significant litigation and demands for licenses in our industry regarding patent and other intellectual property rights. Our competitors or other patent or
intellectual property holders may assert that our products or trademarks and the methods we employ are covered by their intellectual property rights. For example, we recently received a letter indicating a possible trademark conflict for
Qutenza® from a company claiming that our trademark was similar to theirs. While we believe that these
assertions do not have merit and that we have defenses to them, there can be no assurance that we will be successful in defending our trademark. We intend to continue to use the Qutenza trademark and to vigorously defend our use of such trademark
against such assertions. These parties could bring claims against us that would cause us to incur substantial expenses and, if successful against us, could cause us to pay substantial damages or possibly prevent us from commercializing our product
candidates using the Qutenza trademark which would have a significant negative effect on the Qutenza launch and global commercialization efforts. Further, if a patent infringement suit were brought against us, we could be forced to stop or delay
research,



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development, manufacturing or sales of the product or product candidate that is the subject of the suit, or if a trademark infringement suit were brought against us or our collaboration partner
Astellas, we or Astellas could be forced to cease using the name Qutenza in connection with our product.

As a result of
intellectual property infringement claims, or in order to avoid potential claims, we may choose to seek, or be required to seek, a license from the third party and would most likely be required to pay license fees or royalties or both. These
licenses may not be available on acceptable terms, or at all. Even if we were able to obtain a license, the rights may be non-exclusive, which would give our competitors access to the same intellectual property. Ultimately, we could be prevented
from commercializing a product, or be forced to cease some aspect of our business operations if, as a result of actual or threatened infringement claims, we or our collaborators are unable to enter into licenses on acceptable terms. This could harm
our business significantly.

We may incur substantial costs as a result of litigation or other proceedings relating to
patent and other intellectual property rights.

The cost to us of any litigation or other proceedings relating to
intellectual property rights, even if resolved in our favor, could be substantial. Some of our potential competitors, other patent or intellectual property holders may be better able to sustain the costs of complex patent litigation because they
have substantially greater resources. Uncertainties resulting from the initiation and continuation of any litigation could have a material adverse effect on our ability to continue our operations. Should third parties file patent applications, or be
issued patents claiming technology also claimed by us in pending applications, we may be required to participate in interference proceedings in the U.S. Patent and Trademark Office to determine priority of invention which could result in substantial
costs to us or an adverse decision as to the priority of our inventions. An unfavorable outcome in an interference proceeding could require us to cease using the technology or to license rights from prevailing third parties. There is no guarantee
that any prevailing party would offer us a license or that we could acquire any license made available to us on commercially acceptable terms.

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

We are a
party to a number of technology licenses that are important to our business and expect to enter into additional licenses in the future. For example, we hold licenses from The University of California and LTS under patents and patent applications
relating to Qutenza. These licenses impose various commercialization, milestone payment, royalty, insurance and other obligations on us. If we fail to comply with these obligations, the licensor may have the right to terminate the license, in which
event we would not be able to market products covered by the license, including Qutenza.

We may be subject to damages
resulting from claims that our employees or we have wrongfully used or disclosed alleged trade secrets of their former employers.

Many of our employees were previously employed at universities or other biotechnology or pharmaceutical companies, including our
competitors or potential competitors. Although no claims against us are currently pending, we may be subject to claims that these employees or we have inadvertently or otherwise used or disclosed trade secrets or other proprietary information of
their former employers. Litigation may be necessary to defend against these claims. If we fail in defending such claims, in addition to paying monetary damages, we may lose valuable intellectual property rights or personnel. A loss of key research
personnel or their work product could hamper or prevent our ability to commercialize certain potential products, which could severely harm our business. Even if we are successful in defending against these claims, litigation could result in
substantial costs and be a distraction to management.



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Risks Related to an Investment in our Common Stock

We expect that our stock price will fluctuate significantly, and you may not be able to resell your shares at or above your
investment price.

