COMMON STOCK PURCHASE AGREEMENT

Exhibit 10.1

COMMON STOCK PURCHASE AGREEMENT

Dated September 7, 2007

by and between

MEDIVATION, INC.

and

AZIMUTH OPPORTUNITY LTD.

TABLE OF CONTENTS

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ii

Annex A.    Definitions

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COMMON STOCK PURCHASE AGREEMENT

This COMMON STOCK PURCHASE AGREEMENT , made and entered into on this 7th day of September 2007 (this “ Agreement ”), by and between Azimuth Opportunity Ltd., an international business company incorporated under the laws of the British Virgin Islands (the “ Investor ”), and Medivation, Inc., a corporation organized and existing under the laws of the State of Delaware (the “ Company ”).

RECITALS

WHEREAS , the parties desire that, upon the terms and subject to the conditions contained herein, the Company may issue and sell to the Investor and the Investor shall thereupon purchase from the Company up to $100,000,000 worth of newly issued shares of the Company’s common stock, $0.01 par value (“ Common Stock ”), subject, in all cases, to the Trading Market Limit; and

WHEREAS , the offer and sale of the shares of Common Stock hereunder have been registered by the Company in the Registration Statement, which has been declared effective by order of the Commission under the Securities Act;

NOW, THEREFORE , the parties hereto, intending to be legally bound, hereby agree as follows:

ARTICLE I

PURCHASE AND SALE OF COMMON STOCK

Section 1.1 Purchase and Sale of Stock . Upon the terms and subject to the conditions of this Agreement, during the Investment Period the Company in its discretion may issue and sell to the Investor up to $100,000,000 (the “ Total Commitment ”) worth of duly authorized, validly issued, fully paid and non-assessable shares of Common Stock (subject in all cases to the Trading Market Limit, the “ Aggregate Limit ”), by (i) the delivery to the Investor of not more than 24 separate Fixed Request Notices (unless the Investor and the Company mutually agree that a different number of Fixed Request Notices may be delivered) as provided in Article II hereof and (ii) the exercise by the Investor of Optional Amounts, which the Company may in its discretion grant to the Investor and which may be exercised by the Investor, in whole or in part, as provided in Article II hereof. The aggregate of all Fixed Request Amounts and Optional Amount Dollar Amounts shall not exceed the Aggregate Limit.

Section 1.2 Effective Date; Settlement Dates . This Agreement shall become effective and binding upon delivery of counterpart signature pages of this Agreement executed by each of the parties hereto, and by delivery of an opinion of counsel and a certificate of the Company as provided in Section 6.1 hereof, to the offices of Greenberg Traurig, LLP, 200 Park Avenue, New York, New York 10166, at l0:00 a.m., New York time, on the Effective Date. In consideration of and in express reliance upon the representations, warranties and covenants, and otherwise upon the terms and subject to the conditions, of this Agreement, from and after the Effective Date and during the Investment Period (i) the Company shall issue and sell to the Investor, and the Investor agrees to purchase from the Company, the Shares in respect of each Fixed Request and (ii) the Investor may in its discretion elect to purchase Shares in respect of

each Optional Amount. The issuance and sale of Shares to the Investor pursuant to any Fixed Request or Optional Amount shall occur on the applicable Settlement Date in accordance with Sections 2.7 and 2.9 (or on such Trading Day in accordance with Section 2.8, as applicable), provided in each case that all of the conditions precedent thereto set forth in Article VI theretofore shall have been fulfilled or (to the extent permitted by applicable law) waived.

Section 1.3 The Shares . The Company has or will have duly authorized and reserved for issuance, and covenants to continue to so reserve once reserved for issuance, free of all preemptive and other similar rights, at all times during the Investment Period, the requisite aggregate number of authorized but unissued shares of its Common Stock to timely effect the issuance, sale and delivery in full to the Investor of all Shares to be issued in respect of all Fixed Requests and Optional Amounts under this Agreement, in any case prior to the issuance to the Investor of such Shares.

Section 1.4 Current Report; Prospectus Supplement . As soon as practicable, but in any event not later than 5:30 p.m. (New York time) on the first Trading Day immediately following the Effective Date, the Company shall file with the Commission a report on Form 8-K relating to the transactions contemplated by, and describing the material terms and conditions of, this Agreement and disclosing all information relating to the transactions contemplated hereby required to be disclosed in the Registration Statement and the Base Prospectus (but which permissibly has been omitted therefrom in accordance with the Securities Act), including, without limitation, information required to be disclosed in the section captioned “Plan of Distribution” in the Base Prospectus (the “ Current Report ”). The Current Report shall include a copy of this Agreement as an exhibit. To the extent applicable, the Current Report shall be incorporated by reference in the Registration Statement in accordance with the provisions of Rule 430B under the Securities Act. The Company heretofore has provided the Investor a reasonable opportunity to comment on a draft of such Current Report and has given due consideration to such comments. The Company shall file a final Base Prospectus pursuant to Rule 424(b) under the Securities Act on or prior to the second Trading Day immediately following the Effective Date. Pursuant to Section 5.9 and subject to the provisions of Section 5.8, on the first Trading Day immediately following the last Trading Day of each Pricing Period, the Company shall file with the Commission a Prospectus Supplement pursuant to Rule 424(b) under the Securities Act disclosing the number of Shares to be issued and sold to the Investor thereunder, the total purchase price therefor and the net proceeds to be received by the Company therefrom and, to the extent required by the Securities Act, identifying the Current Report.

