Document:

<PAGE>   1
                                                                     EXHIBIT 4.1

                         [PAIN THERAPEUTICS, INC. LOGO]

                            PAIN THERAPEUTICS, INC.

              INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE

                                  COMMON STOCK

                                                              SEE REVERSE FOR
                                                            CERTAIN DEFINITIONS
                                                             CUSIP 695621 00 7
THIS CERTIFIES THAT

is the owner of

FULLY PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK, PAR VALUE $0.001 EACH, OF

=========================== PAIN THERAPEUTICS, INC. ============================

(hereinafter called the "Corporation") transferable on the books of the
Corporation by the holder hereof in person or by duly authorized attorney upon
surrender of this certificate properly endorsed. This certificate and the shares
represented hereby are issued and shall be held subject to all of the provisions
of the Certificate of Incorporation and the By-Laws, as from time to time
amended, of the Corporation (copies of which are on file at the office of the
Transfer Agent), and the holder hereof, by acceptance of this certificate,
consents to and agrees to be bound by all of said provisions. This certificate
is not valid unless countersigned and registered by the Transfer Agent and
Registrar.

     WITNESS the facsimile seal of the Corporation and the facsimile signatures
of its duly authorized officers.

Dated:

                    [PAIN THERAPEUTICS, INC. CORPORATE SEAL]

/s/ MICHAEL J. O'DONNELL                                            REMI BARBIER

               SECRETARY                  PRESIDENT, CHIEF EXECUTIVE OFFICER AND
                                          CHAIRMAN OF THE BOARD OF DIRECTORS

COUNTERSIGNED AND REGISTERED:
     CHASEMELLON SHAREHOLDER SERVICES, L.L.C.

BY                  TRANSFER AGENT AND REGISTRAR

                    AUTHORIZED SIGNATURE
<PAGE>   2
                            PAIN THERAPEUTICS, INC.

     THE COMPANY WILL FURNISH WITHOUT CHARGE TO EACH STOCKHOLDER WHO SO
REQUESTS, A COPY OF THE DESIGNATIONS, POWERS, PREFERENCES AND RELATIVE,
PARTICIPATING, OPTIONAL OR OTHER SPECIAL RIGHTS OF EACH CLASS OF STOCK OR
SERIES THEREOF AND THE QUALIFICATIONS, LIMITATIONS OR RESTRICTIONS OF SUCH
PREFERENCES AND/OR RIGHTS. ANY SUCH REQUESTS MAY BE ADDRESSED TO THE SECRETARY
OF THE CORPORATION.

     The following abbreviations, when used in the inscription on the face of
this certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

<TABLE>
<S>                                               <C>
     TEN COM  --as tenants in common              UNIF GIFT MIN ACT- _________ Custodian _________
     TEN ENT  --as tenants by the entireties                          (Cust)              (Minor)
     JT TEN   --as joint tenants with right of                       under Uniform Gifts to Minors
                survivorship and not as tenants                      Act ____________
                in common                                                  (State)
</TABLE>

    Additional abbreviations may also be used though not in the above list.

 For Value Received, ____________________ hereby sell, assign and transfer unto

PLEASE INSERT SOCIAL SECURITY OR OTHER
  IDENTIFYING NUMBER OF ASSIGNEE.
---------------------------------------

---------------------------------------

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(PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP OR POSTAL CODE OF
 ASSIGNEE)

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Shares of the Common Stock represented by the within certificate and do hereby
irrevocably constitute and appoint

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Attorney to transfer the said stock on the books of the within named
Corporation with full power of substitution in the premises.

