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                               DEPOTECH CORPORATION                 EXHIBIT 99.1
                       1997 SUPPLEMENTAL STOCK OPTION PLAN


                                   ARTICLE ONE

                                     GENERAL

I.    PURPOSE OF THE PLAN

      A.    This 1997 Supplemental Stock Option Plan is intended to promote the
interests of DepoTech Corporation, a California corporation, by authorizing an
additional reserve of shares of the Corporation's common stock for issuance
through long-term option grants to be made from time to time to individuals in
the employ or service of the Corporation (or any Parent or Subsidiary) who are
neither officers of the Corporation nor members of the Board and who are not
otherwise Section 16 Insiders.

      B.    The Plan shall become effective immediately upon adoption by the
Board on October 14, 1997.

      C.    This Plan shall supplement the authorized share reserve under the
Corporation's 1995 Stock Option/Stock Issuance Plan, and share issuances under
this Plan shall not reduce or otherwise affect the number of shares of the
Corporation's common stock available for issuance under the 1995 Stock
Option/Stock Issuance Plan. In addition, share issuances under the 1995 Stock
Option/Stock Issuance Plan shall not reduce or otherwise affect the number of
shares of the Corporation's common stock available for issuance under this Plan.

      D.    Capitalized terms shall have the meanings assigned to such terms in
the attached Appendix.

II.   ADMINISTRATION OF THE PLAN

      A.    The Plan Administrator shall have full power and discretion (subject
to the express provisions of the Plan) to establish such rules and regulations
as it may deem appropriate for the proper administration of the Plan and to make
such determinations under, and issue such interpretations of, the provisions of
the Plan and any outstanding option grants thereunder as it may deem necessary
or advisable. Decisions of the Plan Administrator shall be final and binding on
all parties who have an interest in the Plan or any outstanding option
thereunder.

      B.    The individuals serving as Plan Administrator shall serve for such
period as the Board may determine and shall be subject to removal by the Board
at any time.

      C.    Service as Plan Administrator shall constitute service as a Board
member, and each Board member serving as Plan Administrator shall accordingly be
entitled to full


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indemnification and reimbursement as a Board member for such service. No
individual serving as Plan Administrator shall be liable for any act or omission
made in good faith with respect to the Plan or any option granted under the
Plan.

III.  ELIGIBILITY

      A.    The persons eligible to participate in the Plan shall be limited to
those Employees and independent consultants and advisors in the service of the
Corporation (or any Parent or Subsidiary) who are neither officers of the
Corporation nor members of the Board and who are not otherwise Section 16
Insiders at the time of the option grant.

      B.    The Plan Administrator shall have full authority to determine which
eligible individuals are to receive option grants under the Plan, the time or
times when such grants are to be made, the number of shares to be covered by
each such grant, the time or times when each granted option is to become
exercisable and the maximum term for which the option may remain outstanding.
All options granted under the Plan shall be Non-Statutory Options.

IV.   STOCK SUBJECT TO THE PLAN

      A.    Shares of Common Stock shall be available for issuance under the
Plan and shall be drawn from either the Corporation's authorized but unissued
shares of Common Stock or from reacquired shares of Common Stock, including
shares repurchased by the Corporation on the open market. The maximum number of
shares of Common Stock reserved for issuance over the term of the Plan shall be
limited to 141,000 shares, subject to adjustment from time to time in accordance
with the provisions of this Section IV of Article One.

      B.    Should one or more outstanding options under this Plan expire or
terminate for any reason prior to exercise in full (including any option
cancelled in accordance with the cancellation-regrant provisions of Section III
of Article Two), then the shares subject to the portion of each option not so
exercised shall be available for subsequent issuance under the Plan. Should the
exercise price of an outstanding option under the Plan be paid with shares of
Common Stock, then the number of shares of Common Stock available for issuance
under the Plan shall be reduced by the gross number of shares for which the
option is exercised, and not by the net number of shares of Common Stock
actually issued to the holder of such option.