ARTICLE II

FIXED REQUEST TERMS; OPTIONAL AMOUNT

Subject to the satisfaction of the conditions set forth in this Agreement, the parties agree (unless otherwise mutually agreed upon by the parties in writing) as follows:

Section 2.1 Fixed Request Notice . Upon two Trading Days’ prior written notice to the Investor, the Company may, from time to time in its sole discretion, provide a notice to the Investor of a Fixed Request before 9:30 a.m. (New York time) on the first Trading Day of the Pricing Period (the “ Fixed Request Notice ”), substantially in the form attached hereto as Exhibit

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A . The Fixed Request Notice shall specify the Fixed Amount Requested, establish the Threshold Price for such Fixed Request, designate the first Trading Day of the Pricing Period and specify the Optional Amount, if any, that the Company elects to grant to the Investor during the Pricing Period and the applicable Threshold Price for such Optional Amount (the “ Optional Amount Threshold Price ”). The Threshold Price and the Optional Amount Threshold Price established by the Company in a Fixed Request Notice may be the same or different, in the Company’s sole discretion. Upon the terms and subject to the conditions of this Agreement, the Investor is obligated to accept each Fixed Request Notice prepared and delivered in accordance with the provisions of this Agreement.

Section 2.2 Fixed Requests . From time to time during the Investment Period, the Company may in its sole discretion deliver to the Investor a Fixed Request Notice for a specified Fixed Amount Requested, and the applicable discount price (the “ Discount Price ”) shall be determined, in accordance with the price and share amount parameters as set forth below or such other parameters mutually agreed upon by the Investor and the Company, and upon the terms and subject to the conditions of this Agreement, the Investor shall purchase from the Company the Shares subject to such Fixed Request Notice; provided , however , that (i) if an ex-dividend date is established by the Trading Market in respect of the Common Stock on or between the first Trading Day of the applicable Pricing Period and the applicable Settlement Date, the Discount Price shall be reduced by the per share dividend amount and (ii) the Company may not deliver any single Fixed Request Notice for a Fixed Amount Requested in excess of the lesser of (a) the amount in the applicable Fixed Amount Requested column below and (b) 2.5% of the Market Capitalization:

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Anything to the contrary in this Agreement notwithstanding, at no time shall the Investor be required to purchase more than $12,500,000 worth of Common Stock in respect of any Pricing Period (not including Common Stock subject to any Optional Amount). The date on which the Company delivers any Fixed Request Notice in accordance with this Section 2.2 hereinafter shall be referred to as a “ Fixed Request Exercise Date ”.

Section 2.3 Share Calculation . Subject to Section 2.6, the number of Shares to be issued by the Company to the Investor pursuant to a Fixed Request shall equal the aggregate sum of each quotient (calculated for each Trading Day during the applicable Pricing Period for which the VWAP equals or exceeds the Threshold Price) determined pursuant to the following equation (rounded to the nearest whole Share):

Section 2.4 Limitation of Fixed Requests . The Company shall not make more than one Fixed Request in each Pricing Period. Not less than five Trading Days shall elapse between the end of one Pricing Period and the commencement of any other Pricing Period during the Investment Period. There shall be permitted a maximum of 24 Fixed Requests during the Investment Period. Each Fixed Request automatically shall expire immediately following the last Trading Day of each Pricing Period.

Section 2.5 Reduction of Commitment . On the last Trading Day of each Pricing Period, the Investor’s Total Commitment under this Agreement automatically (and without the need for any amendment to this Agreement) shall be reduced, on a dollar-for-dollar basis, by the total amount of the Fixed Request Amount and the Optional Amount Dollar Amount, if any, for such Pricing Period paid to the Company at the Settlement Date.

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Section 2.6 Below Threshold Price . If the VWAP on any Trading Day in a Pricing Period is lower than the Threshold Price, then for each such Trading Day the total amount of the Fixed Amount Requested shall be reduced, on a dollar-for-dollar basis, by an amount equal to the product of (x) the Multiplier and (y) the original Fixed Amount Requested, and no Shares shall be purchased or sold with respect to such Trading Day, except as provided below. If trading in the Common Stock on NASDAQ (or any national securities exchange on which the Common Stock is then listed) is suspended for any reason for more than three hours on any Trading Day, the Investor may at its option deem the price of the Common Stock to be lower than the Threshold Price for such Trading Day and, for each such Trading Day, the total amount of the Fixed Amount Requested shall be reduced as provided in the immediately preceding sentence, and no Shares shall be purchased or sold with respect to such Trading Day, except as provided below. For each Trading Day during a Pricing Period on which the VWAP is (or is deemed to be) lower than the Threshold Price, the Investor may in its sole discretion elect to purchase such U.S. dollar amount of Shares equal to the amount by which the Fixed Amount Requested has been reduced in accordance with this Section 2.6, at the Threshold Price multiplied by the applicable percentage determined in accordance with the price and share amount parameters set forth in Section 2.2. The Investor shall inform the Company via facsimile transmission not later than 8:00 p.m. (New York time) on the last Trading Day of such Pricing Period as to the number of Shares, if any, the Investor elects to purchase as provided in this Section 2.6.

