LIDAK PHARMACEUTICALS
SC 13D, 1998-01-22
PHARMACEUTICAL PREPARATIONS
Previous: MAXXIM MEDICAL INC, 10-K, 1998-01-22
Next: LIDAK PHARMACEUTICALS, SC 13D, 1998-01-22



                                                                     




                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934


                              LIDAK Pharmaceuticals

                                (Name of Issuer)

                  Class A Common Stock and Class B Common Stock

                         (Title of Class of Securities)

                                    531707107
                  ---------------------------------------------
                                 (CUSIP Number)

                                   -----------
                              LIDAK Pharmaceuticals
                           11077 N. Torrey Pines Road
                           La Jolla, California 92037
                                 (619) 558-0364

   (Name, Address and Telephone Number of Person Authorized to Receive Notices
                              and Communications)

                                January 12, 1998
        -----------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)


If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box. __

Check the  following box if a fee is being paid with the statement __. (A fee is
not required only if the reporting person:  (1) has a previous statement on file
reporting  beneficial  ownership  of more  than  five  percent  of the  class of
securities  described  in Item 1;  and (2) has  filed  no  amendment  subsequent
thereto reporting  beneficial  ownership of five percent or less of such class.)
(See Rule 13d-7.)

Note: Six copies of this statement, including all exhibits, should be filed with
the  Commission.  See Rule  13d-1(a) for other  parties to whom copies are to be
sent.

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent   amendment   containing   information  which  would  alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).


<PAGE>




                                  SCHEDULE 13D



CUSIP No. 531707107                                                 
- -------------------------------------------- 


   1      NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          David H. Katz, M.D.
          SS# ###-##-####

   2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*            (a) __
                                                                       (b)  x
          

   3      SEC USE ONLY


   4      SOURCE OF FUNDS*

          00   HealthMed,  Inc. is obligated to pay $1,528,234.98 to Dr. Katz as
               evidenced by the promissory note which was given as consideration
               for the shares sold by Dr. Katz and obligated to pay  $263,004.00
               to  Medical  Biology   Institute  ("MBI")  as  evidenced  by  the
               promissory note which was given as  consideration  for the shares
               sold by MBI.

   5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO 
          ITEMS 2(d) or 2(e)                                       __

          Not applicable.

   6      CITIZENSHIP OR PLACE OF ORGANIZATION

          California

                                  7      SOLE VOTING POWER
                                         -0-
          NUMBER OF
           SHARES
        BENEFICIALLY              8      SHARED VOTING POWER 
          OWNED BY                       -0-
            EACH
          REPORTING               9      SOLE DISPOSITIVE POWER
           PERSON                        Class A Common Stock: 3,339,193
            WITH                         Class B Common Stock:   375,000

                                 10      SHARED DISPOSITIVE POWER
                                         -0-

   11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
          Class A Common Stock:  3,339,193
          Class B Common Stock:    375,000

   12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN 
          SHARES*                                                           __

   13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
          Class A Common Stock:  7.9%
          Class B Common Stock:  57%

   14     TYPE OF REPORTING PERSON*
          IN


                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



<PAGE>



                                  SCHEDULE 13D
                                       FOR
                               DAVID H. KATZ, M.D.


Item 1.  Security and Issuer.

         Securities: Class A common stock, no par value ("Class A Common Stock")
                     Class B common stock, no par value ("Class B Common Stock")

         Issuer:           LIDAK Pharmaceuticals ("LIDAK")
                           11077 N. Torrey Pines Road
                           La Jolla, California 92037

Item 2.  Identity and Background.  This Schedule 13D is filed on behalf of 
                                   David H. Katz, M.D.

         a. Name: David H. Katz, M.D.

         b. Business Address: c/o LIDAK  Pharmaceuticals,  11077 N. Torrey Pines
Road, La Jolla, California 92037.

         c. Dr. Katz is President/Chief Executive Officer of LIDAK.

         d. During the last five years,  Dr.  Katz has not been  convicted  in a
criminal proceeding (excluding traffic violations or similar misdemeanors).

         e. During the last five years, Dr. Katz has not been a party to a civil
proceeding of a judicial or  administrative  body which  resulted in a judgment,
decree  or final  order  enjoining  future  violations  of,  or  prohibiting  or
mandating activities subject to, federal or state securities laws or finding any
violation with respect to such laws.

         f. Citizenship: Dr. Katz is a citizen of the United States.

Item 3.  Source and Amount of Funds or Other Consideration.

         On January 12, 1998, Dr. Katz sold to HealthMed 308,100 shares of Class
A Common Stock and 70,200  shares of Class B Common  Stock for a total  purchase
price of  $1,528,234.98  pursuant to the terms of the Stock  Purchase  Agreement
(the "Katz Stock Purchase  Agreement") dated January 12, 1998 by and between Dr.
Katz and HealthMed, Inc., a Nevada corporation ("HealthMed"). The purchase price
was paid by HealthMed in the form of a  Promissory  Note dated  January 12, 1998
(the "Katz  Promissory  Note") in the  principal  amount of  $1,528,234.98.  The
maturity date of the Katz Promissory Note is January 12, 2000.

         On January 12, 1998, Medical Biology Institute,  a California nonprofit
public benefit corporation  ("MBI"),  sold to HealthMed 65,100 shares of Class A
Common Stock for a total purchase price of $263,004.00  pursuant to the terms of
the Stock Purchase Agreement ("MBI Stock Purchase  Agreement") dated January 12,
1998 by and between MBI and HealthMed.  The purchase price was paid by HealthMed
in the form of a Promissory Note (the "MBI  Promissory  Note") dated January 12,
1998 in the  principal  amount  of  $263,004.00.  The  maturity  date of the MBI
Promissory Note is January 12, 2000. Dr. Katz is the President,  Chief Executive
Officer and a director of MBI and may be deemed to beneficially  own any and all
shares of LIDAK over which MBI has the power to vote or dispose.

Item 4.  Purpose of Transaction.

         Dr. Katz and MBI completed the transactions  described herein to create
liquidity  and to  induce  HealthMed  to make a large  investment  in  LIDAK  by
granting  HealthMed  the full and  exclusive  power to vote the  shares  sold to
HealthMed and placed in the voting trust, to elect the LIDAK Board of Directors,
and to manage LIDAK.


<PAGE>



         a. Not applicable.

         b. Not applicable.

         c. Not applicable.

         d.  Pursuant  to  the  terms  of a  non-binding  letter  proposal  (the
"Proposal")  dated  January  13,  1998 from  Mitchell  J.  Stein,  President  of
HealthMed, to Dr. Katz, Chief Executive Officer of LIDAK, HealthMed has proposed
to invest up to $130 million  into LIDAK.  The  performance  of the terms of the
Proposal is subject to certain contingencies,  including,  but not limited to, a
change in the composition of the present board of directors of LIDAK.

         e. The  performance  of the  terms of the  Proposal  would  result in a
non-dilutive investment in LIDAK by HealthMed.

         f. Not applicable.

         g. Not applicable.

         h. Not applicable.

         i. Not applicable.

         j. Not applicable.

Item 5.  Interest in Securities of the Issuer.

         a. Dr.  Katz is the  beneficial  owner of  3,339,193  shares of Class A
Common Stock and 375,000 shares of Class B Common Stock.  Dr. Katz may therefore
by deemed to beneficially  own 7.9% of the Class A Common Stock  outstanding and
57% of the  Class B  Common  Stock  outstanding.  Pursuant  to the  Articles  of
Incorporation  of LIDAK,  each share of Class A Common Stock entitles the holder
to one vote and each share of Class B Common  Stock  entitles the holder to five
votes upon any and all  matters  submitted  to the  shareholders  of LIDAK for a
vote.

     The  calculation of the percentage of shares  beneficially  owned as of the
date hereof is based on LIDAK's  From 10-K for the Fiscal  Year Ended  September
30, 1997 in which LIDAK reported there were 38,742,511  shares of Class A Common
Stock  outstanding and 283,000 shares of Class B Common Stock  outstanding as of
December 29, 1997. The calculation  gives effect to the automatic  conversion of
163,800  shares of Class B Common Stock  transferred by Dr. Katz into the voting
trust  (see Item 5b.  below)  into  163,800  shares  of Class A Common  Stock as
required by the Articles of  Incorporation  of LIDAK. The calculation also gives
effect to (i) Dr.  Katz's  exercise of his stock options (the  "Options")  which
grant to him the right to purchase  1,918,400 shares of Class A Common Stock and
375,000 shares of Class B Common Stock and (ii) Dr. Katz's exercise of his Class
D Warrants to purchase 386,190 shares of Class A Common Stock.

         b. On January 12, 1998, Dr. Katz transferred  718,903 shares of Class A
Common  Stock and  163,800  shares of Class B Common  Stock into a voting  trust
controlled by HealthMed pursuant to the terms of the Voting Trust Agreement (the
"Katz Voting Trust  Agreement")  dated  January 12, 1998 by and between Dr. Katz
and HealthMed.  Upon this  transfer,  the 163,800 shares of Class B Common Stock
automatically  converted to 163,800 shares of Class A Common Stock. HealthMed is
the sole  trustee of the voting  trust and has the sole power to vote the shares
of Class A Common  Stock and Class B Common  Stock.  The term of the Katz Voting
Trust  Agreement  is ten (10) years.  During the term of the Katz  Voting  Trust
Agreement,  Dr. Katz must place in trust all shares of Class A Common  Stock and
Class B Common  Stock  purchased  or received by him from any source.  Under the
terms of the Katz  Voting  Trust  Agreement,  Dr. Katz may dispose of all of the
Class A Common Stock and Class B Common Stock held in trust; provided,  however,
Dr. Katz may not dispose of more than twenty percent (20%) of the shares held in
trust  within any thirty (30) day period.  Dr. Katz is the  beneficial  owner of
these 882,703 shares of Class A Common Stock.

         As part of the same transaction,  Dr. Katz and HealthMed entered into a
Purchase Rights Agreement (the "Katz Purchase Rights  Agreement")  dated January
12, 1998 pursuant to which Dr. Katz granted  HealthMed the irrevocable  right to
receive either (i) 31.5% of the shares received by Dr. Katz upon the exercise of
the Options or (ii) 31.5% of the net


<PAGE>



proceeds from the sale of such shares upon the exercise of the Options. The term
of the Katz Purchase Rights Agreement  expires on June 21, 2007. The Options are
exercisable  within 60 days.  The  1,918,400  shares of Class A Common Stock and
375,000  shares of Class B Common  Stock  underlying  the Options are  therefore
beneficially owned by Dr. Katz.

         On January 12, 1998, MBI  transferred  151,900 shares of Class A Common
Stock into a voting trust  controlled by HealthMed  pursuant to the terms of the
Voting Trust Agreement (the "MBI Voting Trust Agreement") dated January 12, 1998
by and between MBI and  HealthMed.  HealthMed  is the sole trustee of the voting
trust  and has the sole  power to vote the  shares  of Class A Common  Stock and
Class B Common  Stock.  The term of the MBI Voting  Trust  Agreement is ten (10)
years.  During the term of the MBI  Voting  Trust  Agreement,  MBI must place in
trust all shares of Class A Common Stock and Class B Common  Stock  purchased or
received  by it from  any  source.  Under  the  terms  of the MBI  Voting  Trust
Agreement, MBI may dispose of all of the Class A Common Stock and Class B Common
Stock held in trust; provided,  however, MBI may not dispose of more than twenty
percent (20%) of the shares held in trust within any thirty (30) day period. Dr.
Katz is deemed to beneficially own these 151,900 shares of Class A Common Stock.

         c. Within the last sixty days,  Dr. Katz has effected the  transactions
described in the Katz Stock Purchase Agreement, the Katz Voting Trust Agreement,
the Katz  Purchase  Rights  Agreement and the Katz  Promissory  Note and MBI has
effected the transactions described in the MBI Stock Purchase Agreement, the MBI
Voting Trust  Agreement and the MBI Promissory  Note. A detailed  description of
these  transactions is set forth in this Schedule 13D (and the exhibits  hereto)
and includes the following:

         (1)      Dr. Katz and MBI effected the transactions.
         (2)      The date of the transactions was January 12, 1998.
         (3)      The  transactions  for Dr. Katz  involved a total of 1,027,003
                  shares  of Class A Common  Stock;  234,000  shares  of Class B
                  Common Stock;  1,918,400 options to purchase shares of Class A
                  Common Stock;  and 375,000 options to purchase shares of Class
                  B Common Stock.  The  transactions for MBI involved a total of
                  217,000 shares of Class A Common Stock.
         (4)      The 308,100  shares of Class A Common Stock and 70,200  shares
                  of Class B Common Stock were  purchased by HealthMed  from Dr.
                  Katz for $4.04 per share.  The 65,100 shares of Class A Common
                  Stock  were  purchased  by  HealthMed  from MBI for  $4.04 per
                  share.
         (5)      The  transactions  were effected in San Diego,  California and
                  were effected pursuant to the terms of the Katz Stock Purchase
                  Agreement,  the Katz Voting Trust Agreement, the Katz Purchase
                  Rights  Agreement,  the Katz  Promissory  Note,  the MBI Stock
                  Purchase Agreement, the MBI Voting Trust Agreement and the MBI
                  Promissory Note.

         d. Not applicable.

         e. Not applicable.

Item 6.  Contracts, Arrangements, Understandings or Relationship with Respect 
         to Securities of the Issuer.

         The discussion herein regarding the (i) Katz Stock Purchase  Agreement,
(ii) Katz Purchase Rights  Agreement,  (iii) Katz Voting Trust  Agreement,  (iv)
Katz Promissory  Note, (v) MBI Stock Purchase  Agreement,  (vi) MBI Voting Trust
Agreement; (vii) MBI Promissory Note is hereby incorporated into this Item 6.

Item 7.  Material to be Filed as Exhibits.  The following are attached hereto
         as exhibits:

         Exhibit 4.1:         Katz Stock Purchase Agreement
         Exhibit 4.2:         Katz Purchase Rights Agreement
         Exhibit 9.1:         Katz Voting Trust Agreement
         Exhibit 10.1:        Katz Promissory Note


<PAGE>


         Exhibit 4.3:         MBI Stock Purchase Agreement
         Exhibit 9.2:         MBI Voting Trust Agreement
         Exhibit 10.2:        MBI Promissory Note
         Exhibit 99.1:        Proposal

Signature

         After reasonable  inquiry and to the best of my knowledge and belief, I
certify that the information  set forth in this statement is true,  complete and
correct.


Date:    January 16, 1998


                                            /s/ David H. Katz
                                            -----------------------------------
                                            David H. Katz, M.D.






                            STOCK PURCHASE AGREEMENT


         This STOCK PURCHASE  AGREEMENT  ("Agreement") is entered into this 12th
day of January,  1998,  by and between  HealthMed,  Inc.,  a Nevada  corporation
("Purchaser") and David Katz, M.D. ("Seller").

                                    RECITALS

         A. LIDAK Pharmaceuticals,  a California corporation (the "Corporation")
presently has  outstanding two classes of common stock  (individually,  "Class A
Shares" and "Class B Shares" and collectively, the "Shares"), of which 1,027,003
Class A Shares and 234,000 of Class B Shares have been issued to Seller.

         B. The Shares are collectively the only issued and outstanding  capital
stock of the Corporation held by Seller.

         C. The  parties  hereto are  parties to that  certain  Purchase  Rights
Agreement  dated of even date herewith,  which  agreement is appended  hereto as
Exhibit A and incorporated herein by this reference.

         D. The Purchaser  desires to purchase from Seller and Seller desires to
sell to the  Purchaser  308,100  of the Class A Shares and 70,200 of the Class B
Shares  owned by Seller on the terms and  subject  to the  conditions  set forth
herein.

                                    AGREEMENT

         NOW, THEREFORE, IT IS AGREED AS FOLLOWS:

         1.       Purchase of Shares.

                  1.1  Purchase of Shares.  Subject to the terms and  conditions
set forth herein,  at the Closing (as defined below) Seller will sell 308,100 of
the  Class A Shares  and  70,200  of the  Class B Shares  owned by Seller to the
Purchaser  and the  Purchaser  will  purchase all of such Shares owned by Seller
from Seller,  such Shares constituting thirty percent (30%) of all of the issued
and  outstanding  capital  stock of the  Corporation  owned by  Seller as of the
Closing.

                  1.2 Purchase  Price.  The Purchase  Price shall be One Million
Five Hundred  Twenty Eight  Thousand Two Hundred  Thirty Four and 98/100 Dollars
($1,528,234.98)  for the  Shares  purchased  hereby  (referred  herein to as the
"Purchase Price").

                  1.3 Payment of Purchase Price. The Purchase Price will be paid
to  Seller  by  Purchaser's  delivery  to  Seller  of a  promissory  note in the
principal sum of the Purchase Price and in substantially the form of Exhibit 1.3
hereto at the Closing (the "Note"), such Note to be at the


                                        1

<PAGE>



rate of ten percent (10%) per annum  computed on the basis of a year of 360 days
for the actual number of days elapsed and shall additionally  provide for annual
payments of interest  only with  principal  due and payable on the second  (2nd)
anniversary  of such Note,  and the Note shall not be subject to any  prepayment
penalties; provided, however, that in the event the last stock purchase price on
the first (1st)  anniversary  date of this  Agreement of the  Company's  Class A
common  stock on the public  market  equals or exceeds  Nine and No/100  Dollars
($9.00),  then Seven Hundred  Seventy One Thousand  Eight Hundred Thirty Two and
98/100 ($771,832.98) of the amount due on the Note shall be accelerated from the
maturity  date  thereof and shall be due and payable no later than  fifteen (15)
days thereafter.

         2.  Representations  and Warranties of Seller. As a material inducement
to the  Purchaser to enter into this  Agreement  and  purchase  the Shares,  the
Seller represents and warrants that:

                  2.1 Ownership of the Shares. Seller is the owner, beneficially
and of record, of the Shares being  transferred  pursuant to this Agreement free
and clear of all  liens,  charges,  claims,  encumbrances,  security  interests,
equities,  restrictions  on  transfer  or other  defects in title of any kind or
description.

                  2.2 Authority to Enter into Agreements; Enforceability. Seller
has the right,  power and authority to enter into and to carry out the terms and
provisions of this Agreement,  including the transfer and delivery of the Shares
being transferred pursuant to this Agreement,  without obtaining the approval or
consent of any other party or authority,  and this  Agreement is a legal,  valid
and binding agreement of Seller, enforceable in accordance with its terms.

                  2.3  No  Conflict.  The  execution  and  performance  of  this
Agreement by Seller will not violate any agreement,  promissory  note,  security
arrangement,  order or other  instrument  to which Seller is a party or by which
Seller may be bound.

                  2.4 Litigation.  To the best knowledge of Seller, there are no
suits,  actions  or  legal,  administrative,  arbitration  or other  proceedings
pending,  filed or initiated by or against the  Corporation  occurring since the
issuance of the Corporation's Form 10K dated September 30, 1997.