      C.    Should any change be made to the Common Stock issuable under the
Plan by reason of any stock split, stock dividend, recapitalization, combination
of shares, exchange of shares or other change affecting the outstanding Common
Stock as a class without the Corporation's receipt of consideration, then
appropriate adjustments shall be made to (i) the maximum number and/or class of
securities issuable under the Plan and (ii) the number and/or class of
securities and price per share in effect under each option outstanding under the
Plan. Such adjustments to the outstanding options are to be effected in a manner
which shall preclude the enlargement or dilution of rights and benefits under
such options. The adjustments determined by the Plan Administrator shall be
final, binding and conclusive.


                                       2.
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                                   ARTICLE TWO

                              OPTION GRANT PROGRAM


I.    OPTION TERMS

      Options granted under the Plan shall be authorized by action of the Plan
Administrator and shall be evidenced by one or more instruments in the form
approved by the Plan Administrator; provided, however, that each such instrument
shall comply with the terms and conditions specified below. All such granted
options shall be Non-Statutory Options.

      A.    Exercise Price.

            1.    The exercise price per share shall be fixed by the Plan
Administrator but shall not be less than one hundred percent (100%) of the Fair
Market Value per share of Common Stock on the grant date.

            2.    Full payment of the exercise price shall become immediately
due upon exercise of the option and shall be payable in one or more of the forms
specified below:

                  a.    cash or check made payable to the Corporation's order,

                  b.    shares of Common Stock held for the requisite period
                        necessary to avoid a charge to the Corporation's
                        earnings for financial reporting purposes and valued at
                        Fair Market Value on the Exercise Date, or

                  c.    through a special sale and remittance procedure pursuant
                        to which the Optionee shall concurrently provide
                        irrevocable instructions to (a) a Corporation-designated
                        brokerage firm to effect the immediate sale of the
                        purchased shares and remit to the Corporation, out of
                        the sale proceeds available on the settlement date,
                        sufficient funds to cover the aggregate exercise price
                        payable for the purchased shares plus all applicable
                        Federal, state and local income and employment taxes
                        required to be withheld by the Corporation in connection
                        with such purchase and (b) the Corporation to deliver
                        the certificates for the purchased shares directly to
                        such brokerage firm in order to complete the sale
                        transaction.


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      Except to the extent such sale and remittance procedure is utilized,
payment of the exercise price for the purchased shares must be made on the
Exercise Date.

      B.    Exercise and Term of Options. Each option shall be exercisable at
such time or times, during such period and for such number of shares as shall be
determined by the Plan Administrator and set forth in the documents evidencing
such option. No option shall have a maximum term in excess of ten (10) years.
During the lifetime of the Optionee, the option shall be exercisable only by the
Optionee and shall not be assignable or transferable except for a transfer of
the option effected by will or by the laws of inheritance following the
Optionee's death.

      C.    Effect of Termination of Service.

            1.    The following provisions shall govern the exercise of any
options held by the Optionee at the time of cessation of Service or death:

                  a.    Any option outstanding at the time of the Optionee's
   cessation of Service for any reason shall remain exercisable for such limited
   period of time thereafter as shall be determined by the Plan Administrator
   and set forth in the documents evidencing the option, but no such option
   shall be exercisable after the expiration of the option term.

                  b.    Any option exercisable in whole or in part by the
   Optionee at the time of death may be subsequently exercised by the personal
   representative of the Optionee's estate or by the person or persons to whom
   the option is transferred pursuant to the Optionee's will or in accordance
   with the laws of descent and distribution.

                  c.    During the applicable post-Service exercise period, the
   option may not be exercised in the aggregate for more than the number of
   shares for which the option is exercisable on the date of the Optionee's
   cessation of Service. Upon the expiration of the applicable post-Service
   exercise period or (if earlier) upon the expiration of the option term, the
   option shall terminate and cease to be outstanding for any otherwise
   exercisable shares for which the option has not been exercised. However, the
   option shall, immediately upon the Optionee's cessation of Service, terminate
   and cease to be outstanding for any and all shares for which the option is
   not otherwise at that time exercisable.

                  d.    Should the Optionee's Service be terminated for
   Misconduct, then all outstanding options held by the Optionee shall terminate
   immediately and cease to be outstanding.