The stock market has experienced significant volatility, particularly with respect to
pharmaceutical, biotechnology and other life sciences company stocks. The volatility of pharmaceutical, biotechnology and other life sciences company stocks often does not relate to the operating performance of the companies represented by the
stock. Factors that could cause volatility in the market price of our common stock include, but are not limited to:



| |  |  | failure to meet market expectations with respect to the launch of Qutenza by us in the United States and by Astellas in the European Union;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | inability of us and Astellas to successfully commercialize Qutenza in the United States and the Licensed Territory, respectively;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------



| |  |  | potential inability to preserve or raise sufficient capital to maintain our operations;
| | - |  | ---------------------------------------------------------------------------------------



| |  |  | failure to meet revenue estimates and revenue growth rates;
| | - |  | -----------------------------------------------------------



| |  |  | actual or anticipated quarterly variations in our results of operations or those of our collaborators or competitors;
| | - |  | ---------------------------------------------------------------------------------------------------------------------



| |  |  | third-party healthcare reimbursement policies or determinations;
| | - |  | ----------------------------------------------------------------



| |  |  | general economic conditions and slow or negative growth of our expected markets;
| | - |  | --------------------------------------------------------------------------------



| |  |  | delay in entering, or termination of, strategic partnership relationships;
| | - |  | --------------------------------------------------------------------------



| |  |  | failure or delays in entering additional product candidates into clinical trials or in commencing additional clinical trials for current product
candidates;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | results from and any delays related to the clinical trials for our product candidates;
| | - |  | --------------------------------------------------------------------------------------



| |  |  | our ability to develop and market new and enhanced product candidates on a timely basis;
| | - |  | ----------------------------------------------------------------------------------------



| |  |  | announcements by us or our collaborators or competitors of new commercial products, clinical progress or the lack thereof, significant contracts,
commercial relationships or capital commitments;
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | issuance of new or changed securities analysts reports or recommendations for our stock or the discontinuation of one or more securities
analysts research coverage for our stock;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | inclusion in or removal from stock indices such as the Russell 3000;
| | - |  | --------------------------------------------------------------------



| |  |  | developments or disputes concerning our intellectual property or other proprietary rights;
| | - |  | ------------------------------------------------------------------------------------------



| |  |  | commencement of, or our involvement in, litigation;
| | - |  | ---------------------------------------------------



| |  |  | changes in governmental statutes or regulations or in the status of our regulatory approvals;
| | - |  | ---------------------------------------------------------------------------------------------



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| |  |  | market conditions in the life sciences sector; and
| | - |  | --------------------------------------------------



| |  |  | any major change in our board or management.
| | - |  | --------------------------------------------

If we fail to meet the requirements for continued listing on the NASDAQ Global Market and do not meet initial listing requirements
to transfer to the NASDAQ Capital Market, our common stock could be delisted from trading, which would adversely affect the liquidity of our common stock and our ability to raise additional capital.

Our common stock is currently listed on the NASDAQ Global Market and to maintain our listing, we must meet certain financial requirements
in accordance with the rules of the NASDAQ Stock Market LLC, or Nasdaq. Although we have maintained our listing status on the NASDAQ Global Market since our initial listing on May 2, 2007, there can be no assurance that we will maintain our
listing on this market in the future.

If we are delisted from the NASDAQ Global Market, we can apply to be listed on the
NASDAQ Capital Market or other exchanges, which generally have lower standards for listing. Any potential delisting of our common stock would adversely affect the liquidity of our common stock and our ability to raise additional capital.

We will continue to incur increased costs and demands upon management as a result of complying with the laws and regulations
affecting public companies, which could affect our operating results.

As a public company, we will continue to incur
significant legal, accounting and other expenses that we did not incur as a private company, including costs associated with public company reporting requirements. We also have incurred and will incur costs associated with corporate governance
requirements, including requirements under the Sarbanes-Oxley Act, as well as new rules implemented by the Securities and Exchange Commission and the NASDAQ Stock Market LLC. We expect these rules and regulations to increase our legal and financial
compliance costs and to make some activities more time-consuming and costly.

If the ownership of our common stock
continues to be highly concentrated, it may prevent you and other stockholders from influencing significant corporate decisions and may result in conflicts of interest that could cause our stock price to decline.