                  2.5  Disclosure.   Neither  this  Agreement  nor  any  of  the
schedules,  attachments, written statements,  documents,  certificates, or other
items  prepared or supplied to the  Purchaser by or on behalf of the Seller with
respect to this purchase contain any untrue statement of a material fact or omit
a material fact necessary to make each statement contained herein or therein not
misleading.  The Seller has not intentionally concealed any fact known by him to
have a material  adverse  effect  upon the  Corporation's  existing  or expected
financial condition,  operating results,  assets,  customer relations,  employee
relations, or business prospects taken as a whole.



                                        2

<PAGE>



         3.   Representations  and  Warranties  of  Purchaser.   As  a  material
inducement to the Seller to enter into this  Agreement and sell the Shares,  the
Purchaser hereby represents and warrants to the Seller as follows:

                  3.1  Organization;  Power. The Purchaser is a corporation duly
incorporated and validly existing under the laws of the State of California, and
has all requisite corporate power and authority to enter into this Agreement and
perform its obligations hereunder.

                  3.2 Authorization. The execution, delivery, and performance by
the Purchaser of this Agreement and all other agreements  contemplated hereby to
which the  Purchaser  is a party have been duly and  validly  authorized  by all
necessary  corporate  action of the Purchaser,  and this Agreement and each such
other  agreement,  when  executed  and  delivered by the parties  thereto,  will
constitute the legal, valid, and binding obligation of the Purchaser enforceable
against it in accordance with its terms, except as enforceability may be limited
by applicable bankruptcy,  insolvency, and similar statutes affecting creditors'
rights generally and judicial limits on equitable remedies.

                  3.3 No Conflict  with Other  Instruments  or  Agreements.  The
execution,  delivery, and performance by the Purchaser of this Agreement and all
other agreements  contemplated hereby to which the Purchaser is a party will not
result in a breach or violation of, or constitute a default under,  its Articles
of Incorporation or Bylaws or any material agreement to which the Purchaser is a
party or by which the Purchaser is bound.

                  3.4 Litigation.  There are no actions, suits, proceedings,  or
governmental  investigations  or inquiries  pending or, to the  knowledge of the
Purchaser,   threatened  against  the  Purchaser  or  its  properties,   assets,
operations,  or businesses that might delay, prevent, or hinder the consummation
of this purchase.

                  3.5      Investment Representations.

                          3.5.1 The  Purchaser  is an  "accredited  investor" as
defined by the SEC's Rule 501(a),  and the Purchaser has substantial  experience
in evaluating and investing in private  placement  transactions of securities in
companies  similar  to the  Corporation  so that the  Purchaser  is  capable  of
evaluating the merits and risks of the Purchaser's investment in the Corporation
and has the capacity to protect the Purchaser's own interests.

                          3.5.2  The  Purchaser  is  acquiring  the  Shares  for
investment for the Purchaser's own account,  not as a nominee or agent,  and not
with the view to, or for resale in connection  with, any  distribution  thereof.
The Purchaser  understands  that the Shares to be purchased  have not been,  and
will not be,  registered  under the Securities Act or the securities laws of any
state by reason of a specific exemption from the registration  provisions of the
Securities Act and the applicable  state  securities  laws, the  availability of
which depends upon,  among other things,  the bona fide nature of the investment
intent and the accuracy of the Purchaser's  representations as expressed herein.
The Purchaser is acquiring the Shares without


                                        3

<PAGE>



expectation,   desire,  or  need  for  resale  and  not  with  the  view  toward
distribution, resale, subdivision, or fractionalization of the Shares.

                          3.5.3  During  the course of the  negotiation  of this
Agreement,  the Purchaser has had an  opportunity  to discuss the  Corporation's
business, management and financial affairs with the Corporation's management and
the  opportunity to review the  Corporation's  financial  statements,  books and
records, facilities and business plan. The Purchaser has also had an opportunity
to ask questions of officers of the  Corporation,  which questions were answered
to the Purchaser's satisfaction.

                          3.5.4 The Purchaser  understands that the Shares to be
purchased have not been registered under Securities Act of 1933 ("1933 Act"), or
under any state securities law.

                          3.5.5 The Purchaser understands that the Shares cannot
be resold in a transaction to which the 1933 Act and state securities laws apply
unless  (i)  subsequently  registered  under the 1933 Act and  applicable  state
securities laws or (ii) exemptions from such  registrations  are available.  The
Purchaser is aware of the provisions of Rule 144 promulgated  under the 1933 Act
which permit limited resale of shares purchased in a private transaction subject
to the satisfaction of certain conditions.

                          3.5.6 The Purchaser  understands that no public market
now exists for the Shares and that it is  uncertain  that a public  market  will
ever exist for the Shares.

                          3.5.7 The Purchaser  understands that the certificates
for the Shares will bear the following legend:

          THIS CERTIFICATE HAS NOT BEEN REGISTERED UNDER THE SECURITIES
               ACT OF 1933. THE CORPORATION WILL NOT TRANSFER THIS
            CERTIFICATE UNLESS (i) THERE IS AN EFFECTIVE REGISTRATION
          COVERING THE SHARES REPRESENTED BY THIS CERTIFICATE UNDER THE
           SECURITIES ACT OF 1933 AND ALL APPLICABLE STATE SECURITIES
             LAWS, (ii) IT FIRST RECEIVES A LETTER FROM AN ATTORNEY,
         ACCEPTABLE TO THE BOARD OF DIRECTORS OF THE CORPORATION OR ITS
             AGENTS, STATING THAT IN THE OPINION OF THE ATTORNEY THE
             PROPOSED TRANSFER IS EXEMPT FROM REGISTRATION UNDER THE
              SECURITIES ACT OF 1933 AND UNDER ALL APPLICABLE STATE
           SECURITIES LAWS, OR (iii) THE TRANSFER IS MADE PURSUANT TO
             RULE 144 UNDER THE SECURITIES ACT OF 1933, AS AMENDED.

                    3.6  Tax  Liability.  To  the  extent  the  Purchaser  deems
necessary,  the Purchaser has reviewed with the Purchaser's own tax advisors the
federal, state, local and foreign tax


                                        4

<PAGE>



consequences  of this  investment  and  the  transactions  contemplated  by this
Agreement.  The  Purchaser  relies  solely  on  such  advisors  and  not  on any
statements or  representations of the Seller or any of its agents. The Purchaser
understands that the Purchaser (and not the Seller) shall be responsible for the
Purchaser's  own tax liability that may arise as a result of this  investment or
the transactions contemplated by this Agreement.

                  3.7 Disclosure.  To the Purchaser's knowledge, this Agreement,
with the  Exhibits  hereto,  when taken as a whole,  does not contain any untrue
statement  of a  material  fact  concerning  the  Purchaser  or omit to  state a
material fact necessary in order to make the statements concerning the Purchaser
contained herein not misleading in light of the  circumstances  under which they
were made.

                  3.8 Compliance with Other Instruments. The execution, delivery
and  performance  of and  compliance  with this  Agreement,  and the issuance of
shares  will not result in any  material  violation  of, or  conflict  with,  or
constitute a material default under,  any Purchaser's  articles of incorporation
or  bylaws  or any of the  Purchaser's  material  agreements  nor  result in the
creation of any mortgage, pledge, lien, encumbrance or charge against any of the
assets or properties of the Corporation or the Shares.

         4.  Covenants  of Seller.  The  Seller  covenants  and agrees  with the
Purchaser as follows:

                  4.1 Satisfaction of Conditions. The Seller will use reasonable
efforts to obtain as promptly as practicable the  satisfaction of the conditions
to Closing  described in this  Agreement and any  necessary  consents or waivers
under or amendments to agreements by which the Seller is bound.

                  4.2  Supplements to Schedules.  From time to time prior to the
Closing, the Seller will promptly supplement or amend the Exhibits and Schedules
with respect to any matter  hereafter  arising that, if existing or occurring at
the  date of this  Agreement,  would  have  been  required  to be set  forth  or
described in any Exhibit or Schedule and will  promptly  notify the Purchaser of
any  breach  by  either  of  them  that   either  of  them   discovers   of  any
representation, warranty, or covenant contained in this Agreement. No supplement
or  amendment of any Exhibit or Schedule  made  pursuant to this Section will be
deemed to cure any  breach of any  representation  of or  warranty  made in this
Agreement unless the Purchaser specifically agrees thereto in writing; provided,
however,  that if this purchase is closed,  the Purchaser will be deemed to have
waived its rights with respect to any breach of a representation,  warranty,  or
covenant or any  supplement to any Schedule of which it shall have been notified
pursuant to this Subsection.

                  4.3 No Solicitation. Until the Closing or termination pursuant
to  Section  9 of this  Agreement,  the  Seller  shall not  encourage,  solicit,
initiate,  or  enter  into  any  discussions  or  negotiations   concerning  any
disposition  of any of the capital  stock of Seller (other than pursuant to this
Agreement),  or any  proposal  therefor.  The Seller  will  promptly  inform the
Purchaser of any inquiry (including the terms thereof and the person making such
inquiry) received by the


                                        5

<PAGE>



Seller  after the date  hereof and  believed  by such  person to be a bona fide,
serious inquiry relating to any such proposal.

         5.  Covenant of Purchaser.  The Purchaser  will use its best efforts to
cause the conditions set forth in Section 7 to be satisfied.

         6. Conditions Precedent to the Obligations of Purchaser; Legal Opinion.
Each and every  obligation of the Purchaser  under this  Agreement is subject to
the delivery, at or before the Closing, of an opinion of Luce, Forward, Hamilton
& Scripps LLP, in form and content  reasonably  acceptable  to the Purchaser and
its legal counsel,  to the effect that (i) this Agreement has been duly executed
and  delivered  by  Seller;   (ii)  this  Agreement  and  each  other  agreement
contemplated  hereby,  when executed and delivered by the parties thereto,  will
constitute the legal,  valid, and binding obligation of the Seller,  enforceable
against the Seller in  accordance  with its terms  except as the  enforceability
thereof may be limited by the application of bankruptcy, insolvency, moratorium,
or similar laws affecting the rights of creditors  generally or judicial  limits
on the right of specific  performance;  (iii) except as set forth in Schedule 6,
the  execution  and  delivery  by the  Seller  of this  Agreement  and all other
agreements  contemplated hereby to which the Seller is a party, the offering and
sale of the Shares  hereunder and the  fulfillment  of and  compliance  with the
respective  terms  hereof  and  thereof by the  Seller,  do not and will not (a)
conflict with or result in a breach of the terms,  conditions or provisions  of,
(b) constitute a default under, (c) result in the creation of any lien, security
interest, charge, or encumbrance upon the capital stock or assets of the Seller,
(d) give any third  party the right to  accelerate  any  obligation  under,  (e)
result in a violation of, or (f) require any authorization,  consent,  approval,
exemption,  or other  action  by or notice  to any  court or  administrative  or
governmental body, or any law, statute,  rule, or regulation to which the Seller
is subject, or any agreement,  instrument,  order,  judgment, or decree to which
the Seller is subject;  and (iv) to such  counsel's  knowledge,  Seller owns the
Shares.

         7. Conditions  Precedent to the  Obligations of Seller.  Each and every
obligation of the Seller under this Agreement is subject to the satisfaction, at
or before the Closing, of each of the following conditions:

                  7.1 Representations and Warranties;  Performance.  Each of the
representations  and  warranties  made by the Purchaser  herein will be true and
correct in all  material  respects  as of the  Closing  with the same  effect as
though made at that time except for changes contemplated, permitted, or required
by this  Agreement;  the  Purchaser  will have  performed  and complied with all
agreements, covenants, and conditions required by this Agreement to be performed
and complied with by it prior to the Closing; and the Seller will have received,
at the Closing, a certificate of the Purchaser,  signed by the President and the
Secretary or the Chief Financial Officer of the Purchaser,  stating that each of
the  representations  and  warranties  made by the Purchaser  herein is true and
correct  in  all  material  respects  as  of  the  Closing  except  for  changes
contemplated,  permitted,  or required by this  Agreement and that the Purchaser
has  performed  and complied  with all  agreements,  covenants,  and  conditions
required by this  Agreement to be performed and complied with by it prior to the
Closing.


                                        6

<PAGE>



                  7.2 Corporate Action. The Purchaser will have furnished to the
Seller a copy,  certified  by the  Secretary  of an  Assistant  Secretary of the
Purchaser,  of the  resolutions  of the  Purchaser  authorizing  the  execution,
delivery, and performance of this Agreement.

         8.       Closing.

                  8.1 Time, Place, and Manner of Closing.  Unless this Agreement
has  been  terminated  and this  purchase  has been  abandoned  pursuant  to the
provisions of Section 9, the closing  ("Closing") will be held at the offices of
Stein Perlman & Hawk,  or such other place as the parties may agree,  on January
12,  1998,  or as soon as  practicable  after the  satisfaction  of the  various
conditions precedent to the Closing set forth herein. At the Closing the parties
to this Agreement will exchange  certificates,  Notes, and other instruments and
documents  in order to  determine  whether  the  terms  and  conditions  of this
Agreement have been  satisfied.  Upon the  determination  of each party that its
conditions to consummate this purchase have been satisfied or waived, the Seller
shall deliver to the Purchaser the  certificate(s)  evidencing the Shares,  duly
endorsed for transfer,  and the  Purchaser  shall deliver to the Seller the Note
referred to in Section 1.3, in a manner to be agreed upon by the parties.  After
the Closing,  the Seller,  at the Purchaser's cost, will execute,  deliver,  and
acknowledge  all such further  instruments  of transfer and  conveyance and will
perform  all  such  other  acts  as the  Purchaser  may  reasonably  request  to
effectively transfer the Shares.

                  8.2  Consummation  of  Closing.  All  acts,  deliveries,   and
confirmations  comprising the Closing regardless of chronological sequence shall
be deemed to occur  contemporaneously  and simultaneously upon the occurrence of
the last act,  delivery,  or  confirmation of the Closing and none of such acts,
deliveries, or confirmations shall be effective unless and until the last of the
same  shall  have  occurred.  The  time of the  Closing  has been  scheduled  to
correspond with the close of business at the principal office of the Corporation
and,  regardless of when the last act, delivery,  or confirmation of the Closing
shall take place,  the transfer of the Shares shall be deemed to occur as of the
close of business at the principal  office of the Corporation on the date of the
Closing.

         9.       Termination.

                  9.1 Termination  for Cause.  If, pursuant to the provisions of
Section 6 or 7 of this  Agreement,  the Seller or the Purchaser is not obligated
at the  Closing  to  consummate  this  Agreement,  then the  party who is not so
obligated may terminate this Agreement.

                  9.2 Termination Without Cause. Anything herein or elsewhere to
the contrary notwithstanding,  this Agreement may be terminated and abandoned at
any time  without  further  obligation  or liability on the part of any party in
favor of any other by mutual consent of the Purchaser and the Seller.

                    9.3  Termination  Procedure.  Any party  having the right to
terminate this Agreement due to a failure of a condition  precedent contained in
Sections 6 or 7 hereto may


                                        7

<PAGE>



terminate  this  Agreement by delivering  to the other party  written  notice of
termination, and thereupon, this Agreement will be terminated without obligation
or liability of any party.

         10.      Miscellaneous Provisions.

                  10.1 Amendment and  Modification.  Subject to applicable  law,
this  Agreement  may be amended,  modified,  or  supplemented  only by a written
agreement signed by the Purchaser and the Seller.

                  10.2     Waiver of Compliance; Consents

                          10.2.1  Any  failure  of any party to comply  with any
obligation,  covenant, agreement, or condition herein may be waived by the party
entitled to the performance of such  obligation,  covenant,  or agreement or who
has the  benefit of such  condition,  but such  waiver or failure to insist upon
strict compliance with such obligation,  covenant,  agreement, or condition will
not operate as a waiver of, or estoppel with respect to, any subsequent or other
failure.

                          10.2.2  Whenever  this  Agreement  requires or permits
consent by or on behalf of any party  hereto,  such  consent  will be given in a
manner  consistent with the requirements for a waiver of compliance as set forth
above.

                  10.3  Payment  of  Fees  and  Expenses.  Each  party  to  this
Agreement  will be  responsible  for,  and  will  pay,  all of its own  fees and
expenses,  including those for its own counsel and accountants,  incurred in the
negotiation,  preparation,  and  consumption of this Agreement and this purchase
and sale.

                  10.4 Costs.  Each party hereto shall bear,  pay and  discharge
all of his/its respective expenses incurred in connection with the execution and
performance of this Agreement, except as otherwise provided specifically herein.

                  10.5 Entire Agreement;  Successors and Assigns; and Amendment;
Third  Parties.   Except  for  that  certain  Voting  Trust  Agreement  executed
concurrently  herewith and appended  hereto as Exhibit B and the Purchase Rights
Agreement executed  concurrently herewith and appended hereto as Exhibit A, this
Agreement  and the exhibits  appended  hereto  constitute  the entire  agreement
between the parties  concerning  the subject matter hereof and no party shall be
liable or bound to the other in any manner by any warranties, representations or
covenants  except as specifically  set forth herein.  Any previous or concurrent
agreement  among the  parties  with  respect  to the  subject  matter  hereof is
superseded by this  Agreement and the exhibits  appended  hereto.  The terms and
conditions of this  Agreement  shall inure to the benefit of and be binding upon
the respective executors,  administrators,  heirs, successors and assigns of the
parties. Except as expressly provided herein, nothing in this Agreement, express
or implied, is intended to confer upon any party, other than the parties hereto,
any rights,  remedies,  obligations  or  liabilities  under or by reason of this
Agreement.



                                        8

<PAGE>



                  10.6 Governing Law and Consent to Jurisdiction. This Agreement
shall be governed by and construed in  accordance  with the laws of the State of
California.  The parties irrevocably (i) submit to the exclusive jurisdiction of
the state  courts  of the  State of  California  over any  action or  proceeding
arising out of a breach of this Agreement, (ii) agree that all claims in respect
of such action or proceeding may be heard and  determined in such courts,  (iii)
waive,  to the  fullest  extent  they may  effectively  do so, the defense of an
inconvenient  or  inappropriate  forum  to the  maintenance  of such  action  or
proceeding,  (iv) agree that any communication  given in accordance with Section
10.9,  to the fullest  extent  permitted  by law,  shall be taken and held to be
valid personal service and personal  delivery to such party for the purposes set
forth in this  Section,  and (v) waive  any  defense  based on lack of  personal
jurisdiction for any such purpose.

                  10.7 Legal Action and Fees.  In the event of any  controversy,
claim or dispute  between the parties  hereto arising out of or relating to this
Agreement,  the  prevailing  party  shall  be  entitled  to  recovery  from  the
non-prevailing party its reasonable  expenses,  including but not limited to its
reasonable attorneys' fees.

                  10.8 Headings.  The headings of the sections of this Agreement
are for  convenience  only and shall not  determine the  interpretation  of this
Agreement.