Section 2.7 Settlement . The payment for, against simultaneous delivery of, Shares in respect of each Fixed Request shall be settled on the second Trading Day next following the last Trading Day of each Pricing Period, or on such earlier date as the parties may mutually agree (the “ Settlement Date ”). On each Settlement Date, the Company shall deliver the Shares purchased by the Investor to the Investor or its designees via DTC’s Deposit Withdrawal Agent Commission (DWAC) system, against simultaneous payment therefor to the Company’s designated account by wire transfer of immediately available funds, provided that if the Shares are received by the Investor later than 1:00 p.m. (New York time), payment therefor shall be made with next day funds. As set forth in Section 9.1(ii), a failure by the Company to deliver such Shares shall result in the payment of liquidated damages by the Company to the Investor.

Section 2.8 Reduction of Pricing Period . If during a Pricing Period the Company elects to reduce the number of Trading Days in such Pricing Period (and thereby amend its previously delivered Fixed Request Notice), the Company shall so notify the Investor before 9:00 a.m. (New York time) on any Trading Day during a Pricing Period (a “ Reduction Notice ”) and the last Trading Day of such Pricing Period shall be the Trading Day immediately preceding the Trading Day on which the Investor received such Reduction Notice; provided , however , that if the Company delivers the Reduction Notice later than 9:00 a.m. (New York time) on a Trading Day during a Pricing Period, then the last Trading Day of such Pricing Period instead shall be the Trading Day on which the Investor received such Reduction Notice.

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Upon receipt of a Reduction Notice, the Investor (i) shall purchase the Shares in respect of each Trading Day in such reduced Pricing Period for which the VWAP equals or exceeds the Threshold Price in accordance with Section 2.3 hereof; (ii) may elect to purchase the Shares in respect of any Trading Day in such reduced Pricing Period for which the VWAP is (or is deemed to be) lower than the Threshold Price in accordance with Section 2.6 hereof; and (iii) may elect to exercise all or any portion of an Optional Amount on any Trading Day during such reduced Pricing Period in accordance with Sections 2.10 and 2.11 hereof.

In addition, upon receipt of a Reduction Notice, the Investor may elect to purchase such U.S. dollar amount of additional Shares equal to the quotient determined pursuant to the following equation:

at a per Share price equal to (x) the Fixed Amount Requested attributable to the reduced Pricing Period divided by (y) the number of Shares to be purchased during such reduced Pricing Period pursuant to clause (i) of the immediately preceding paragraph.

The Investor may also elect to exercise any portion of the applicable Optional Amount which was unexercised during the reduced Pricing Period by issuing an Optional Amount Notice to the Company not later than 10:00 a.m. (New York time) on the first Trading Day next following the last Trading Day of the reduced Pricing Period. The number of Shares to be issued upon exercise of such Optional Amount shall be calculated pursuant to the equation set forth in Section 2.10 hereof, except that “C” shall equal the greater of (i) the VWAP for the Common Stock on the last Trading Day of the reduced Pricing Period or (ii) the Optional Amount Threshold Price.

The payment for, against simultaneous delivery of, Shares to be purchased and sold in accordance with this Section 2.8 shall be settled on the second Trading Day next following the Trading Day on which the Investor receives a Reduction Notice.

Section 2.9 Optional Amount . With respect to any Pricing Period, the Company may in its sole discretion grant to the Investor the right to exercise, from time to time during the Pricing Period (but not more than once on any Trading Day), all or any portion of an Optional Amount. The maximum Optional Amount Dollar Amount and the Optional Amount Threshold Price shall be set forth in the Fixed Request Notice. If an ex-dividend date is established by the Trading Market in respect of the Common Stock on or between the first Trading Day of the applicable Pricing Period and the applicable Settlement Date, the applicable exercise price in

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respect of the Optional Amount shall be reduced by the per share dividend amount. Each daily Optional Amount exercise shall be aggregated during the Pricing Period and settled on the next Settlement Date. The Optional Amount Threshold Price designated by the Company in its Fixed Request Notice shall apply to each Optional Amount during the applicable Pricing Period.

Section 2.10 Calculation of Optional Amount Shares . The number of shares of Common Stock to be issued in connection with the exercise of an Optional Amount shall be the quotient determined pursuant to the following equation (rounded to the nearest whole Share):

Section 2.11 Exercise of Optional Amount . If granted by the Company to the Investor with respect to a Pricing Period, all or any portion of the Optional Amount may be exercised by the Investor on any Trading Day during the Pricing Period, subject to the limitations set forth in Section 2.9. As a condition to each exercise of an Optional Amount pursuant to this Section 2.11, the Investor shall issue an Optional Amount Notice to the Company no later than 8:00 p.m. (New York time) on the day of such Optional Amount exercise. If the Investor does not exercise an Optional Amount in full by 8:00 p.m. (New York time) on the last Trading Day of the applicable Pricing Period, such unexercised portion of the Investor’s Optional Amount with respect to that Pricing Period automatically shall lapse and terminate.

Section 2.12 Aggregate Limit . Notwithstanding anything to the contrary contained in this Agreement, in no event may the Company issue a Fixed Request Notice or grant an Optional Amount to the extent that the sale of Shares pursuant thereto and pursuant to all prior Fixed Request Notices and Optional Amounts issued hereunder, and as liquidated damages pursuant to Section 9.1(ii), would cause the Company to sell or the Investor to purchase Shares which in the aggregate are in excess of the Aggregate Limit. If the Company issues a Fixed Request Notice or Optional Amount that otherwise would permit the Investor to purchase shares of Common Stock which would cause the aggregate purchases by Investor hereunder to exceed the Aggregate Limit, such Fixed Request Notice or Optional Amount shall be void ab initio to the extent of the amount by which the dollar value of shares or number of shares, as the case may be, of Common Stock otherwise issuable pursuant to such Fixed Request Notice or Optional Amount together with the dollar value of shares or number of shares, as the case may be, of all other Common Stock purchased by the Investor pursuant hereto would exceed the Aggregate Limit. The