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            2.    The Plan Administrator shall have the discretion, exercisable
either at the time an option is granted or at any time while the option remains
outstanding, to:

                  a.    extend the period of time for which the option is to
   remain exercisable following Optionee's cessation of Service or death from
   the limited period otherwise in effect for that option to such greater period
   of time as the Plan Administrator shall deem appropriate, but in no event
   beyond the expiration of the option term, and/or

                  b.    permit the option to be exercised, during the
   applicable post-Service exercise period, not only with respect to the number
   of shares of Common Stock for which such option is exercisable at the time of
   the Optionee's cessation of Service but also with respect to one or more
   additional installments for which the option would have become exercisable
   had the Optionee continued in Service.

      D.    Shareholder Rights. An Optionee shall have none of the rights of a
shareholder with respect to any option shares until such person shall have
exercised the option and paid the exercise price for the purchased shares.

II.   CORPORATE TRANSACTION/CHANGE IN CONTROL

      A.    In the event of any Corporate Transaction, each option outstanding
at the time but not otherwise fully exercisable shall automatically accelerate
so that each such option shall, immediately prior to the effective date of the
Corporate Transaction, become exercisable for all of the shares of Common Stock
at the time subject to such option and may be exercised for any or all of those
shares as fully-vested shares of Common Stock. However, an outstanding option
shall NOT become exercisable on such an accelerated basis if and to the extent:
(i) such option is, in connection with the Corporate Transaction, either to be
assumed by the successor corporation (or parent thereof) or (ii) such option is
to be replaced with a cash incentive program of the successor corporation which
preserves the spread existing at the time of the Corporate Transaction on the
shares for which the option is not otherwise at that time exercisable (the
excess of the Fair Market Value of those shares over the exercise price payable
for such shares) and provides for subsequent payout in accordance with the same
exercise/vesting schedule applicable to those option shares or (iii) the
acceleration of such option is subject to other limitations imposed by the Plan
Administrator at the time of the option grant.

      B.    Immediately following the consummation of the Corporate Transaction,
all outstanding options shall terminate and cease to be outstanding, except to
the extent assumed by the successor corporation (or parent thereof).

      C.    Each option which is assumed in connection with a Corporate
Transaction shall be appropriately adjusted, immediately after such Corporate
Transaction, to apply to the number and class of securities which would have
been issuable to the Optionee in consummation


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of such Corporate Transaction had the option been exercised immediately prior to
such Corporate Transaction. Appropriate adjustments to reflect such Corporate
Transaction shall also be made to (i) the number and/or class of securities
available for issuance under the Plan following the consummation of such
Corporate Transaction and (ii) the exercise price payable per share under each
outstanding option, provided the aggregate exercise price payable for such
securities shall remain the same.

      D.    The Plan Administrator shall have full power and authority to grant
options under the Plan which will automatically accelerate in the event the
Optionee's Service subsequently terminates by reason of an Involuntary
Termination within a designated period (not to exceed eighteen (18) months)
following the effective date of any Corporate Transaction in which those options
are assumed and do not otherwise accelerate. Any options so accelerated shall
remain exercisable for fully-vested shares until the earlier of (i) the
expiration of the option term or (ii) the expiration of the one (1)-year period
measured from the effective date of the Involuntary Termination.