                  10.9 Notices. Any notice required or permitted hereunder shall
be given in  writing  and  shall  be  deemed  effectively  given  upon  personal
delivery, 24 hours after transmission by telecopy, telex, or five (5) days after
deposit in the United States mail by registered or certified mail,  addressed as
set forth below or at such other address as such party may designate by ten (10)
days' advance written notice to the other party:

                  If to Seller:             David Katz, M.D.
                                            1775 La Jolla Rancho Road
                                            La Jolla, CA 92037

                  If to Purchaser:          HealthMed, Inc.
                                            8306 Wilshire Boulevard, Suite 7056
                                            Beverly Hills, California 90211
                                            Attention: President

                  10.10  Counterparts.  This Agreement may be executed in two or
more counterparts,  each of which shall be deemed an original,  but all of which
together shall constitute one and the same instrument.

                  10.11 Other  Documents.  Seller  shall,  at any time after the
Closing  and upon the  request  of the  Purchaser,  execute  and  deliver to the
Purchaser such documents or instruments of conveyance,  license or assignment or
take such other  action as is  reasonably  necessary to complete the transfer of
the Shares or other  transactions  contemplated  by this Agreement or to perfect
the interest of the Purchaser  therein.  Further,  the parties agree to take all
actions and file such documents  required to comply with  California  securities
laws.


                                        9

<PAGE>



                  10.12 Legal Advice.  The parties hereby  acknowledge that they
have  received  independent  legal  advice from  attorneys  of their choice with
respect  to the  advisability  of  executing  this  Agreement  and  the  related
documents affecting this transaction.  Prior to the execution of this Agreement,
each of the  parties'  attorneys  reviewed  this  Agreement  and  discussed  the
Agreement with such party, and each party made all desired changes.  Each of the
parties and their attorneys have made such investigation of the facts pertaining
to this  Agreement  and all of the matters  appertaining  thereto as they deemed
necessary.  Each of the parties  certifies that it has read this Agreement,  and
fully  understands this Agreement and that it has executed it voluntarily,  free
of any duress, force or undue influence of any party or any person.

         IN WITNESS  WHEREOF,  the parties  hereto have executed this  Agreement
effective as of the date first set forth above.

                                         SELLER:


                                         ---------------------------------
                                         DAVID KATZ, M.D.


                                         PURCHASER:

                                         HEALTHMED, INC.


                                         By:_________________________________
                                            Mitchell J. Stein
                                            Its: President & Secretary



                                       10

<PAGE>



                CONSENT OF SPOUSE, COHABITANT OR DOMESTIC PARTNER

     The undersigned  spouse,  cohabitant or domestic partner of the Shareholder
acknowledges on her behalf that: I have read the foregoing  Agreement and I know
its contents.  I am aware that by its provisions  that my spouse,  cohabitant or
domestic  partner sells to Purchaser  thirty  percent (30%) of his Shares in the
Company,  including  my  community  interest  in them.  I hereby  consent to and
approve of the provisions of the  Agreement,  and agree that those Shares and my
interest in them are subject to the  provisions of the Agreement and that I will
take no action at any time to hinder  operation of the Agreement on those Shares
or my interest in them.



Signature:__________________________________

Print Name:____________________________




                                       11

<PAGE>



                                  EXHIBITS 1.3




                                       12

<PAGE>



                                    EXHIBIT A




                                       13

<PAGE>


                                    EXHIBIT B



                                       14


                            PURCHASE RIGHTS AGREEMENT


         This PURCHASE RIGHTS AGREEMENT  ("Agreement") is entered into this 12th
day of January,  1998,  by and between  HealthMed,  Inc.,  a Nevada  corporation
("Purchaser") and David Katz, M.D. ("Seller").

                                    RECITALS

         A. LIDAK Pharmaceuticals,  a California corporation (the "Corporation")
presently has  outstanding two classes of common stock  (individually,  "Class A
Shares" and "Class B Shares" and collectively, the "Shares"), of which 1,918,400
derivative  Class A Shares and  375,000 of  derivative  Class B Shares have been
granted to Seller (the "Derivative Shares"), a schedule of the Derivative Shares
granted to Seller and as reflected on Seller's  January 5, 1998 Form 4 filing is
appended hereto as Exhibit A and incorporated herein by this reference.

         B.  The  Derivative   Shares  are  collectively  the  only  issued  and
outstanding derivative capital stock of the Corporation held by Seller.

         C. The  parties  hereto are  parties  to that  certain  Stock  Purchase
Agreement  dated of even date herewith,  which  agreement is appended  hereto as
Exhibit B and incorporated herein by this reference.

         D. As and for the  consideration  hereinafter  set  forth,  the  Seller
desires to exercise the  Derivative  Shares in his sole and absolute  discretion
and thereafter  deliver to the Purchaser thirty one and one-half percent (31.5%)
of the exercised Derivative Shares or thirty one and one-half percent (31.5%) of
the net  proceeds  from  exercise  and sale of the  Derivative  Shares  owned by
Seller,  or exercise  Purchaser's right to exercise the Derivative Shares in the
event of Seller's permanent incapacity or death, on the terms and subject to the
conditions set forth herein.

                                    AGREEMENT

         NOW,  THEREFORE,  in  consideration  of the  covenants  and  conditions
contained  herein,  the rights and  obligations  of Purchaser  and Seller as set
forth in the Stock  Purchase  Agreement by and between  Seller and  Purchaser of
even date herewith, and for other good and valuable  consideration,  the receipt
and  sufficiency of which are hereby  acknowledged,  the parties hereby agree as
follows:

         1.       Purchase Participation.

                  1.1  Exercise  of  Derivative  Shares.  For good and  valuable
consideration  the receipt and  sufficiency of which are hereby  acknowledged by
Seller,  Seller hereby grants to Purchaser the irrevocable right, for the period
and on the terms herein set forth, to receive thirty


                                        1

<PAGE>



one and one-half  percent (31.5%) of the Net Proceeds (as  hereinafter  defined)
from Seller's exercise and sale of the Derivative Shares.

                  1.2 Net Proceeds. "Net Proceeds" shall mean the gross proceeds
from the  Seller's  exercise  and sale of the  Derivative  Shares,  less the (i)
exercise price paid (or payable in a cashless exercise) by Seller; (ii) broker's
commissions,  expenses and costs incurred by Seller in connection  with the sale
of the  Derivative  Shares;  and (iii)  federal  and state  income  taxes on the
exercise of the Derivative Shares paid or payable by Seller.

                  1.3 Seller  Warranty  Not to  Encumber.  Seller  warrants  and
undertakes  that  during  the term of this  Agreement,  he shall  not  assign or
encumber the  Derivative  Shares or any rights in them,  nor make any commitment
with respect thereto inconsistent with the terms of this Agreement.

                  1.4 Expiration  Date.  This Agreement shall expire at midnight
on June 21, 2007 (the "expiration date").

                  1.5  Method  of  Exercise.  Concurrently  with  the  execution
hereof,  the parties  hereto shall open three (3)  brokerage  accounts at Stuart
Coleman & Co.,  Inc., 11 W. 42nd Street,  15th Floor,  New York, New York 10036,
telephone no. (800) 724-0761 (the  "Brokerage")  and Seller shall deliver notice
and supporting  documentation to the Brokerage depositing the Derivative Shares,
as  follows:  (i) a joint  account of Seller and  Purchaser;  (ii) an account of
Seller ("Seller's  Account");  and (iii) and account of Purchaser  ("Purchaser's
Account").  Thereafter,  and during the term of this  Agreement,  the  Brokerage
shall execute each and every exercise of the  Derivative  Shares and deliver the
Net  Proceeds to  Purchaser  and Seller as follows:  (a) thirty one and one-half
percent (31.5%) to Purchaser's  Account  ("Purchaser's  Interest"),  and (b) the
balance to Seller's Account ("Seller's Interest").  This Derivative Shares shall
be  exercisable,  on or before the  expiration  date, by written  notice sent to
Purchaser by facsimile  transmission or sent by registered mail,  return receipt
requested,  addressed  as  hereinafter  set forth,  notifying  Purchaser of such
exercise and its right to participation in the Net Proceeds thereof.

                  1.6 Deliveries. If Seller exercises his option to purchase and
sale the  Derivative  Shares as  aforesaid,  the  Brokerage  shall  (i)  deposit
Purchaser's  Interest into the  Purchaser's  Account within three (3) days after
the  purchase  and sale of the  Derivative  Shares;  and (ii)  deposit  Seller's
Interest into the Seller's  Account within three (3) days after the purchase and
sale of the Derivative  Shares;  provided that in the event  Purchaser shall not
timely receive the Purchaser's Interest,  Seller shall thereafter have three (3)
days in which to deposit into the Purchaser's Account the Purchaser's Interest.

                  1.7  Adjustments.  In the event of any change in the Shares by
reason of any stock dividend, recapitalization, splitup, combination or exchange
of shares, or of any similar change affecting the Derivative Shares, then in any
such event,  the number and kind of shares  subject to this  Agreement  shall be
appropriately adjusted consistent with such change in such


                                        2

<PAGE>



manner as to prevent  substantial  dilution or enlargement of the rights granted
to, or available for, the Purchaser hereunder.

                  1.8 No Rights as  Shareholder.  Purchaser shall have no rights
as a shareholder  with respect to the Corporation  prior to the date of exercise
of the Derivative  Shares or the issuance of a certificate or  certificates  for
such shares.

                  1.9 Grant of Option.  By execution of this  Agreement,  Seller
hereby  grants to the  Purchaser  the option to cause the  Seller,  or  Seller's
conservator,  executor or authorized  agent, to exercise all or a portion of the
Derivative  Shares  ("Option"),  upon the terms and conditions set forth in this
subsection:

                       (i)  The   permanent   incapacity  of  the  Seller  where
"permanent   incapacity",   as  used  herein,  shall  mean  mental  or  physical
incapacity,  or  both,  reasonably  determined  by the  Corporation's  Board  of
Directors or the Purchaser based upon a certification  of such incapacity by, in
the discretion of the Purchaser or the Corporation's Board of Directors,  either
Seller's regularly  attending physician or a duly licensed physician selected by
the  Purchaser or the  Corporation's  Board of  Directors,  rendering the Seller
unable  to  perform  substantially  all of his  duties  hereunder  or under  his
employment  relationship  with the  Corporation  and  which  appears  reasonably
certain  to  continue  for  at  least  three  (3)  consecutive   months  without
substantial  improvement.  Seller  shall be deemed to have  "become  permanently
incapacitated"  on the date either the Purchaser or the  Corporation's  Board of
Directors  has  determined  that  Seller  is  permanently  incapacitated  and so
notifies Seller.

                       (ii)  The  death  of  Seller  during  the  term  of  this
Agreement.

                  1.10  Exercise of Option.  Exercise  of the option  granted in
Section 1.9 of this  Agreement  shall be  accomplished  by written notice to the
Corporation  and the Brokerage in  accordance  with Sections 1.5 and 1.6 of this
Agreement.  Payment of the exercise price upon the exercise of the Option of the
Derivative Shares shall be made with funds of the Purchaser.

         2.  Representations and Warranties the Seller. As a material inducement
to the  Purchaser to enter into this  Agreement  and  purchase  the Shares,  the
Seller represents and warrants that:

                  2.1 Ownership of the Shares. Seller is the owner, beneficially
and of record, of the Shares being  transferred  pursuant to this Agreement free
and clear of all  liens,  charges,  claims,  encumbrances,  security  interests,
equities,  restrictions  on  transfer  or other  defects in title of any kind or
description.

                  2.2 Authority to Enter into Agreements; Enforceability. Seller
has the right,  power and authority to enter into and to carry out the terms and
provisions of this Agreement,


                                        3

<PAGE>



without  obtaining the approval or consent of any other party or authority,  and
this Agreement is a legal, valid and binding agreement of Seller, enforceable in
accordance with its terms.

                  2.3  No  Conflict.  The  execution  and  performance  of  this
Agreement by Seller will not violate any agreement,  promissory  note,  security
arrangement,  order or other  instrument to which Seller are a party or by which
Seller may be bound.

                  2.4 Litigation.  To the best knowledge of Seller, there are no
suits,  actions  or  legal,  administrative,  arbitration  or other  proceedings
pending,  filed or initiated by or against the  Corporation  occurring since the
issuance of the Form 10K dated September 30, 1997.

                  2.5  Disclosure.   Neither  this  Agreement  nor  any  of  the
schedules,  attachments, written statements,  documents,  certificates, or other
items  prepared or supplied to the  Purchaser by or on behalf of the Seller with
respect to this purchase contain any untrue statement of a material fact or omit
a material fact necessary to make each statement contained herein or therein not
misleading.  The Seller has not intentionally concealed any fact known by him to
have a material  adverse  effect  upon the  Corporation's  existing  or expected
financial condition,  operating results,  assets,  customer relations,  employee
relations, or business prospects taken as a whole.

         3.   Representations  and  Warranties  of  Purchaser.   As  a  material
inducement to the Seller to enter into this  Agreement and sell the Shares,  the
Purchaser hereby represents and warrants to the Seller as follows:

                  3.1  Organization;  Power. The Purchaser is a corporation duly
incorporated and validly existing under the laws of the State of California, and
has all requisite corporate power and authority to enter into this Agreement and
perform its obligations hereunder.

                  3.2 Authorization. The execution, delivery, and performance by
the Purchaser of this Agreement and all other agreements  contemplated hereby to
which the  Purchaser  is a party have been duly and  validly  authorized  by all
necessary  corporate  action of the Purchaser,  and this Agreement and each such
other  agreement,  when  executed  and  delivered by the parties  thereto,  will
constitute the legal, valid, and binding obligation of the Purchaser enforceable
against it in accordance with its terms, except as enforceability may be limited
by applicable bankruptcy,  insolvency, and similar statutes affecting creditors'
rights generally and judicial limits on equitable remedies.

                  3.3 No Conflict  with Other  Instruments  or  Agreements.  The
execution,  delivery, and performance by the Purchaser of this Agreement and all
other agreements  contemplated hereby to which the Purchaser is a party will not
result in a breach or violation of, or constitute a default under,  its Articles
of Incorporation or Bylaws or any material agreement to which the Purchaser is a
party or by which the Purchaser is bound.



                                        4

<PAGE>



                  3.4 Litigation.  There are no actions, suits, proceedings,  or
governmental  investigations  or inquiries  pending or, to the  knowledge of the
Purchaser,   threatened  against  the  Purchaser  or  its  properties,   assets,
operations,  or businesses that might delay, prevent, or hinder the consummation
of this purchase.

                  3.5      Investment Representations.

                          3.5.1 The  Purchaser  is an  "accredited  investor" as
defined by the SEC's Rule 501(a),  and the Purchaser has substantial  experience
in evaluating and investing in private  placement  transactions of securities in
companies  similar  to the  Corporation  so that the  Purchaser  is  capable  of
evaluating the merits and risks of the Purchaser's investment in the Corporation
and has the capacity to protect the Purchaser's own interests.

                          3.5.2  The  Purchaser  is  acquiring  the  Shares  for
investment for the Purchaser's own account,  not as a nominee or agent,  and not
with the view to, or for resale in connection  with, any  distribution  thereof.
The Purchaser  understands  that the Shares to be purchased  have not been,  and
will not be,  registered  under the Securities Act or the securities laws of any
state by reason of a specific exemption from the registration  provisions of the
Securities Act and the applicable  state  securities  laws, the  availability of
which depends upon,  among other things,  the bona fide nature of the investment
intent and the accuracy of the Purchaser's  representations as expressed herein.
The Purchaser is acquiring the Shares without  expectation,  desire, or need for
resale  and not with the  view  toward  distribution,  resale,  subdivision,  or
fractionalization of the Shares.

                          3.5.3  During  the course of the  negotiation  of this
Agreement,  the Purchaser has had an  opportunity  to discuss the  Corporation's
business, management and financial affairs with the Corporation's management and
the  opportunity to review the  Corporation's  financial  statements,  books and
records, facilities and business plan. The Purchaser has also had an opportunity
to ask questions of officers of the  Corporation,  which questions were answered
to the Purchaser's satisfaction.

                          3.5.4 The Purchaser  understands that the Shares to be
purchased have not been registered under Securities Act of 1933 ("1933 Act"), or
under any state securities law.

                          3.5.5 The Purchaser understands that the Shares cannot
be resold in a transaction to which the 1933 Act and state securities laws apply
unless  (i)  subsequently  registered  under the 1933 Act and  applicable  state
securities laws or (ii) exemptions from such  registrations  are available.  The
Purchaser is aware of the provisions of Rule 144 promulgated  under the 1933 Act
which permit limited resale of shares purchased in a private transaction subject
to the satisfaction of certain conditions.

                          3.5.6 The Purchaser  understands that no public market
now exists for the Shares and that it is  uncertain  that a public  market  will
ever exist for the Shares.


                                        5

<PAGE>



                          3.5.7 The Purchaser  understands that the certificates
for the Shares will bear the following legend:

                  THIS  CERTIFICATE HAS NOT BEEN REGISTERED UNDER THE SECURITIES
                  ACT  OF  1933.   THE   CORPORATION   WILL  NOT  TRANSFER  THIS
                  CERTIFICATE  UNLESS  (i)  THERE IS AN  EFFECTIVE  REGISTRATION
                  COVERING THE SHARES  REPRESENTED BY THIS CERTIFICATE UNDER THE
                  SECURITIES  ACT OF 1933 AND ALL  APPLICABLE  STATE  SECURITIES
                  LAWS,  (ii) IT  FIRST  RECEIVES  A  LETTER  FROM AN  ATTORNEY,
                  ACCEPTABLE TO THE BOARD OF DIRECTORS OF THE CORPORATION OR ITS
                  AGENTS,  STATING  THAT  IN THE  OPINION  OF THE  ATTORNEY  THE
                  PROPOSED  TRANSFER  IS  EXEMPT  FROM  REGISTRATION  UNDER  THE
                  SECURITIES  ACT  OF  1933  AND  UNDER  ALL  APPLICABLE   STATE
                  SECURITIES  LAWS,  OR (iii) THE  TRANSFER IS MADE  PURSUANT TO
                  RULE 144 UNDER THE SECURITIES ACT OF 1933, AS AMENDED.

                  3.6  Tax  Liability.   To  the  extent  the  Purchaser   deems
necessary,  the Purchaser has reviewed with the Purchaser's own tax advisors the
federal,  state,  local and foreign tax  consequences of this investment and the
transactions contemplated by this Agreement. The Purchaser relies solely on such
advisors and not on any  statements or  representations  of the Seller or any of
its agents.  The Purchaser  understands  that the Purchaser (and not the Seller)
shall be responsible  for the  Purchaser's own tax liability that may arise as a
result of this investment or the transactions contemplated by this Agreement.

                  3.7 Disclosure.  To the Purchaser's knowledge, this Agreement,
with the  Exhibits  hereto,  when taken as a whole,  does not contain any untrue
statement  of a  material  fact  concerning  the  Purchaser  or omit to  state a
material fact necessary in order to make the statements concerning the Purchaser
contained herein not misleading in light of the  circumstances  under which they
were made.