Dated
     -------------------------

               -----------------------------------------------------------------
                       THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE
                       NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY
               NOTICE: PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT OR ANY
                       CHANGE WHATEVER

Signature(s) Guaranteed:

---------------------------------------------
THE SIGNATURE(S) MUST BE GUARANTEED BY AN
ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS,
SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH
MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION
PROGRAM), PURSUANT TO SEC RULE 17Ad-15

KEEP THIS CERTIFICATE IN A SAFE PLACE. IF IT IS LOST, STOLEN, MUTILATED OR
DESTROYED, THE CORPORATION WILL REQUIRE A BOND OF INDEMNITY AS A CONDITION TO
THE ISSUANCE OF A REPLACEMENT CERTIFICATE.<PAGE>   1
                                                                    EXHIBIT 10.5

                            PAIN THERAPEUTICS, INC.

                                 1998 STOCK PLAN

                    (AMENDED AND RESTATED AS OF ______, 2000)

        1. Purposes of the Plan. The purposes of this 1998 Stock Plan are:

               -       to attract and retain the best available personnel for
                       positions of substantial responsibility,

               -       to provide additional incentive to Employees, Directors
                       and Consultants, and

               -       to promote the success of the Company's business.

               Options granted under the Plan may be Incentive Stock Options or
Nonstatutory Stock Options, as determined by the Administrator at the time of
grant.

        2. Definitions. As used herein, the following definitions shall apply:

               (a) "Administrator" means the Board or any of its Committees as
shall be administering the Plan, in accordance with Section 4 of the Plan.

               (b) "Applicable Laws" means the requirements relating to the
administration of stock option plans under U. S. state corporate laws, U.S.
federal and state securities laws, the Code, any stock exchange or quotation
system on which the Common Stock is listed or quoted and the applicable laws of
any other country or jurisdiction where Options are granted under the Plan.

               (c) "Board" means the Board of Directors of the Company.

               (d) "Code" means the Internal Revenue Code of 1986, as amended.

               (e) "Committee" means a committee of Directors appointed by the
Board in accordance with Section 4 of the Plan.

               (f) "Common Stock" means the common stock of the Company.

               (g) "Company" means Pain Therapeutics, Inc., a Delaware
Corporation.

               (h) "Consultant" means any natural person, including an advisor,
engaged by the Company or a Parent or Subsidiary to render services to such
entity.

               (i) "Director" means a member of the Board.

               (j) "Disability" means total and permanent disability as defined
in Section 22(e)(3) of the Code.

<PAGE>   2

               (k) "Employee" means any person, including Officers and
Directors, employed by the Company or any Parent or Subsidiary of the Company. A
Service Provider shall not cease to be an Employee in the case of (i) any leave
of absence approved by the Company or (ii) transfers between locations of the
Company or between the Company, its Parent, any Subsidiary, or any successor.
For purposes of Incentive Stock Options, no such leave may exceed ninety days,
unless reemployment upon expiration of such leave is guaranteed by statute or
contract. If reemployment upon expiration of a leave of absence approved by the
Company is not so guaranteed, then three (3) months following the 91st day of
such leave any Incentive Stock Option held by the Optionee shall cease to be
treated as an Incentive Stock Option and shall be treated for tax purposes as a
Nonstatutory Stock Option. Neither service as a Director nor payment of a
director's fee by the Company shall be sufficient to constitute "employment" by
the Company.

               (l) "Exchange Act" means the Securities Exchange Act of 1934, as
amended.

               (m) "Fair Market Value" means, as of any date, the value of
Common Stock determined as follows:

                          (i) If the Common Stock is listed on any established
stock exchange or a national market system, including without limitation the
Nasdaq National Market or The Nasdaq SmallCap Market of The Nasdaq Stock Market,
its Fair Market Value shall be the closing sales price for such stock (or the
closing bid, if no sales were reported) as quoted on such exchange or system on
the day of determination, as reported in The Wall Street Journal or such other
source as the Administrator deems reliable;

                           (ii) If the Common Stock is regularly quoted by a
recognized securities dealer but selling prices are not reported, the Fair
Market Value of a Share of Common Stock shall be the mean between the high bid
and low asked prices for the Common Stock on the day of determination, as
reported in The Wall Street Journal or such other source as the Administrator
deems reliable; or

                           (iii) In the absence of an established market for the
Common Stock, the Fair Market Value shall be determined in good faith by the
Administrator.