Our executive officers, directors and their affiliates and 5% stockholders beneficially own or control approximately 58% of the
outstanding shares of our common stock as of June 30, 2010 (after giving effect to the exercise of all of their outstanding vested options and warrants exercisable within 60 days of such date). Accordingly, these executive officers, directors
and their affiliates and significant stockholders acting as a group, will have substantial influence over the outcome of corporate actions requiring stockholder approval, including the election of directors, any merger, consolidation or sale of all
or substantially all of our assets or any other significant corporate transactions. These stockholders may also delay or prevent a change of control of us, even if such a change of control would benefit our other stockholders. The significant
concentration of stock ownership may adversely affect the trading price of our common stock due to investors perception that conflicts of interest may exist or arise.

Future sales of shares by existing stockholders could cause our stock price to decline.

The market price of our common stock could decline as a result of sales by our existing stockholders, including sales by our executive
officers, of shares of common stock in the market, or the perception that these sales could occur. These sales might also make it more difficult for us to sell equity securities at a time and price that we deem appropriate.



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Anti-takeover provisions in our charter documents and under Delaware law could make an
acquisition of us, which may be beneficial to our stockholders, more difficult and may prevent attempts by our stockholders to replace or remove our current management.

Provisions in our certificate of incorporation and bylaws may delay or prevent an acquisition of us or a change in our management. These
provisions include a classified board of directors, a prohibition on actions by written consent of our stockholders and the ability of our board of directors to issue preferred stock without stockholder approval. In addition, because we are
incorporated in Delaware, we are governed by the provisions of Section 203 of the Delaware General Corporation Law, which prohibits stockholders owning in excess of 15% of our outstanding voting stock from merging or combining with us. Although
we believe these provisions collectively provide for an opportunity to receive higher bids by requiring potential acquirers to negotiate with our board of directors, they would apply even if the offer may be considered beneficial by some
stockholders. In addition, these provisions may frustrate or prevent any attempts by our stockholders to replace or remove our current management by making it more difficult for stockholders to replace members of our board of directors, which is
responsible for appointing the members of our management.

Events in the credit markets have, and will continue to,
impact our investment returns.

As a result of events in the credit markets, we maintain an investment portfolio of
primarily U.S. Treasury securities. As a result of the credit crisis and our shift in investments, we anticipate that our investment returns will be below our historic rates of return. These lower returns will likely continue for some time and we
cannot predict when market conditions will improve and when higher yielding investment options may be available to us.

We have never paid dividends on our capital stock, and we do not anticipate paying any cash dividends in the foreseeable future.

We have paid no cash dividends on any of our classes of capital stock to date, have contractual restrictions against
paying cash dividends and currently intend to retain our future earnings to fund the development and growth of our business. As a result, capital appreciation, if any, of our common stock will be an investors sole source of gain for the foreseeable
future.



|ITEM 2. | UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS
|------- | -----------------------------------------------------------

None.



|ITEM 3. | DEFAULTS UPON SENIOR SECURITIES
|------- | -------------------------------

None.



|ITEM 4. | [REMOVED AND RESERVED]
|------- | ----------------------



|ITEM 5. | OTHER INFORMATION
|------- | -----------------

None.



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|ITEM 6. | EXHIBITS
|------- | --------