                  3.8 Compliance with Other Instruments. The execution, delivery
and  performance  of and  compliance  with this  Agreement,  and the issuance of
shares  will not result in any  material  violation  of, or  conflict  with,  or
constitute a material default under,  any Purchaser's  articles of incorporation
or  bylaws  or any of the  Purchaser's  material  agreements  nor  result in the
creation of any mortgage, pledge, lien, encumbrance or charge against any of the
assets or properties of the Corporation or the Shares.

         4. Conditions Precedent to the Obligations of Purchaser. Each and every
obligation of the Purchaser under this Agreement is subject to the satisfaction,
at or before the Closing, of each of the following conditions:


                                        6

<PAGE>



                  4.1 Representations and Warranties;  Performance.  Each of the
representations  and  warranties  made by the  Seller  herein  will be true  and
correct in all  material  respects  as of the  Closing  with the same  effect as
though made at that time except for changes contemplated, permitted, or required
by this  Agreement;  the  Seller  will  have  performed  and  complied  with all
agreements, covenants, and conditions required by this Agreement to be performed
and complied  with by them prior to the  Closing;  and the  Purchaser  will have
received,  at the Closing,  a certificate  of the Seller,  signed by the Seller,
stating  that each of the  representations  and  warranties  made by the  Seller
herein are true and correct in all  material  respects as of the Closing  except
for changes contemplated,  permitted, or required by this Agreement and that the
Seller has performed and complied with all agreements, covenants, and conditions
required by this Agreement to be performed and complied with by him prior to the
Closing.

                  4.2 Legal Opinion.  Each and every obligation of the Purchaser
under this Agreement is subject to the delivery, at or before the Closing, of an
opinion of Luce, Forward, Hamilton & Scripps LLP, in form and content reasonably
acceptable to the Purchaser and its legal  counsel,  to the effect that (i) this
Agreement has been duly executed and  delivered by Seller;  (ii) this  Agreement
and each other agreement contemplated hereby, when executed and delivered by the
parties thereto, will constitute the legal, valid, and binding obligation of the
Seller,  enforceable  against the Seller in accordance  with its terms except as
the  enforceability  thereof may be limited by the  application  of  bankruptcy,
insolvency,  moratorium,  or similar  laws  affecting  the  rights of  creditors
generally  or judicial  limits on the right of specific  performance;  and (iii)
except as set forth in Schedule 4.2, the execution and delivery by the Seller of
this Agreement and all other agreements  contemplated hereby to which the Seller
is a party, the offering and sale of the Shares hereunder and the fulfillment of
and compliance  with the respective  terms hereof and thereof by the Seller,  do
not and  will  not (a)  conflict  with  or  result  in a  breach  of the  terms,
conditions or provisions of, (b)  constitute a default under,  (c) result in the
creation of any lien, security interest, charge, or encumbrance upon the capital
stock or assets of the Seller,  (d) give any third party the right to accelerate
any  obligation  under,  (e)  result  in a  violation  of,  or (f)  require  any
authorization, consent, approval, exemption, or other action by or notice to any
court or  administrative  or governmental  body, or any law,  statute,  rule, or
regulation to which the Seller is subject, or any agreement,  instrument, order,
judgment,  or decree to which the  Seller  is  subject;  (iv) to such  counsel's
knowledge, Seller owns the Shares.

         5. Conditions  Precedent to the  Obligations of Seller.  Each and every
obligation of the Seller under this Agreement is subject to the satisfaction, at
the Closing, of each of the representations and warranties made by the Purchaser
herein  and  such  representations  will be true  and  correct  in all  material
respects  as of the  Closing  with the same  effect as though  made at that time
except for changes contemplated,  permitted, or required by this Agreement;  the
Purchaser will have performed and complied with all agreements,  covenants,  and
conditions  required by this  Agreement to be performed  and complied with by it
prior to the Closing;  and the Sellers  will have  received,  at the Closing,  a
certificate of the  Purchaser,  signed by the President and the Secretary or the
Chief   Financial   Officer  of  the   Purchaser,   stating  that  each  of  the
representations  and warranties made by the Purchaser herein is true and correct
in all material respects as of the


                                        7

<PAGE>



Closing  except  for  changes  contemplated,  permitted,  or  required  by  this
Agreement and that the Purchaser has performed and complied with all agreements,
covenants,  and  conditions  required  by this  Agreement  to be  performed  and
complied with by it prior to the Closing.

         6.       Closing.

                  6.1 Time, Place, and Manner of Closing.  Unless this Agreement
has been  terminated and this  transaction  has been  abandoned  pursuant to the
provisions of Section 7, the closing  ("Closing") will be held at the offices of
Stein Perlman & Hawk, or such other place as the parties may agree,  on the date
that Seller shall exercise its right to purchase the Shares as  hereinabove  set
forth, the date that Purchaser  instructs Seller to exercise the purchase of all
or  some  of the  Derivative  Shares  as  hereinabove  set  forth  or as soon as
practicable  after the satisfaction of the various  conditions  precedent to the
Closing set forth  herein.  At the Closing  the parties to this  Agreement  will
exchange  certificates and other instruments and documents in order to determine
whether the terms and conditions of this Agreement have been satisfied. Upon the
determination of each party that its conditions to consummate this purchase have
been  satisfied or waived,  the Brokerage  shall  deliver to the parties  hereto
notice of the  purchase and sale of the  Derivative  Shares sold and confirm the
deposits  into the  Purchaser's  Account  and the  Seller's  Account.  After the
Closing,  the Seller,  at the  Purchaser's  cost,  will  execute,  deliver,  and
acknowledge  all such further  instruments  of transfer and  conveyance and will
perform  all  such  other  acts  as the  Purchaser  may  reasonably  request  to
effectively transfer and release the Purchaser's Interest.

                  6.2  Consummation  of  Closing.  All  acts,  deliveries,   and
confirmations  comprising the Closing regardless of chronological sequence shall
be deemed to occur  contemporaneously  and simultaneously upon the occurrence of
the last act,  delivery,  or  confirmation of the Closing and none of such acts,
deliveries, or confirmations shall be effective unless and until the last of the
same  shall  have  occurred.  The  time of the  Closing  has been  scheduled  to
correspond with the close of business at the office of Stein Perlman & Hawk and,
regardless of when the last act, delivery,  or confirmation of the Closing shall
take place,  the purchase and sale of the  Derivative  Shares shall be deemed to
occur as of the close of business  at the office of Stein  Perlman & Hawk on the
date of the Closing.

         7.       Termination.

                  7.1 Termination Without Cause. Anything herein or elsewhere to
the contrary notwithstanding,  this Agreement may be terminated and abandoned at
any time  without  further  obligation  or liability on the part of any party in
favor of any other by mutual consent of the Purchaser and the Seller.

                  7.2  Termination  Date.  This  Agreement  shall  automatically
terminate on as set forth in paragraph 1.4 above.



                                        8

<PAGE>



         8.       Miscellaneous Provisions.

                  8.1 Amendment  and  Modification.  Subject to applicable  law,
this  Agreement  may be amended,  modified,  or  supplemented  only by a written
agreement signed by the Purchaser and the Seller.

                  8.2      Waiver of Compliance; Consents

                        8.2.1  Any  failure  of any  party  to  comply  with any
obligation,  covenant, agreement, or condition herein may be waived by the party
entitled to the performance of such  obligation,  covenant,  or agreement or who
has the  benefit of such  condition,  but such  waiver or failure to insist upon
strict compliance with such obligation,  covenant,  agreement, or condition will
not operate as a waiver of, or estoppel with respect to, any subsequent or other
failure.

                        8.2.2  Whenever  this  Agreement   requires  or  permits
consent by or on behalf of any party  hereto,  such  consent  will be given in a
manner  consistent with the requirements for a waiver of compliance as set forth
above.

                  8.3 Payment of Fees and Expenses. Each party to this Agreement
will be  responsible  for,  and will  pay,  all of its own  fees  and  expenses,
including  those  for  its  own  counsel  and   accountants,   incurred  in  the
negotiation,  preparation,  and  consumption of this Agreement and this purchase
and sale.

                  8.4 Costs. Each party hereto shall bear, pay and discharge all
of his/its  respective  expenses  incurred in connection  with the execution and
performance of this Agreement, except as otherwise provided specifically herein.

                  8.5 Entire Agreement;  Successors and Assigns;  and Amendment;
Third Parties.  This Agreement and the exhibits  appended hereto  constitute the
entire agreement between the parties concerning the subject matter hereof and no
party  shall be liable or bound to the  other in any  manner by any  warranties,
representations  or  covenants  except as  specifically  set forth  herein.  Any
previous or concurrent  agreement  among the parties with respect to the subject
matter hereof is superseded by this Agreement and the exhibits  appended hereto.
The terms and conditions of this Agreement  shall inure to the benefit of and be
binding upon the respective  executors,  administrators,  heirs,  successors and
assigns of the parties.  Except as expressly  provided  herein,  nothing in this
Agreement,  express or implied, is intended to confer upon any party, other than
the parties hereto, any rights, remedies, obligations or liabilities under or by
reason of this Agreement.

                  8.6 Governing Law and Consent to Jurisdiction.  This Agreement
shall be governed by and construed in  accordance  with the laws of the State of
California.  The parties irrevocably (i) submit to the exclusive jurisdiction of
the state  courts  of the  State of  California  over any  action or  proceeding
arising out of a breach of this Agreement, (ii) agree that all claims in respect
of such action or proceeding may be heard and  determined in such courts,  (iii)
waive, to


                                        9

<PAGE>



the fullest extent they may effectively do so, the defense of an inconvenient or
inappropriate  forum to the  maintenance of such action or proceeding,  and (iv)
waive any defense based on lack of personal jurisdiction for any such purpose.

                  8.7 Legal  Action and Fees.  In the event of any  controversy,
claim or dispute  between the parties  hereto arising out of or relating to this
Agreement,  the  prevailing  party  shall  be  entitled  to  recovery  from  the
non-prevailing party its reasonable  expenses,  including but not limited to its
reasonable attorneys' fees.

                  8.8 Headings.  The headings of the sections of this  Agreement
are for  convenience  only and shall not  determine the  interpretation  of this
Agreement.

                  8.9 Notices.  Any notice required or permitted hereunder shall
be given in  writing  and  shall  be  deemed  effectively  given  upon  personal
delivery, 24 hours after transmission by telecopy, telex, or five (5) days after
deposit in the United States mail by registered or certified mail,  addressed as
set forth below or at such other address as such party may designate by ten (10)
days' advance written notice to the other party:

                 If to Seller:             David Katz, M.D.
                                           1775 La Jolla Rancho Road
                                           La Jolla, California 92037

                 If to Purchaser:          HealthMed, Inc.
                                           8306 Wilshire Boulevard, Suite 7056
                                           Beverly Hills, California 90211
                                           Attention: President

                  8.10  Counterparts.  This  Agreement may be executed in two or
more counterparts,  each of which shall be deemed an original,  but all of which
together shall constitute one and the same instrument.

                  8.11  Other  Documents.  Seller  shall,  at any time after the
Closing and upon the request of the  Purchaser or the  Corporation,  execute and
deliver to the Purchaser or the Corporation,  as the case may be, such documents
or instruments of conveyance, license or assignment or take such other action as
is  reasonably  necessary  to  complete  the  transfer  of the  Shares  or other
transactions  contemplated  by this  Agreement or to perfect the interest of the
Purchaser therein.  Further, the parties agree to take all actions and file such
documents required to comply with California securities laws.

                  8.12 Legal Advice.  The parties hereby  acknowledge  that they
have  received  independent  legal  advice from  attorneys  of their choice with
respect  to the  advisability  of  executing  this  Agreement  and  the  related
documents affecting this transaction.  Prior to the execution of this Agreement,
each of the parties' attorneys reviewed this Agreement and


                                       10

<PAGE>



discussed  the  Agreement  with such  party,  and each  party  made all  desired
changes. Each of the parties and their attorneys have made such investigation of
the facts  pertaining  to this  Agreement  and all of the  matters  appertaining
thereto as they deemed necessary. Each of the parties certifies that it has read
this Agreement, and fully understands this Agreement and that it has executed it
voluntarily,  free of any duress,  force or undue  influence of any party or any
person.

                  8.13  Injunctive  Relief.  The parties hereby  acknowledge and
agree that any default  under Section 1 above will cause damage to the Purchaser
in an amount  difficult  to  ascertain.  Accordingly,  in  addition to any other
relief to which the Purchaser may be entitled,  the Purchaser  shall be entitled
to  such  injunctive  relief  as  may  be  ordered  by any  court  of  competent
jurisdiction  including,  but not  limited  to, an  injunction  restraining  any
violation of Section 1 above and without the proof of actual damages.

         IN WITNESS  WHEREOF,  the parties  hereto have executed this  Agreement
effective as of the date first set forth above.

                                       SELLER:



                                       ---------------------------------
                                       DAVID KATZ, M.D.

                                       PURCHASER:

                                       HEALTHMED, INC.



                                       By:_________________________________
                                          Mitchell J. Stein
                                          Its: President & Secretary

AGREED TO AND ACKNOWLEDGED BY
PARAGRAPHS 1.5 AND 1.6 ONLY:

STUART COLEMAN & CO., INC.



By:______________________________________
     Print Name:________________
     Its: Authorized Officer


                                       11

<PAGE>



                CONSENT OF SPOUSE, COHABITANT OR DOMESTIC PARTNER

          The  undersigned  spouse,   cohabitant  or  domestic  partner  of  the
Shareholder acknowledges on her behalf that: I have read the foregoing Agreement
and I know its  contents.  I am aware  that by its  provisions  that my  spouse,
cohabitant or domestic partner grants Purchaser an interest in his Shares in the
Company,  including  my  community  interest  in them.  I hereby  consent to and
approve of the provisions of the  Agreement,  and agree that those Shares and my
interest in them are subject to the  provisions of the Agreement and that I will
take no action at any time to hinder  operation of the Agreement on those Shares
or my interest in them.



Signature:__________________________________

Print Name:____________________________




                                       12

<PAGE>



                                    EXHIBIT A




                                       13

<PAGE>


                                    EXHIBIT B




                                       14


                            STOCK PURCHASE AGREEMENT


         This STOCK PURCHASE  AGREEMENT  ("Agreement") is entered into this 12th
day of January,  1998,  by and between  HealthMed,  Inc.,  a Nevada  corporation
("Purchaser")  and Medical  Biology  Institute,  a California  nonprofit  public
benefit corporation ("Seller").

                                    RECITALS

         A. LIDAK Pharmaceuticals,  a California corporation (the "Corporation")
presently has  outstanding two classes of common stock  (individually,  "Class A
Shares" and "Class B Shares" and collectively,  the "Shares"),  of which 217,000
Class A Shares have been issued to Seller.

         B. The Shares are collectively the only issued and outstanding  capital
stock of the Corporation held by Seller.

         C. The Purchaser  desires to purchase from Seller and Seller desires to
sell to the Purchaser  65,100 of the Class A Shares and thirty  percent (30%) of
the Class B Shares  owned by Seller on the terms and  subject to the  conditions
set forth herein.

                                    AGREEMENT

         NOW, THEREFORE, IT IS AGREED AS FOLLOWS:

         1.       Purchase of Shares.

                  1.1  Purchase of Shares.  Subject to the terms and  conditions
set forth herein,  at the Closing (as defined  below) Seller will sell 65,100 of
the Class A Shares  and  thirty  percent  (30%) of the  Class B Shares  owned by
Seller to the Purchaser and the Purchaser will purchase all of such Shares owned
by Seller from Seller,  such Shares  constituting thirty percent (30%) of all of
the issued and outstanding  capital stock of the Corporation  owned by Seller as
of the Closing.

                  1.2 Purchase  Price.  The Purchase  Price shall be Two Hundred
Sixty  Three  Thousand  Four and  No/100  Dollars  ($263,004.00)  for the Shares
purchased hereby (referred herein to as the "Purchase Price").

                  1.3 Payment of Purchase Price. The Purchase Price will be paid
to  Seller  by  Purchaser's  delivery  to  Seller  of a  promissory  note in the
principal sum of the Purchase Price and in substantially the form of Exhibit 1.3
hereto at the Closing (the  "Note"),  such Note to be at the rate of ten percent
(10%)  per  annum  computed  on the  basis of a year of 360 days for the  actual
number of days  elapsed and shall  additionally  provide for annual  payments of
interest only with principal due and payable on the second (2nd)  anniversary of
such  Note,  and the Note  shall not be  subject  to any  prepayment  penalties;
provided, however, that in the event the last stock purchase


                                        1

<PAGE>



price on the first (1st)  anniversary  date of this  Agreement of the  Company's
Class A common  stock on the public  market  equals or  exceeds  Nine and No/100
Dollars  ($9.00),  then One Hundred  Thirty Two Thousand  Eight Hundred Four and
No/100 ($132,804.00) of the amount due on the Note shall be accelerated from the
maturity  date  thereof and shall be due and payable no later than  fifteen (15)
days thereafter.

         2.  Representations  and Warranties of Seller. As a material inducement
to the  Purchaser to enter into this  Agreement  and  purchase  the Shares,  the
Seller represents and warrants that:

                  2.1  Organization;   Power;   Ownership  of  the  Shares.  The
Purchaser is a corporation duly incorporated and validly existing under the laws
of the State of California,  and has all requisite corporate power and authority
to enter into this Agreement and perform its  obligations  hereunder.  Seller is
the owner,  beneficially and of record, of the Shares being transferred pursuant
to this Agreement free and clear of all liens,  charges,  claims,  encumbrances,
security interests, equities, restrictions on transfer or other defects in title
of any kind or description.

                  2.2 Authority to Enter into  Agreements;  Enforceability.  The
execution,  delivery,  and  performance  by the Seller of this Agreement and all
other  agreements  contemplated  hereby to which the Seller is a party have been
duly and validly authorized by all necessary corporate action of the Seller, and
this Agreement and each such other agreement, when executed and delivered by the
parties thereto, will constitute the legal, valid, and binding obligation of the
Seller  enforceable   against  it  in  accordance  with  its  terms,  except  as
enforceability may be limited by applicable bankruptcy,  insolvency, and similar
statutes affecting  creditors' rights generally and judicial limits on equitable
remedies.

                  2.3  No  Conflict.  The  execution  and  performance  of  this
Agreement by Seller will not violate any agreement,  promissory  note,  security
arrangement,  order or other  instrument  to which Seller is a party or by which
Seller may be bound.

                  2.4 Litigation.  To the best knowledge of Seller, there are no
suits,  actions  or  legal,  administrative,  arbitration  or other  proceedings
pending, filed or initiated by or against the Corporation.

                  2.5  Disclosure.   Neither  this  Agreement  nor  any  of  the
schedules,  attachments, written statements,  documents,  certificates, or other
items  prepared or supplied to the  Purchaser by or on behalf of the Seller with
respect to this purchase contain any untrue statement of a material fact or omit
a material fact necessary to make each statement contained herein or therein not
misleading.  The Seller has not intentionally  concealed any fact known by it to
have a material  adverse  effect  upon the  Corporation's  existing  or expected
financial condition,  operating results,  assets,  customer relations,  employee
relations, or business prospects taken as a whole.