               (n) "Incentive Stock Option" means an Option intended to qualify
as an incentive stock option within the meaning of Section 422 of the Code and
the regulations promulgated thereunder.

               (o) "Inside Director" means a Director who is an Employee.

               (p) "Nonstatutory Stock Option" means an Option not intended to
qualify as an Incentive Stock Option.

               (q) "Notice of Grant" means a written or electronic notice
evidencing certain terms and conditions of an individual Option grant. The
Notice of Grant is part of the Option Agreement.

                                      -2-
<PAGE>   3

               (r) "Officer" means a person who is an officer of the Company
within the meaning of Section 16 of the Exchange Act and the rules and
regulations promulgated thereunder.

               (s) "Option" means a stock option granted pursuant to the Plan.

               (t) "Option Agreement" means an agreement between the Company and
an Optionee evidencing the terms and conditions of an individual Option grant.
The Option Agreement is subject to the terms and conditions of the Plan.

               (u) "Optioned Stock" means the Common Stock subject to an Option.

               (v) "Optionee" means the holder of an outstanding Option granted
under the Plan.

               (w) "Outside Director" means a Director who is not an Employee.

               (x) "Parent" means a "parent corporation," whether now or
hereafter existing, as defined in Section 424(e) of the Code.

               (y) "Plan" means this 1998 Stock Plan, as amended.

               (z) "Rule 16b-3" means Rule 16b-3 of the Exchange Act or any
successor to Rule 16b-3, as in effect when discretion is being exercised with
respect to the Plan.

               (aa) "Section 16(b) " means Section 16(b) of the Exchange Act.

               (bb) "Service Provider" means an Employee, Director or
Consultant.

               (cc) "Share" means a share of the Common Stock, as adjusted in
accordance with Section 13 of the Plan.

               (dd) "Subsidiary" means a "subsidiary corporation", whether now
or hereafter existing, as defined in Section 424(f) of the Code.

        3. Stock Subject to the Plan. Subject to the provisions of Section 13 of
the Plan, the maximum aggregate number of Shares that may be optioned and sold
under the Plan is 3,200,000 Shares, plus (a) an increase of 1,500,000 shares to
be added on the day immediately following the date the Common Stock is publicly
traded pursuant to an effective registration statement filed under the Exchange
Act, plus (b) an annual increase to be added on the first day of the Company's
fiscal year, beginning fiscal year 2001, equal to the lesser of (i) 2,000,000
Shares, (ii) 5% of the outstanding Shares of Common Stock on the last day of the
immediately preceding fiscal year or (iii) an amount determined by the Board.
The Shares may be authorized, but unissued, or reacquired Common Stock.

               If an Option expires or becomes unexercisable without having been
exercised in full, the unpurchased Shares which were subject thereto shall
become available for future grant or sale under the Plan (unless the Plan has
terminated); provided, however, that Shares that have actually been issued under
the Plan upon exercise of an Option shall not

                                      -3-
<PAGE>   4

be returned to the Plan and shall not become available for future distribution
under the Plan, except that if unvested Shares are repurchased by the Company at
their original purchase price, such Shares shall become available for future
grant under the Plan.

        4. Administration of the Plan.

               (a) Procedure.

                           (i) Multiple Administrative Bodies. Different
Committees with respect to different groups of Service Providers may administer
the Plan.

                           (ii) Section 162(m). To the extent that the
Administrator determines it to be desirable to qualify Options granted hereunder
as "performance-based compensation" within the meaning of Section 162(m) of the
Code, the Plan shall be administered by a Committee of two or more "outside
directors" within the meaning of Section 162(m) of the Code.

                           (iii) Rule 16b-3. To the extent desirable to qualify
transactions hereunder as exempt under Rule 16b-3, the transactions contemplated
hereunder shall be structured to satisfy the requirements for exemption under
Rule 16b-3.

                           (iv) Other Administration. Other than as provided
above, the Plan shall be administered by (A) the Board or (B) a Committee, which
committee shall be constituted to satisfy Applicable Laws.

