LIDAK PHARMACEUTICALS
SC 13D/A, 1998-04-02
PHARMACEUTICAL PREPARATIONS
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<PAGE>

                          SECURITIES AND EXCHANGE COMMISSION
                               Washington, D.C.  20549

                                     SCHEDULE 13D



                      Under the Securities Exchange Act of 1934
                                  (Amendment No. 2)

                                Lidak Pharmaceuticals
                                ---------------------
                                   (Name of Issuer)



                    Class A Common Stock and Class B Common Stock     
                   -----------------------------------------------
                            (Title of Class of Securities)

                                      531707107                      
                        -------------------------------------
                        (CUSIP Number of Class of Securities)


                               Michael D. Donahue, Esq.
                                 Asher M. Leids, Esq.
                            Donahue, Mesereau & Leids LLP
                               1900 Avenue of the Stars
                                      Suite 2700
                            Los Angeles, California  90067
                                    (310) 277-1441             
                              --------------------------
             (Name, Address and Telephone Number of Person Authorized to
                         Receive Notices and Communications)


                                     March 25, 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 Statement because of 
Rule  13d-1(b)(3) or (4), check the following                              / /

Check the following box if a fee is being paid with this Statement:        / /

<PAGE>
- ------------------------------------------------------------------------------
                                                                         
CUSIP No. 531707107
- ------------------------------------------------------------------------------
 (1)  NAME OF REPORTING PERSON:  HealthMed, Inc.
      S.S. OR I.R.S.  IDENTIFICATION NOS. OF ABOVE PERSON: 91-1878972
- ------------------------------------------------------------------------------
                                                                      
 (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:                 (a)/X/
                                                                        (b)/ /
- ------------------------------------------------------------------------------
 (3)  SEC USE ONLY
- ------------------------------------------------------------------------------
 (4)  SOURCE OF FUNDS*
          00 HealthMed, Inc. Is obligated to pay an aggregate of $1,791,238.98
          in promissory notes for the shares purchased from Dr. Katz and Medical
          Biology Institute
- ------------------------------------------------------------------------------
 (5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS 
      REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)                              / /
- ------------------------------------------------------------------------------
 (6)  CITIZENSHIP OR PLACE OF ORGANIZATION
                               Nevada
- ------------------------------------------------------------------------------
                         : (7)     SOLE VOTING POWER
                         :         2,200,424
                         :                                                  
 NUMBER OF               -----------------------------------------------------
 SHARES                  : (8)     SHARED VOTING POWER
 BENEFICIALLY            :           -0-
 OWNED BY                :                                                    
 EACH                    -----------------------------------------------------
 REPORTING               : (9)     SOLE DISPOSITIVE POWER
 PERSON WITH             :         1,165,821
                         :                                                    
                         -----------------------------------------------------
                         :(10)     SHARED DISPOSITIVE POWER
                         :           -0-
- ------------------------------------------------------------------------------
(11)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
      REPORTING PERSON
                                      2,200,424
- ------------------------------------------------------------------------------
(12)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11                          /X/
      EXCLUDES CERTAIN SHARES*                         
- ------------------------------------------------------------------------------
(13)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
                                         5.4%
- ------------------------------------------------------------------------------
(14)  TYPE OF REPORTING PERSON*
                                          CO
- ------------------------------------------------------------------------------
                        *SEE INSTRUCTIONS BEFORE FILLING OUT!
                                                                              

                                       2

<PAGE>
- ------------------------------------------------------------------------------
CUSIP No. 531707107
- ------------------------------------------------------------------------------
(1)   NAME OF REPORTING PERSON:     Mitchell J. Stein
      S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSON: 
- ------------------------------------------------------------------------------
(2)   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:               (a)  /X/
                                                                      (b)  / /
- ------------------------------------------------------------------------------
 (3)  SEC USE ONLY
- ------------------------------------------------------------------------------
                                                                          
 (4)  SOURCE OF FUNDS*
          00 HealthMed, Inc. Is obligated to pay an aggregate of $1,791,238.98
          in promissory notes for the shares purchased from Dr. Katz and Medical
          Biology Institute
- ------------------------------------------------------------------------------
(5)   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS                      / /
      REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)         
- ------------------------------------------------------------------------------
(6)  CITIZENSHIP OR PLACE OF ORGANIZATION
                         United States of America
- ------------------------------------------------------------------------------
                         : (7)     SOLE VOTING POWER
                         :              -0-
 NUMBER OF SHARES        :                                                  
                         -----------------------------------------------------
                         : (8)     SHARED VOTING POWER
 BENEFICIALLY            :              -0-  
 OWNED BY                :                                                  
 EACH                    -----------------------------------------------------
 REPORTING               : (9)     SOLE DISPOSITIVE POWER
 PERSON WITH             :              -0-
                         :                                                  
                         -----------------------------------------------------
                         :(10)     SHARED DISPOSITIVE POWER
                         :              -0-
- ------------------------------------------------------------------------------
(11)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
      REPORTING PERSON
                                      2,200,424
- ------------------------------------------------------------------------------
(12)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
      EXCLUDES CERTAIN SHARES*                                             /X/
- ------------------------------------------------------------------------------
(13)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
                                         5.4%
- ------------------------------------------------------------------------------
(14)  TYPE OF REPORTING PERSON*
                                          IN
- ------------------------------------------------------------------------------
                        *SEE INSTRUCTIONS BEFORE FILLING OUT!

                                       3
<PAGE>
- ------------------------------------------------------------------------------
CUSIP No. 531707107
- ------------------------------------------------------------------------------
(1)   NAME OF REPORTING PERSON:     National Trust Properties, Inc
      S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSON: 
- ------------------------------------------------------------------------------
(2)   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:               (a)  /X/
                                                                      (b)  / /
- ------------------------------------------------------------------------------
 (3)  SEC USE ONLY
- ------------------------------------------------------------------------------
                                                                          
 (4)  SOURCE OF FUNDS*
          
          Not Applicable
          
- ------------------------------------------------------------------------------
(5)   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS                      / /
      REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)         
- ------------------------------------------------------------------------------
(6)  CITIZENSHIP OR PLACE OF ORGANIZATION
                         United States of America
- ------------------------------------------------------------------------------
                         : (7)     SOLE VOTING POWER
                         :              -0-
 NUMBER OF SHARES        :                                                  
                         -----------------------------------------------------
                         : (8)     SHARED VOTING POWER
 BENEFICIALLY            :              -0-  
 OWNED BY                :                                                  
 EACH                    -----------------------------------------------------
 REPORTING               : (9)     SOLE DISPOSITIVE POWER
 PERSON WITH             :              -0-
                         :                                                  
                         -----------------------------------------------------
                         :(10)     SHARED DISPOSITIVE POWER
                         :              -0-
- ------------------------------------------------------------------------------
(11)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
      REPORTING PERSON
                                      2,200,424
- ------------------------------------------------------------------------------
(12)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
      EXCLUDES CERTAIN SHARES*                                             /X/
- ------------------------------------------------------------------------------
(13)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
                                         5.4%
- ------------------------------------------------------------------------------
(14)  TYPE OF REPORTING PERSON*
                                          CO
- ------------------------------------------------------------------------------
                        *SEE INSTRUCTIONS BEFORE FILLING OUT!

                                       4

<PAGE>
- ------------------------------------------------------------------------------
CUSIP No. 531707107
- ------------------------------------------------------------------------------
(1)   NAME OF REPORTING PERSON:     The Trammel Trust
      S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSON: 
- ------------------------------------------------------------------------------
(2)   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:               (a)  /X/
                                                                      (b)  / /
- ------------------------------------------------------------------------------
 (3)  SEC USE ONLY
- ------------------------------------------------------------------------------
                                                                          
 (4)  SOURCE OF FUNDS*
          
          Not Applicable
          
- ------------------------------------------------------------------------------
(5)   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS                      / /
      REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)         
- ------------------------------------------------------------------------------
(6)  CITIZENSHIP OR PLACE OF ORGANIZATION
                         United States of America
- ------------------------------------------------------------------------------
                         : (7)     SOLE VOTING POWER
                         :              -0-
 NUMBER OF SHARES        :                                                  
                         -----------------------------------------------------
                         : (8)     SHARED VOTING POWER
 BENEFICIALLY            :              -0-  
 OWNED BY                :                                                  
 EACH                    -----------------------------------------------------
 REPORTING               : (9)     SOLE DISPOSITIVE POWER
 PERSON WITH             :              -0-
                         :                                                  
                         -----------------------------------------------------
                         :(10)     SHARED DISPOSITIVE POWER
                         :              -0-
- ------------------------------------------------------------------------------
(11)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
      REPORTING PERSON
                                      2,200,424
- ------------------------------------------------------------------------------
(12)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
      EXCLUDES CERTAIN SHARES*                                             /X/
- ------------------------------------------------------------------------------
(13)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
                                         5.4%
- ------------------------------------------------------------------------------
(14)  TYPE OF REPORTING PERSON*
                                          OO
- ------------------------------------------------------------------------------
                        *SEE INSTRUCTIONS BEFORE FILLING OUT!

                                       5
<PAGE>
- ------------------------------------------------------------------------------
CUSIP No. 531707107
- ------------------------------------------------------------------------------
(1)   NAME OF REPORTING PERSON:     Edward L. Hennessy, Jr.
      S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSON: 
- ------------------------------------------------------------------------------
(2)   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:               (a)  /X/
                                                                      (b)  / /
- ------------------------------------------------------------------------------
 (3)  SEC USE ONLY
- ------------------------------------------------------------------------------
                                                                          
 (4)  SOURCE OF FUNDS*
          
          PF
          
- ------------------------------------------------------------------------------
(5)   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS                      / /
      REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)         
- ------------------------------------------------------------------------------
(6)  CITIZENSHIP OR PLACE OF ORGANIZATION
                         United States of America
- ------------------------------------------------------------------------------
                         : (7)     SOLE VOTING POWER
                         :              50,000
 NUMBER OF SHARES        :                                                  
                         -----------------------------------------------------
                         : (8)     SHARED VOTING POWER
 BENEFICIALLY            :              -0-  
 OWNED BY                :                                                  
 EACH                    -----------------------------------------------------
 REPORTING               : (9)     SOLE DISPOSITIVE POWER
 PERSON WITH             :              50,000
                         :                                                  
                         -----------------------------------------------------
                         :(10)     SHARED DISPOSITIVE POWER
                         :              -0-
- ------------------------------------------------------------------------------
(11)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
      REPORTING PERSON
                                      50,000
- ------------------------------------------------------------------------------
(12)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
      EXCLUDES CERTAIN SHARES*                                             /X/
- ------------------------------------------------------------------------------
(13)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
                                         0.1%
- ------------------------------------------------------------------------------
(14)  TYPE OF REPORTING PERSON*
                                          IN
- ------------------------------------------------------------------------------
                        *SEE INSTRUCTIONS BEFORE FILLING OUT!