      E.    The Plan Administrator shall have the discretion, exercisable either
at the time the option is granted or at any time while the option remains
outstanding, to provide for the automatic acceleration of one or more
outstanding options in connection with a Change in Control so that each such
option shall, immediately prior to the effective date of the Change in Control,
become exercisable for all of the shares of Common Stock at the time subject to
such option and may be exercised for any or all of those shares as fully-vested
shares of Common Stock. The accelerated option shall remain exercisable for
fully-vested shares until the expiration or sooner termination of the option
term. Alternatively, the Plan Administrator may condition such option
acceleration upon the termination of the Optionee's Service by reason of an
Involuntary Termination within a designated period (not to exceed eighteen (18)
months) following the effective date of the Change in Control. Each option so
accelerated shall remain exercisable for fully-vested shares until the earlier
of (i) the expiration of the option term or (ii) the expiration of the one
(1)-year period measured from the effective date of the Involuntary Termination.

      F.    The grant of options under the Plan shall in no way affect the right
of the Corporation to adjust, reclassify, reorganize or otherwise change its
capital or business structure or to merge, consolidate, dissolve, liquidate or
sell or transfer all or any part of its business or assets.

III.  CANCELLATION AND REGRANT OF OPTIONS

      The Plan Administrator shall have the authority to effect, at any time and
from time to time, with the consent of the affected Optionees, the cancellation
of any or all outstanding options under the Plan and to grant in substitution
new options under the Plan covering the same or different numbers of shares of
Common Stock but with an exercise price per share not less than the Fair Market
Value of the Common Stock on the new grant date.


                                  ARTICLE THREE


                                       6.
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                                  MISCELLANEOUS

I.    FINANCING

      A.    The Plan Administrator may permit any Optionee to pay the option
exercise price under the Plan by delivering a promissory note payable in one or
more installments. The terms of any such promissory note (including the interest
rate and the terms of repayment) shall be established by the Plan Administrator
in its sole discretion. Promissory notes may be authorized with or without
security or collateral. In all events, the maximum credit available to the
Optionee may not exceed the sum of (i) the aggregate option exercise price
payable for the purchased shares plus (ii) any Federal, state and local income
and employment tax liability incurred by the Optionee in connection with the
option exercise.

      B.    The Plan Administrator may, in its discretion, determine that one or
more such promissory notes shall be subject to forgiveness by the Corporation in
whole or in part upon such terms as the Plan Administrator may deem appropriate.

II.   AMENDMENT OF THE PLAN

      The Board has complete and exclusive power and authority to amend or
modify the Plan in any or all respects whatsoever. However, no such amendment or
modification shall adversely affect rights and obligations with respect to stock
options at the time outstanding under the Plan, unless the affected Optionees
consent to such amendment.

III.  TAX WITHHOLDING

      The Corporation's obligation to deliver shares of Common Stock upon the
exercise of stock options under the Plan shall be subject to the satisfaction of
all applicable Federal, state and local income tax and employment tax
withholding requirements.

IV.   EFFECTIVE DATE AND TERM OF PLAN

      A.    This Plan shall become effective immediately upon approval by the
Board at the October 14, 1997 Board meeting and shall not be subject to
shareholder approval.

      B.    The Plan shall terminate upon the earliest of (i) October 13, 2007,
(ii) the date on which all shares available for issuance under the Plan shall
have been issued pursuant to the exercise of options under the Plan or (iii) the
termination of all outstanding options in connection with a Corporate
Transaction. If the date of termination is determined under clause (i) above,
then all option grants outstanding on such date shall thereafter continue to
have force and effect in accordance with the provisions of the instruments
evidencing those grants.

V.    USE OF PROCEEDS


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      Any cash proceeds received by the Corporation from the sale of shares
pursuant to option grants under the Plan shall be used for general corporate
purposes.

VI.   REGULATORY APPROVALS

      A.    The implementation of the Plan, the granting of any option under the
Plan, and the issuance of Common Stock upon the exercise of the stock options
granted hereunder shall be subject to the Corporation's procurement of all
approvals and permits required by regulatory authorities having jurisdiction
over the Plan, the stock options granted under it and the Common Stock issued
pursuant to it.