|               |  |                                                                                                                                                                          
|-------------- |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Exhibit
Number |  | Exhibit Title                                                                                                                                                            
|3.1(1)         |  | Amended and Restated Certificate of Incorporation.                                                                                                                       
|               | 
|3.2(1)         |  | Amended and Restated Bylaws.                                                                                                                                             
|               | 
|4.1(1)         |  | Specimen Common Stock Certificate.                                                                                                                                       
|               | 
|4.2(1)         |  | Third Amended and Restated Investors Rights Agreement by and between NeurogesX, Inc. and certain stockholders, dated as of November 14, 2005.                           
|               | 
|4.3(2)         |  | Amendment No. 1 to the Third Amended and Restated Investors Rights Agreement by and between NeurogesX, Inc. and certain stockholders, dated as of December 28,
2007.    
|               | 
|4.4(1)         |  | Warrant to Purchase Series A Preferred Stock by and between NeurogesX, Inc. and Silicon Valley Bank, dated as of December 14, 2000.                                      
|               | 
|4.5(1)         |  | Warrant to Purchase Series B Preferred Stock by and between NeurogesX, Inc. and Silicon Valley Bank, dated as of May 1, 2002.                                            
|               | 
|4.6(1)         |  | Warrant to Purchase Shares of Series C2 Preferred Stock by and between NeurogesX, Inc. and Horizon Technology Funding Company II LLC, dated as of July 7,
2006.          
|               | 
|4.7(1)         |  | Warrant to Purchase Shares of Series C2 Preferred Stock by and between NeurogesX, Inc. and Horizon Technology Funding Company III LLC, dated as of July 7,
2006.         
|               | 
|4.8(1)         |  | Warrant to Purchase Shares of Series C2 Preferred Stock by and between NeurogesX, Inc. and Oxford Finance Corporation, dated as of July 7, 2006.                         
|               | 
|4.9(1)         |  | Form of First Warrant to Purchase Series C2 Preferred Stock.                                                                                                             
|               | 
|4.10(1)        |  | Form of Second Warrant to Purchase Series C2 Preferred Stock.                                                                                                            
|               | 
|4.11(2)        |  | Registration Rights Agreement by and between NeurogesX, Inc. and certain investors, dated as of December 23, 2007.                                                       
|               | 
|4.12(2)        |  | Form of Warrant to Purchase Common Stock.                                                                                                                                
|               | 
|10.1           |  | 2010 Executive Bonus Plan                                                                                                                                                
|               | 
|10.2          |  | Financing Agreement by and between NeurogesX, Inc, and Cowen Healthcare Royalty Partners, L.P., dated as of April 29, 2010.                                              
|               | 
|10.3           |  | Amendment to Financing Agreement by and between NeurogesX, Inc. and Cowen Healthcare Royalty Partners, L.P., dated as of May 20, 2010.                                   
|               | 
|10.4(3)        |  | 2007 Stock Plan, as amended and restated.                                                                                                                                
|               | 
|31.1           |  | Certification of Principal Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.                                                                  
|               | 
|31.2           |  | Certification of Principal Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.                                                                  
|               | 
|32.1           |  | Certifications of the Principal Executive Officer and the Principal Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C.
Section 1350).



|(1) | Incorporated by reference from our registration statement on Form S-1, registration number 333-140501, declared effective by the Securities and Exchange
Commission on May 1, 2007.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(2) | Incorporated by reference from our Current Report on Form 8-K, filed with the Securities and Exchange Commission on December 28, 2007.
|--- | --------------------------------------------------------------------------------------------------------------------------------------

|(3) | Incorporated by reference from our Current Report on Form 8-K, filed with the Securities and Exchange Commission on June 7, 2010.
|--- | ---------------------------------------------------------------------------------------------------------------------------------

| | Confidential treatment has been requested for portions of this exhibit. These portions have been omitted from this filing and have been filed separately with the
Securities and Exchange Commission.
|- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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SIGNATURES

Pursuant to the requirements of the Securities Act of 1934, the registrant has duly caused this report to be signed on its behalf by the
undersigned, thereunto duly authorized.



|                       |  |                                                                             
|---------------------- |  | ----------------------------------------------------------------------------
|Dated: August 11, 2010 |  | NEUROGESX, INC.                                                             
|                       |  | (Registrant)                                                                
|                       | 
|                       |  | /s/ Anthony A. DiTonno                                                      
|                       |  | Anthony A. DiTonno                                                          
|                       |  | President and Chief Executive Officer                                       
|                       |  | (Principal Executive Officer)                                               
|                       | 
|                       |  | /s/ Stephen F. Ghiglieri                                                    
|                       |  | Stephen F. Ghiglieri                                                        
|                       |  | Executive Vice President, Chief Operating Officerand Chief Financial Officer
|                       |  | (Principal Financial and Accounting Officer)                                