                                       6

<PAGE>

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

CUSIP No. 531707107
- ------------------------------------------------------------------------------
 (1) NAME OF REPORTING PERSON:     Wallace O. Raubenheimer
      S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSON: 
- ------------------------------------------------------------------------------
                                                                        
 (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:               (a)  /X/
                                                                      (b)  / /
- ------------------------------------------------------------------------------
 (3)  SEC USE ONLY
- ------------------------------------------------------------------------------
 (4)  SOURCE OF FUNDS*   PF
- ------------------------------------------------------------------------------
 (5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS 
      REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)                              / /

- ------------------------------------------------------------------------------
 (6)  CITIZENSHIP OR PLACE OF ORGANIZATION
                               United States of America
- ------------------------------------------------------------------------------
                         : (7)     SOLE VOTING POWER
                         :         144,134
 NUMBER OF               :                                                   
 SHARES                  -----------------------------------------------------
 BENEFICIALLY            : (8)     SHARED VOTING POWER
 OWNED BY                :           -0-
 EACH                    :                                                   
 REPORTING               -----------------------------------------------------
 PERSON WITH             : (9)     SOLE DISPOSITIVE POWER
                         :         144,134
                         :                                                  
                         -----------------------------------------------------
                         :(10)     SHARED DISPOSITIVE POWER 
                         :           -0-
- ------------------------------------------------------------------------------
(11)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
      REPORTING PERSON
                                       618,702
- ------------------------------------------------------------------------------
(12)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
      EXCLUDES CERTAIN SHARES*                                             /X/
- ------------------------------------------------------------------------------
(13)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
                                         1.6%
- ------------------------------------------------------------------------------
(14)  TYPE OF REPORTING PERSON* 
                                          IN
- ------------------------------------------------------------------------------
                                                                        
                        *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                       7

<PAGE>

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

CUSIP No. 531707107
- ------------------------------------------------------------------------------
 (1) NAME OF REPORTING PERSON:     George P. Rutland
      S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSON: 
- ------------------------------------------------------------------------------
                                                                       
 (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:               (a)  /X/
                                                                      (b)  / /
- ------------------------------------------------------------------------------
 (3)  SEC USE ONLY
- ------------------------------------------------------------------------------
 (4)  SOURCE OF FUNDS*   PF
- ------------------------------------------------------------------------------
 (5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS 
      REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)                              / /

- ------------------------------------------------------------------------------
 (6)  CITIZENSHIP OR PLACE OF ORGANIZATION
                         United States of America
- ------------------------------------------------------------------------------
                         : (7)     SOLE VOTING POWER
                         :         88,000
 NUMBER OF               :                                                  
 SHARES                  -----------------------------------------------------
 BENEFICIALLY            : (8)     SHARED VOTING POWER
 OWNED BY                :          12,000
 EACH                    :                                                    
 REPORTING               -----------------------------------------------------
 PERSON WITH             : (9)     SOLE DISPOSITIVE POWER
                         :         88,000
                         :                                                  
                         -----------------------------------------------------
                         :(10)     SHARED DISPOSITIVE POWER
                         :         12,000
- ------------------------------------------------------------------------------
(11)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
      REPORTING PERSON
                                       100,000
- ------------------------------------------------------------------------------
(12)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
      EXCLUDES CERTAIN SHARES*                                             /X/
- ------------------------------------------------------------------------------
(13)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
                                         0.2%
- ------------------------------------------------------------------------------
(14)  TYPE OF REPORTING PERSON*
                                          IN
- ------------------------------------------------------------------------------
                        *SEE INSTRUCTIONS BEFORE FILLING OUT!

                                       8

<PAGE>

          This Amendment No. 2 amends and supplements the statement on 
Schedule 13D, dated January 12, 1998, and Amendment No. 1 of Schedule 13D, 
dated March 6, 1998 relating to the Class A Common Stock, no par value (the 
"Class A Common Stock") and the Class B Common Stock, no par value (the 
"Class B Common Stock") (the Class A Common Stock and the Class B Common 
Stock may hereinafter be referred to collectively as, the "Shares"), issued 
by Lidak Pharmaceuticals, a California corporation (the "Company"), and is 
being filed pursuant to Rule 13d-2 under the Securities Exchange Act of 1934, 
as amended (the "Exchange Act").

          The information set forth in the Exhibits attached hereto is hereby 
expressly incorporated herein by reference and the response to each item of 
this Schedule 13D is qualified in its entirety by the provisions of such 
exhibits.

ITEM 1.  SECURITY AND ISSUER

      This statement on Schedule 13D (the "Schedule 13D") relates to the 
Shares of the Company.  The principal executive offices of the Company are 
located at 11077 N. Torrey Pines Road, La Jolla, California 92037.

ITEM 2.  IDENTITY AND BACKGROUND

          (a)  This Schedule 13D is being filed by HealthMed, Inc., a Nevada 
Corporation, National Trust Properties, Inc., an Arizona corporation 
("National"), The Trammel Trust, a trust formed under the laws of the state 
of California (the "Trust") and the following natural persons: Mitchell J. 
Stein, Edward L. Hennessy, Jr., Wallace O. Raubenheimer and George P. Rutland 
(collectively, the "Reporting Persons"). The name, address, citizenship and 
present principal occupation or employment of each executive officer, 
director and each person controlling Healthmed, Inc. and National are set 
forth in Annex I hereto, which Annex I is hereby incorporated herein by this 
reference.

          (b)  HealthMed, Inc.'s principal business and principal office 
address is 8306 Wilshire Boulevard, Suite 7056, Beverly Hills, California 
90211.  National's principal business address is c/o HealthMed, Inc., 8306 
Wilshire Boulevard, Suite 7056, Beverly Hills, California 90211.  The Trust's 
principal business address is 233 Wilshire Blvd, Suite 960, Santa Monica, 
California 90401. Mr. Stein's address is 8306 Wilshire Boulevard, Suite 7056, 
Beverly Hills, California 90211. Mr. Hennessy's address is 500 Island Drive, 
Palm Beach, Florida 33480. Mr. Raubenheimer's address is c/o Folsom's Air 
Service, Burnt Jacket Road, Greenville, Maine 04441. Mr. Rutland's address is 
2625 Acuna Court, Carlsbad, California 92009. 

          (c)  The present principal business of HealthMed, Inc. is providing 
consulting services to healthcare companies.  The present principal business 
of National is serving as a holding Company. The Trust is an irrevocable 
trust created under the laws of California on January 16, 1998. The Trust was 
formed with the stock of National. The present principal occupation of Mr. 
Stein is President and Chief Executive Officer of HealthMed, Inc. The present 
principal occupation of Mr. Hennessy is investments. The present principal 
occupation of Mr. Raubenheimer is investments.  The present principal 
occupation of Mr. Rutland is serving as Chairman of the Board of Directors 
and Chief Executive Officer of Taipan Corporation and serving as a member of 
the Board of Directors of Hemet Federal Bank.

          (d)  During the past five years none of the Reporting Persons and, 
to the best knowledge of the Reporting Persons, none of the executive 
officers, directors, trustees or controlling persons of HealthMed, Inc. has 
been convicted in a criminal proceeding (excluding traffic violations or 
similar misdemeanors).

          (e)  None of the Reporting Persons, and, to the best knowledge of 
the Reporting Persons, none of the executive officers, directors, trustees or 
control persons of HealthMed, Inc. has, during the last five years, been a 
party to a civil proceeding or subject to 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.

                                       9

<PAGE>

ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

      Pursuant to the terms of a Stock Purchase Agreement dated January 12, 
1998 by and between David H. Katz, M.D. ("Dr. Katz") and HealthMed, Inc. (the 
"Katz Stock Purchase Agreement"), Dr. Katz sold 308,100 shares of Class A 
Common Stock and 70,200 shares of Class B Common Stock, no par value of the 
Company (the "Class B Common Stock")to HealthMed, Inc. for a total purchase 
price of $1,528,234.98 (the "Katz Promissory Note").  The purchase price was 
paid by the HealthMed, Inc. in the form of a promissory note in the principal 
amount of $1,528,234.98.  Said promissory note matures on January 12, 2000.

      Pursuant to the terms of a Stock Purchase Agreement dated January 12, 
1998 by and between Medical Biology Institute, a California nonprofit public 
benefit corporation ("MBI") and HealthMed, Inc. (the "MBI Stock Purchase 
Agreement"), MBI sold 65,100 shares of Class A Common Stock to HealthMed, 
Inc. for a total purchase price of $263,004.  The purchase price was paid by 
HealthMed, Inc. in the form of a promissory note in the principal amount of 
$263,004 (the "MBI Promissory Note").  Said promissory note matures on 
January 12, 2000.

ITEM 4.  PURPOSE OF TRANSACTION

      The Reporting Persons purchased the Shares owned by each of them for 
purposes of investment and for the purposes otherwise specified hereinbelow 
in this Item 4.  Subject to applicable legal and contractual requirements, 
and depending upon their respective evaluations of the Company's business and 
prospects, future developments, market conditions and other factors, any of 
the Reporting Persons may, from time to time, purchase additional Shares or 
sell or cause to be sold, all or a portion of these Shares for which the 
Reporting Person exercises voting or dispositive power, either in open market 
or privately negotiated transactions or otherwise.