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Company hereby represents, warrants and covenants that neither it nor any of its Subsidiaries (i) has effected any transaction or series of transactions, (ii) is a party to any pending transaction or series of transactions or (iii) shall enter into any contract, agreement, agreement-in-principle, arrangement or understanding with respect to, or shall effect, any Other Financing which, in any of such cases, may be integrated with the transactions contemplated by this Agreement for purposes of determining whether approval of the Company’s stockholders is required under any bylaw, listed securities maintenance standards or other rules of the Trading Market; provided , however , that the Company shall be permitted to take any action referred to in clause (iii) above if the Company has timely provided the Investor with an Integration Notice as provided in Section 5.6(ii) hereof.

At the Company’s sole discretion, and effective automatically upon receipt by the Investor of notice thereof from the Company, this Agreement may be amended by the Company from time to time to reduce the Aggregate Limit by a specified dollar amount of Common Stock which shall be no greater than is required to enable the Company to utilize the Registration Statement to consummate an underwritten public offering of Common Stock or a registered direct public offering of Common Stock during the Investment Period); provided , however , that any such amendment of this Agreement (and any such purported amendment) shall be void and of no force and effect if the effect thereof would restrict, materially delay, conflict with or impair the ability or right of the Company to perform its obligations under this Agreement, including, without limitation, the obligation of the Company to deliver Shares to the Investor in respect of a Fixed Request or Optional Amount on the applicable Settlement Date. In the event the Company shall have elected to reduce the Aggregate Limit as provided in the immediately preceding sentence, at the Company’s sole discretion, and effective automatically upon receipt by the Investor of notice thereof from the Company, the Company may subsequently amend this Agreement to increase the Aggregate Limit; provided , however , that in no event shall the Aggregate Limit thereby be increased to an amount greater than the amount obtained by subtracting (x) the aggregate of all Fixed Request Amounts and Optional Amount Dollar Amounts (including any amounts paid as liquidated damages pursuant to Section 9.1(ii) hereunder) covered by all Fixed Requests and Optional Amounts theretofore issued or granted by the Company in respect of which a settlement has occurred pursuant to Section 2.7 from (y) $100,000,000, subject in all cases to the Trading Market Limit.

ARTICLE III

REPRESENTATIONS AND WARRANTIES OF THE INVESTOR

The Investor hereby makes the following representations and warranties to the Company:

Section 3.1 Organization and Standing of the Investor . The Investor is an international business company duly organized, validly existing and in good standing under the laws of the British Virgin Islands.

Section 3.2 Authorization and Power . The Investor has the requisite corporate power and authority to enter into and perform its obligations under this Agreement and to purchase the Shares in accordance with the terms hereof. The execution, delivery and performance of this Agreement by the Investor and the consummation by it of the transactions

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contemplated hereby have been duly authorized by all necessary corporate action, and no further consent or authorization of the Investor, its Board of Directors or stockholders is required. This Agreement has been duly executed and delivered by the Investor. This Agreement constitutes a valid and binding obligation of the Investor enforceable against it in accordance with its terms, except as such enforceability may be limited by applicable bankruptcy, insolvency, reorganization, moratorium, liquidation, conservatorship, receivership, or similar laws relating to, or affecting generally the enforcement of, creditor’s rights and remedies or by other equitable principles of general application.

Section 3.3 No Conflicts . The execution, delivery and performance by the Investor of this Agreement and the consummation by the Investor of the transactions contemplated herein do not and shall not (i) result in a violation of such Investor’s charter documents, bylaws or other applicable organizational instruments, (ii) conflict with, constitute a default (or an event which, with notice or lapse of time or both, would become a default) under, or give rise to any rights of termination, amendment, acceleration or cancellation of, any material agreement, mortgage, deed of trust, indenture, note, bond, license, lease agreement, instrument or obligation to which the Investor is a party or is bound, (iii) create or impose any lien, charge or encumbrance on any property of the Investor under any agreement or any commitment to which the Investor is party or under which the Investor is bound or under which any of its properties or assets are bound, or (iv) result in a violation of any federal, state, local or foreign statute, rule, or regulation, or any order, judgment or decree of any court or governmental agency applicable to the Investor or by which any of its properties or assets are bound or affected, except, in the case of clauses (ii), (iii) and (iv), for such conflicts, defaults, terminations, amendments, acceleration, cancellations and violations as would not, individually or in the aggregate, prohibit or otherwise interfere with the ability of the Investor to enter into and perform its obligations under this Agreement in any material respect. The Investor is not required under federal, state, local or foreign law, rule or regulation to obtain any consent, authorization or order of, or make any filing or registration with, any court or governmental agency in order for it to execute, deliver or perform any of its obligations under this Agreement or to purchase the Shares in accordance with the terms hereof.

Section 3.4 Information . The Investor and its advisors have been furnished with all materials relating to the business, financial condition, management and operations of the Company and materials relating to the offer and sale of the Shares which have been requested by the Investor. The Investor and its advisors have been afforded the opportunity to ask questions of representatives of the Company. The Investor has sought such accounting, legal and tax advice as it has considered necessary to make an informed investment decision with respect to its acquisition of the Shares. The Investor understands that it (and not the Company) shall be responsible for its own tax liabilities that may arise as a result of this investment or the transactions contemplated by this Agreement.