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EXHIBIT INDEX



|               |  |                                                                                                                                                                          
|-------------- |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Exhibit
Number |  | Exhibit Title                                                                                                                                                            
|3.1(1)         |  | Amended and Restated Certificate of Incorporation.                                                                                                                       
|               | 
|3.2(1)         |  | Amended and Restated Bylaws.                                                                                                                                             
|               | 
|4.1(1)         |  | Specimen Common Stock Certificate.                                                                                                                                       
|               | 
|4.2(1)         |  | Third Amended and Restated Investors Rights Agreement by and between NeurogesX, Inc. and certain stockholders, dated as of November 14, 2005.                           
|               | 
|4.3(2)         |  | Amendment No. 1 to the Third Amended and Restated Investors Rights Agreement by and between NeurogesX, Inc. and certain stockholders, dated as of December 28,
2007.    
|               | 
|4.4(1)         |  | Warrant to Purchase Series A Preferred Stock by and between NeurogesX, Inc. and Silicon Valley Bank, dated as of December 14, 2000.                                      
|               | 
|4.5(1)         |  | Warrant to Purchase Series B Preferred Stock by and between NeurogesX, Inc. and Silicon Valley Bank, dated as of May 1, 2002.                                            
|               | 
|4.6(1)         |  | Warrant to Purchase Shares of Series C2 Preferred Stock by and between NeurogesX, Inc. and Horizon Technology Funding Company II LLC, dated as of July 7,
2006.          
|               | 
|4.7(1)         |  | Warrant to Purchase Shares of Series C2 Preferred Stock by and between NeurogesX, Inc. and Horizon Technology Funding Company III LLC, dated as of July 7,
2006.         
|               | 
|4.8(1)         |  | Warrant to Purchase Shares of Series C2 Preferred Stock by and between NeurogesX, Inc. and Oxford Finance Corporation, dated as of July 7, 2006.                         
|               | 
|4.9(1)         |  | Form of First Warrant to Purchase Series C2 Preferred Stock.                                                                                                             
|               | 
|4.10(1)        |  | Form of Second Warrant to Purchase Series C2 Preferred Stock.                                                                                                            
|               | 
|4.11(2)        |  | Registration Rights Agreement by and between NeurogesX, Inc. and certain investors, dated as of December 23, 2007.                                                       
|               | 
|4.12(2)        |  | Form of Warrant to Purchase Common Stock.                                                                                                                                
|               | 
|10.1           |  | 2010 Executive Bonus Plan                                                                                                                                                
|               | 
|10.2          |  | Financing Agreement by and between NeurogesX, Inc, and Cowen Healthcare Royalty Partners, L.P., dated as of April 29, 2010.                                              
|               | 
|10.3           |  | Amendment to Financing Agreement by and between NeurogesX, Inc. and Cowen Healthcare Royalty Partners, L.P., dated as of May 20, 2010.                                   
|               | 
|10.4(3)        |  | 2007 Stock Plan, as amended and restated.                                                                                                                                
|               | 
|31.1           |  | Certification of Principal Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.                                                                  
|               | 
|31.2           |  | Certification of Principal Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.                                                                  
|               | 
|32.1           |  | Certifications of the Principal Executive Officer and the Principal Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C.
Section 1350).



|(1) | Incorporated by reference from our registration statement on Form S-1, registration number 333-140501, declared effective by the Securities and Exchange
Commission on May 1, 2007.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(2) | Incorporated by reference from our Current Report on Form 8-K, filed with the Securities and Exchange Commission on December 28, 2007.
|--- | --------------------------------------------------------------------------------------------------------------------------------------

|(3) | Incorporated by reference from our Current Report on Form 8-K, filed with the Securities and Exchange Commission on June 7, 2010.
|--- | ---------------------------------------------------------------------------------------------------------------------------------

| | Confidential treatment has been requested for portions of this exhibit. These portions have been omitted from this filing and have been filed separately with the
Securities and Exchange Commission.
|- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



51