               (b) Powers of the Administrator. Subject to the provisions of the
Plan, and in the case of a Committee, subject to the specific duties delegated
by the Board to such Committee, the Administrator shall have the authority, in
its discretion:

                           (i) to determine the Fair Market Value;

                           (ii) to select the Service Providers to whom Options
may be granted hereunder;

                           (iii) to determine the number of shares of Common
Stock to be covered by each Option granted hereunder;

                           (iv) to approve forms of agreement for use under the
Plan;

                           (v) to determine the terms and conditions, not
inconsistent with the terms of the Plan, of any Option granted hereunder. Such
terms and conditions include, but are not limited to, the exercise price, the
time or times when Options may be exercised (which may be based on performance
criteria), any vesting acceleration or waiver of forfeiture restrictions, and
any restriction or limitation regarding any Option or the shares of Common Stock
relating thereto, based in each case on such factors as the Administrator, in
its sole discretion, shall determine;

                           (vi) to construe and interpret the terms of the Plan
and awards granted pursuant to the Plan;

                                      -4-
<PAGE>   5

                           (vii) to prescribe, amend and rescind rules and
regulations relating to the Plan, including rules and regulations relating to
sub-plans established for the purpose of satisfying applicable foreign laws;

                           (viii) to modify or amend each Option (subject to
Section 15(c) of the Plan), including the discretionary authority to extend the
post-termination exercisability period of Options longer than is otherwise
provided for in the Plan;

                           (ix) to allow Optionees to satisfy withholding tax
obligations by electing to have the Company withhold from the Shares to be
issued upon exercise of an Option that number of Shares having a Fair Market
Value equal to the minimum amount required to be withheld. The Fair Market Value
of the Shares to be withheld shall be determined on the date that the amount of
tax to be withheld is to be determined. All elections by an Optionee to have
Shares withheld for this purpose shall be made in such form and under such
conditions as the Administrator may deem necessary or advisable;

                           (x) to authorize any person to execute on behalf of
the Company any instrument required to effect the grant of an Option previously
granted by the Administrator;

                           (xi) to make all other determinations deemed
necessary or advisable for administering the Plan.

               (c) Effect of Administrator's Decision. The Administrator's
decisions, determinations and interpretations shall be final and binding on all
Optionees and any other holders of Options or Shares issued under the Plan.

        5. Eligibility. Nonstatutory Stock Options may be granted to Service
Providers. Incentive Stock Options may be granted only to Employees.

        6. Limitations.

               (a) Each Option shall be designated in the Option Agreement as
either an Incentive Stock Option or a Nonstatutory Stock Option. However,
notwithstanding such designation, to the extent that the aggregate Fair Market
Value of the Shares with respect to which Incentive Stock Options are
exercisable for the first time by the Optionee during any calendar year (under
all plans of the Company and any Parent or Subsidiary) exceeds $100,000, such
Options shall be treated as Nonstatutory Stock Options. For purposes of this
Section 6(a), Incentive Stock Options shall be taken into account in the order
in which they were granted. The Fair Market Value of the Shares shall be
determined as of the time the Option with respect to such Shares is granted.

               (b) Neither the Plan nor any Option shall confer upon an Optionee
any right with respect to continuing the Optionee's relationship as a Service
Provider with the Company, nor shall they interfere in any way with the
Optionee's right or the Company's right to terminate such relationship at any
time, with or without cause.

               (c) The following limitations shall apply to grants of Options:

                                      -5-
<PAGE>   6

                           (i) No Service Provider shall be granted, in any
fiscal year of the Company, Options to purchase more than 1,000,000 Shares.

                           (ii) In connection with his or her initial service, a
Service Provider may be granted Options to purchase up to an additional
1,000,000 Shares, which shall not count against the limit set forth in
subsection (i) above.

                           (iii) The foregoing limitations shall be adjusted
proportionately in connection with any change in the Company's capitalization as
described in Section 13.