      Subject to the foregoing, the Reporting Persons have no plans or 
proposals which relate to Items 4(a) through (j) of Schedule 13D except as 
follows: 

          (a)-(c)  Pursuant to the terms of a Settlement Agreement (the 
"Settlement Agreement") dated as of March 24, 1998 (the "Effective Date") by 
and among the Company, on the one hand, and all of the Reporting Persons, 
other than National and the Trust, on the other hand (collectively, the 
"HealthMed Parties"), each of the HealthMed Parties agreed, among other 
things, that they would not engage in any of the following activities at any 
time on or prior to the Company's annual meeting of shareholders in 2001:

              (I)  acquire, offer to acquire or agree to acquire additional 
securities issued by the Company or any of its direct or indirect 
subsidiaries, including Shares and any other debt or equity securities of the 
Company or any direct or indirect subsidiaries that are outstanding as of the 
Effective Date or may thereafter be issued ("LIDAK Securities"), other than 
LIDAK Securities that such person beneficially owns as of the Effective Date, 
or encourage any person to acquire, or advise any person with respect to the 
acquisition or proposed acquisition of LIDAK Securities other than attempts 
to dispose of such aforementioned LIDAK Securities that such person 
beneficially owns as of the Effective Date.  The above prohibitions do not 
apply to (A) acquisitions resulting from stock splits, reverse stocks splits 
or other reclassifications affecting outstanding LIDAK Securities or stock 
dividends or other pro rata distributions by the Company, (B) Messrs. 
Rutland, Hennessy and Raubenheimer; (C) HealthMed, Inc. if the Company 
approves a financing proposal by HealthMed, Inc.; (D) the ability of 
HealthMed, Inc. to acquire additional LIDAK Securities to maintain its 
percentage ownership interest in the Company and (E) the ability of 
HealthMed, Inc. to acquire shares pursuant to the Purchase Rights Agreement 
(as hereinafter defined);

              (II)  sell or otherwise convey (either singly or collectively) 
more than 5% of the Company's then current outstanding securities to a single 
person or group unless such person or group agrees in writing to be bound by 
the provisions of the Settlement Agreement; 

              (III) deposit any LIDAK Securities in a voting trust or subject 
them to a voting agreement or other agreement or arrangement of similar 
effect; and

              (IV)  engage in, or offer, agree or propose to engage in any 
business combination involving the Company, including without limitation an 
acquisition, merger, sign-off, consolidation, tender offer, share exchange or 
exchange offer (collectively, a "Transaction"); or arrange, or in any way 
participate in any financing for any Transaction or for the purchase by any 
person of any LIDAK Securities or any assets of the Company; PROVIDED, 
HOWEVER, that the above provision does not prevent any of the HealthMed 
Parties from making nonpublicly disclosed financing or investment proposals 
to the Company's Board of Directors or tendering LIDAK Securities 
beneficially owned by such person to any person who may make a tender offer 
for all outstanding LIDAK Securities of such class.

          (d) and (g)  Pursuant to the terms of the Settlement Agreement, the 
Company agreed to nominate Edward L. Hennessy, Jr. and George P. Rutland to 
its Board of Directors at the Company's 1998 Annual Shareholders Meeting (the 
"Annual Meeting").  In addition, the Company agreed to appoint a search 
committee (the "Search Committee") consisting of Ken Olson (or his nominee) 
and George P. Rutland to identify and recruit within 20 calendar days from 
the Effective Date, three independent directors (each, an "Independent 
Nominee") willing to join the Company's Board of Directors, at least one of 
whom has significant experience within the pharmaceutical industry.

     Further, the Company has agreed to submit for action at the Company's 
Annual Meeting the following proposals:

          (I)  the adoption of an amendment to Article III of the Company's 
Bylaws expanding the authorized number of directors to a minimum of 5 and 
maximum of 9.

          (II)  the adoption of an amendment to Article III of the Company's 
Bylaws creating three classes of directors, with Class I serving an initial 
term until the 1999 Annual Meeting, Class II serving an initial term until 
the 2000 Annual Meeting and Class III serving an initial term until the 2001 
Annual Meeting with the initial terms for all classes to be followed by full 
three year terms for each such class.

          (III) the reconstitution of the existing Board of Directors and the 
election of the following persons, as necessary, into the following Classes:

              Class I:    David H. Katz; 1 incumbent director; and 1 Independent
                          Nominee;

              Class II:   Edward L. Hennessy, Jr.; 1 incumbent director; and 1 
                          Independent Nominee;

              Class III:  George P. Rutland; 1 incumbent director; and 1 
                          Independent Nominee.

     Pursuant to the Settlement Agreement the parties thereto also agreed to 
vote all Shares beneficially owned by them or as to which they have the right 
to vote in favor of the bylaw amendments and board nominees referred to 
above.  In addition, the HealthMed Parties have agreed to withdraw the Proxy 
Statement previously filed by them immediately upon the filing by the Company 
of its Supplemental Proxy.

          (e)  On January 13, 1998, HealthMed, Inc. submitted a financing 
proposal to the Company.  On March 3, 1998, as a result of the Company's 
unwillingness to seriously pursue such proposal, HealthMed, Inc. withdrew its 
proposal.

          (f)  Not Applicable.

                                       10

<PAGE>

          (h)  Not Applicable.

          (i)  Not Applicable.

          (j)  Not Applicable.


ITEM 5.   INTEREST IN SECURITIES OF THE ISSUER.

          (a) HealthMed, Inc. is the direct beneficial owner of 443,400 
Shares. Further, HealthMed, Inc. has voting power over an additional 
1,034,603 Shares pursuant to the terms of Voting Trust Agreements with Dr. 
Katz and MBI (see below).  Further, HealthMed, Inc. has the right to acquire 
between 709,380 and 722,421 Shares from Dr. Katz pursuant to the terms of the 
Purchase Rights Agreement (as hereinafter defined). (For purposes hereof, as 
described hereinbelow, HealthMed, Inc. is utilizing the 722,421 Shares in 
calculating its beneficial ownership). Accordingly, HealthMed, Inc. may be 
deemed to beneficially own approximately 2,200,424 Shares (the "HealthMed 
Shares") (utilizing 722,421 Shares), representing approximately 5.4% of the 
Shares outstanding. Mr. Stein, as president, chief executive officer and a 
director of HealthMed, Inc. may be deemed to be beneficial owner of the 
HealthMed Shares, although he disclaims beneficial ownership of such shares. 
National, as the sole shareholder of HealthMed, Inc. may be deemed to be 
beneficial owner of the HealthMed Shares, although it disclaims beneficial 
ownership of such shares. The Trust, as the sole shareholder of National, may 
be deemed to be beneficial owner of the HealthMed Shares, although it 
disclaims beneficial ownership of such shares. Moreover, HealthMed, Inc. may 
be deemed to have an interest in the following (i) 1,918,400 shares 
(according to the Purchase Rights Agreement, or 1,877,000 according to 
information subsequently provided by, or on behalf of, Dr. Katz) issuable to 
Dr. Katz upon the exercise of currently exercisable stock options for which 
HealthMed, Inc. will have the right to vote pursuant to the Katz Voting Trust 
Agreement (as hereinafter defined), (ii) 386,190 shares issuable to Dr. Katz 
upon the exercise of Class D warrants that are currently exercisable for 
which HealthMed, Inc. will have the right to vote pursuant to the Katz Voting 
Trust Agreement; and (iii) 375,000 shares of Class B Common Stock issuable 
upon exercise of currently exercisable stock options (which automatically 
convert into 375,000 shares of Class A Common Stock among, other things, any 
transfer of such shares) for which HealthMed, Inc. will have the right to 
vote pursuant to the Katz Voting Trust Agreement. HealthMed, Inc. is not 
currently deemed to be the beneficial owner of such shares because HealthMed, 
Inc. has no control over whether Dr. Katz will exercise the above-described 
options and warrants. However, if Dr. Katz does exercise such options and 
warrants, HealthMed, Inc. will be deemed to be the beneficial owner of such 
shares.

          The percentage of Shares outstanding reported as beneficially owned 
by HealthMed, Inc. on the date hereof is based upon information contained in 
the Company's definitive Proxy Statement dated March 13, 1998 so that 
HealthMed, Inc.'s information is that the total shares of Class A Common 
Stock issued and outstanding as of February 20, 1998 was 39,805,850 shares of 
Class A Common Stock.  The calculation as to percentage ownership gives 
effect to (i) the automatic conversion of the 234,000 shares of Class B 
Common Stock of the Company into 234,000 Shares of Class A Common Stock upon 
the transfer of such Shares as required by the Company's Restated Articles of 
Incorporation (the "Articles") and (ii) the exercise by Dr. Katz of options 
to acquire up to 1,918,400 shares of Class A Common Stock and 375,000 shares 
of Class B Common Stock, aggregating 2,293,400, HealthMed, Inc.'s right to 
acquire 31.5% of such shares representing an aggregate of 591,255 shares of 
Class A Common Stock and 118,125 shares of Class B Common Stock, aggregating 
722,421 Shares and the automatic conversion of the 118,125 shares of Class B 
Common Stock into 118,125 shares of Class A Common Stock, and results, for 
purposes of calculating the percent of class owned by HealthMed, Inc., in 
there being 40,762,271 shares of Class A Common Stock issued and outstanding.

                                       11

<PAGE>

          Mr. Hennessy is the beneficial owner of 50,000 Shares. Mr. Hennessy 
has sole voting and investment power over all such Shares. Accordingly, Mr. 
Hennessy may be deemed to beneficially own approximately 0.1% of the Shares 
outstanding.

          Mr. Raubenheimer is the beneficial owner of 618,702 Shares.  Mr. 
Raubenheimer has sole voting and investment power over 144,134 Shares.  Mr. 
Raubenheimer's wife is the beneficial owner of 367,900 Shares.  Mr. 
Raubenheimer disclaims beneficial ownership of such shares.  Further, Mr. 
Raubenheimer is the beneficial owner of Class D warrants exercisable into 
106,668 Shares. Accordingly, Mr. Raubenheimer may be deemed to beneficially 
own approximately 1.6% of the Shares outstanding.

          Mr. Rutland is the beneficial owner of 100,000 Shares, of which he 
has sole voting and investment power over 88,000 shares and shared voting and 
investment power, with his wife, over 12,000 Shares.  Accordingly, Mr. 
Rutland may be deemed to beneficially own approximately 0.2% of the Shares 
outstanding.

          The percentage of Shares outstanding reported as beneficially owned 
by Messrs. Raubenheimer and Rutland on the date hereof is based upon the 
Company's Form 10-K for the Fiscal Year Ended September 30, 1997 which 
reported that the total shares of Class A Common Stock issued and outstanding 
as of December 29, 1997 was 38,742,511 Shares.  The calculation as to 
percentage ownership for Mr. Raubenheimer gives effect to the exercise by Mr. 
Raubenheimer of the Class D warrants owned to him.