                                        2

<PAGE>



         3.   Representations  and  Warranties  of  Purchaser.   As  a  material
inducement to the Seller to enter into this  Agreement and sell the Shares,  the
Purchaser hereby represents and warrants to the Seller as follows:

                  3.1  Organization;  Power. The Purchaser is a corporation duly
incorporated and validly existing under the laws of the State of California, and
has all requisite corporate power and authority to enter into this Agreement and
perform its obligations hereunder.

                  3.2 Authorization. The execution, delivery, and performance by
the Purchaser of this Agreement and all other agreements  contemplated hereby to
which the  Purchaser  is a party have been duly and  validly  authorized  by all
necessary  corporate  action of the Purchaser,  and this Agreement and each such
other  agreement,  when  executed  and  delivered by the parties  thereto,  will
constitute the legal, valid, and binding obligation of the Purchaser enforceable
against it in accordance with its terms, except as enforceability may be limited
by applicable bankruptcy,  insolvency, and similar statutes affecting creditors'
rights generally and judicial limits on equitable remedies.

                  3.3 No Conflict  with Other  Instruments  or  Agreements.  The
execution,  delivery, and performance by the Purchaser of this Agreement and all
other agreements  contemplated hereby to which the Purchaser is a party will not
result in a breach or violation of, or constitute a default under,  its Articles
of Incorporation or Bylaws or any material agreement to which the Purchaser is a
party or by which the Purchaser is bound.

                  3.4 Litigation.  There are no actions, suits, proceedings,  or
governmental  investigations  or inquiries  pending or, to the  knowledge of the
Purchaser,   threatened  against  the  Purchaser  or  its  properties,   assets,
operations,  or businesses that might delay, prevent, or hinder the consummation
of this purchase.

                  3.5      Investment Representations.

                  3.5.1 The Purchaser is an "accredited  investor" as defined by
the  SEC's  Rule  501(a),  and  the  Purchaser  has  substantial  experience  in
evaluating  and  investing in private  placement  transactions  of securities in
companies  similar  to the  Corporation  so that the  Purchaser  is  capable  of
evaluating the merits and risks of the Purchaser's investment in the Corporation
and has the capacity to protect the Purchaser's own interests.

                  3.5.2 The Purchaser is acquiring the Shares for investment for
the  Purchaser's own account,  not as a nominee or agent,  and not with the view
to, or for resale in connection  with, any distribution  thereof.  The Purchaser
understands  that the  Shares to be  purchased  have not been,  and will not be,
registered  under  the  Securities  Act or the  securities  laws of any state by
reason  of  a  specific  exemption  from  the  registration  provisions  of  the
Securities Act and the applicable  state  securities  laws, the  availability of
which depends upon,  among other things,  the bona fide nature of the investment
intent and the accuracy of the


                                        3

<PAGE>



Purchaser's  representations as expressed herein. The Purchaser is acquiring the
Shares  without  expectation,  desire,  or need for resale and not with the view
toward distribution, resale, subdivision, or fractionalization of the Shares.

                  3.5.3 During the course of the  negotiation of this Agreement,
the  Purchaser has had an  opportunity  to discuss the  Corporation's  business,
management  and  financial  affairs with the  Corporation's  management  and the
opportunity to review the Corporation's financial statements, books and records,
facilities  and business  plan. The Purchaser has also had an opportunity to ask
questions of officers of the  Corporation,  which questions were answered to the
Purchaser's satisfaction.

                  3.5.4  The  Purchaser   understands  that  the  Shares  to  be
purchased have not been registered under Securities Act of 1933 ("1933 Act"), or
under any state securities law.

                  3.5.5 The  Purchaser  understands  that the  Shares  cannot be
resold in a transaction  to which the 1933 Act and state  securities  laws apply
unless  (i)  subsequently  registered  under the 1933 Act and  applicable  state
securities laws or (ii) exemptions from such  registrations  are available.  The
Purchaser is aware of the provisions of Rule 144 promulgated  under the 1933 Act
which permit limited resale of shares purchased in a private transaction subject
to the satisfaction of certain conditions.

                  3.5.6 The  Purchaser  understands  that no public  market  now
exists for the Shares and that it is  uncertain  that a public  market will ever
exist for the Shares.

                  3.5.7 The Purchaser  understands that the certificates for the
Shares will bear the following legend:

          THIS  CERTIFICATE HAS NOT BEEN REGISTERED  UNDER THE SECURITIES ACT OF
          1933. THE CORPORATION  WILL NOT TRANSFER THIS  CERTIFICATE  UNLESS (i)
          THERE IS AN EFFECTIVE  REGISTRATION COVERING THE SHARES REPRESENTED BY
          THIS  CERTIFICATE  UNDER THE SECURITIES ACT OF 1933 AND ALL APPLICABLE
          STATE  SECURITIES  LAWS,  (ii) IT  FIRST  RECEIVES  A  LETTER  FROM AN
          ATTORNEY,  ACCEPTABLE TO THE BOARD OF DIRECTORS OF THE  CORPORATION OR
          ITS AGENTS,  STATING  THAT IN THE OPINION OF THE ATTORNEY THE PROPOSED
          TRANSFER IS EXEMPT FROM REGISTRATION  UNDER THE SECURITIES ACT OF 1933
          AND UNDER ALL APPLICABLE  STATE SECURITIES LAWS, OR (iii) THE TRANSFER
          IS MADE  PURSUANT  TO RULE 144 UNDER THE  SECURITIES  ACT OF 1933,  AS
          AMENDED.



                                        4

<PAGE>



                  3.6  Tax  Liability.   To  the  extent  the  Purchaser   deems
necessary,  the Purchaser has reviewed with the Purchaser's own tax advisors the
federal,  state,  local and foreign tax  consequences of this investment and the
transactions contemplated by this Agreement. The Purchaser relies solely on such
advisors and not on any  statements or  representations  of the Seller or any of
its agents.  The Purchaser  understands  that the Purchaser (and not the Seller)
shall be responsible  for the  Purchaser's own tax liability that may arise as a
result of this investment or the transactions contemplated by this Agreement.

                  3.7 Disclosure.  To the Purchaser's knowledge, this Agreement,
with the  Exhibits  hereto,  when taken as a whole,  does not contain any untrue
statement  of a  material  fact  concerning  the  Purchaser  or omit to  state a
material fact necessary in order to make the statements concerning the Purchaser
contained herein not misleading in light of the  circumstances  under which they
were made.

                  3.8 Compliance with Other Instruments. The execution, delivery
and  performance  of and  compliance  with this  Agreement,  and the issuance of
shares  will not result in any  material  violation  of, or  conflict  with,  or
constitute a material default under,  any Purchaser's  articles of incorporation
or  bylaws  or any of the  Purchaser's  material  agreements  nor  result in the
creation of any mortgage, pledge, lien, encumbrance or charge against any of the
assets or properties of the Corporation or the Shares.

         4.  Covenants  of Seller.  The  Seller  covenants  and agrees  with the
Purchaser as follows:

                  4.1 Satisfaction of Conditions. The Seller will use reasonable
efforts to obtain as promptly as practicable the  satisfaction of the conditions
to Closing  described in this  Agreement and any  necessary  consents or waivers
under or amendments to agreements by which the Seller is bound.

                  4.2  Supplements to Schedules.  From time to time prior to the
Closing, the Seller will promptly supplement or amend the Exhibits and Schedules
with respect to any matter  hereafter  arising that, if existing or occurring at
the  date of this  Agreement,  would  have  been  required  to be set  forth  or
described in any Exhibit or Schedule and will  promptly  notify the Purchaser of
any  breach  by  either  of  them  that   either  of  them   discovers   of  any
representation, warranty, or covenant contained in this Agreement. No supplement
or  amendment of any Exhibit or Schedule  made  pursuant to this Section will be
deemed to cure any  breach of any  representation  of or  warranty  made in this
Agreement unless the Purchaser specifically agrees thereto in writing; provided,
however,  that if this purchase is closed,  the Purchaser will be deemed to have
waived its rights with respect to any breach of a representation,  warranty,  or
covenant or any  supplement to any Schedule of which it shall have been notified
pursuant to this Subsection.



                                        5

<PAGE>



                  4.3 No Solicitation. Until the Closing or termination pursuant
to  Section  9 of this  Agreement,  the  Seller  shall not  encourage,  solicit,
initiate,  or  enter  into  any  discussions  or  negotiations   concerning  any
disposition  of any of the capital  stock of Seller (other than pursuant to this
Agreement),  or any  proposal  therefor.  The Seller  will  promptly  inform the
Purchaser of any inquiry (including the terms thereof and the person making such
inquiry)  received  by the Seller  after the date  hereof and  believed  by such
person to be a bona fide, serious inquiry relating to any such proposal.

         5.  Covenant of Purchaser.  The Purchaser  will use its best efforts to
cause the conditions set forth in Section 7 to be satisfied.

         6. Conditions Precedent to the Obligations of Purchaser; Legal Opinion.
Each and every  obligation of the Purchaser  under this  Agreement is subject to
the delivery,  at or within seven (7) days following the Closing,  of an opinion
of Seller's outside corporate counsel, in form and content reasonably acceptable
to the Purchaser and its legal  counsel,  to the effect that (i) this  Agreement
has been duly  executed and  delivered by Seller;  (ii) this  Agreement and each
other agreement  contemplated hereby, when executed and delivered by the parties
thereto, will constitute the legal, valid, and binding obligation of the Seller,
enforceable  against  the  Seller in  accordance  with its  terms  except as the
enforceability  thereof  may  be  limited  by  the  application  of  bankruptcy,
insolvency,  moratorium,  or similar  laws  affecting  the  rights of  creditors
generally  or judicial  limits on the right of specific  performance;  and (iii)
except as set forth in Schedule 6, the  execution  and delivery by the Seller of
this Agreement and all other agreements  contemplated hereby to which the Seller
is a party, the offering and sale of the Shares hereunder and the fulfillment of
and compliance  with the respective  terms hereof and thereof by the Seller,  do
not and  will  not (a)  conflict  with  or  result  in a  breach  of the  terms,
conditions or provisions of, (b)  constitute a default under,  (c) result in the
creation of any lien, security interest, charge, or encumbrance upon the capital
stock or assets of the Seller,  (d) give any third party the right to accelerate
any  obligation  under,  (e)  result  in a  violation  of,  or (f)  require  any
authorization, consent, approval, exemption, or other action by or notice to any
court or  administrative  or governmental  body, or any law,  statute,  rule, or
regulation to which the Seller is subject, or any agreement,  instrument, order,
judgment,  or decree to which the Seller is subject;  and (iv) to such counsel's
knowledge, Seller owns the rights to the Shares.

         7. Conditions  Precedent to the  Obligations of Seller.  Each and every
obligation of the Seller under this Agreement is subject to the satisfaction, at
or before the Closing, of each of the following conditions:

                  7.1 Representations and Warranties;  Performance.  Each of the
representations  and  warranties  made by the Purchaser  herein will be true and
correct in all  material  respects  as of the  Closing  with the same  effect as
though made at that time except for changes contemplated, permitted, or required
by this  Agreement;  the  Purchaser  will have  performed  and complied with all
agreements, covenants, and conditions required by this Agreement to be performed
and complied with by it prior to the Closing; and the Seller will have received,
at the Closing, a


                                        6

<PAGE>



certificate of the  Purchaser,  signed by the President and the Secretary or the
Chief   Financial   Officer  of  the   Purchaser,   stating  that  each  of  the
representations  and warranties made by the Purchaser herein is true and correct
in all  material  respects  as of the Closing  except for changes  contemplated,
permitted,  or required by this  Agreement  and that the Purchaser has performed
and complied with all  agreements,  covenants,  and conditions  required by this
Agreement to be performed and complied with by it prior to the Closing.

                  7.2 Corporate Action. The Purchaser will have furnished to the
Seller a copy,  certified  by the  Secretary  of an  Assistant  Secretary of the
Purchaser,  of the  resolutions  of the  Purchaser  authorizing  the  execution,
delivery, and performance of this Agreement.

         8.       Closing.

                  8.1 Time, Place, and Manner of Closing.  Unless this Agreement
has  been  terminated  and this  purchase  has been  abandoned  pursuant  to the
provisions of Section 9, the closing  ("Closing") will be held at the offices of
Stein Perlman & Hawk,  or such other place as the parties may agree,  on January
12,  1998,  or as soon as  practicable  after the  satisfaction  of the  various
conditions precedent to the Closing set forth herein. At the Closing the parties
to this Agreement will exchange  certificates,  Notes, and other instruments and
documents  in order to  determine  whether  the  terms  and  conditions  of this
Agreement have been  satisfied.  Upon the  determination  of each party that its
conditions to consummate this purchase have been satisfied or waived, the Seller
shall deliver to the Purchaser the  certificate(s)  evidencing the Shares,  duly
endorsed for transfer,  and the  Purchaser  shall deliver to the Seller the Note
referred to in Section 1.3, in a manner to be agreed upon by the parties.  After
the Closing,  the Seller,  at the Purchaser's cost, will execute,  deliver,  and
acknowledge  all such further  instruments  of transfer and  conveyance and will
perform  all  such  other  acts  as the  Purchaser  may  reasonably  request  to
effectively transfer the Shares.

                  8.2  Consummation  of  Closing.  All  acts,  deliveries,   and
confirmations  comprising the Closing regardless of chronological sequence shall
be deemed to occur  contemporaneously  and simultaneously upon the occurrence of
the last act,  delivery,  or  confirmation of the Closing and none of such acts,
deliveries, or confirmations shall be effective unless and until the last of the
same  shall  have  occurred.  The  time of the  Closing  has been  scheduled  to
correspond with the close of business at the principal office of the Corporation
and,  regardless of when the last act, delivery,  or confirmation of the Closing
shall take place,  the transfer of the Shares shall be deemed to occur as of the
close of business at the principal  office of the Corporation on the date of the
Closing.

         9.       Termination.

                  9.1 Termination  for Cause.  If, pursuant to the provisions of
Section 6 or 7 of this  Agreement,  the Seller or the Purchaser is not obligated
at the  Closing  to  consummate  this  Agreement,  then the  party who is not so
obligated may terminate this Agreement.


                                        7

<PAGE>



                  9.2 Termination Without Cause. Anything herein or elsewhere to
the contrary notwithstanding,  this Agreement may be terminated and abandoned at
any time  without  further  obligation  or liability on the part of any party in
favor of any other by mutual consent of the Purchaser and the Seller.

                  9.3  Termination  Procedure.  Any  party  having  the right to
terminate this Agreement due to a failure of a condition  precedent contained in
Sections 6 or 7 hereto may terminate  this  Agreement by delivering to the other
party written  notice of  termination,  and  thereupon,  this  Agreement will be
terminated without obligation or liability of any party.

         10.      Miscellaneous Provisions.

                  10.1 Amendment and  Modification.  Subject to applicable  law,
this  Agreement  may be amended,  modified,  or  supplemented  only by a written
agreement signed by the Purchaser and the Seller.

                  10.2     Waiver of Compliance; Consents

                  10.2.1 Any failure of any party to comply with any obligation,
covenant,  agreement, or condition herein may be waived by the party entitled to
the  performance  of such  obligation,  covenant,  or  agreement  or who has the
benefit of such  condition,  but such  waiver or failure to insist  upon  strict
compliance  with such  obligation,  covenant,  agreement,  or condition will not
operate as a waiver of, or estoppel  with  respect to, any  subsequent  or other
failure.

                  10.2.2 Whenever this Agreement  requires or permits consent by
or on  behalf  of any  party  hereto,  such  consent  will be  given in a manner
consistent with the requirements for a waiver of compliance as set forth above.

                  10.3  Payment  of  Fees  and  Expenses.  Each  party  to  this
Agreement  will be  responsible  for,  and  will  pay,  all of its own  fees and
expenses,  including those for its own counsel and accountants,  incurred in the
negotiation,  preparation,  and  consumption of this Agreement and this purchase
and sale.

                  10.4 Costs.  Each party hereto shall bear,  pay and  discharge
all of his/its respective expenses incurred in connection with the execution and
performance of this Agreement, except as otherwise provided specifically herein.

                  10.5 Entire Agreement;  Successors and Assigns; and Amendment;
Third  Parties.   Except  for  that  certain  Voting  Trust  Agreement  executed
concurrently  herewith and appended  hereto as Exhibit A and the Purchase Rights
Agreement executed  concurrently herewith and appended hereto as Exhibit B, this
Agreement  and the exhibits  appended  hereto  constitute  the entire  agreement
between the parties  concerning  the subject matter hereof and no party shall be
liable or bound to the other in any manner by any warranties, representations or


                                        8

<PAGE>



covenants  except as specifically  set forth herein.  Any previous or concurrent
agreement  among the  parties  with  respect  to the  subject  matter  hereof is
superseded by this  Agreement and the exhibits  appended  hereto.  The terms and
conditions of this  Agreement  shall inure to the benefit of and be binding upon
the respective executors,  administrators,  heirs, successors and assigns of the
parties. Except as expressly provided herein, nothing in this Agreement, express
or implied, is intended to confer upon any party, other than the parties hereto,
any rights,  remedies,  obligations  or  liabilities  under or by reason of this
Agreement.

                  10.6 Governing Law and Consent to Jurisdiction. This Agreement
shall be governed by and construed in  accordance  with the laws of the State of
California.  The parties irrevocably (i) submit to the exclusive jurisdiction of
the state  courts  of the  State of  California  over any  action or  proceeding
arising out of a breach of this Agreement, (ii) agree that all claims in respect
of such action or proceeding may be heard and  determined in such courts,  (iii)
waive,  to the  fullest  extent  they may  effectively  do so, the defense of an
inconvenient  or  inappropriate  forum  to the  maintenance  of such  action  or
proceeding,  (iv) agree that any communication  given in accordance with Section
10.9,  to the fullest  extent  permitted  by law,  shall be taken and held to be
valid personal service and personal  delivery to such party for the purposes set
forth in this  Section,  and (v) waive  any  defense  based on lack of  personal
jurisdiction for any such purpose.

                  10.7 Legal Action and Fees.  In the event of any  controversy,
claim or dispute  between the parties  hereto arising out of or relating to this
Agreement,  the  prevailing  party  shall  be  entitled  to  recovery  from  the
non-prevailing party its reasonable  expenses,  including but not limited to its
reasonable attorneys' fees.

                  10.8 Headings.  The headings of the sections of this Agreement
are for  convenience  only and shall not  determine the  interpretation  of this
Agreement.