        7. Term of Plan. Subject to Section 19 of the Plan, the Plan shall
become effective upon its adoption by the Board. It shall continue in effect for
a term of ten (10) years unless terminated earlier under Section 15 of the Plan.

        8. Term of Option. The term of each Option shall be stated in the Option
Agreement. In the case of an Incentive Stock Option, the term shall be ten (10)
years from the date of grant or such shorter term as may be provided in the
Option Agreement. Moreover, in the case of an Incentive Stock Option granted to
an Optionee who, at the time the Incentive Stock Option is granted, owns stock
representing more than ten percent (10%) of the total combined voting power of
all classes of stock of the Company or any Parent or Subsidiary, the term of the
Incentive Stock Option shall be five (5) years from the date of grant or such
shorter term as may be provided in the Option Agreement.

        9. Option Exercise Price and Consideration.

               (a) Exercise Price. The per share exercise price for the Shares
to be issued pursuant to exercise of an Option shall be determined by the
Administrator, subject to the following:

                           (i) In the case of an Incentive Stock Option

                                   (A) granted to an Employee who, at the time
the Incentive Stock Option is granted, owns stock representing more than ten
percent (10%) of the voting power of all classes of stock of the Company or any
Parent or Subsidiary, the per Share exercise price shall be no less than 110% of
the Fair Market Value per Share on the date of grant.

                                   (B) granted to any Employee other than an
Employee described in paragraph (A) immediately above, the per Share exercise
price shall be no less than 100% of the Fair Market Value per Share on the date
of grant.

                           (ii) In the case of a Nonstatutory Stock Option, the
per Share exercise price shall be determined by the Administrator. In the case
of a Nonstatutory Stock Option intended to qualify as "performance-based
compensation" within the meaning of Section 162(m) of the Code, the per Share
exercise price shall be no less than 100% of the Fair Market Value per Share on
the date of grant.

                                      -6-
<PAGE>   7

                           (iii) Notwithstanding the foregoing, Options may be
granted with a per Share exercise price of less than 100% of the Fair Market
Value per Share on the date of grant pursuant to a merger or other corporate
transaction.

               (b) Waiting Period and Exercise Dates. At the time an Option is
granted, the Administrator shall fix the period within which the Option may be
exercised and shall determine any conditions that must be satisfied before the
Option may be exercised.

               (c) Form of Consideration. The Administrator shall determine the
acceptable form of consideration for exercising an Option, including the method
of payment. In the case of an Incentive Stock Option, the Administrator shall
determine the acceptable form of consideration at the time of grant. Such
consideration may consist entirely of:

                           (i) cash;

                           (ii) check;

                           (iii) promissory note;

                           (iv) other Shares which, in the case of Shares
acquired directly or indirectly from the Company, (A) have been owned by the
Optionee for more than six (6) months on the date of surrender, and (B) have a
Fair Market Value on the date of surrender equal to the aggregate exercise price
of the Shares as to which said Option shall be exercised;

                           (v) consideration received by the Company under a
cashless exercise program implemented by the Company in connection with the
Plan;

                           (vi) a reduction in the amount of any Company
liability to the Optionee, including any liability attributable to the
Optionee's participation in any Company-sponsored deferred compensation program
or arrangement;

                           (vii) any combination of the foregoing methods of
payment; or

                           (viii) such other consideration and method of payment
for the issuance of Shares to the extent permitted by Applicable Laws.

Notwithstanding the foregoing, the Administrator may permit an Option to be
exercised by delivery of a full-recourse promissory note secured by the
purchased shares. All other terms of such promissory note shall be determined by
the Administrator in its sole discretion.

        10. Exercise of Option.

               (a) Procedure for Exercise; Rights as a Stockholder. Any Option
granted hereunder shall be exercisable according to the terms of the Plan and at
such times and under such conditions as determined by the Administrator and set
forth in the Option Agreement. Unless the Administrator provides otherwise,
vesting of Options granted hereunder shall be suspended during any unpaid leave
of absence. An Option may not be exercised for a fraction of a Share.