          As described in detail in response to Item 6, below, the Reporting 
Persons may be regarded as a group and that group may be deemed to have 
acquired beneficial ownership for purposes of Sections 13(d) and 13(g) of the 
Exchange Act, of all Shares beneficially owned by the Reporting Persons.

          (b) HealthMed, Inc. has sole voting and dispositive power with 
respect to the 443,400 Shares of Class A Common Stock purchased pursuant to 
the Katz Stock Purchase Agreement and the MBI Stock Purchase Agreement.

          Pursuant to the terms of a Voting Trust Agreement dated January 12, 
1998 by and between Dr. Katz and HealthMed, Inc. (the "Katz Voting Trust 
Agreement"), Dr. Katz transferred 718,903 shares of Class A Common Stock and 
163,800 shares of Class B Common Stock (which automatically converted into 
163,800 shares of Class A Common Stock) into a voting trust with HealthMed, 
Inc. HealthMed, Inc. is the trustee of such voting trust and has the sole 
power to vote the 1,034,603 Shares transferred into such voting trust.  The 
term of the Katz Voting Trust Agreement is ten (10) years.  Under the terms 
of the Katz Voting Trust Agreement, Dr. Katz has retained the power to 
dispose of all of the Shares held in such trust; PROVIDED, HOWEVER, Dr. Katz 
may not dispose of more than twenty percent (20%) of such Shares within any 
thirty (30) day period. Further, pursuant to the Katz Voting Trust Agreement, 
Dr. Katz is obligated to transfer into such voting trust other or additional 
Shares that are issued by the Company to Dr. Katz, including, without 
limitation, through the exercise of stock options or warrants (including the 
stock options and warrants described in Item 5(a) above).

          Pursuant to the terms of a Voting Trust Agreement dated January 12, 
1998 by and between MBI and HealthMed, Inc. (the "MBI Voting Trust 
Agreement"), MBI transferred 151,900 Shares of Class A Common Stock into a 
voting trust with HealthMed, Inc.  HealthMed, Inc. is the trustee of such 
voting trust and has the sole power to vote the 151,900 Shares of Class A 
Common Stock transferred into such voting trust.  The term of the MBI Voting 
Trust Agreement is ten (10) years.  Under the terms of the MBI Voting Trust 
Agreement, MBI has retained the power 

                                       12

<PAGE>

to dispose of all of the Shares held in such trust; PROVIDED, HOWEVER, MBI 
may not dispose of more than twenty percent (20%) of such Shares within any 
thirty (30) day period.  Further, pursuant to the MBI Voting Trust Agreement, 
MBI is obligated to transfer into such voting trust other or additional 
shares that are issued by the Company to MBI, including, without limitation, 
through the exercise of stock options or warrants.  Dr. Katz may be deemed to 
be the beneficial owner of the 151,900 shares of Class A Common Stock 
transferred into this voting trust.

          Dr. Katz and HealthMed, Inc. have also entered into a Purchase 
Rights Agreement (the "Purchase Rights Agreement") dated January 12, 1998 
pursuant to which Dr. Katz has granted to HealthMed, Inc. the irrevocable 
right to receive either (i) 31.5% of the shares received by Dr. Katz upon the 
exercise of his stock options (the "Options") to purchase 1,918,400 shares of 
Class A Common Stock and 375,000 shares of Class B Common Stock or (ii) 31.5% 
of the net proceeds from the sale of the shares received upon exercise of the 
Options. The Purchase Rights Agreement expires on June 21, 2007.  The Options 
are exercisable within 60 days.  Accordingly, HealthMed, Inc. may be deemed 
to beneficially own 722,421 shares of Class A Common Stock.

          (c)  Edward L. Hennessy, Jr. purchased 50,000 Shares in the open 
market on March 18, 1998. Mr. Hennessy paid an aggregate of $97,882.98 
(inclusive of commissions) for such Shares or approximately $1.96 per Share. 
Such purchase was effected in the open market on the NASDAQ National Market 
System through a broker.

          (d)  Pursuant to the terms of the Purchase Rights Agreement, Dr. 
Katz has the right to exercise the Options, to sell the shares of stock 
received upon such exercise and either (i) to retain 68.5% of the net 
proceeds from the sale of such shares or (ii) to retain 68.5% of the shares 
received upon exercise of the Options.

                                       13

<PAGE>

          (e)  Not Applicable.

ITEM 6.   CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT
          TO SECURITIES OF THE ISSUER

          The discussion contained in each of Item 3, Item 4, Item 5(a) and Item
5(b) of this Schedule 13D is hereby incorporated herein by this reference.

          On March 6, 1998, the Reporting Persons (other than Mr. Hennessy) 
orally agreed to act together with respect to the Shares as and to the extent 
set forth below. Pursuant to the Settlement Agreement, Mr. Hennessy may also 
be deemed to act together with the other Reporting Persons with respect to 
the Shares beneficially owned by him. Moreover, pursuant to the terms of a 
Joint Filing Agreement, the Reporting Persons have agreed to the joint filing 
of this Statement on Schedule 13D (including any and all amendments) with 
respect to the Shares.  A copy of the Joint Filing Agreement is attached 
hereto as Exhibit 10.  Consequently, the Reporting Persons may be regarded as 
a group and that group may be deemed to have acquired beneficial ownership, 
for purposes of Sections 13(d) and 13(g) of the Exchange Act, of all Shares 
owned by any of the Reporting Persons.

          Except as set forth in Item 5(a) and Item 5(b) of this Schedule 
13D, HealthMed, Inc. has no power to vote or direct the voting of, nor any 
power to dispose of or direct the disposition of, the Shares owned by any 
other Reporting Person.  Consequently, HealthMed, Inc. disclaims any 
beneficial interest in the Shares owned by any other Reporting Person.

          Except as set forth in Item 5(a) and Item 5(b) of this Schedule 
13D, neither Mr. Stein, National or the Trust has the power to vote or direct 
the voting of, nor any power to dispose of or direct the disposition of, the 
Shares owned by any other Reporting Person. Consequently, each of Mr. Stein, 
National and the Trust disclaims any beneficial interest in the Shares owned 
by any other Reporting Person.

          Mr. Hennessy has no power to vote or direct the voting of, nor any 
power to dispose of or direct the disposition of, the Shares owned by any 
other Reporting Person. Consequently, Mr. Hennessy disclaims any beneficial 
interest in the Shares owned by any other Reporting Person.

          Mr. Raubenheimer has no power to vote or direct the voting of, nor 
any power to dispose of or direct the disposition of the Shares owned by any 
other Reporting Person.  Consequently, Mr. Raubenheimer disclaims any 
beneficial interest in the Shares owned by any other Reporting Person.

          Mr. Rutland has no power to vote or direct the voting of, nor any 
power to dispose of or direct the disposition of, the Shares owned by any 
other Reporting Person.  Consequently, Mr. Rutland disclaims any beneficial 
interest in the Shares owned by any other Reporting Person.

          Pursuant to the Settlement Agreement, the Company has agreed to 
reimburse HealthMed, Inc. for certain third party expenses, not to exceed 
$150,000, in connection with the proxy statement previously filed by the 
Reporting Persons.

          As previously reported in earlier filings, and referred to herein, 
HealthMed Inc. entered into various agreements with Dr. Katz and MBI on 
January 12, 1998 regarding purchase of shares and voting trust. It has come 
to HealthMed's attention that Dr. Katz has asserted that the purpose of those 
agreements was to induce HealthMed, Inc. to invest $130 million dollars into 
Lidak. Said statement of purpose is erroneous, and is nowhere reflected in 
the written documents which created the purchase and sale and the voting 
trust. It is also contrary to the facts surrounding the entering into of 
these agreements. Dr. Katz is not a Reporting Person pursuant to this 
Schedule 13D, and is not a member of any group with HealthMed, Inc. except as 
evidenced by the written agreements of January 12, 1998.

          Except as set forth above, the Reporting Persons disclaim the 
existence of any group, in which any of them may be deemed to be a member, 
relative to the ownership of any securities of the Company.  Moreover, except 
as set forth in this Schedule 13D (particularly in response to Item 4, which 
discussion is hereby incorporated herein by this reference), none of the 
Reporting Persons has any contracts, arrangements, understandings, or 
relationships (legal or otherwise) with any other person with respect to any 
securities of the Company, including without limitation, transfer or voting 
of any securities of the Company; finder's fees; joint ventures; loan or 
option arrangements; puts or calls; guarantees of profits; divisions of 
profits or losses; or the giving or withholding of proxies.  

                                       14

<PAGE>

ITEM 7.   MATERIAL TO BE FILED AS EXHIBITS

      Exhibit 10:    Joint Filing Agreement among the Reporting Persons pursuant
                     to Rule 3d-1(f)(1)(iii).

      Exhibit 11:    Settlement Agreement

      Exhibit 12:    Press Release


                                       15

<PAGE>

                                       ANNEX I



      The name and principal occupation and employment of each executive 
officer and director of HealthMed, Inc., each person controlling HealthMed, 
Inc. and each executive officer and director of each person controlling 
HealthMed, Inc. is set forth below.   The address of each such person is c/o 
HealthMed, Inc., 8306 Wilshire Boulevard, Suite 7056, Beverly Hills, 
California 90211.  Each person listed below is a citizen of the United States 
of America.

      The executive officers and directors of HealthMed, Inc. are as follows:


Name                               Present Principal Occupation and Employer
- -----                              -----------------------------------------
Mitchell J. Stein (1)              President, Chief Executive Officer, Chief
                                   Financial Officer, Secretary and Director

T. Daniel Neveau                   Vice President-Development and Director


      The outstanding capital stock of HealthMed, Inc. is held by National 
Trust Properties, Inc., an Arizona corporation ("National").  The executive 
officers and directors of National are as follows:

Name                               Present Principal Occupation and Employer
- -----                              -----------------------------------------

Mitchell J. Stein (1)              President, Secretary and Director

Tracey Hampton                     Chief Financial Officer

Dennis Hawk (1)                    Director


      The outstanding capital stock of National is owned by The Trammel Trust 
(the "Trust") which was formed in the State of California on January 16, 
1998. The sole trustee of the Trust is Emanuel Barling, Jr.