                  10.9 Notices. Any notice required or permitted hereunder shall
be given in  writing  and  shall  be  deemed  effectively  given  upon  personal
delivery, 24 hours after transmission by telecopy, telex, or five (5) days after
deposit in the United States mail by registered or certified mail,  addressed as
set forth below or at such other address as such party may designate by ten (10)
days' advance written notice to the other party:

                       If to Seller:        Medical Biology Institute
                                            11077 North Torrey Pines Road
                                            La Jolla, California 92037
                                            Attention: President

                       If to Purchaser:     HealthMed, Inc.
                                            8306 Wilshire Boulevard, Suite 7056
                                            Beverly Hills, California 90211
                                            Attention: President



                                        9

<PAGE>



                  10.10  Counterparts.  This Agreement may be executed in two or
more counterparts,  each of which shall be deemed an original,  but all of which
together shall constitute one and the same instrument.

                  10.11 Other  Documents.  Seller  shall,  at any time after the
Closing  and upon the  request  of the  Purchaser,  execute  and  deliver to the
Purchaser such documents or instruments of conveyance,  license or assignment or
take such other  action as is  reasonably  necessary to complete the transfer of
the Shares or other  transactions  contemplated  by this Agreement or to perfect
the interest of the Purchaser  therein.  Further,  the parties agree to take all
actions and file such documents  required to comply with  California  securities
laws.

                  10.12 Legal Advice.  The parties hereby  acknowledge that they
have  received  independent  legal  advice from  attorneys  of their choice with
respect  to the  advisability  of  executing  this  Agreement  and  the  related
documents affecting this transaction.  Prior to the execution of this Agreement,
each of the  parties'  attorneys  reviewed  this  Agreement  and  discussed  the
Agreement with such party, and each party made all desired changes.  Each of the
parties and their attorneys have made such investigation of the facts pertaining
to this  Agreement  and all of the matters  appertaining  thereto as they deemed
necessary.  Each of the parties  certifies that it has read this Agreement,  and
fully  understands this Agreement and that it has executed it voluntarily,  free
of any duress, force or undue influence of any party or any person.

         IN WITNESS  WHEREOF,  the parties  hereto have executed this  Agreement
effective as of the date first set forth above.

                                           SELLER:

                                           MEDICAL BIOLOGY INSTITUTE



                                           By:______________________________
                                               David Katz, M.D.
                                               Its: President



                                           By:______________________________
                                               Christopher S. McKellar
                                               Its: Chairman of the Board

                                           PURCHASER:

                                           HEALTHMED, INC.


                                       10

<PAGE>





                                           By:_________________________________
                                               Mitchell J. Stein
                                               Its: President & Secretary



                                       11

<PAGE>



                                  EXHIBITS 1.3




                                       12

<PAGE>



                                    EXHIBIT A




                                       13

<PAGE>


                                    EXHIBIT B




                                       14



                             VOTING TRUST AGREEMENT


         THIS VOTING TRUST AGREEMENT  ("Agreement")  is made and entered into as
of January  12,  1998,  by and between  David Katz,  M.D.,  an  individual  (the
"Shareholder") and HealthMed, Inc., a Nevada corporation ("Trustee").

         This  Agreement  is made  with  reference  to the  following  facts and
circumstances:

         A. The authorized capital stock of LIDAK Pharmaceuticals,  a California
corporation (the "Company"), consists of (i) 99,490,000, no par value per share,
Class A common shares, of which 38,613,799 are issued and outstanding,  and such
shares set forth on Schedule 1 have been issued to the Shareholder (the "Class A
Shares");  and (ii) 510,000,  no par value per share,  Class B common shares, of
which 283,000 are issued and outstanding,  and such shares set forth on Schedule
1 have been issued to the Shareholder (the "Class B Shares") (the Class A Shares
and the Class B Shares  shall  hereinafter  be  collectively  referred to as the
"Shares").

         B. The Shareholder wishes to transfer the Shares to Trustee in order to
provide  Trustee the full and exclusive power to vote the shares of common stock
of the Company in  accordance  with the  Company's  business  plan, to elect the
Company's Board of Directors, to manage the Company and to otherwise provide for
the smooth and efficient operation of the Company.

         NOW,  THEREFORE,  in  consideration  of the  covenants  and  conditions
contained  herein,  and for other  valuable  consideration,  including,  without
limitation (a) the extensive  services  Trustee has  heretofore  provided to the
Shareholder,  including,  without  limitation,  substantial  business consulting
services  appertaining  or relating to the  protection and  maximization  of the
value of the  Shareholder's  equity  interests,  potential  equity interests and
prospective equity interests in the Company, including assisting the Shareholder
in the development of  comprehensive  plans that are believed by Trustee and the
Shareholder  to be  highly  likely to lead to the  creation  of  compelling  new
opportunities  for the  Company  and the  Shareholder,  and (b) as  specifically
requested  of  Trustee  by  the  Shareholder,  and  hereby  acknowledged  by the
Shareholder,  the  extensive  services  the  Trustee is expected to use its best
efforts to provide in the future, in furtherance of the goals of both protecting
and  maximizing  the  equity  interests  of all  shareholders  of  the  Company,
including that of the Shareholder, the parties hereby agree as follows:

         1.  TRUSTEE.  HealthMed,  Inc. is hereby  appointed  as Trustee for the
purposes set forth in and with the powers granted to him by this Agreement,  and
Trustee hereby accepts such appointment and agrees to act as Trustee hereunder.

         2. TERM OF VOTING TRUST.  For a period of ten (10) years  following the
date of this  Agreement,  all of the Shares owned by the  Shareholder  as of the
date of this Agreement, together with such other Shares that the Shareholder may
purchase or receive from any source


                                        1

<PAGE>



whatsoever  during the term of this Agreement,  including but not limited to any
Shares  received as a consequence  of any event  described in Paragraph 3 below,
shall be subject to the  provisions  of this  Agreement  (the  "Voting  Trust").
During said ten (10) year period, the Voting Trust shall be irrevocable,  except
as otherwise  provided by this  Agreement or by the failure to cure a default of
the  promissory  note appended  hereto as Exhibit A (the "Note") and executed in
connection  with a Stock  Purchase  Agreement  dated of even date  herewith  and
appended  hereto as Exhibit B.  Within two (2) years of the  expiration  of this
Agreement,  the parties may mutually  agree to extend the term of the  Agreement
for an additional ten (10) year period.

         3. ASSIGNMENT OF STOCK TO TRUSTEE.  The Shareholder  hereby  transfers,
assigns and delivers to and deposits with Trustee all of the Shares now owned or
held by him. The Shareholder  agrees to deliver to Trustee  immediately upon the
execution of this Agreement all  certificates  evidencing  such Shares  properly
endorsed for transfer to Trustee.  All certificates of Shares transferred to the
Trustee by the Shareholder  shall be surrendered to and canceled by the Company,
and the  Company  shall issue a new  certificate  to the  Trustee,  and it shall
appear  upon the  certificate  so  issued  that it is  issued  pursuant  to this
Agreement.  An entry shall be made in the proper  books of the Company  that the
Trustee is the registered owner of such Shares pursuant to this Agreement, and a
duplicate of this Agreement shall be filed with the Secretary of the Company and
shall, at all times during the term hereof (including any extension(s)  hereof),
be open to inspection by any Shareholder or such  Shareholder's  attorney.  Upon
receipt by the Company of the Shareholder's  Share  certificates and transfer of
the same into the name of the Trustee,  the Trustee shall hold the  certificates
issued in its name  pursuant  to the terms of this  Agreement,  and the  Company
shall thereupon issue and deliver to the Shareholder a Voting Trust Certificate,
representing the Shareholder's  beneficial interest in the trust herein created,
substantially  in the form of Schedules 2 and 3 attached hereto and incorporated
herein by this  reference.  If at any time  during the  existence  of the Voting
Trust,  other or additional Shares are issued by the Company to the Shareholder,
including,  without  limitation,  through  the  exercise  of  stock  options  or
warrants,  or any securities issued in respect of or in exchange for all or part
of any Shares owned by the Shareholder or held by Trustee  pursuant to the terms
of  this   Agreement,   as  a   consequence   of  any  merger,   reorganization,
recapitalization,  reclassification,  readjustment, stock split, stock dividend,
or other change in the  Company's  capital  structure,  such other or additional
securities likewise immediately shall be assigned,  transferred and delivered to
and  deposited  with Trustee to be held subject to the terms of this  Agreement.
All of such shares now or  hereafter so  transferred,  assigned,  delivered  and
deposited shall be held by Trustee in trust for the uses and purposes herein set
forth, and such shares hereinafter will be referred to as the "Shares."

         4. POWERS OF TRUSTEE. During the existence of the Voting Trust, Trustee
shall possess and exercise all rights and powers inuring to such Shares as if it
were the absolute owner and holder of the Shares.

         5. TRUSTEE MAY BE INTERESTED PERSONALLY.  Trustee's agents may serve as
director, officer, employee or consultant of the Company, and Trustee may be the
owner


                                        2

<PAGE>



of shares of common  stock of the  Company  at any time  during the term of this
Agreement  with the same  rights as he or it would have had if he or it were not
an agent of the Trustee or a Trustee hereunder,  respectively, and, irrespective
of  whether  such  Trustee  is an owner of any  shares  of  common  stock of the
Company,  may vote or cause  votes  to be cast in favor of its  agent's(s')  own
election,  appointment  or employment  as such  director,  officer,  employee or
consultant.

         6.   COMPENSATION  OF  TRUSTEE.   Trustee  shall  not  be  entitled  to
compensation for its services as Trustee hereunder.

         7. LIABILITY OF TRUSTEE; INDEMNITY. Trustee shall not be liable for any
error of judgment nor for any act of commission or omission, nor for any mistake
of law or fact,  nor for anything it may do or refrain from doing in good faith,
nor generally  shall it have any  accountability  hereunder,  except for its own
willful  misconduct  or gross  negligence.  The  Shareholder  hereby  agrees  to
indemnify  and defend  Trustee  from and against  any and all  claims,  demands,
losses,  costs,  and expenses,  including but not limited to attorneys' fees and
costs paid or incurred  by Trustee,  and any and all  liability  therefor,  that
Trustee may sustain or incur in  connection  with any action taken in accordance
with the provisions of this Agreement, except for matters arising from Trustee's
own willful  misconduct or gross negligence.  Trustee hereby agrees to indemnify
and defend the Shareholder from and against any and all claims, demands, losses,
costs, and expenses, including but not limited to attorneys' fees and costs paid
or incurred by the  Shareholder,  and any and all liability  therefor,  that the
Shareholder  may  sustain  or  incur in  connection  with  any  action  taken in
accordance  with the provisions of this  Agreement,  except for matters  arising
from the Shareholder's own willful misconduct or gross negligence.

         8. TRANSACTIONS BY SHAREHOLDER.  During the term of this Agreement, the
Shareholder  shall  not have the right nor  shall he  attempt  to sell,  assign,
hypothecate,  encumber or transfer or in any other manner  dispose of any of the
Shares or any interest  therein,  including  but not limited to the Voting Trust
Certificate(s) representing such Shares; provided, however, that the Shareholder
may publicly sell Shares in the public market upon the following conditions: (i)
the Shareholder shall provide written notice to the Trustee at least twenty-four
(24) hours prior to any sale of the Shares,  and (ii) the number of Shares to be
sold by the  Shareholder  in any thirty (30) day period shall not exceed  twenty
percent (20%) of the number of Shares deposited by the Shareholder in this trust
pursuant to the terms of this  Agreement.  Upon the sale of the Shares as herein
provided the  certificates  representing the Shares sold hereby and in the hands
of Trustee shall be assigned to the Shareholder or purchaser of the Shares.

         9. FILING OF COPY OF AGREEMENT  WITH THE COMPANY.  An executed  copy of
this  Agreement  shall be filed in the office of the  Company  and be subject to
inspection by all the shareholders of the Company.

         10.  TERMINATION AND  IRREVOCABILITY  OF TRUST.  The Voting Trust shall
terminate  upon  the  first  to  occur  of the  following  events:  (i) upon the
expiration of its ten (10)


                                        3

<PAGE>



year term,  unless  extended,  as provided by Section 2 of this Agreement,  (ii)
upon the written consent of Trustee and Shareholder, (iii) an uncured default on
the Note, (iv) in the event of the  resignation of Trustee,  or (v) the death of
Mitchell J. Stein, the presently qualified and acting President of Trustee. Upon
the  termination of the Voting Trust the  certificates  representing  all of the
Shares  held under this  Agreement  and then  remaining  in the hands of Trustee
shall be assigned to the Shareholder then entitled thereto.

         11.      MISCELLANEOUS.

                  (a)  Notices.  Any notices  which any party is required or may
desire to give to any other party or parties  under this  Agreement  shall be in
writing,  and  shall be  given by  addressing  the same to such  other  party or
parties  at the  address(es)  set forth  below,  and by  depositing  the same so
addressed,  postage prepaid,  certified mail, return receipt  requested,  in the
United  States mail, by  delivering  the same  personally to such other party or
parties or by  electronic  facsimile.  A party may change  the  address  for the
service of notice by  written  notice  given to the other  parties in the manner
herein provided.

                           If to Shareholder:

                           David Katz, M.D.
                           1775 La Jolla Rancho Road
                           La Jolla, California 92037
                           Facsimile: (619) 454-9054

                           If to Trustee:

                           HeatlhMed, Inc.
                           8306 Wilshire Boulevard, Suite 7056
                           Beverly Hills, California 90211
                           Facsimile: (310) 652-0405

                  (b)      Parties in Interest; Assignment.

                          (i)   Neither   this   Agreement   nor   any   of  the
Shareholder's  or  Trustee's  rights  hereunder  shall be assigned by such party
without the prior  written  consent of the other party,  except that Trustee may
assign its rights and obligations  hereunder to an entity to be formed or caused
to be formed by Trustee.

                          (ii) Subject to the  conditions  on  assignment,  this
Agreement and all the  provisions  hereof shall be binding upon and inure to the
benefit of the parties  hereto and their  respective  successors  and  permitted
assigns.



                                        4

<PAGE>



                  (c) No Third Party Beneficiaries.  Nothing herein expressed or
implied is intended or shall be  construed  to confer upon or give to any person
or  entity,  whatsoever,  other  than the  parties  hereto  and their  permitted
successors  or  assigns,  any  rights  or  remedies  under or by  reason of this
Agreement.

                  (d)  Counterparts.  This  Agreement  may be executed in two or
more  counterparts  each of which shall be deemed an original,  but all of which
together shall constitute one and the same instrument.

                  (e)  Validity  and   Severability.   The  provisions  of  this
Agreement are severable and if any provision,  clause, sentence, section or part
thereof is held to be illegal, invalid,  unconstitutional or inapplicable to any
person or circumstance,  such  illegality,  invalidity,  unconstitutionality  or
inapplicability  shall not affect or impair any of the  remaining  provision(s),
sentence(s),  clause(s), section(s) or part(s) of the Agreement, Trustee, or the
Shareholder  or to other persons or  circumstances.  It is understood and agreed
that the terms,  conditions,  and  covenants of this  Agreement  would have been
made,  entered into and this Agreement  executed by all parties if such illegal,
invalid or unconstitutional  provisions,  sentences,  clauses, sections or parts
had not been  included  therein.  To the  extent  that a portion or part of this
Agreement may be invalid, but may be made valid by the striking of certain words
or  phrases,  such  words or  phrases  shall be  deemed to be  stricken  and the
remainder of the other portions of this Agreement shall remain in full force and
effect.

                  (f)  Governing  Law.  This  Agreement  shall be construed  and
governed  by the  laws  of the  State  of  California  and  the  invalidity  and
unenforceability  of any  provision  hereof  shall not  affect the  validity  or
enforceability  of any  other  provision.  The  parties  hereby  consent  to the
jurisdiction of the federal and state courts located in either the county of Los
Angeles or San Diego,  California,  for any action or suit  arising  out of this
Agreement,  and waive  any  defense  to such  jurisdiction,  including,  without
limitation, any defense based on venue or inconvenient forum.

                  (g)  Headings.  The  headings  herein are for  convenience  of
reference  only and shall not control or affect the meaning or  construction  of
any provisions hereof.

                  (h) Entire Agreement,  Amendments and Waiver.  This Agreement,
recitals,  Schedules,  any amendments hereto or thereto,  and the other writings
referred to herein or therein or delivered pursuant hereto or thereto which form
a part hereof or thereof  contain the entire  understanding  of the parties with
respect to the  subject  matter  hereof.  This  Agreement  supersedes  all prior
agreements  and  understandings  between the parties with respect to its subject
matter. This Agreement may be amended only by a written instrument duly executed
by all of the parties hereto. Any condition to a party's  obligations  hereunder
may be waived in writing by such party to the extent permitted by law.



                                        5

<PAGE>



                  (i)  Specific   Performance.   The   Shareholder  and  Trustee
acknowledge that, in view of the uniqueness of the Company's  business,  a party
hereto would not have an adequate  remedy at law for money  damages in the event
the other party breached any of the terms of this Agreement and, therefore,  the
parties agree that each party shall be entitled to specific  enforcement against
the other  party for  performance  of the terms  hereof in addition to any other
remedy to which it may be entitled  at law or in equity,  and in any such action
or proceeding the responding  party(ies) will not raise or tender any defense to
the effect that the petitioning party has an adequate remedy at law.

         IN WITNESS WHEREOF,  the undersigned have executed this Agreement as of
the date first written above.

                                  "SHAREHOLDER"



                                  ------------------------------------------
                                  DAVID KATZ, M.D.


                                    "TRUSTEE"

                                    HEALTHMED, INC.



                                    By:
                                        Mitchell J. Stein
                                        Its: President & Secretary





                                        6

<PAGE>



                                   SCHEDULE 1

                                   Shareholder

                                                 No. Shares of Stock Deposited

         DAVID KATZ, M.D.                           718,903 Class A Shares

         DAVID KATZ, M.D.                           163,800 Class B Shares





                                        7

<PAGE>



                                   SCHEDULE 2

                            Voting Trust Certificate


No. 001                                        718,903 Shares of Class A Stock


                              LIDAK PHARMACEUTICALS
                            VOTING TRUST CERTIFICATE


         This is to certify  that David Katz,  M.D.  ("Certificate  Holder") has
transferred  to the  person  now and  hereafter  listed as voting  trustee  (the
"Trustee") on the signature page of that certain Voting Trust  Agreement,  dated
January 12, 1998, or any extension  thereof (the "Voting Trust  Agreement")  the
above-stated  number of shares of stock of LIDAK  Pharmaceuticals,  a California
corporation ("Corporation"),  to be held by the Trustee pursuant to the terms of
the Voting Trust Agreement.  The Certificate  Holder,  or his/her/its  permitted
successor or  successors-in-interest,  is entitled to all of the rights accorded
the Certificate Holder under the terms of the Voting Trust Agreement.

         THE SALE,  ASSIGNMENT,  HYPOTHECATION,  ENCUMBRANCE OR TRANSFER OF THIS
VOTING TRUST CERTIFICATE IS RESTRICTED BY THE VOTING TRUST AGREEMENT,  A COPY OF
WHICH HAS BEEN FILED WITH THE SECRETARY OF CORPORATION.