Section 3.5 Broker-Dealer . The Broker-Dealer will receive commissions from the Investor which shall not exceed customary brokerage commissions.

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ARTICLE IV

REPRESENTATIONS AND WARRANTIES OF THE COMPANY

Except as set forth in the disclosure schedule delivered by the Company to the Investor (which is hereby incorporated by reference in, and constitutes an integral part of, this Agreement) (the “ Disclosure Schedule ”), the Company hereby makes the following representations and warranties to the Investor:

Section 4.1 Organization, Good Standing and Power . The Company is a corporation duly organized, validly existing and in good standing under the laws of the State of Delaware and has the requisite corporate power and authority to own, lease and operate its properties and assets and to conduct its business as it is now being conducted. The Company and each Subsidiary is duly qualified as a foreign corporation to do business and is in good standing in every jurisdiction in which the nature of the business conducted or property owned by it makes such qualification necessary, except for any jurisdiction in which the failure to be so qualified would not have a Material Adverse Effect.

Section 4.2 Authorization, Enforcement . The Company has the requisite corporate power and authority to enter into and perform this Agreement and to issue and sell the Shares in accordance with the terms hereof. Except for approvals of the Company’s Board of Directors or a committee thereof as may be required in connection with any issuance and sale of Shares to the Investor hereunder (which approvals shall be obtained prior to the delivery of any Fixed Request Notice), the execution, delivery and performance by the Company of this Agreement and the consummation by it of the transactions contemplated hereby have been duly and validly authorized by all necessary corporate action and no further consent or authorization of the Company or its Board of Directors or stockholders is required. This Agreement has been duly executed and delivered by the Company and constitutes a valid and binding obligation of the Company enforceable against the Company in accordance with its terms, except as such enforceability may be limited by applicable bankruptcy, insolvency, reorganization, moratorium, liquidation, conservatorship, receivership or similar laws relating to, or affecting generally the enforcement of, creditor’s rights and remedies or by other equitable principles of general application.

Section 4.3 Capitalization . The authorized capital stock of the Company and the shares thereof issued and outstanding are as set forth in the Commission Documents as of the dates reflected therein. All of the outstanding shares of Common Stock have been duly authorized and validly issued, and are fully paid and nonassessable. Except as set forth in the Commission Documents, as of the Effective Date, no shares of Common Stock were entitled to preemptive rights or registration rights and there were no outstanding options, warrants, scrip, rights to subscribe to, call or commitments of any character whatsoever relating to, or securities or rights convertible into or exchangeable for, any shares of capital stock of the Company. Except as set forth in the Commission Documents, there were no contracts, commitments, understandings, or arrangements by which the Company is or may become bound to issue additional shares of the capital stock of the Company or options, securities or rights convertible into or exchangeable for any shares of capital stock of the Company. Except for customary transfer restrictions contained in agreements entered into by the Company to sell restricted

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securities or as set forth in the Commission Documents, as of the Effective Date, the Company was not a party to, and it had no knowledge of, any agreement restricting the voting or transfer of any shares of the capital stock of the Company. Except as set forth in the Commission Documents, the offer and sale of all capital stock, convertible or exchangeable securities, rights, warrants or options of the Company issued prior to the Effective Date complied with all applicable federal and state securities laws, and no stockholder has any right of rescission or damages or any “put” or similar right with respect thereto which would have a Material Adverse Effect. The Company has furnished or made available to the Investor via the Commission’s Electronic Data Gathering, Analysis and Retrieval System (“ EDGAR ”) true and correct copies of the Company’s Certificate of Incorporation as in effect on the Effective Date (the “ Charter ”), and the Company’s Bylaws as in effect on the Effective Date (the “ Bylaws ”), and true and correct copies (redacted as appropriate) of all executed resolutions of the Company’s Board of Directors (and committees thereof) relating to the capital stock of the Company (and transactions in respect thereof) since December 31, 2004 (except with respect to issuances of shares of capital stock of the Company to directors or employees of, or other service providers to, the Company as fees or compensation that were duly approved by the Company’s Board of Directors or a committee thereof).

Section 4.4 Issuance of Shares . The Shares to be issued under this Agreement have been or will be duly authorized by all necessary corporate action and, when paid for or issued in accordance with the terms hereof, the Shares shall be validly issued and outstanding, fully paid and nonassessable, and, when the Shares have been issued to the Investor, the Investor shall be entitled to all rights accorded to a holder and beneficial owner of Common Stock.

Section 4.5 No Conflicts . The execution, delivery and performance by the Company of this Agreement and the consummation by the Company of the transactions contemplated herein do not and shall not (i) result in a violation of any provision of the Company’s Charter or Bylaws, (ii) conflict with, constitute a default (or an event which, with notice or lapse of time or both, would become a default) under, or give rise to any rights of termination, amendment, acceleration or cancellation of, any material agreement, mortgage, deed of trust, indenture, note, bond, license, lease agreement, instrument or obligation to which the Company or any of its Significant Subsidiaries is a party or is bound (including, without limitation, any listing agreement with the Trading Market), (iii) create or impose a lien, charge or encumbrance on any property of the Company or any of its Significant Subsidiaries under any agreement or any commitment to which the Company or any of its Significant Subsidiaries is a party or under which the Company or any of its Significant Subsidiaries is bound or under which any of their respective properties or assets are bound, or (iv) result in a violation of any federal, state, local or foreign statute, rule, regulation, order, judgment or decree applicable to the Company or any of its Subsidiaries or by which any property or asset of the Company or any of its Subsidiaries are bound or affected, except, in the case of clauses (ii), (iii) and (iv), for such conflicts, defaults, terminations, amendments, acceleration, cancellations, liens, charges, encumbrances and violations as would not, individually or in the aggregate, have a Material Adverse Effect. The Company is not required under federal, state, local or foreign law, rule or regulation to obtain any consent, authorization or order of, or make any filing or registration with, any court or governmental agency in order for it to execute, deliver or perform any of its obligations under this Agreement, or to issue and sell the Shares to the Investor in accordance with the terms