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

(1)    Messrs. Stein and Hawk are also partners in the law firm of
Stein, Perlman & Hawk which is located at 9000 Sunset Boulevard, Suite 500, Los
Angeles, California 90069.

                                       16

<PAGE>

                                      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: March 31, 1998



                                       HEALTHMED, INC.



                                       By:  /s/ Mitchell J. Stein
                                            ---------------------------------
                                             Name: Mitchell J. Stein
                                             Title: President




                                       17

<PAGE>

                                      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: March 31, 1998



                                       NATIONAL TRUST PROPERTIES, INC.



                                       By:  /s/ Mitchell J. Stein
                                            ---------------------------------
                                             Name: Mitchell J. Stein
                                             Title: President




                                       18
<PAGE>

                                      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: March 31, 1998



                                       THE TRAMMEL TRUST



                                       By:  /s/ Emanuel Barling, Jr.
                                            ---------------------------------
                                             Name: Emanuel Barling, Jr.
                                             Title: Trustee




                                       19

<PAGE>

                                      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: March 31, 1998




                                       /s/ Mitchell J. Stein
                                       ----------------------------------------
                                       Mitchell J. Stein


                                       20
<PAGE>

                                      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: March 29, 1998




                                       /s/ Edward L. Hennessy, Jr.
                                       ----------------------------------------
                                       Edward L. Hennessy, Jr.


                                       21

<PAGE>

                                      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: March 28, 1998







                                       /s/ Wallace O. Raubenheimer
                                       ----------------------------------------
                                       Wallace O. Raubenheimer


                                       22

<PAGE>

                                      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: March 29, 1998







                                       /s/ George P. Rutland
                                       ----------------------------------------
                                       George P. Rutland

                                       23


<PAGE>

                                                                    EXHIBIT 10

                                JOINT FILING AGREEMENT


      Agreement among HealthMed, Inc., National Trust Properties, Inc., 
Mitchell J. Stein, The Trammel Trust, Edward L. Hennessy, Jr., Wallace O. 
Raubenheimer and George P. Rutland, whereby in accordance with Rule 13d-1(f) 
under the Securities Exchange Act of 1934, as amended, each of the persons 
named below agrees to the joint filing on behalf of each of them of a 
Statement on Schedule 13D with respect to the equity securities of Lidak 
Pharmaceuticals and further agrees that this Joint Filing Agreement be 
included as an exhibit to such joint filings provided that, as contemplated 
by section 13D-1(f)(2)(ii), no person shall be responsible for the 
completeness or accuracy of the information concerning the other persons 
making the filing, unless such person knows or has reason to believe that 
such information is inaccurate.

      In evidence thereof the undersigned, being duly authorized, hereby 
execute this Agreement in counterpart as of this 31st day of March, 1998.

                         HEALTHMED, INC.


                         By: /s/ Mitchell J. Stein 
                             -----------------------------------------
                             Name:  Mitchell J. Stein
                             Title: President

                         NATIONAL TRUST PROPERTIES, INC.


                         By: /s/ Mitchell J. Stein 
                             -----------------------------------------
                             Name:  Mitchell J. Stein
                             Title: President


                         THE TRAMMEL TRUST


                         By: /s/ Emanuel Barling, Jr. 
                             -----------------------------------------
                             Name:  Emanuel Barling, Jr.
                             Title: Trustee



                             /s/ Mitchell J. Stein
                             -----------------------------------------
                             Mitchell J. Stein



                             /s/ Edward L. Hennessy, Jr.
                             -----------------------------------------
                             Edward L. Hennessy, Jr.



                             /s/ Wallace O. Raubenheimer
                             -----------------------------------------
                             Wallace O. Raubenheimer



                             /s/ George P. Rutland
                             -----------------------------------------
                             George P. Rutland

                                       20


<PAGE>


                       AGREEMENT OF COMPROMISE AND SETTLEMENT


          This AGREEMENT OF COMPROMISE AND SETTLEMENT dated as of March 24, 
1998 (this "Settlement Agreement") is entered into by and among LIDAK 
Pharmaceuticals ("LIDAK"), a California corporation, on the one hand, and 
HealthMed, Inc., a Nevada Corporation ("HealthMed"), Mitchell J. Stein 
("Stein"), George P. Rutland ("Rutland"), Edward L. Hennessy, Jr. 
("Hennessy"), and Wallace O. Raubenheimer ("Raubenheimer") (collectively the 
"HealthMed Parties") on the other hand.  The foregoing parties are sometimes 
collectively referred to herein as the "Parties."

          WHEREAS, LIDAK has scheduled its 1998 Annual Meeting of 
Shareholders for April 18, 1998;

          WHEREAS, LIDAK has issued a Proxy Statement presenting for action 
at the 1998 Annual Meeting the election of Messrs. William N. Jenkins, Helmer 
P.K. Agersborg and Stuart A. Samuels as directors;

          WHEREAS,  the HealthMed Parties have filed a Schedule 13D and Proxy 
Statement announcing their intent to contest the election of the LIDAK slate 
of directors and have nominated a slate consisting of Edward L. Hennessy, 
Jr., George P. Rutland and Wallace O. Raubenheimer; 

          WHEREAS, the Parties desire to avoid the costs and expenses of a 
protracted and divisive proxy contest and related litigation; and

<PAGE>

          WHEREAS, LIDAK has determined that the agreements set forth herein 
are in the best interests of LIDAK and its shareholders.

          FOR AND IN CONSIDERATION of the mutual covenants contained herein, 
the Parties, intending to be legally bound hereby, agree as follows:

          1.   CERTAIN DEFINED TERMS.  As used in this Settlement agreement, 
the following terms (whether or not capitalized) shall have the following 
meanings:

               "1998 ANNUAL MEETING" means the 1998 annual meeting of 
shareholders of LIDAK at which the election of directors shall be considered.

               "BOARD" means the Board of Directors of LIDAK.

               "COMMON STOCK" means the Class A and Class B common stock, no par
value per share, of LIDAK.

               "EFFECTIVE DATE" means March 24, 1998.

               "EXCHANGE ACT" means the Securities Exchange Act of 1934, as
amended.

               "LIDAK SECURITIES" means any securities issued by LIDAK or any 
of its direct or indirect subsidiaries, including the Common Stock and any 
other debt or equity securities of LIDAK or any of its direct or indirect 
subsidiaries that are outstanding as of the date hereof or may hereafter be 
issued.

               "PERSON" means any individual, corporation, association, 
general or limited partnership, limited liability company, limited liability 
partnership, joint venture, trust, estate, other entity or organization or 
group.


                                       2

<PAGE>

               "SCHEDULE 13D" means the Statements on Schedule 13D related to 
LIDAK Securities and filed with the SEC on or about January 13, 1998 by any 
or all of the HealthMed Parties, and amendments thereto filed prior to the 
Effective Date.

               "SEC" means the United States Securities and Exchange 
Commission.

               "SECURITIES ACT" means the Securities Act of 1933, as amended.

               "SOLICITATION ACTION" with respect to a shareholders' meeting 
means any of the following: (i) giving notice pursuant to LIDAK's Bylaws of 
an intention to nominate directors at such meeting; (ii) filing with the SEC 
any proxy solicitation materials (whether preliminary, definitive or as 
described in Rule 14a-11 or 14a-12 under the Exchange Act) with respect to 
such meeting; (iii) mailing or otherwise disseminating to shareholders any 
such solicitation materials; (iv) otherwise engaging in a solicitation of 
proxies with respect to such meeting; (v) nominating at such meeting 
candidates for election as directors except as provided herein; or (vi) 
casting votes or ballots at such meeting pursuant to proxies so solicited 
(but the term "Solicitation Action" shall not include the casting of votes or 
ballots by the Parties with respect to shares of Common Stock beneficially 
owned by them or which are the subject of voting trusts over which they have 
control).

               "TRANSACTION" means any business combination involving LIDAK, 
including without limitation an acquisition, merger, spin-off, spin-out, 
consolidation, tender offer, share exchange or exchange offer.

               "VOTING SECURITIES" means any securities issued by LIDAK or 
any of its direct or indirect subsidiaries, including the Common Stock and 
any other equity securities or 

                                       3

<PAGE>

debt convertible into equity securities of LIDAK or any of its direct or 
indirect subsidiaries that are outstanding as of the date hereof or may 
hereafter be issued.

               The terms "PARTICIPANT," "PROXY" and "SOLICITATION" shall be 
used as defined in Regulation 14A under the Exchange Act (whether or not the 
pertinent securities are subject to Regulation 14A).  The terms "BENEFICIAL 
OWNERSHIP" and "GROUP" shall be used as defined in Regulation 13D-G under the 
Exchange Act.  The terms "AFFILIATE" and "ASSOCIATE" shall be used as defined 
in Rule 12b-2 under the Exchange Act.

          2.   REPRESENTATIONS AND WARRANTIES OF THE HEALTHMED PARTIES.  Each 
of the HealthMed Parties severally and not jointly, represents and warrants 
to LIDAK as follows:

               (a)  Such HealthMed Party has the requisite legal power and 
authority to execute, deliver and carryout this Settlement Agreement and has 
taken all necessary legal action to authorize the execution, delivery and 
performance of this Settlement Agreement and the transactions contemplated 
hereby.

               (b)  This Settlement Agreement has been duly and validly 
authorized, executed and delivered by such HealthMed Party and constitutes a 
valid and binding obligation, enforceable against such HealthMed Party in 
accordance with its terms.

               (c)  Neither such HealthMed Party nor any of its affiliates 
beneficially owns, or has any direct, indirect or contingent pecuniary 
interest in, any LIDAK Securities other than as disclosed in the Schedule 
13D, except for 50,000 shares owned by Hennessy which were purchased on or 
about March 18, 1998. Except for the aforementioned purchase of 50,000 shares 
by Hennessy, none of the HealthMed Parties, individually or in the aggregate, 
have filed any amendment or taken any action that requires filing an 
amendment to the Schedule 13D 

                                       4

<PAGE>

during the period from March 6, 1998 (the last amendment date) to and 
including the Effective Date.

               (d)  Neither such HealthMed Party nor any of its affiliates is 
a member of any group with respect to LIDAK Securities and there are no other 
persons who are part of such a group with it or any of its affiliates except 
as disclosed in the Schedule 13D.

               (e)  Such HealthMed Party is not committed to or intending to 
take any action designed to restore David Katz as an officer, consultant or 
employee of LIDAK nor to nominate or elect David Katz as a director of LIDAK.