                                      -7-
<PAGE>   8

                      An Option shall be deemed exercised when the Company
receives: (i) written or electronic notice of exercise (in accordance with the
Option Agreement) from the person entitled to exercise the Option, and (ii) full
payment for the Shares with respect to which the Option is exercised. Full
payment may consist of any consideration and method of payment authorized by the
Administrator and permitted by the Option Agreement and the Plan. Shares issued
upon exercise of an Option shall be issued in the name of the Optionee or, if
requested by the Optionee, in the name of the Optionee and his or her spouse.
Until the Shares are issued (as evidenced by the appropriate entry on the books
of the Company or of a duly authorized transfer agent of the Company), no right
to vote or receive dividends or any other rights as a stockholder shall exist
with respect to the Optioned Stock, notwithstanding the exercise of the Option.
The Company shall issue (or cause to be issued) such Shares promptly after the
Option is exercised. No adjustment will be made for a dividend or other right
for which the record date is prior to the date the Shares are issued, except as
provided in Section 13 of the Plan.

                      Exercising an Option in any manner shall decrease the
number of Shares thereafter available, both for purposes of the Plan and for
sale under the Option, by the number of Shares as to which the Option is
exercised.

               (b) Termination of Relationship as a Service Provider. If an
Optionee ceases to be a Service Provider, other than upon the Optionee's death
or Disability, the Optionee may exercise his or her Option within such period of
time as is specified in the Option Agreement to the extent that the Option is
vested on the date of termination (but in no event later than the expiration of
the term of such Option as set forth in the Option Agreement). In the absence of
a specified time in the Option Agreement, the Option shall remain exercisable
for three (3) months following the Optionee's termination. If, on the date of
termination, the Optionee is not vested as to his or her entire Option, the
Shares covered by the unvested portion of the Option shall revert to the Plan.
If, after termination, the Optionee does not exercise his or her Option within
the time specified by the Administrator, the Option shall terminate, and the
Shares covered by such Option shall revert to the Plan.

               (c) Disability of Optionee. If an Optionee ceases to be a Service
Provider as a result of the Optionee's Disability, the Optionee may exercise his
or her Option within such period of time as is specified in the Option Agreement
to the extent the Option is vested on the date of termination (but in no event
later than the expiration of the term of such Option as set forth in the Option
Agreement). In the absence of a specified time in the Option Agreement, the
Option shall remain exercisable for twelve (12) months following the Optionee's
termination. If, on the date of termination, the Optionee is not vested as to
his or her entire Option, the Shares covered by the unvested portion of the
Option shall revert to the Plan. If, after termination, the Optionee does not
exercise his or her Option within the time specified herein, the Option shall
terminate, and the Shares covered by such Option shall revert to the Plan.

               (d) Death of Optionee. If an Optionee dies while a Service
Provider, the Option may be exercised following Optionee's death within such
period of time as is specified in the Option Agreement to the extent that the
Option is vested on the date of death (but in no event may the option be
exercised later than the expiration of the term of such Option as set forth in
the Option Agreement) by the Optionee's designated beneficiary, provided such
beneficiary has been desig-

                                      -8-
<PAGE>   9
nated prior to Optionee's death in a form acceptable by the Administrator. If
no such beneficiary has been designated by the Optionee, then such Option may be
exercised by the personal representative of the Optionee's estate or by the
person(s) to whom the Option is transferred pursuant to the Optionee's will or
in accordance with the laws of descent and distribution. In the absence of a
specified time in the Option Agreement, the Option shall remain exercisable for
twelve (12) months following Optionee's death. If, at the time of death, the
Optionee is not vested as to his or her entire Option, the Shares covered by the
unvested portion of the Option shall immediately revert to the Plan. If the
Option is not so exercised within the time specified herein, the Option shall
terminate, and the Shares covered by such Option shall revert to the Plan.