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hereof (other than any filings which may be required to be made by the Company with the Commission or the Trading Market subsequent to the Effective Date, including but not limited to a Prospectus Supplement under Sections 1.4 and 5.9 of this Agreement, and any registration statement, prospectus or prospectus supplement which has been or may be filed pursuant to this Agreement).

Section 4.6 Commission Documents, Financial Statements . (a) The Common Stock is registered pursuant to Section 12(b) or 12(g) of the Exchange Act and, except as disclosed in the Commission Documents, as of the Effective Date the Company had timely filed (giving effect to permissible extensions in accordance with Rule 12b-25 under the Exchange Act) all Commission Documents. The Company has delivered or made available to the Investor via EDGAR or otherwise true and complete copies of the Commission Documents filed with the Commission prior to the Effective Date (including, without limitation, the 2006 Form 10-KSB) and has delivered or made available to the Investor via EDGAR or otherwise true and complete copies of all of the Commission Documents heretofore incorporated by reference in the Registration Statement and the Prospectus. The Company has not provided to the Investor any information which, according to applicable law, rule or regulation, should have been disclosed publicly by the Company but which has not been so disclosed, other than with respect to the transactions contemplated by this Agreement. As of its filing date, each Commission Document filed with the Commission and incorporated by reference in the Registration Statement and the Prospectus (including, without limitation, the 2006 Form 10-KSB) complied in all material respects with the requirements of the Securities Act or the Exchange Act, as applicable, and other federal, state and local laws, rules and regulations applicable to it, and, as of its filing date, such Commission Document did not contain any untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary in order to make the statements therein, in light of the circumstances under which they were made, not misleading. Each Commission Document to be filed with the Commission after the Effective Date and incorporated by reference in the Registration Statement, the Prospectus and any Prospectus Supplement required to be filed pursuant to Sections 1.4 and 5.9 hereof during the Investment Period (including, without limitation, the Current Report), when such document becomes effective or is filed with the Commission, as the case may be, shall comply in all material respects with the requirements of the Securities Act or the Exchange Act, as applicable, and other federal, state and local laws, rules and regulations applicable to it, and shall not contain any untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary in order to make the statements therein, in light of the circumstances under which they were made, not misleading.

(b) The financial statements, together with the related notes and schedules, of the Company included in the Commission Documents comply as to form in all material respects with all applicable accounting requirements and the published rules and regulations of the Commission and all other applicable rules and regulations with respect thereto. Such financial statements, together with the related notes and schedules, have been prepared in accordance with GAAP applied on a consistent basis during the periods involved (except (i) as may be otherwise indicated in such financial statements or the notes thereto or (ii) in the case of unaudited interim statements, to the extent they may not include footnotes or may be condensed or summary statements), and fairly present in all material respects the financial condition of the Company and

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its consolidated Subsidiaries as of the dates thereof and the results of operations and cash flows for the periods then ended (subject, in the case of unaudited statements, to normal year-end audit adjustments).

(c) The Company has timely filed with the Commission and made available to the Investor via EDGAR or otherwise all certifications and statements required by (x) Rule 13a-14 or Rule 15d-14 under the Exchange Act or (y) 18 U.S.C. Section 1350 (Section 906 of the Sarbanes-Oxley Act of 2002 (“ SOXA ”)) with respect to all relevant Commission Documents. The Company is in compliance in all material respects with the provisions of SOXA applicable to it as of the date hereof. The Company maintains disclosure controls and procedures required by Rule 13a-15 or Rule 15d-15 under the Exchange Act; such controls and procedures are effective to ensure that all material information concerning the Company and its Subsidiaries is made known on a timely basis to the individuals responsible for the timely and accurate preparation of the Company’s Commission filings and other public disclosure documents. As used in this Section 4.6(c), the term “file” shall be broadly construed to include any manner in which a document or information is furnished, supplied or otherwise made available to the Commission.

(d) Singer Lewak Greenbaum & Goldstein LLP, who have expressed their opinions on the audited financial statements and related schedules included or incorporated by reference in the Registration Statement and the Base Prospectus are, with respect to the Company, independent public accountants as required by the Securities Act and is an independent registered public accounting firm within the meaning of SOXA as required by the rules of the Public Company Accounting Oversight Board.

Section 4.7 Subsidiaries . The 2006 Form 10-KSB sets forth each Subsidiary of the Company as of the Effective Date, showing its jurisdiction of incorporation or organization and the percentage of the Company’s ownership of the outstanding capital stock or other ownership interests of such Subsidiary, and the Company does not have any other Subsidiaries as of the Effective Date.

Section 4.8 No Material Adverse Effect . Since December 31, 2006, the Company has not experienced or suffered any Material Adverse Effect, and there exists no current state of facts, condition or event which would have a Material Adverse Effect, except (i) as disclosed in any Commission Documents filed since December 31, 2006 or (ii) continued losses from operations.