               (f)  No action or proceeding has been filed by any of the 
HealthMed Parties in any court or with any administrative body relating to 
any action by LIDAK or its affiliates.

               (g)  There are, and have been, no undisclosed agreements or 
undertakings regarding compensation or remuneration of any kind to Messrs. 
Rutland, Raubenheimer or Hennessy.

               (h)  There have been no commitments by Messrs. Rutland, 
Raubenheimer or Hennessy to any HealthMed financing or investment proposal 
concerning LIDAK.

               (i)  There are no undisclosed agreements between the HealthMed 
Parties and David H. Katz.

               (j)  None of the expenses incurred by the HealthMed Parties 
have been funded or reimbursed by David H. Katz.

                                       5

<PAGE>

          3.   REPRESENTATIONS AND WARRANTIES OF LIDAK.  LIDAK represents and 
warrants to the HealthMed Parties as follows:

               (a)  LIDAK is duly organized and validly existing and in good 
standing under the laws of the State of California, has the requisite 
corporate power and authority to execute, deliver and carry out this 
Settlement Agreement and has taken all necessary corporate action to 
authorize the  execution, delivery and performance of this Settlement 
Agreement and the transactions contemplated hereby.

               (b)  This Settlement Agreement has been duly and validly 
authorized, executed and delivered by LIDAK and constitutes a valid and 
binding obligation, enforceable against LIDAK in accordance with its terms.

               (c)  No action or proceeding has been filed by LIDAK or any of 
its affiliates in any court or with any administrative body relating to any 
action by any of the HealthMed Parties.

               (d)  During the period from the Effective Date until the 
conclusion of the 1998 Annual Meeting, subject to the fiduciary duties of the 
members of the LIDAK Board, LIDAK shall not engage in any extraordinary 
Transaction.  During that period, Rutland shall be given notice of all LIDAK 
Board meetings and invited to attend such meetings as an observer and to make 
his views known on any matters which come before the Board provided that 
Rutland signs a confidentiality agreement limiting the disclosure and use of 
any information obtained at such meetings. During that period LIDAK shall not 
enter into any employee retention agreements other than in the ordinary 
course of business and other than those agreements with certain executive 
management of LIDAK listed on Exhibit A, and the election of directors 

                                       6

<PAGE>

contemplated by paragraph 5(c) of this Agreement will not constitute a 
"change of control" as defined under such agreements.  Nothing contained 
herein shall preclude LIDAK from adopting a shareholder rights plan or 
indemnification agreements for its officers or directors.

          4.   RESTRICTIONS ON PURCHASE AND SALE OF LIDAK SECURITIES AND 
CERTAIN OTHER ACTIONS.  Each of the HealthMed Parties agrees that it and its 
respective affiliates shall not, without the prior written consent of LIDAK 
at any time on or prior to the LIDAK's annual meeting of shareholders in 2001:

               (a)  acquire, offer to acquire or agree to acquire, directly 
or indirectly, by purchase or otherwise, beneficial ownership of LIDAK 
Securities (or any direct or indirect rights, options or warrants for any 
LIDAK Securities), other than the LIDAK Securities that such Person 
beneficially owns as of the date hereof as referenced in Section 2(c) of this 
Settlement Agreement, or encourage any Person to acquire, or advise any 
Person with respect to the acquisition or proposed acquisition of LIDAK 
Securities other than attempts to dispose of such aforementioned LIDAK 
Securities that such Person beneficially owns as of the date hereof; provided 
however, that this paragraph 4(a) shall not apply to acquisitions resulting 
from stock splits, reverse stock splits or other reclassifications affecting 
outstanding LIDAK Securities or stock dividends or other pro rata 
distributions by LIDAK or its direct or indirect subsidiaries to holders of 
LIDAK Securities (or a class or classes thereof) or from exercise of any 
rights so distributed, nor shall it prohibit the HealthMed Parties or their 
affiliates from acquiring LIDAK Securities from LIDAK on terms generally 
available to all LIDAK shareholders; and provided further that this paragraph 
(a) shall not apply to Rutland, Hennessy and Raubenheimer; and provided 
further that in the event the LIDAK Board approves a financing proposal by 

                                       7

<PAGE>

HealthMed, HealthMed shall be entitled to purchase additional LIDAK 
Securities in an amount to be negotiated in connection with the approval of 
such financing proposal.  This paragraph 4(a) shall not preclude HealthMed 
from (i) acquiring additional LIDAK Securities subsequent to the Effective 
Date, but solely to the extent necessary to maintain the same percentage 
ownership interest in the outstanding Class A Common Stock of LIDAK at the 
time of such additional acquisition, as the percentage which HealthMed owns 
at the Effective Date or (ii) acquiring up to 709,380 shares of LIDAK Class A 
Common Stock upon the exercise of certain stock options by Dr. Katz, pursuant 
to the Purchase Rights Agreement dated January 12, 1998 between HealthMed and 
Katz, as described as of the date hereof in the Schedule 13D.

               (b)  sell or otherwise convey (either singly or collectively) 
more than 5% of LIDAK's then current outstanding Securities to a single 
Person or group unless such Person or group, and every member thereof, agrees 
in writing to be bound by the provisions of this Settlement Agreement;

               (c)  solicit, or encourage any other Person to solicit, or 
advise any Person with respect to the solicitation of proxies or consents 
with respect to any LIDAK Securities, or become a participant or otherwise 
engage in any solicitation of proxies or consents (A) with respect to any 
matter submitted or to be submitted to the vote of the holders of any LIDAK 
Securities at any annual or special meeting or by written consent, including, 
without limitation, with respect to the election of directors of LIDAK in 
opposition to the nominees recommended by the Board or otherwise for the 
purpose of acquiring control of the Board or management of LIDAK, or (B) for 
the purpose of calling a special meeting of LIDAK's shareholders or the 
holders of any LIDAK Securities; or advise or seek to advise any Person 

                                       8

<PAGE>

with respect to the voting of any LIDAK Securities; or submit, or encourage 
any other Person to submit, or advise or assist any Person with respect to 
the submission of, any nominations or proposals to LIDAK or to the holders of 
LIDAK Securities for consideration by its shareholders or the holders of any 
LIDAK Securities at any annual or special meeting of such holders or in any 
action to be taken by written consent pursuant to LIDAK charter or bylaws, 
Rule 14a-8 under the Exchange Act, the provisions of any document governing 
the terms of any such LIDAK Securities or governing the rights of the holders 
thereof, or otherwise; engage in any Solicitation Action; or otherwise take 
any action to request a special meeting of the holders of any LIDAK 
Securities;

               (d)  deposit any LIDAK Securities in a voting trust or subject 
them to a voting agreement or other agreement or arrangement of similar 
effect or otherwise join or form a partnership, limited partnership, 
syndicate or other group for the purpose of acquiring, holding, voting or 
disposing of any LIDAK Securities, except as to those LIDAK Securities held 
in voting trust as disclosed in the Schedule 13D and Amendment No. 1 thereto 
dated March 6, 1998;

               (e)  engage in, or offer, agree or propose to engage in, any 
Transaction (other than to participate therein as a shareholder on terms 
generally available to all of LIDAK's shareholders); or arrange, or in any 
way participate, directly or indirectly, in any financing for any Transaction 
or for the purchase by any person of any LIDAK Securities or any assets of 
LIDAK; PROVIDED, HOWEVER, that nothing herein shall prevent any of the 
HealthMed Parties from making nonpublicly disclosed financing or investment 
proposals to the LIDAK Board or tendering LIDAK securities beneficially owned 
by it to any person who may make a tender offer for all outstanding LIDAK 
securities of such class;

                                       9

<PAGE>

               (f)  otherwise act alone or in concert with others to seek 
representation on the Board or to acquire control of LIDAK or any of its 
securities or assets; 

               (g)  publicly request any amendment of any of the terms of 
this Section;

               (h)  support, encourage, or assist, directly or indirectly, 
LIDAK's employment, in any capacity, of David H. Katz or his appointment as 
an officer of LIDAK, or, except as otherwise provided herein, the nomination 
or election of David H. Katz as a director of LIDAK, subject to the fiduciary 
duties of any HealthMed Party who is a member of the LIDAK Board.

               (i)  assist or advise, or enter into any agreement or 
arrangement to assist or advise any other person in taking any action 
referenced in any of paragraphs (a) through (h) above.

               (j)  If the LIDAK Board invites offers from third parties for 
a Transaction that would result in a change of control of LIDAK, the 
HealthMed Parties shall not be restricted by the provisions of paragraph 4(a) 
and 4(e) hereof insofar as is necessary to permit the HealthMed Parties to 
compete on equal terms with any such third party.

          5.   ADDITIONAL AGREEMENTS.

               (a)  PRESS RELEASE.  Upon the effectiveness of this Agreement, 
LIDAK shall issue the press release attached hereto as Exhibit B.  No Party 
to this Settlement Agreement nor any of their respective affiliates, 
associates or representatives shall issue any other press release or other 
publicly available document concerning this Settlement Agreement that is 
inconsistent with, or is otherwise contrary to, the statements in such press 
release.  None of the 

                                       10

<PAGE>

Parties shall publicly make any negative statements regarding any other 
Party, the Board, the process by which LIDAK seeks to enhance shareholder 
value, or any proposed, pending or consummated Transaction.

               (b)  NON-INTERFERENCE.  Each of the Parties hereto agrees 
that, subject to his or its absolute right to pursue his or its own 
legitimate business objectives independently and in good faith, he or it will 
not, and will not permit any related party controlled by him or it, directly 
or indirectly to, take any action or encourage any other Person to take any 
action, the intent or direct foreseeable result of which is to interfere with 
or adversely affect the business activities, contractual relationships or 
business opportunities of any other Party or such other Party's affiliates 
and associates.