        11. Formula Option Grants to Outside Directors. Outside Directors shall
automatically be granted Options in accordance with the following provisions:

               (a) All Options granted pursuant to this Section shall be
Nonstatutory Stock Options and, except as otherwise provided herein, shall be
subject to the other terms and conditions of the Plan.

               (b) Each Outside Director shall be automatically granted an
Option to purchase up to 20,000 Shares on the date of each Annual Stockholder's
Meeting, beginning in fiscal year 2001, provided the individual continues to
serve as an Outside Director through the date of such Annual Stockholder's
Meeting.

               (c) Notwithstanding the provisions of subsections (b) hereof, any
exercise of an Option granted before the Company has obtained stockholder
approval of the Plan in accordance with Section 19 hereof shall be conditioned
upon obtaining such stockholder approval of the Plan in accordance with Section
19 hereof.

               (d) The terms of each Option granted pursuant to this Section
shall be as follows:

                           (i) the term of the Option shall be ten (10) years.

                           (ii) the Option shall be exercisable only while the
Outside Director remains a Director of the Company.

                           (iii) the exercise price per Share shall be 100% of
the Fair Market Value per Share on the date of grant of the Option.

                           (iv) subject to Section 13, the Option shall become
exercisable as to 25% of the Shares subject to the Option on each anniversary of
its date of grant, provided that the Optionee continues to serve as a Director
on such dates.

        12. Limited Transferability of Options. Unless determined otherwise by
the Administrator, an Option may not be sold, pledged, assigned, hypothecated,
transferred, or disposed of in any manner other than by will or by the laws of
descent or distribution and may be exercised, during the lifetime of the
Optionee, only by the Optionee. If the Administrator makes an Option
transferable, such Option shall contain such additional terms and conditions as
the Administrator deems appropriate.

                                      -9-
<PAGE>   10

        13. Adjustments Upon Changes in Capitalization, Dissolution, Merger or
Asset Sale.

               (a) Changes in Capitalization. Subject to any required action by
the stockholders of the Company, the number of shares of Common Stock which have
been authorized for issuance under the Plan but as to which no Options have yet
been granted or which have been returned to the Plan upon cancellation or
expiration of an Option, the number of Shares that may be added to the Plan
pursuant to Section 3, the number of shares granted under Options pursuant to
Section 11(b), and the number of shares of Common Stock covered by each
outstanding Option as well as the price per share of Common Stock covered by
each such outstanding Option, shall be proportionately adjusted for any increase
or decrease in the number of issued shares of Common Stock resulting from a
stock split, reverse stock split, stock dividend, combination or
reclassification of the Common Stock, or any other increase or decrease in the
number of issued shares of Common Stock effected without receipt of
consideration by the Company; provided, however, that conversion of any
convertible securities of the Company shall not be deemed to have been "effected
without receipt of consideration." Such adjustment shall be made by the Board,
whose determination in that respect shall be final, binding and conclusive.
Except as expressly provided herein, no issuance by the Company of shares of
stock of any class, or securities convertible into shares of stock of any class,
shall affect, and no adjustment by reason thereof shall be made with respect to,
the number or price of shares of Common Stock subject to an Option.

               (b) Dissolution or Liquidation. In the event of the proposed
dissolution or liquidation of the Company, the Administrator shall notify each
Optionee as soon as practicable prior to the effective date of such proposed
transaction. The Administrator in its discretion may provide for an Optionee to
have the right to exercise his or her Option until ten (10) days prior to such
transaction as to all of the Optioned Stock covered thereby, including Shares as
to which the Option would not otherwise be exercisable. In addition, the
Administrator may provide that any Company repurchase option applicable to any
Shares purchased upon exercise of an Option shall lapse as to all such Shares,
provided the proposed dissolution or liquidation takes place at the time and in
the manner contemplated. To the extent it has not been previously exercised, an
Option will terminate immediately prior to the consummation of such proposed
action.