Section 4.9 Indebtedness . The Company’s Quarterly Report on Form 10-QSB for its fiscal quarter ended June 30, 2007 sets forth, as of June 30, 2007, all outstanding secured and unsecured Indebtedness of the Company or any Subsidiary, or for which the Company or any Subsidiary has commitments through such date. For the purposes of this Agreement, “ Indebtedness ” shall mean (a) any liabilities for borrowed money or amounts owed in excess of $1,000,000 (other than trade accounts payable incurred in the ordinary course of business), (b) all guaranties, endorsements, indemnities and other contingent obligations in respect of Indebtedness of others in excess of $1,000,000, whether or not the same are or should be reflected in the Company’s balance sheet (or the notes thereto), except guaranties by

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endorsement of negotiable instruments for deposit or collection or similar transactions in the ordinary course of business; and (c) the present value of any lease payments in excess of $1,000,000 due under leases required to be capitalized in accordance with GAAP. There is no existing or continuing default or event of default in respect of any Indebtedness of the Company or any of its Subsidiaries.

Section 4.10 Title To Assets . Each of the Company and its Subsidiaries has good and marketable title to all of their respective real and personal property reflected in the Commission Documents, free of mortgages, pledges, charges, liens, security interests or other encumbrances, except for those indicated in the Commission Documents or those that would not have a Material Adverse Effect. All real property leases of the Company are valid and subsisting and in full force and effect in all material respects.

Section 4.11 Actions Pending . There is no action, suit, claim, investigation or proceeding pending, or to the knowledge of the Company threatened, against the Company or any Subsidiary which questions the validity of this Agreement or the transactions contemplated hereby or any action taken or to be taken pursuant hereto or thereto. Except as set forth in the Commission Documents, there is no action, suit, claim, investigation or proceeding pending, or to the knowledge of the Company threatened, against or involving the Company, any Subsidiary or any of their respective properties or assets, or involving any officers or directors of the Company or any of its Subsidiaries, including, without limitation, any securities class action lawsuit or stockholder derivative lawsuit, in each case which, if determined adversely to the Company, its Subsidiary or any officer or director of the Company or its Subsidiaries, would have a Material Adverse Effect.

Section 4.12 Compliance With Law . The business of the Company and the Subsidiaries has been and is presently being conducted in compliance with all applicable federal, state, local and foreign governmental laws, rules, regulations and ordinances, except as set forth in the Commission Documents and except for such non-compliance which, individually or in the aggregate, would not have a Material Adverse Effect.

Section 4.13 Certain Fees . Except for the placement fee payable by the Company to Reedland Capital Partners, an Institutional Division of the Financial West Group, Member NASD/SIPC (“ Reedland ”), which shall be set forth in a separate placement agency agreement between the Company and Reedland (a true and complete fully executed copy of which has heretofore been provided to the Investor), no brokers, finders or financial advisory fees or commissions shall be payable by the Company or any Subsidiary (or any of their respective affiliates) with respect to the transactions contemplated by this Agreement.

Section 4.14 Operation of Business . (a) The Company or one or more of its Subsidiaries possesses such permits, licenses, approvals, consents and other authorizations (including licenses, accreditation and other similar documentation or approvals of any local health departments) (collectively, “ Governmental Licenses ”) issued by the appropriate federal, state, local or foreign regulatory agencies or bodies, including, without limitation, the United States Food and Drug Administration (“ FDA ”), necessary to conduct the business now operated by it, except where the failure to possess such Governmental Licenses, individually or in the

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aggregate, would not have a Material Adverse Effect. The Company and its Subsidiaries are in compliance with the terms and conditions of all such Governmental Licenses and all applicable FDA rules and regulations, guidelines and policies, and all applicable rules and regulations, guidelines and policies of any governmental authority exercising authority comparable to that of the FDA (including any non-governmental authority whose approval or authorization is required under foreign law comparable to that administered by the FDA), except where the failure to so comply, individually or in the aggregate, would not have a Material Adverse Effect. All of the Governmental Licenses are valid and in full force and effect, except where the invalidity of such Governmental Licenses or the failure of such Governmental Licenses to be in full force and effect, individually or in the aggregate, would not have a Material Adverse Effect. As to each product that is subject to FDA regulation or similar legal provisions in any foreign jurisdiction that is developed, manufactured, tested, packaged, labeled, marketed, sold, distributed and/or commercialized by the Company or any of its Subsidiaries, each such product is being developed, manufactured, tested, packaged, labeled, marketed, sold, distributed and/or commercialized in compliance with all applicable requirements of the FDA (and any non-governmental authority whose approval or authorization is required under foreign law comparable to that administered by the FDA), including, but not limited to, those relating to investigational use, investigational device exemption, premarket notification, premarket approval, good clinical practices, good manufacturing practices, record keeping, filing of reports, and patient privacy and medical record security, except where such non-compliance, individually or in the aggregate, would not have a Material Adverse Effect. As to each product or product candidate of the Company or any of its Subsidiaries subject to FDA regulation or similar legal provision in any foreign jurisdiction, all manufacturing facilities operated by the Company and its Subsidiaries are operated in compliance with the FDA’s Quality System Regulation requirements at 21 C.F.R. Part 820, as applicable, except where such non-compliance, individually or in the aggregate, would not have a Material Adverse Effect. Except as set forth in the Commission Documents or the Registration Statement, neither the Company nor any of its Subsidiaries has received any notice of proceedings relating to the revocation or modification of any such Governmental Licenses or relating to a potential violation of, failure to comply with, or request to produce additional information under, any FDA rules and regulations, guidelines or policies which, if the subject of any unfavorable decision, ruling or finding, individually or in the aggregate, would have a Material Adverse Effect. Except as set forth in the Commission Documents or the Registration Statement, neither the Company nor any of its Subsidiaries has received any correspondence, notice or request from the FDA, including, without limitation, notice that any one or more products or product candidates of the Company or any of its Subsidiaries failed to receive approval from the FDA for use for any one or more indications, and neither the Company nor any of its Subsidiaries knows of any basis therefor, except where such correspondence, notice or request, individually or in the aggregate, would not have a Material Adverse Effect. This Section 4.14 does not relate to environmental matters, such items being the subject of Section 4.15.