               (c)  BOARD COMPOSITION. 

               i.   Within 5 days after the Effective Date, LIDAK shall take 
all necessary action to (1) postpone the 1998 Annual Meeting in accordance 
with this Section 5(c), and (2) appoint and direct Ken Olson or his nominee 
and George P. Rutland as members of an AD HOC search committee (the "Search 
Committee") to identify and recruit within 20 calendar days three independent 
directors willing to join the LIDAK Board, at least one of whom has 
significant experience within the pharmaceutical industry (each, an 
"Independent Nominee"), although the Search Committee shall use its best 
efforts to identify and recruit  Independent Nominees who have significant 
experience within the pharmaceutical industry.  If the Search Committee is 
unable to reach agreement on three nominees to be reported to the LIDAK Board 
within the time period specified, within 3 business days after the expiration 
of such 20 day period the Parties shall jointly retain the Honorable Howard 
B. Wiener, retired, who shall select 

                                       11

<PAGE>

however many nominees to the LIDAK Board are necessary in order that three 
nominees are reported to the LIDAK Board.  Judge Wiener shall select nominees 
consistent with the Search Committee criteria set forth above in this Section 
5(c)(i) and shall not select nominees with familial or material, personal or 
business relationships with the parties, other directors or nominees, or 
their respective counsel.  Judge Wiener shall, as soon as practicable, after 
his retention, select and report to the LIDAK Board his nominees.  The cost 
of retaining Judge Wiener shall be borne equally by LIDAK, on the one hand, 
and HealthMed, on the other hand.  Any of the Parties may nominate persons to 
be considered by Judge Wiener for selection but Judge Wiener may disregard 
any such nomination and make his selection in any way he chooses.  Judge 
Wiener's decision shall be final and binding on the Parties.

               ii.  Within 3 business days after the Search Committee and/or 
Judge Wiener reports to the LIDAK Board that it has obtained the consent of 
three qualified Independent Nominees to serve on the LIDAK Board and LIDAK 
has received all information about these individuals and Rutland and Hennessy 
which is required for inclusion in the LIDAK supplemental Proxy Statement, 
LIDAK shall file with the SEC and, as promptly as practicable after the SEC 
has cleared such materials, distribute to its shareholders a supplemental 
Proxy Statement and proxy presenting for action at the 1998 Annual Meeting 
containing, along with any other proposals presented by the Board,  the 
following proposals:

                    (A)  The adoption of an amendment to Article III of LIDAK's
Bylaws expanding the authorized number of directors to a minimum of 5 and
maximum of 9.

                    (B)  The adoption of an amendment to Article III of 
LIDAK's 

                                       12

<PAGE>

Bylaws creating three classes of directors, with Class I serving an initial 
term until the 1999 Annual Meeting, Class II serving an initial term until 
the 2000 Annual Meeting and Class III serving an initial term until the 2001 
Annual Meeting, with the initial terms for all classes to be followed by full 
three year terms for each such Class.

                    (C)  The reconstitution of the existing Board of 
Directors and the election of the following persons, as necessary, into the 
following Classes:

                    Class I:  David H. Katz; 1 incumbent director; and 1 
Independent Nominee; 

                    Class II: Edward L. Hennessy, Jr.; 1 incumbent director 
and 1 Independent Nominee; and

                    Class III:     George P. Rutland; 1 incumbent director 
and 1 Independent Nominee.

                         iii. Promptly after the Search Committee and/or 
Judge Wiener has delivered its determination of the three Independent 
Nominees to the LIDAK Board, LIDAK will set a new record date and meeting 
date for the 1998 Annual Meeting, which meeting date shall be not later than 
60 days after the date the Search Committee and/or Judge Wiener reports its 
determination and provides the required information as described in clause 
5(c)(ii) above to the LIDAK Board.

                         iv.  The Parties hereto agree to vote all shares 
beneficially owned by them or as to which they have the right to vote 
pursuant to the provisions 

                                       13

<PAGE>

of any voting trusts or proxies at the 1998 Annual Meeting in favor of the 
bylaw amendments and the board nominees referred to in this paragraph 5(c).

               (d)  WITHDRAWAL OF HEALTHMED PROXY.  Immediately upon the 
filing by LIDAK of the Supplemental Proxy described above, the HealthMed 
Parties shall withdraw their Proxy Statement.

               (e)  IF PROPOSALS REJECTED.  In the event that the LIDAK 
Shareholders do not approve the proposals set forth in paragraph 5(c)(ii), 
the Parties are relieved of all of their obligations hereunder except that 
the Mutual Releases set forth in paragraph 6 shall continue to be effective 
and the amount paid by LIDAK to Diamond & Ostrow pursuant to paragraph 5(f) 
shall be returned to LIDAK.

               (f)  EXPENSE REIMBURSEMENT.  Within three days of the 
Effective Date, the HealthMed Parties shall submit to LIDAK a declaration 
under oath of Rex Beaber itemizing the third party out of pocket expenses 
incurred by the HealthMed Parties in connection with the filing of the 
HealthMed Proxy Statement and preparing to wage a proxy contest.  Within 
three days of receipt of such declaration, LIDAK shall pay an amount equal to 
75 percent of such expenses, with such payment not to exceed the amount of 
$150,000 to the law firm of Diamond & Ostrow who will hold such funds in 
trust until the conclusion of the 1998 Annual Meeting.  If the proposals set 
forth in paragraph 5(c)(ii) are adopted by the LIDAK Shareholders, such funds 
may be disbursed to HealthMed. The HealthMed Parties represent and warrant 
that none of such reimbursement will be paid to Katz or his counsel.  If the 
proposals set forth in paragraph 5(c)(ii) are not adopted, such funds will be 
returned to LIDAK.

                                       14

<PAGE>

               (g)  NO EMPLOYMENT OF KATZ.  Each of the HealthMed Parties 
agrees not to propose, encourage others to propose, or support in any way, 
directly or indirectly, the employment or appointment of David H. Katz by 
LIDAK, in any capacity, as an officer, employee or consultant of LIDAK, and 
agrees to vote against any such employment or appointment subject to the 
fiduciary duties of any such party who may be a member of the LIDAK Board.

               (h)  NO NOMINATION OF KATZ.  Except as otherwise set forth 
herein, each of the HealthMed Parties agrees not to nominate, encourage 
others to nominate, vote for the nomination of, or support in any way the 
nomination of, directly or indirectly, David H. Katz as a director of LIDAK, 
from the Effective Date until after the completion of the LIDAK annual 
meeting of shareholders in 2001, subject to any fiduciary duties of any such 
party who may be a member of the LIDAK Board.

          6.   MUTUAL RELEASES.  For and in consideration of the agreements 
contained herein, the Parties hereto release one another as follows:

               (a)  HEALTHMED PARTIES.  Each of the HealthMed Parties, on 
behalf of itself and of all its affiliates, successors and assigns other than 
David H. Katz ("related parties"), hereby releases, acquits and forever 
discharges LIDAK, together with its present and former affiliates, officers, 
directors, employees, agents, advisors, attorneys, successors and assigns 
(the "Released Parties"), of and from any and all claims, causes of action 
(whether at law or equity), demands, expenses and damages which such 
HealthMed Parties or its related parties may have had, or may now have, or 
may hereafter have (whether through operation of law, assignment or 
subrogation), from the beginning of time to the Effective Date, real or 
suspected, known or 

                                       15

<PAGE>

unknown, actual or contingent, direct or derivative, including but not 
limited to any such claims, cause of action, demands, expenses and damages 
relating to or arising out of any actions or inactions by LIDAK, its Board of 
Directors, its Executive Committee, its Special Committee or any of its 
officers, directors, employees, attorneys relating to consideration of the 
HealthMed proposal, the conduct of LIDAK's business, the submission of 
matters for consideration at the Annual Meeting, the filing of proxy 
materials with the SEC, or any other action or inaction relating thereto, 
excepting only any action, cause of action or suit arising by virtue of the 
breach of this Settlement Agreement.

               (b)  LIDAK.  LIDAK, on behalf of itself and all of its 
affiliates, successors and assigns ("related parties"), hereby releases, 
acquit and forever discharges the HealthMed Parties, together with their 
respective present and former affiliates, officers, directors, employees, 
agents, attorneys, successors and assigns, excluding David H. Katz, of and 
from any and all claims, causes of action (whether at law or equity), 
demands, expenses and damages which LIDAK may have had, or may now have, or 
may hereafter have (whether through operation of law, assignment or 
subrogation), from the beginning of time to the Effective Date, real or 
suspected, known or unknown, actual or contingent, direct or derivative, 
including but not limited to any such claims, causes of action, demands, 
expenses and damages relating to or arising out of any matters relating to 
the proposed HealthMed financing transaction, the filing of the Schedule 13D, 
the filing of the Proxy Statement or any other action or inaction related 
thereto excepting only any action, causes of action or suit arising by virtue 
of the breach of this Settlement Agreement.

                                       16

<PAGE>

With respect to each of the releases set forth above, each person or entity 
granting or receiving such a release (i) agrees that such releases do not 
preclude any Party hereto from seeking to enforce any undertaking or promise 
contained in this Settlement Agreement or from seeking redress for the breach 
of any representation or warranty contained in this Settlement Agreement; 
(ii) agrees not to challenge, and shall use its best efforts to cause each of 
its affiliates, associates and representatives not to challenge, the validity 
of any provisions of this Settlement Agreement; and (iii) expressly waives 
all rights and benefits each may have under and by virtue of the terms of 
Section 1542 of the California Civil Code, which provides as follows:

          A GENERAL RELEASE DOES NOT EXTEND TO CLAIMS WHICH THE
          CREDITOR DOES NOT KNOW OR SUSPECT TO EXIST IN HIS FAVOR AT
          THE TIME OF EXECUTING THE RELEASE, WHICH IF KNOWN BY HIM
          MUST HAVE MATERIALLY AFFECTED HIS SETTLEMENT WITH THE
          DEBTOR.

Except as may be otherwise required by law, the HealthMed Parties will not 
encourage or cooperate with plaintiffs in any derivative, class action or 
shareholder litigation related to the Released Parties.  Except as may be 
otherwise required by law, LIDAK will not encourage or cooperate with 
plaintiffs in any derivative, class action or shareholder litigation related 
to LIDAK to which any of the HealthMed Parties is a party.  In the event that 
any part of this Settlement Agreement is temporarily, preliminarily or 
permanently enjoined or restrained by a court of competent jurisdiction, the 
Parties hereto shall use their reasonable best efforts to cause 

                                       17

<PAGE>

any such injunction or restraining order to be vacated or dissolved or 
otherwise declared or determined to be of no further force or effect.