      B.    No shares of Common Stock or other assets shall be issued or
delivered under this Plan unless and until there shall have been compliance with
all applicable requirements of Federal and state securities laws, including the
filing and effectiveness of the Form S-8 registration statement for the shares
of Common Stock issuable under the Plan, and all applicable listing requirements
of any securities exchange on which the Common Stock is then listed for trading.

VII.  NO EMPLOYMENT/SERVICE RIGHTS

      Nothing in the Plan shall confer upon the Optionee any right to continue
in Service for any period of specific duration or interfere with or otherwise
restrict in any way the rights of the Corporation (or any Parent or Subsidiary
employing or retaining such person) or of the Optionee, which rights are hereby
expressly reserved by each, to terminate such person's Service at any time for
any reason, with or without cause.


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                                    APPENDIX


            The following definitions shall be in effect under the Plan:

      A.    BOARD shall mean the Corporation's Board of Directors.

      B.    CHANGE IN CONTROL shall mean a change in ownership or control of the
Corporation effected through either of the following transactions:

            -     the acquisition, directly or indirectly, by any person or
      related group of persons (other than the Corporation or a person that
      directly or indirectly controls, is controlled by, or is under common
      control with, the Corporation), of beneficial ownership (within the
      meaning of Rule 13d-3 of the Securities Exchange Act of 1934, as amended)
      of securities possessing more than fifty percent (50%) of the total
      combined voting power of the Corporation's outstanding securities pursuant
      to a tender or exchange offer made directly to the Corporation's
      shareholders which the Board does not recommend such shareholders to
      accept, or

            -     a change in the composition of the Board over a period of
      twenty four (24) consecutive months or less such that a majority of the
      Board members ceases, by reason of one or more contested elections for
      Board membership, to be comprised of individuals who either (A) have been
      Board members continuously since the beginning of such period or (B) have
      been elected or nominated for election as Board members during such period
      by at least a majority of the Board members described in clause (A) who
      were still in office at the time the Board approved such election or
      nomination.

      C.    CODE shall mean the Internal Revenue Code of 1986, as amended.

      D.    COMMON STOCK shall mean the Corporation's common stock.

      E.    CORPORATE TRANSACTION shall mean either of the following
shareholder-approved transactions to which the Corporation is a party:

            -     a merger or consolidation in which securities possessing more
      than fifty percent (50%) of the total combined voting power of the
      Corporation's outstanding securities are transferred to a person or
      persons different from the persons holding those securities immediately
      prior to such transaction; or

            -     the sale, transfer or other disposition of all or
      substantially all of the Corporation's assets in complete liquidation or
      dissolution of the Corporation.


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      F.    CORPORATION shall mean DepoTech Corporation, a California
corporation, and any corporate successor to all or substantially all of the
assets or voting stock of DepoTech Corporation which shall by appropriate action
adopt the Plan.

      H.    EMPLOYEE shall mean an individual who is in the employ of the
Corporation (or any Parent or Subsidiary), subject to the control and direction
of the employer entity as to both the work to be performed and the manner and
method of performance.

      I.    EXERCISE DATE shall mean the date on which the Corporation shall
have received written notice of the option exercise.

      J.    FAIR MARKET VALUE per share of Common Stock on any relevant date
shall be determined in accordance with the following provisions:

            -     If the Common Stock is at the time traded on the Nasdaq
      National Market, then the Fair Market Value shall be the closing selling
      price per share of Common Stock on the date in question, as such price is
      reported by the National Association of Securities Dealers on the Nasdaq
      National Market. If there is no closing selling price for the Common Stock
      on the date in question, then the Fair Market Value shall be the closing
      selling price on the last preceding date for which such quotation exists.