(b) Except as set forth in the Registration Statement and the Commission Documents, to the knowledge of the Company, the Company or one or more of its Subsidiaries owns or possesses adequate patents, patent rights, licenses, inventions, copyrights, know-how (including trade secrets and other unpatented and/or unpatentable proprietary or confidential information, systems or procedures), trademarks, service marks, trade names, trade dress, logos,

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copyrights and other intellectual property, including, without limitation, all of the intellectual property described in the Commission Documents as being owned or licensed by the Company (collectively, “ Intellectual Property ”), necessary to carry on the business now operated by it. Except as set forth in the Commission Documents, there are no actions, suits or judicial proceedings pending, or to the Company’s knowledge threatened, relating to patents or proprietary information to which the Company or any of its Subsidiaries is a party or of which any property of the Company or any of its Subsidiaries is subject, and neither the Company nor any of its Subsidiaries has received any notice or is otherwise aware of any infringement of or conflict with asserted rights of others with respect to any Intellectual Property or of any facts or circumstances which could render any Intellectual Property invalid or inadequate to protect the interest of the Company and its Subsidiaries therein, and which infringement or conflict (if the subject of any unfavorable decision, ruling or finding) or invalidity or inadequacy, individually or in the aggregate, would have a Material Adverse Effect.

(c) All pre-clinical and clinical trials conducted by, or on behalf of, the Company or any of its Subsidiaries, or in which the Company or any of its Subsidiaries has participated that are described in the Registration Statement or the Commission Documents, or the results of which are referred to in the Registration Statement or the Commission Documents, have been conducted in compliance with all applicable federal, state, local and foreign laws, and the regulations and requirements of any applicable governmental entity, including, but not limited to, FDA good clinical practice and good laboratory practice requirements, except for such non-compliance as would not, individually or in the aggregate, have a Material Adverse Effect. Except as set forth in the Registration Statement or the Commission Documents, neither the Company nor any of its Subsidiaries has received any notices or correspondence from the FDA or any other governmental agency requiring the termination, suspension, delay or modification of any pre-clinical or clinical trials conducted by, or on behalf of, the Company or any of its Subsidiaries or in which the Company or any of its Subsidiaries has participated that are described in the Registration Statement or the Commission Documents, if any, or the results of which are referred to in the Registration Statement or the Commission Documents, except for such termination, suspension, delay or modification as would not, individually or in the aggregate, have a Material Adverse Effect. All pre-clinical and clinical trials previously conducted by, or on behalf of, the Company or any of its Subsidiaries while conducted by or on behalf of the Company or any of its Subsidiaries, were conducted in compliance with all applicable federal, state, local and foreign laws, and the regulations and requirements of any applicable governmental entity, including, but not limited to, FDA good clinical practice and good laboratory practice requirements, except for such non-compliance as would not, individually or in the aggregate, have a Material Adverse Effect.

Section 4.15 Environmental Compliance . Except as disclosed in the Commission Documents, the Company and each of its Subsidiaries have obtained all material approvals, authorization, certificates, consents, licenses, orders and permits or other similar authorizations of all governmental authorities, or from any other person, that are required under any Environmental Laws, except for any approvals, authorization, certificates, consents, licenses, orders and permits or other similar authorizations the failure of which to obtain does not or would not have a Material Adverse Effect. “ Environmental Laws ” shall mean all applicable laws relating to the protection of the environment including, without limitation, all requirements

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pertaining to reporting, licensing, permitting, controlling, investigating or remediating emissions, discharges, releases or threatened releases of hazardous substances, chemical substances, pollutants, contaminants or toxic substances, materials or wastes, whether solid, liquid or gaseous in nature, into the air, surface water, groundwater or land, or relating to the manufacture, processing, distribution, use, treatment, storage, disposal, transport or handling of hazardous substances, chemical substances, pollutants, contaminants or toxic substances, material or wastes, whether solid, liquid or gaseous in nature. Except for such instances as would not, individually or in the aggregate, have a Material Adverse Effect, to the best of the Company’s knowledge, there are no past or present events, conditions, circumstances, incidents, actions or omissions relating to or in any way affecting the Company or its Subsidiaries that violate or could reasonably be expected to violate any Environmental Law after the Effective Date or that could reasonably be expected to give rise to any environmental liability, or otherwise form the basis of any claim, action, demand, suit, proceeding, hearing, study or investigation (i) under any Environmental Law, or (ii) based on or related to the manufacture, processing, distribution, use, treatment, storage (including without limitation underground storage tanks), disposal, transport or handling, or the emission, discharge, release or threatened release of any hazardous substance.

Section 4.16 Material Agreements . Except as set forth in the Commission Documents, neither the Company nor any Subsidiary of the Company is a party to any written or oral