          7.   MISCELLANEOUS.

               (a)  NO ADMISSION OF LIABILITY OR WRONGDOING.  This Settlement 
Agreement and any proceedings taken hereunder are not and shall not in any 
way be construed as or deemed to be evidence of (i) any admission or 
concession on the part of any Party of the merits or lack of merits of any 
claim or counterclaim that any of the Parties may have or which they have 
threatened to assert, or (ii) any admission or concession on the part of any 
Party of any liability or wrongdoing whatsoever, which liability and 
wrongdoing are hereby expressly denied and disclaimed by each of the Parties. 
 

               (b)  NO DURESS, ETC.  The Parties agree that this Settlement 
Agreement is entered into without duress, in good faith and for sufficient 
consideration, and that it is fair, just and reasonable to all Parties.

               (c)  FULL KNOWLEDGE, INDEPENDENT ADVICE, ETC.  This Settlement 
Agreement is entered into with full knowledge of any and all rights which the 
Parties may have.  All Parties have received or have had made available to 
them all financial and other information they or their counsel considered 
necessary to make an informed judgment concerning the Settlement Agreement.  
Each Party has received independent legal advice, has conducted such 
investigation as he or his counsel thought appropriate, and has consulted 
with such other independent advisors as each of them and their counsel deemed 
appropriate, regarding this Settlement Agreement and their rights and 
asserted rights in connection therewith.  None of the Parties is relying upon 
any representations or statements made by any other Party, or such other 

                                       18

<PAGE>

Party's employees, agents, representatives or attorneys, regarding this 
Settlement Agreement or its preparation except to the extent such 
representations are expressly set forth herein.

               (d)  REASONABLE EFFORTS.  All Parties hereto agree to exercise 
all reasonable efforts and to take all reasonable steps necessary to 
effectuate the settlement set forth in this Settlement Agreement.

               (e)  SUCCESSORS.  This Settlement Agreement shall be binding 
upon and inure to the benefit of the Parties hereto and their respective 
heirs, successors and assigns, and upon any corporation or other entity into 
or with which any Party hereto may merge, combine or consolidate (provided 
that the Party is the survivor in such merger, combination or consolidation).

               (f)  GOVERNING LAW.  This Settlement Agreement shall be 
governed by and construed and enforced in accordance with the laws of the 
State of California, without reference to the conflict of laws principles 
thereof.

               (g)  AMENDMENT AND WAIVER.  Any provision of Section 4 of this 
Settlement Agreement, may be waived by an instrument in writing signed by 
LIDAK and any such waiver shall be binding on all Parties.  No waiver or 
amendment of any other provision hereof shall be effective as against any 
Party unless such Party agrees to such amendment or waiver in writing.

               (h)  AUTHORITY.  Each person executing this Settlement 
Agreement represents that he or it has read and fully understands this 
Settlement Agreement and that he or it has the authority to execute this 
Settlement Agreement in his individual capacity or in the capacity identified 
on the signature page below.

                                       19

<PAGE>

               (i)  NOTICES.  All notices, requests, claims, demands and 
other communications hereunder shall be in writing and shall be given or made 
(and shall be deemed to have been duly given or made upon receipt) by 
delivery in person, by courier service, by telecopy or by registered or 
certified mail (postage prepaid, return receipt requested) to the respective 
parties at the addresses set forth on Exhibit C (or at such other address for 
a party as shall be specified in a notice given in accordance with this 
paragraph).  Each such notice, request, claim, demand or other communication 
shall be effective (i) if given by telecopy transmission, when such 
transmission to the telecopy number specified in Exhibit C has been made and 
the appropriate electronic confirmation that the entire communication has 
been received by the recipient equipment has been received by the sender or 
(ii) if given by any other. means, when actually received at the address 
specified in this paragraph; provided, in each case, that a notice given 
other than during normal business hours or on a day other than on a business 
day at the place of receipt shall not be effective until the opening of 
business on the next business day at the place of receipt.

               (j)  SPECIFIC PERFORMANCE.  Each of the Parties acknowledges and
agrees that irreparable harm would occur if any provision of this Settlement
Agreement were not performed in accordance with the terms thereof, or were
otherwise breached, and that such harm could not be remedied by an award of
money damages.  Accordingly, the Parties hereto agree that any non-breaching
party shall be entitled to an injunction to prevent breaches of this Settlement
Agreement and to enforce specifically the terms and provisions hereof.  More
specifically, each of the Parties hereto hereby agrees that any action or
proceeding brought under or to enforce any provision of this Settlement
Agreement shall be commenced in the United 

                                       20

<PAGE>

States District Court for the Southern District of California and each Party 
hereto hereby consents to the personal jurisdiction of and venue in such 
United States District Court and agrees further that service of process or 
notice in any such action or proceeding shall be effective if given in the 
manner set forth in Section 9(i) hereof.

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

               (l)  EFFECTIVENESS.  This Settlement Agreement shall become 
effective on the Effective Date.

               (m)  CONSTRUCTION.    This Settlement Agreement shall be 
construed as a whole in accordance with its fair meaning and in accordance 
with the laws of the State of California.  The language of the Settlement 
Agreement shall not be construed for or against any particular Party.  The 
headings used herein are for reference only and shall not affect the 
construction of this Settlement Agreement.

               (n)  INTEGRATION.  This Settlement Agreement is the complete 
and exclusive agreement of the parties with respect to the subject matter 
hereof. There are no restrictions, promises, warranties or undertakings other 
than those set forth herein.  This Agreement supersedes all prior agreements 
and undertakings between or among the parties or any persons related to the 
parties. There are not any other agreements, direct or collateral, written or 
oral, between the parties hereto.  All prior negotiations, agreements, 
undertakings and statements made between the parties hereto which have 
occurred on any subject at any time prior to the execution of this Agreement 
with regard to the subject matter of this Agreement are hereby 

                                       21

<PAGE>

superseded and merged into this integrated Agreement.  Neither this Agreement 
nor any term hereof  may be changed, waived, discharged or terminated, except 
by a subsequent amendment in writing signed by the party against whom such 
provision operates.  No such change, waiver, discharge or termination of this 
Agreement shall be binding upon any party hereto unless and until it is 
signed by that party.

                              [SIGNATURE PAGE FOLLOWS]

                                       22

<PAGE>

          IN WITNESS WHEREOF, the Parties hereto have caused this Settlement 
Agreement to be executed as of the date first above written.

                              LIDAK PHARMACEUTICALS,
                              a California Corporation



                              By:
                                 ---------------------------------




                              HEALTHMED, INC., 
                              a Nevada Corporation,



                              By:
                                 ---------------------------------


                              -------------------------------------
                                   Mitchell J. Stein



                              -------------------------------------
                                   George P. Rutland



                              -------------------------------------
                                   Wallace O. Raubenheimer



                              -------------------------------------
                                   Edward L. Hennessy, Jr. 

                                       23


<PAGE>

                   LIDAK PHARMACEUTICALS AND SHAREHOLDERS COMMITTEE
                             REACH SETTLEMENT AGREEMENT,
                        POSTPONE ANNUAL SHAREHOLDERS' MEETING



     La Jolla, and Beverly Hills, California - March 25, 1998 -- LIDAK 
Pharmaceuticals (Nasdaq NM:LDAKA) and a Shareholders Committee today 
announced that they have entered into a settlement agreement whereby the 
Shareholders Committee will withdraw a previously filed proxy statement in 
support of an alternative slate of directors for LIDAK.  Parties to the 
agreement include LIDAK, HealthMed, Inc. and Wallace O Raubenheimer on behalf 
of the Shareholders Committee, as well as Mitchell J. Stein, George P. 
Rutland and Edward L. Hennessy, Jr.

     The settlement agreement provides for a new LIDAK Board comprised of 
four existing LIDAK directors, three additional independent nominees to be 
mutually agreed upon, and two of the Committee's nominees, Mr. Rutland and 
Mr. Hennessy. Additionally, the LIDAK Board has agreed to two by-law 
amendments, expanding the number of directors to a maximum of nine, and 
creating three classes of directors with staggered three year terms.  The 
director nominees and by-law amendments will be voted upon at the 1998 annual 
shareholders' meeting, which will be postponed to allow adequate time to 
conduct an expeditious search for the additional independent nominees and to 
amend LIDAK's proxy materials.  A date for the meeting will be set after the 
additional independent nominees have been selected.  Information with respect 
to the postponement will be mailed to all shareholders.

     The agreement also provides that the Committee and its nominees will not 
conduct any proxy or other shareholder solicitations through the annual 
meeting of shareholders to occur in 2001, limits additional stock purchases 
or control of voting shares by the parties, and provides that LIDAK will 
reimburse HealthMed for certain third party expenses, not to exceed $150,000. 
The agreement does not contemplate any changes to the Company's current 
executive management.

     Gerald J. Yakatan, president, chief executive officer and a director of
LIDAK, stated, "We are 

<PAGE>

pleased that this potentially contentious situation had such a positive 
outcome for the Company.  The Company was able to avoid the disruption and 
potentially substantial costs associated with a proxy contest by reaching 
this settlement agreement.  We look forward to working with the new Board 
members in determining LIDAK's future, with the mutual ultimate goal of 
significantly enhancing shareholder value."

     Rex Julian Beaber, General Counsel of HealthMed, commented, "As a large 
shareholder of LIDAK, HealthMed believes this agreement will create a Board 
of Directors who will work together in the interests of all shareholders and 
guide LIDAK through successful exploitation of its product into the next 
millennium."

     LIDAK Pharmaceuticals is developing therapeutic products designed to 
treat virally caused diseases, allergies and asthma, inflammatory disorders 
and cancer.  LIDAK's topical drug for the treatment of recurrent oral facial 
herpes, LIDAKOL, was recently submitted to the United States Food and Drug 
Administration for marketing approval.

CONTACT:  Jeffery B. Weinress, Vice President & CFO of LIDAK Pharmaceuticals,
          619-558-0364, ext. 242, or Rex Julian Beaber, General Counsel of
          HealthMed, 310-448-1331.




                                        # # # 


The information contained in this press release, including any forward 
looking statements contained herein, should be reviewed in conjunction with 
the Company's Annual Report on Form 10-K and other publicly available 
information regarding the Company, copies of which are available from the 
Company upon request.  Such publicly available information sets forth many 
risks and uncertainties related to the Company's business and such 
statements, including risks and uncertainties related to drug development and 
clinical trials.  Final review decisions made by the FDA and other regulatory 
agencies concerning clinical trial results are unpredictable and outside of 
the influence and/or control of the company.



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