         Dated as of January 12, 1998.
                                        VOTING TRUSTEE:

                                        HEALTHMED, INC.



                                        By:_________________________________
                                           Mitchell J. Stein
                                           Its: President & Secretary


Signature                                 No. Shares of Class A Stock Deposited


____________________________                             718,903
DAVID KATZ, M.D.


                                        8

<PAGE>



                                   SCHEDULE 3

                            Voting Trust Certificate


No. 001                                        163,800 Shares of Class B Stock


                              LIDAK PHARMACEUTICALS
                            VOTING TRUST CERTIFICATE


         This is to certify  that David Katz,  M.D.  ("Certificate  Holder") has
transferred  to the  person  now and  hereafter  listed as voting  trustee  (the
"Trustee") on the signature page of that certain Voting Trust  Agreement,  dated
January 12, 1998, or any extension  thereof (the "Voting Trust  Agreement")  the
above-stated  number of shares of stock of LIDAK  Pharmaceuticals,  a California
corporation ("Corporation"),  to be held by the Trustee pursuant to the terms of
the Voting Trust Agreement.  The Certificate  Holder,  or his/her/its  permitted
successor or  successors-in-interest,  is entitled to all of the rights accorded
the Certificate Holder under the terms of the Voting Trust Agreement.

         THE SALE,  ASSIGNMENT,  HYPOTHECATION,  ENCUMBRANCE OR TRANSFER OF THIS
VOTING TRUST CERTIFICATE IS RESTRICTED BY THE VOTING TRUST AGREEMENT,  A COPY OF
WHICH HAS BEEN FILED WITH THE SECRETARY OF CORPORATION.

         Dated as of January 12, 1998.
                                      VOTING TRUSTEE:

                                      HEALTHMED, INC.



                                      By:_________________________________
                                         Mitchell J. Stein
                                         Its: President & Secretary


Signature                              No. Shares of Class B Stock Deposited


____________________________                           163,800
DAVID KATZ, M.D.


                                        9

<PAGE>



                CONSENT OF SPOUSE, COHABITANT OR DOMESTIC PARTNER

     The undersigned  spouse,  cohabitant or domestic partner of the Shareholder
acknowledges on her behalf that: I have read the foregoing  Agreement and I know
its contents.  I am aware that by its provisions  that my spouse,  cohabitant or
domestic  partner will  deposit his Shares in the Company  with the  Trustee.  I
hereby consent to and approve of the provisions of the Agreement, and agree that
those  Shares  and my  interest  in them are  subject to the  provisions  of the
Agreement and that I will take no action at any time to hinder  operation of the
Agreement on those Shares or my interest in them.



Signature:__________________________________

Print Name:____________________________




                                       10

<PAGE>



                                    EXHIBIT A




                                       11

<PAGE>


                                    EXHIBIT B




                                       12


                             VOTING TRUST AGREEMENT


         THIS VOTING TRUST AGREEMENT  ("Agreement")  is made and entered into as
of January 12, 1998,  by and between  Medical  Biology  Institute,  a California
nonprofit public benefit corporation (the "Shareholder") and HealthMed,  Inc., a
Nevada corporation ("Trustee").

         This  Agreement  is made  with  reference  to the  following  facts and
circumstances:

         A. The authorized capital stock of LIDAK Pharmaceuticals,  a California
corporation (the "Company"), consists of (i) 99,490,000, no par value per share,
Class A common shares, of which 38,613,799 are issued and outstanding,  and such
shares set forth on Schedule 1 have been issued to the Shareholder (the "Class A
Shares");  and (ii) 510,000,  no par value per share,  Class B common shares, of
which 283,000 are issued and outstanding,  and such shares set forth on Schedule
1 have been issued to the Shareholder (the "Class B Shares") (the Class A Shares
and the Class B Shares  shall  hereinafter  be  collectively  referred to as the
"Shares").

         B. The Shareholder wishes to transfer the Shares to Trustee in order to
provide  Trustee the full and exclusive power to vote the shares of common stock
of the Company in  accordance  with the  Company's  business  plan, to elect the
Company's Board of Directors, to manage the Company and to otherwise provide for
the smooth and efficient operation of the Company.

         NOW,  THEREFORE,  in  consideration  of the  covenants  and  conditions
contained  herein,  and for other  valuable  consideration,  including,  without
limitation (a) the extensive  services  Trustee has  heretofore  provided to the
Shareholder,  including,  without  limitation,  substantial  business consulting
services  appertaining  or relating to the  protection and  maximization  of the
value of the  Shareholder's  equity  interests,  potential  equity interests and
prospective equity interests in the Company, including assisting the Shareholder
in the development of  comprehensive  plans that are believed by Trustee and the
Shareholder  to be  highly  likely to lead to the  creation  of  compelling  new
opportunities  for the  Company  and the  Shareholder,  and (b) as  specifically
requested  of  Trustee  by  the  Shareholder,  and  hereby  acknowledged  by the
Shareholder,  the  extensive  services  the  Trustee is expected to use its best
efforts to provide in the future, in furtherance of the goals of both protecting
and  maximizing  the  equity  interests  of all  shareholders  of  the  Company,
including that of the Shareholder, the parties hereby agree as follows:

         1.  TRUSTEE.  HealthMed,  Inc. is hereby  appointed  as Trustee for the
purposes set forth in and with the powers granted to him by this Agreement,  and
Trustee hereby accepts such appointment and agrees to act as Trustee hereunder.

         2. TERM OF VOTING TRUST.  For a period of ten (10) years  following the
date of this  Agreement,  all of the Shares owned by the  Shareholder  as of the
date of this Agreement, together with such other Shares that the Shareholder may
purchase or receive from any source


                                        1

<PAGE>



whatsoever  during the term of this Agreement,  including but not limited to any
Shares  received as a consequence  of any event  described in Paragraph 3 below,
shall be subject to the  provisions  of this  Agreement  (the  "Voting  Trust").
During said ten (10) year period, the Voting Trust shall be irrevocable,  except
as otherwise  provided by this  Agreement or by the failure to cure a default of
the  promissory  note appended  hereto as Exhibit A (the "Note") and executed in
connection  with a Stock  Purchase  Agreement  dated of even date  herewith  and
appended  hereto as Exhibit B.  Within two (2) years of the  expiration  of this
Agreement,  the parties may mutually  agree to extend the term of the  Agreement
for an additional ten (10) year period.

         3. ASSIGNMENT OF STOCK TO TRUSTEE.  The Shareholder  hereby  transfers,
assigns and delivers to and deposits with Trustee all of the Shares now owned or
held by it. The Shareholder  agrees to deliver to Trustee  immediately  upon the
execution of this Agreement all  certificates  evidencing  such Shares  properly
endorsed for transfer to Trustee.  All certificates of Shares transferred to the
Trustee by the Shareholder  shall be surrendered to and canceled by the Company,
and the  Company  shall issue a new  certificate  to the  Trustee,  and it shall
appear  upon the  certificate  so  issued  that it is  issued  pursuant  to this
Agreement.  An entry shall be made in the proper  books of the Company  that the
Trustee is the registered owner of such Shares pursuant to this Agreement, and a
duplicate of this Agreement shall be filed with the Secretary of the Company and
shall, at all times during the term hereof (including any extension(s)  hereof),
be open to inspection by any Shareholder or such  Shareholder's  attorney.  Upon
receipt by the Company of the Shareholder's  Share  certificates and transfer of
the same into the name of the Trustee,  the Trustee shall hold the  certificates
issued in its name  pursuant  to the terms of this  Agreement,  and the  Company
shall thereupon issue and deliver to the Shareholder a Voting Trust Certificate,
representing the Shareholder's  beneficial interest in the trust herein created,
substantially  in the form of Schedules 2 and 3 attached hereto and incorporated
herein by this  reference.  If at any time  during the  existence  of the Voting
Trust,  other or additional Shares are issued by the Company to the Shareholder,
including,  without  limitation,  through  the  exercise  of  stock  options  or
warrants,  or any securities issued in respect of or in exchange for all or part
of any Shares owned by the Shareholder or held by Trustee  pursuant to the terms
of  this   Agreement,   as  a   consequence   of  any  merger,   reorganization,
recapitalization,  reclassification,  readjustment, stock split, stock dividend,
or other change in the  Company's  capital  structure,  such other or additional
securities likewise immediately shall be assigned,  transferred and delivered to
and  deposited  with Trustee to be held subject to the terms of this  Agreement.
All of such shares now or  hereafter so  transferred,  assigned,  delivered  and
deposited shall be held by Trustee in trust for the uses and purposes herein set
forth, and such shares hereinafter will be referred to as the "Shares."

         4. POWERS OF TRUSTEE. During the existence of the Voting Trust, Trustee
shall possess and exercise all rights and powers inuring to such Shares as if it
were the absolute owner and holder of the Shares.



                                        2

<PAGE>



         5. TRUSTEE MAY BE INTERESTED PERSONALLY.  Trustee's agents may serve as
director, officer, employee or consultant of the Company, and Trustee may be the
owner of shares of common  stock of the  Company at any time  during the term of
this  Agreement with the same rights as he or it would have had if he or it were
not  an  agent  of  the  Trustee  or a  Trustee  hereunder,  respectively,  and,
irrespective  of whether  such Trustee is an owner of any shares of common stock
of the Company,  may vote or cause votes to be cast in favor of its  agent's(s')
own election,  appointment or employment as such director,  officer, employee or
consultant.

         6.   COMPENSATION  OF  TRUSTEE.   Trustee  shall  not  be  entitled  to
compensation for its services as Trustee hereunder.

         7. LIABILITY OF TRUSTEE; INDEMNITY. Trustee shall not be liable for any
error of judgment nor for any act of commission or omission, nor for any mistake
of law or fact,  nor for anything it may do or refrain from doing in good faith,
nor generally  shall it have any  accountability  hereunder,  except for its own
willful  misconduct  or gross  negligence.  The  Shareholder  hereby  agrees  to
indemnify  and defend  Trustee  from and against  any and all  claims,  demands,
losses,  costs,  and expenses,  including but not limited to attorneys' fees and
costs paid or incurred  by Trustee,  and any and all  liability  therefor,  that
Trustee may sustain or incur in  connection  with any action taken in accordance
with the provisions of this Agreement, except for matters arising from Trustee's
own willful  misconduct or gross negligence.  Trustee hereby agrees to indemnify
and defend the Shareholder from and against any and all claims, demands, losses,
costs, and expenses, including but not limited to attorneys' fees and costs paid
or incurred by the  Shareholder,  and any and all liability  therefor,  that the
Shareholder  may  sustain  or  incur in  connection  with  any  action  taken in
accordance  with the provisions of this  Agreement,  except for matters  arising
from the Shareholder's own willful misconduct or gross negligence.

         8. TRANSACTIONS BY SHAREHOLDER.  During the term of this Agreement, the
Shareholder  shall  not have the right nor  shall it  attempt  to sell,  assign,
hypothecate,  encumber or transfer or in any other manner  dispose of any of the
Shares or any interest  therein,  including  but not limited to the Voting Trust
Certificate(s) representing such Shares; provided, however, that the Shareholder
may publicly sell Shares in the public market upon the following conditions: (i)
the Shareholder shall provide written notice to the Trustee at least twenty-four
(24) hours prior to any sale of the Shares,  and (ii) the number of Shares to be
sold by the  Shareholder  in any thirty (30) day period shall not exceed  twenty
percent (20%) of the number of Shares deposited by the Shareholder in this trust
pursuant to the terms of this  Agreement.  Upon the sale of the Shares as herein
provided the  certificates  representing the Shares sold hereby and in the hands
of Trustee shall be assigned to the Shareholder or purchaser of the Shares.

         9. FILING OF COPY OF AGREEMENT  WITH THE COMPANY.  An executed  copy of
this  Agreement  shall be filed in the office of the  Company  and be subject to
inspection by all the shareholders of the Company.



                                        3

<PAGE>



         10.  TERMINATION AND  IRREVOCABILITY  OF TRUST.  The Voting Trust shall
terminate  upon  the  first  to  occur  of the  following  events:  (i) upon the
expiration of its ten (10) year term, unless extended,  as provided by Section 2
of this  Agreement,  (ii) upon the written  consent of Trustee and  Shareholder,
(iii) an uncured  default on the Note,  (iv) in the event of the  resignation of
Trustee,  or (v) the death of Mitchell J. Stein,  the  presently  qualified  and
acting  President  of  Trustee.  Upon the  termination  of the Voting  Trust the
certificates  representing  all of the Shares held under this Agreement and then
remaining  in the hands of Trustee  shall be  assigned to the  Shareholder  then
entitled thereto.

         11.      MISCELLANEOUS.

                  (a)  Notices.  Any notices  which any party is required or may
desire to give to any other party or parties  under this  Agreement  shall be in
writing,  and  shall be  given by  addressing  the same to such  other  party or
parties  at the  address(es)  set forth  below,  and by  depositing  the same so
addressed,  postage prepaid,  certified mail, return receipt  requested,  in the
United  States mail, by  delivering  the same  personally to such other party or
parties or by  electronic  facsimile.  A party may change  the  address  for the
service of notice by  written  notice  given to the other  parties in the manner
herein provided.

                           If to Shareholder:

                           Medical Biology Institute
                           11077 North Torrey Pines Road
                           La Jolla, California 92037
                           Facsimile: (619) 453-5845

                           If to Trustee:

                           HeatlhMed, Inc.
                           8306 Wilshire Boulevard, Suite 7056
                           Beverly Hills, California 90211
                           Facsimile: (310) 652-0405

                  (b)      Parties in Interest; Assignment.

                  (i) Neither this  Agreement  nor any of the  Shareholder's  or
Trustee's  rights  hereunder  shall be assigned by such party  without the prior
written  consent of the other  party,  except that Trustee may assign its rights
and  obligations  hereunder  to an entity to be formed or caused to be formed by
Trustee.

                  (ii) Subject to the conditions on  assignment,  this Agreement
and all the provisions  hereof shall be binding upon and inure to the benefit of
the parties hereto and their respective successors and permitted assigns.


                                        4

<PAGE>



                  (c) No Third Party Beneficiaries.  Nothing herein expressed or
implied is intended or shall be  construed  to confer upon or give to any person
or  entity,  whatsoever,  other  than the  parties  hereto  and their  permitted
successors  or  assigns,  any  rights  or  remedies  under or by  reason of this
Agreement.

                  (d)  Counterparts.  This  Agreement  may be executed in two or
more  counterparts  each of which shall be deemed an original,  but all of which
together shall constitute one and the same instrument.

                  (e)  Validity  and   Severability.   The  provisions  of  this
Agreement are severable and if any provision,  clause, sentence, section or part
thereof is held to be illegal, invalid,  unconstitutional or inapplicable to any
person or circumstance,  such  illegality,  invalidity,  unconstitutionality  or
inapplicability  shall not affect or impair any of the  remaining  provision(s),
sentence(s),  clause(s), section(s) or part(s) of the Agreement, Trustee, or the
Shareholder  or to other persons or  circumstances.  It is understood and agreed
that the terms,  conditions,  and  covenants of this  Agreement  would have been
made,  entered into and this Agreement  executed by all parties if such illegal,
invalid or unconstitutional  provisions,  sentences,  clauses, sections or parts
had not been  included  therein.  To the  extent  that a portion or part of this
Agreement may be invalid, but may be made valid by the striking of certain words
or  phrases,  such  words or  phrases  shall be  deemed to be  stricken  and the
remainder of the other portions of this Agreement shall remain in full force and
effect.

                  (f)  Governing  Law.  This  Agreement  shall be construed  and
governed  by the  laws  of the  State  of  California  and  the  invalidity  and
unenforceability  of any  provision  hereof  shall not  affect the  validity  or
enforceability  of any  other  provision.  The  parties  hereby  consent  to the
jurisdiction of the federal and state courts located in either the county of Los
Angeles or San Diego,  California,  for any action or suit  arising  out of this
Agreement,  and waive  any  defense  to such  jurisdiction,  including,  without
limitation, any defense based on venue or inconvenient forum.

                  (g)  Headings.  The  headings  herein are for  convenience  of
reference  only and shall not control or affect the meaning or  construction  of
any provisions hereof.

                  (h) Entire Agreement,  Amendments and Waiver.  This Agreement,
recitals,  Schedules,  any amendments hereto or thereto,  and the other writings
referred to herein or therein or delivered pursuant hereto or thereto which form
a part hereof or thereof  contain the entire  understanding  of the parties with
respect to the  subject  matter  hereof.  This  Agreement  supersedes  all prior
agreements  and  understandings  between the parties with respect to its subject
matter. This Agreement may be amended only by a written instrument duly executed
by all of the parties hereto. Any condition to a party's  obligations  hereunder
may be waived in writing by such party to the extent permitted by law.



                                        5

<PAGE>



                  (i)  Specific   Performance.   The   Shareholder  and  Trustee
acknowledge that, in view of the uniqueness of the Company's  business,  a party
hereto would not have an adequate  remedy at law for money  damages in the event
the other party breached any of the terms of this Agreement and, therefore,  the
parties agree that each party shall be entitled to specific  enforcement against
the other  party for  performance  of the terms  hereof in addition to any other
remedy to which it may be entitled  at law or in equity,  and in any such action
or proceeding the responding  party(ies) will not raise or tender any defense to
the effect that the petitioning party has an adequate remedy at law.

         IN WITNESS WHEREOF,  the undersigned have executed this Agreement as of
the date first written above.

                                  "SHAREHOLDER"

                                   MEDICAL BIOLOGY INSTITUTE


                                   By:_______________________________________
                                      David Katz, M.D.
                                      Its: President



                                   By:_______________________________________
                                      Christopher S. McKellar
                                      Its: Chairman of the Board


                                    "TRUSTEE"

                                    HEALTHMED, INC.



                                     By:
                                        Mitchell J. Stein
                                        Its: President & Secretary





                                        6

<PAGE>



                                   SCHEDULE 1

                                   Shareholder


                                                  No. Shares of Stock Deposited

 MEDICAL BIOLOGY INSTITUTE                            151,900 Class A Shares







                                        7

<PAGE>



                                   SCHEDULE 2

                            Voting Trust Certificate


No. 001                                        151,900 Shares of Class A Stock


                              LIDAK PHARMACEUTICALS
                            VOTING TRUST CERTIFICATE


         This  is  to  certify  that  Medical  Biology  Institute  ("Certificate
Holder")  has  transferred  to the  person  now and  hereafter  listed as voting
trustee (the  "Trustee")  on the  signature  page of that  certain  Voting Trust
Agreement,  dated January 12, 1998, or any extension  thereof (the "Voting Trust
Agreement") the above-stated number of shares of stock of LIDAK Pharmaceuticals,
a California corporation ("Corporation"),  to be held by the Trustee pursuant to
the terms of the Voting Trust Agreement.  The Certificate Holder, or his/her/its
permitted successor or successors-in-interest,  is entitled to all of the rights
accorded the Certificate Holder under the terms of the Voting Trust Agreement.