            -     If the Common Stock is at the time listed on any Stock
      Exchange, then the Fair Market Value shall be the closing selling price
      per share of Common Stock on the date in question on the Stock Exchange
      determined by the Plan Administrator to be the primary market for the
      Common Stock, as such price is officially quoted in the composite tape of
      transactions on such exchange. If there is no closing selling price for
      the Common Stock on the date in question, then the Fair Market Value shall
      be the closing selling price on the last preceding date for which such
      quotation exists.

      K.    INVOLUNTARY TERMINATION shall mean the termination of the Service of
any individual which occurs by reason of:

            -     such individual's involuntary dismissal or discharge by the
      Corporation for reasons other than Misconduct, or

            -     such individual's voluntary resignation following (A) a change
      in his or her position with the Corporation which materially reduces his
      or her duties and responsibilities or the level of management to which he
      or she reports, (B) a reduction in his or her level of compensation
      (including base salary, fringe benefits


                                      A-2.
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      and target bonus under any corporate-performance based bonus or incentive
      programs) by more than fifteen percent (15%) or (C) a relocation of such
      individual's place of employment by more than fifty (50) miles, provided
      and only if such change, reduction or relocation is effected by the
      Corporation without the individual's consent.

      L.    MISCONDUCT shall mean the commission of any act of fraud,
embezzlement or dishonesty by the Optionee, any unauthorized use or disclosure
by the Optionee of confidential information or trade secrets of the Corporation
(or any Parent or Subsidiary), or any other intentional misconduct by the
Optionee adversely affecting the business or affairs of the Corporation (or any
Parent or Subsidiary) in a material manner. The foregoing definition shall not
be deemed to be inclusive of all the acts or omissions which the Corporation (or
any Parent or Subsidiary) may consider as grounds for the dismissal or discharge
of any Optionee or other person in the Service of the Corporation (or any Parent
or Subsidiary).

      M.    NON-STATUTORY OPTION shall mean an option not intended to satisfy
the requirements of Code Section 422.

      N.    OPTIONEE shall mean any person to whom an option is granted under
the Plan.

      O.    PARENT shall mean any corporation (other than the Corporation) in an
unbroken chain of corporations ending with the Corporation, provided each
corporation in the unbroken chain (other than the Corporation) owns, at the time
of the determination, stock possessing fifty percent (50%) or more of the total
combined voting power of all classes of stock in one of the other corporations
in such chain.

      P.    PERMANENT DISABILITY OR PERMANENTLY DISABLED shall mean the
inability of the Optionee to engage in any substantial gainful activity by
reason of any medically determinable physical or mental impairment expected to
result in death or to be of continuous duration of twelve (12) months or more.

      Q.    PLAN shall mean the Corporation's 1997 Supplemental Stock Option
Plan, as set forth in this document.

      R.    PLAN ADMINISTRATOR shall mean either the Board or a committee of the
Board acting in its administrative capacity under the Plan.

      S.    PLAN EFFECTIVE DATE shall mean October 14, 1997, the date on which
the Plan was adopted by the Board.

      U.    SECTION 16 INSIDER shall mean an officer or director of the
Corporation subject to the short-swing profit restrictions of Section 16 of the
Securities Exchange Act of 1934, as amended.


                                      A-3.
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      V.    SERVICE shall mean the performance of services to the Corporation
(or any Parent or Subsidiary) by any person in the capacity of an Employee or an
independent consultant or advisor, except to the extent otherwise specifically
provided in the applicable stock option agreement.

      W.    STOCK EXCHANGE shall mean either the American Stock Exchange or the
New York Stock Exchange.

      X.    SUBSIDIARY shall mean any corporation (other than the Corporation)
in an unbroken chain of corporations beginning with the Corporation, provided
each corporation (other than the last corporation) in the unbroken chain owns,
at the time of the determination, stock possessing fifty percent (50%) or more
of the total combined voting power of all classes of stock in one of the other
corporations in such chain.


                                      A-4.