               (c) Merger or Asset Sale. In the event of a merger of the Company
with or into another corporation, or the sale of substantially all of the assets
of the Company, each outstanding Option shall be assumed or an equivalent option
substituted by the successor corporation or a Parent or Subsidiary of the
successor corporation. In the event that the successor corporation refuses to
assume or substitute for the Option, the Optionee shall fully vest in and have
the right to exercise the Option as to all of the Optioned Stock, including
Shares as to which it would not otherwise be vested or exercisable. If an Option
becomes fully vested and exercisable in lieu of assumption or substitution in
the event of a merger or sale of assets, the Administrator shall notify the
Optionee in writing or electronically that the Option shall be fully vested and
exercisable for a period of fifteen (15) days from the date of such notice, and
the Option shall terminate upon the expiration of such period. For the purposes
of this paragraph, the Option shall be considered assumed if, following the
merger or sale of assets, the option confers the right to purchase or receive,
for each Share of Optioned Stock subject to the Option immediately prior to the
merger or sale of assets, the consideration (whether stock, cash, or other
securities or property) received in the merger or sale of assets by holders of
Common Stock for each Share held on the effective date of the transaction (and
if holders were

                                      -10-
<PAGE>   11

offered a choice of consideration, the type of consideration chosen by the
holders of a majority of the outstanding Shares); provided, however, that if
such consideration received in the merger or sale of assets is not solely common
stock of the successor corporation or its Parent, the Administrator may, with
the consent of the successor corporation, provide for the consideration to be
received upon the exercise of the Option, for each Share of Optioned Stock
subject to the Option, to be solely common stock of the successor corporation or
its Parent equal in fair market value to the per share consideration received by
holders of Common Stock in the merger or sale of assets.

        14. Date of Grant. The date of grant of an Option shall be, for all
purposes, the date on which the Administrator makes the determination granting
such Option, or such other later date as is determined by the Administrator.
Notice of the determination shall be provided to each Optionee within a
reasonable time after the date of such grant.

        15. Amendment and Termination of the Plan.

               (a) Amendment and Termination. The Board may at any time amend,
alter, suspend or terminate the Plan.

               (b) Stockholder Approval. The Company shall obtain stockholder
approval of any Plan amendment to the extent necessary and desirable to comply
with Applicable Laws.

               (c) Effect of Amendment or Termination. No amendment, alteration,
suspension or termination of the Plan shall impair the rights of any Optionee,
unless mutually agreed otherwise between the Optionee and the Administrator,
which agreement must be in writing and signed by the Optionee and the Company.
Termination of the Plan shall not affect the Administrator's ability to exercise
the powers granted to it hereunder with respect to Options granted under the
Plan prior to the date of such termination.

        16. Conditions Upon Issuance of Shares.

               (a) Legal Compliance. Shares shall not be issued pursuant to the
exercise of an Option unless the exercise of such Option and the issuance and
delivery of such Shares shall comply with Applicable Laws and shall be further
subject to the approval of counsel for the Company with respect to such
compliance.

               (b) Investment Representations. As a condition to the exercise of
an Option, the Company may require the person exercising such Option to
represent and warrant at the time of any such exercise that the Shares are being
purchased only for investment and without any present intention to sell or
distribute such Shares if, in the opinion of counsel for the Company, such a
representation is required.

        17. Inability to Obtain Authority. The inability of the Company to
obtain authority from any regulatory body having jurisdiction, which authority
is deemed by the Company's counsel to be necessary to the lawful issuance and
sale of any Shares hereunder, shall relieve the Company of any liability in
respect of the failure to issue or sell such Shares as to which such requisite
authority shall not have been obtained.

                                      -11-
<PAGE>   12

        18. Reservation of Shares. The Company, during the term of this Plan,
will at all times reserve and keep available such number of Shares as shall be
sufficient to satisfy the requirements of the Plan.

        19. Stockholder Approval. The Plan shall be subject to approval by the
stockholders of the Company within twelve (12) months after the date the Plan is
adopted. Such stockholder approval shall be obtained in the manner and to the
degree required under Applicable Laws.

                                      -12-

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