         THE SALE,  ASSIGNMENT,  HYPOTHECATION,  ENCUMBRANCE OR TRANSFER OF THIS
VOTING TRUST CERTIFICATE IS RESTRICTED BY THE VOTING TRUST AGREEMENT,  A COPY OF
WHICH HAS BEEN FILED WITH THE SECRETARY OF CORPORATION.

         Dated as of January 12, 1998.

                                          VOTING TRUSTEE:

                                          HEALTHMED, INC.



                                          By:_________________________________
                                              Mitchell J. Stein
                                              Its: President & Secretary

MEDICAL BIOLOGY INSTITUTE                 No. Shares of Class A Stock Deposited


By:____________________________                          151,900
     David Katz, M.D.
     Its: President


                                        8

<PAGE>



                                   SCHEDULE 3

                            Voting Trust Certificate


No. 001                                       ________ Shares of Class B Stock

                              LIDAK PHARMACEUTICALS
                            VOTING TRUST CERTIFICATE


         This  is  to  certify  that  Medical  Biology  Institute  ("Certificate
Holder")  has  transferred  to the  person  now and  hereafter  listed as voting
trustee (the  "Trustee")  on the  signature  page of that  certain  Voting Trust
Agreement,  dated January 12, 1998, or any extension  thereof (the "Voting Trust
Agreement") the above-stated number of shares of stock of LIDAK Pharmaceuticals,
a California corporation ("Corporation"),  to be held by the Trustee pursuant to
the terms of the Voting Trust Agreement.  The Certificate Holder, or his/her/its
permitted successor or successors-in-interest,  is entitled to all of the rights
accorded the Certificate Holder under the terms of the Voting Trust Agreement.

         THE SALE,  ASSIGNMENT,  HYPOTHECATION,  ENCUMBRANCE OR TRANSFER OF THIS
VOTING TRUST CERTIFICATE IS RESTRICTED BY THE VOTING TRUST AGREEMENT,  A COPY OF
WHICH HAS BEEN FILED WITH THE SECRETARY OF CORPORATION.

         Dated as of January 12, 1998.
                                           VOTING TRUSTEE:

                                           HEALTHMED, INC.



                                           By:_________________________________
                                              Mitchell J. Stein
                                              Its: President & Secretary

MEDICAL BIOLOGY INSTITUTE                No. Shares of Class B Stock Deposited


By:____________________________                        ___________
     David Katz, M.D.
     Its: President


                                        9

<PAGE>



                                    EXHIBIT A




                                       10

<PAGE>


                                    EXHIBIT B





                                       11


                                 PROMISSORY NOTE

                                                        Los Angeles, California
$1,528,234.98                                                  January 12, 1998

         FOR VALUE  RECEIVED,  the  undersigned,  HealthMed,  Inc., a California
corporation ("Maker"), hereby promises to pay to David Katz, M.D., an individual
("Holder"),  or his order,  at La Jolla,  California,  the  principal sum of One
Million Five Hundred  Twenty Eight  Thousand Two Hundred  Thirty Four and 98/100
Dollars  ($1,528,234.98)  on January  12,  2000  ("Maturity  Date"),  and to pay
interest on the unpaid  balance of said  principal  from the date  hereof  until
payment in full at the rate of ten percent (10%) per annum computed on the basis
of a year of 360 days for the actual number of days elapsed.

         Accrued interest due hereunder shall be payable  annually,  in arrears,
on the  12th day of  January  in each  year and at  maturity  until  all  unpaid
principal and accrued and unpaid interest due hereunder is paid in full.

         Maker agrees that if for any reason it fails to make any of the monthly
payments required herein,  including the amount due at the Maturity Date, within
ten (10) days after the due date,  Holder  shall be  entitled to damages for the
detriment  caused thereby,  the extent of which damages are extremely  difficult
and  impractical to ascertain.  Maker  therefor  agrees that a sum equal to five
percent (5%) of such delinquent payment is a reasonable estimate of such damages
and Maker agrees to pay such sum upon demand by Holder.  Maker's  tender of such
late charge, without Holder's acceptance thereof, shall in no event constitute a
waiver of Maker's  default with  respect to such overdue  amount nor prevent the
Holder from exercising any of the other rights and remedies granted hereunder.

         Principal and interest  shall be paid in lawful  currency of the United
States of America.

         Maker  reserves the right to prepay this Note,  in whole or in part, at
any  time or  from  time  to  time  without  penalty  or  premium,  or upon  the
acceleration  of this Note as  permitted  hereunder.  Any  prepayments  shall be
credited first to the payment of costs and charges of  collection,  if any, then
to accrued but unpaid interest hereon and the remainder to principal.

         This  Note  is  issued  and  delivered  pursuant  to a  Stock  Purchase
Agreement  entered into by and between David Katz, M.D. and the undersigned (the
"Agreement")  of even date herewith,  and the Holder of this Note is entitled to
all  benefits  provided  therein.  The  Agreement  contains  provisions  for the
acceleration  of the  Maturity  Date  hereof for a portion of this Note upon the
happening of certain stated events.  Upon the occurrence of any event of default
specified in the  Agreement,  the entire unpaid balance shall at once become due
and payable at the option of the holder of this Note.

         Should  a  default  be made in any  installment  of  interest  when due
hereunder,  which default shall continue for a period of fifteen (15) days after
written notice by the holder of this Note of


                                        1

<PAGE>


such  default to Maker,  the whole sum of principal  and interest due  hereunder
shall,  at the  option of the holder of this Note,  become  immediately  due and
payable.

         Maker  waives  diligence,  presentment,  protest,  demand and notice of
protest,  demand and of dishonor  and  nonpayment  of this Note,  and  expressly
agrees that this Note, or any payment  hereunder,  may be extended by the holder
from time to time without in any way affecting the liability of Maker.

         Maker  agrees  to  reimburse  the  holder of this Note for all costs of
collection  or  enforcement  of  this  Note,  including,  but  not  limited  to,
reasonable  attorneys' fees, incurred by such holder. Maker shall also reimburse
Holder  for  all  attorneys'   fees  and  costs   reasonably   incurred  in  the
representation of Holder in any bankruptcy, insolvency,  reorganization or other
debtor-relief  proceeding  of or  relating  to Maker or any  collateral  for the
obligations hereunder.

         The  terms of this  Note  shall  inure to the  benefit  of and bind the
parties hereto and their  successors and assigns.  Maker represents and warrants
to Holder that the  obligations  hereunder  arise out of or in  connection  with
business  purposes  and do not  relate  to any  personal,  family  or  household
purpose. As used herein the term "Maker" shall include the undersigned Maker and
any other person or entity who may  subsequently  become  liable for the payment
hereof.  The term  "Holder"  shall include the named Holder as well as any other
person or entity to whom  this Note or any  interest  in this Note is  conveyed,
transferred  or  assigned.  Each  person  signing  this  Note on behalf of Maker
represents  and warrants that he has full  authority to do so and that this Note
binds the corporation.

         This Note shall be governed by and  construed  in  accordance  with the
laws of the State of California.

                                         HEALTHMED, INC.



                                         By:_________________________________
                                            Mitchell J. Stein
                                            Its: President & Secretary



                                        2


                                 PROMISSORY NOTE

                                                        Los Angeles, California
$263,004.00                                                    January 12, 1998

         FOR  VALUE  RECEIVED,  the  undersigned,   HealthMed,  Inc.,  a  Nevada
corporation  ("Maker"),  hereby promises to pay to Medical Biology Institute,  a
California nonprofit public benefit corporation ("Holder"),  or its order, at La
Jolla,  California,  the principal sum of Two Hundred Sixty Three  Thousand Four
and No/100 Dollars  ($263,004.00) on January 12, 2000 ("Maturity  Date"), and to
pay interest on the unpaid  balance of said principal from the date hereof until
payment in full at the rate of ten percent (10%) per annum computed on the basis
of a year of 360 days for the actual number of days elapsed.

         Accrued interest due hereunder shall be payable  annually,  in arrears,
on the  12th day of  January  in each  year and at  maturity  until  all  unpaid
principal and accrued and unpaid interest due hereunder is paid in full.

         Maker agrees that if for any reason it fails to make any of the monthly
payments required herein,  including the amount due at the Maturity Date, within
ten (10) days after the due date,  Holder  shall be  entitled to damages for the
detriment  caused thereby,  the extent of which damages are extremely  difficult
and  impractical to ascertain.  Maker  therefor  agrees that a sum equal to five
percent (5%) of such delinquent payment is a reasonable estimate of such damages
and Maker agrees to pay such sum upon demand by Holder.  Maker's  tender of such
late charge, without Holder's acceptance thereof, shall in no event constitute a
waiver of Maker's  default with  respect to such overdue  amount nor prevent the
Holder from exercising any of the other rights and remedies granted hereunder.

         Principal and interest  shall be paid in lawful  currency of the United
States of America.

         Maker  reserves the right to prepay this Note,  in whole or in part, at
any  time or  from  time  to  time  without  penalty  or  premium,  or upon  the
acceleration  of this Note as  permitted  hereunder.  Any  prepayments  shall be
credited first to the payment of costs and charges of  collection,  if any, then
to accrued but unpaid interest hereon and the remainder to principal.

         This  Note  is  issued  and  delivered  pursuant  to a  Stock  Purchase
Agreement  entered  into  by and  between  Medical  Biology  Institute  and  the
undersigned (the "Agreement") of even date herewith, and the Holder of this Note
is entitled to all benefits provided therein.  The Agreement contains provisions
for the acceleration of the Maturity Date hereof for a portion of this Note upon
the  happening of certain  stated  events.  Upon the  occurrence of any event of
default  specified in the  Agreement,  the entire  unpaid  balance shall at once
become due and payable at the option of the holder of this Note.

         Should  a  default  be made in any  installment  of  interest  when due
hereunder,  which default shall continue for a period of fifteen (15) days after
written notice by the holder of this Note of


                                        1

<PAGE>


such  default to Maker,  the whole sum of principal  and interest due  hereunder
shall,  at the  option of the holder of this Note,  become  immediately  due and
payable.

         Maker  waives  diligence,  presentment,  protest,  demand and notice of
protest,  demand and of dishonor  and  nonpayment  of this Note,  and  expressly
agrees that this Note, or any payment  hereunder,  may be extended by the holder
from time to time without in any way affecting the liability of Maker.

         Maker  agrees  to  reimburse  the  holder of this Note for all costs of
collection  or  enforcement  of  this  Note,  including,  but  not  limited  to,
reasonable  attorneys' fees, incurred by such holder. Maker shall also reimburse
Holder  for  all  attorneys'   fees  and  costs   reasonably   incurred  in  the
representation of Holder in any bankruptcy, insolvency,  reorganization or other
debtor-relief  proceeding  of or  relating  to Maker or any  collateral  for the
obligations hereunder.

         The  terms of this  Note  shall  inure to the  benefit  of and bind the
parties hereto and their  successors and assigns.  Maker represents and warrants
to Holder that the  obligations  hereunder  arise out of or in  connection  with
business  purposes  and do not  relate  to any  personal,  family  or  household
purpose. As used herein the term "Maker" shall include the undersigned Maker and
any other person or entity who may  subsequently  become  liable for the payment
hereof.  The term  "Holder"  shall include the named Holder as well as any other
person or entity to whom  this Note or any  interest  in this Note is  conveyed,
transferred  or  assigned.  Each  person  signing  this  Note on behalf of Maker
represents  and warrants that he has full  authority to do so and that this Note
binds the corporation.

         This Note shall be governed by and  construed  in  accordance  with the
laws of the State of California.

                                    HEALTHMED, INC.



                                    By:_________________________________
                                        Mitchell J. Stein
                                       Its: President & Secretary




                                        2




                             HEALTHMED INCORPORATED               Inside Line:
Mitchell J. Stein         National Healthcare Alliance            (310)246-9542
President                                                         Inside Facs: 
                                January 12, 1998                  (310)652-0405
                                                                       

VIA FACSIMILE

David Katz, M.D.
Chief Executive Officer
LIDAK PHARMACEUTICALS
11077 N. Torrey Pines Road
La Jolla, California 92037

Dear David:

         As our  representatives  have  told  you,  we  are  excited  about  the
opportunity  to  assist  Lidak  Pharmaceuticals   ("Lidak")  in  completing  the
development  of its  extraordinary  pharmaceutical  technologies,  and  then  in
swiftly and  efficiently  bringing  them to market.  As I stated to the Board of
Directors on Saturday,  apart from the obvious  profit motive that anybody would
have regarding Lidak's  technologies,  we are mindful of the "moral  imperative"
that accompanies the hopes associated with many of the technologies.  The public
deserves to have these  technologies  developed and distributed as rapidly as is
practical.

         HEALTHMED AND NATIONAL CENTURY

         HealthMed,  Inc.  ("HealthMed") is affiliated with several large health
care companies, including National Century Financial Enterprises, Inc. ("NCFE").
NCFE is one of the largest  heath care  financiers  in the century,  with assets
well  in  excess  of  $1,000,000,0000.00   ($1  billion).   HealthMed  and  NCFE
(hereinafter  sometimes  "affiliates") are capable of providing a broad array of
financing,  from loan to credit lines to accounts receivable facilities.  We are
capable of arranging  financing with virtually unlimited levels of creativity in
order to  accommodate  the business  objectives  of the client.  The  overriding
purpose is to provide a "life line" to  companies  such a Lidak which  require a
strategic partner to secure sufficient working capital to assure operational and
strategic  integrity.  The  financing  packages  placed  by the  affiliates  are
designed to underwrite advances based upon projected growth and income levels.

         LIDAK'S FUTURE COURSE

         We have  decided to become  involved  with Lidak,  if  appropriate,  to
secure for Lidak operational integrity from the standpoint of enabling the Lidak
operations to closely track the Lidak  business  plan. As we understand it, that
business  plan  has as its core the  billion-dollar-plus  herpes  pharmaceutical
market which Lidak intends to profoundly penetrate.  With these kinds of revenue
projections,  and considering the prospective  success of Lidakol, it appears to
us imperative  that Lidak  consummate  plans to saturate the market  immediately
upon NDA approval.


<PAGE>


HEALTHMED INCORPORATED
National Healthcare Alliance
- ------------------------------------------------------------------------------


David Katz, M.D.
LIDAK PHARMACEUTICALS
January 12, 1998
Page 2



Indeed,  this is the best way to assure methodical  development of Lidak's other
revolutionary  technologies.  And there is obviously a salutary  purpose for the
standpoint of those persons afflicted with the diseases that would be treated by
these technologies.

         THE PROPOSAL

         Our  proposal  to Lidak is to  advance  money to the  Company  in three
stages, as follows:

         Stage 1: $13 million to $30 million (within three to four weeks of plan
approval):
- ---------

         This  money  will be  earmarked  to provide  Lidak  with  resources  to
facilitate and revitalize  research and development on ongoing and various other
Lidak  technologies  which may have been  temporarily  scaled  back to  conserve
precious and limited available capital.  These include,  but are not limited to,
additional promising  indications for therapeutic  applications of Lidakol (both
topical and systemic,  such as in AIDS,  etc.),  further  exploration  of cancer
vaccine therapies using LMI and dendritic cell techniques,  deeper investigation
of the stern cell technology  potential for bone marrow  transplants and rapidly
ramping up chemistry requirements to bring the allergy and asthma program to the
clinical trial stage as soon as possible.

         Concurrent with the R&D emphasis  described above, we expect that Stage
1 monies will also be used to provide the  necessary  funds to properly  assess,
strategize and otherwise  prepare Lidak and its staff (and  potential  partners)
for  manufacturing,  marketing and  distributing  Lidakol in the North  American
markets (and throughout the world).  For example,  certain long lead-time issues
critical for eventual marketing support (publications and other education items)
will be one  focus  during  the next  2-3  months.  Also,  during  this  initial
time-frame,  we intend to work with the Lidak  staff to  ascertain  the  optimal
course for marketing  Lidakol in the U.S.  (including  partnerships with outside
parties, co-marketing strategies, etc.).

         Stage 2: Up to $30 million  (during four to seven month following Stage
1 advance):
- ----------

         This money (amount to be determined  based on  assessments  made during
Stage 1) will be  earmarked  for  operational  use  during  the  first  phase of
distribution  of Lidakol once FDA approval  has been  granted.  The bulk of this
money will most likely be used in the initial marketing phase to effectively and
rapidly make the general  public aware of Lidakol's  existence,  indication  and
therapeutic effectiveness.


<PAGE>


HEALTHMED INCORPORATED
National Healthcare Alliance
- -------------------------------------------------------------------------------


David Katz, M.D.
LIDAK PHARMACEUTICALS
January 12, 1998
Page 3



         Stage 3: $50 million to $70  million  (during  nine to eighteen  months
following Stage 1 adance):
- -------------------------------------------------------------------------------

         This money will be earmarked to support (a)  continued  development  of
existing  technologies  (or newly  discovered or acquired  ones) and (b) further
advancement  and indeed  perfection  of Lidak's  business  plans as crafted  and
matured  during  ongoing  strategic  planning  taking shape during Stage 1 and 2
time-frame.

         CONDITIONS PRECEDENT TO IMPLEMENTATION OF THE PROPOSAL

         The above  proposals are subject to certain  conditions  precedent,  as
follows:

         Stage 1 Conditions Precedent:

         (a)  confirming  the  balance of due  diligence  items set out in prior
correspondence;

         (b)  receiving  sufficient  entry of  shareholders  into  voting  trust
arrangements with HealthMed;

         (c) accomplishing the necessary  reconfiguration  of the Lidak Board of
Directors; and

         (d) receiving  from Lidak and then  confirming a realistic pro forma of
the revenue stream associated with the initial roll out of Lidakol.

         Stage 2 Conditions Precedent:

         In addition to the Stage 1 prerequisites, the second stage is dependent
and conditioned  upon receiving an approvable  letter for the NDA and conducting
due diligence  regarding  strategic  alliances with the network of hospitals and
other providers associated with the affiliates.

         Stage 3 Conditions Precedent:

         The third stage would, in addition,  be dependent and conditioned  upon
technological  due diligence  regarding the efficacy of the  technologies  other
than  Lidakol and  projections  regarding  the  completion  of  development  and
distribution thereof.



<PAGE>


HEALTHMED INCORPORATED
National Healthcare Alliance
- -------------------------------------------------------------------------------


David Katz, M.D.
LIDAK PHARMACEUTICALS
January 12, 1998
Page 4


         GENERAL REPAYMENT STANDARDS

         Obviously, it is the intention of the affiliates to implement the above
programs  on a non-  dilutive  basis  so that  Lidak  would be  responsible  for
returning the financing (along with competitive  interest and program costs) out
of its future  revenue  stream.  The object of the financing  would be to assure
that such a  repayment  would  only  occur in a manner  which is  sensitive  and
productive to Lidak's future well-being.

         We would,  sincerely, be honored to begin working with you and Lidak on
these important projects.

                                 Very truly yours,

                                 HEALTHMED, INC.


                                 By:  MITCHELL J. STEIN
                                      President



© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission