LIDAK PHARMACEUTICALS
SC 13D/A, 1998-03-16
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. 1)

                                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 6, 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
                         :         2,187,383
                         :                                                  
 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
                                      2,187,383
- ------------------------------------------------------------------------------
(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
                                      2,187,383
- ------------------------------------------------------------------------------
(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:     David H. Katz, M.D.
      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 $1,528,234.98
          in promissory notes for the shares purchased from Dr. Katz
- ------------------------------------------------------------------------------
 (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                  -----------------------------------------------------
 BENEFICIALLY            : (8)     SHARED VOTING POWER
 OWNED BY                :              -0-
 EACH                    :                                                    
 REPORTING               -----------------------------------------------------
 PERSON WITH             : (9)     SOLE DISPOSITIVE POWER
                         :         Class A Common Stock: 3,344,696
                         :         Class B Common Stock: 385,000             
                         :                                                  
                         -----------------------------------------------------
                         :(10)     SHARED DISPOSITIVE POWER
                         :              -0-
- ------------------------------------------------------------------------------
(11)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
      REPORTING PERSON   Class A Common Stock: 3,344,696
                         Class B Common Stock: 385,000
- ------------------------------------------------------------------------------
(12)  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN 
      SHARES*                                                              /X/

- ------------------------------------------------------------------------------
(13)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
      Class A Common Stock: 8.1%
      Class B Common Stock: 88.7%                                          
- ------------------------------------------------------------------------------
(14)  TYPE OF REPORTING PERSON*
                         IN
- ------------------------------------------------------------------------------
                                                                      
                        *SEE INSTRUCTIONS BEFORE FILLING OUT!

                                       4

<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!


                                       5

<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!

                                       6

<PAGE>

          This Amendment No. 1 amends and supplements the statement on 
Schedule 13D, dated January 12, 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 and the following natural persons: Mitchell J. Stein, David H. 
Katz, M.D., 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. 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.  Mr. Stein's address is 8306 Wilshire Boulevard, Suite 7056, Beverly 
Hills, California 90211.  Dr. Katz's address is c/o Medical Biology Institute 
("MBI"), 11077 N. Torrey Pines Road, La Jolla, California 92037.  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 
occupation of Mr. Stein is President and Chief Executive Officer of 
HealthMed, Inc.  The present principal occupation of Dr. Katz is serving as a 
member of the Board of Directors of the Company and serving as President and 
Chief Executive Officer of MBI.  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.

                                       7

<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)  The Reporting Persons may seek to achieve voting control over 
a majority of the Company's outstanding securities through open market 
purchases, privately negotiated transactions, placement of shares of the 
Company into voting trusts over which HealthMed, Inc. will have voting 
control, the solicitation of proxies or otherwise.

          (b)  Not Applicable.

          (c)  Not Applicable.

          (d)  The intent of the Reporting Persons is to seek to elect three 
new members to the Company's Board of Directors at the Company's 1998 Annual 
Meeting of Shareholders.

          (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.  The Reporting Persons may seek additional financing for the 
Company in order to further the Company's objectives in developing and 
marketing its products.  Such financing may take the form of debt or equity 
issuances.

          (f)  If the financing discussed in Item 4(e) occurs, the Company's 
capitalization will be effected by the issuance of any debt or equity 
financing that the Company may engage in.

                                       8

<PAGE>

          (g)  Not Applicable.

          (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).  Moreover, HealthMed, Inc. may be deemed to have a 
beneficial interest in 709,380 Shares which HealthMed, Inc. may acquire 
pursuant to the terms of the Purchase Rights Agreement (as hereinafter 
defined).  Accordingly, HealthMed, Inc. may be deemed to beneficially own 
approximately 2,187,383 Shares (the "HealthMed Shares"), representing 
approximately 5.4% of the Shares outstanding. Mr. Stein, as president, chief 
executive officer and the indirect majority shareholder of HealthMed, Inc. 
may be deemed to be beneficial owner of the HealthMed Shares, although he 
disclaims beneficial ownership of such shares.

          The percentage of Shares outstanding reported as beneficially owned 
by HealthMed, Inc. on the date hereof is based upon the Company's Form 10-K 
for the Fiscal Year Ended September 30, 1997 so that the HealthMed, Inc.'s 
information is 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 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 1,877,000 shares of Class A 
Common Stock and 375,000 shares of Class B Common Stock, aggregating 
2,252,000, 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 709,380 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 
40,619,511 shares of Class A Common Stock issued and outstanding.

          Dr. Katz is the beneficial owner of 3,344,696 shares of Class A 
Common Stock and 385,000 shares of Class B Common stock.  Dr. Katz may 
therefore by deemed to beneficially own 8.1% of the Class A Common Stock 
outstanding and 88.7% of the Class B Common Stock outstanding.  Pursuant to 
the Articles, each share of Class A Common Stock entitles the holder to one 
vote and each share of Class B Common Stock entitles the holder to five votes 
upon any and all matters submitted to the shareholders of the Company for a 
vote.

          The calculation of the percentage of shares beneficially owned by 
Dr. Katz  as of the date hereof is based on the Company's Form 10-K for the 
Fiscal Year Ended September 30, 1997 in which the Company reported there were 
38,742,511 shares of Class A Common Stock outstanding and 283,000 shares of 
Class B Common Stock outstanding as of December 29, 1997.  The calculation 
gives effect to the automatic conversion of 163,800 shares of Class B Common 
Stock transferred by Dr. Katz into the voting trust (see item 5b below) into 
163,800 shares of Class A Common Stock and 70,200 shares of Class B Common 
Stock sold by Dr. Katz into 70,200 shares of Class A Common Stock as required 
by the Articles.  The calculation also gives effect to (i) Dr. Katz's 
exercise of his stock options (the "Options") which grant to him the right to 
purchase 

                                       9

<PAGE>

1,877,000 shares of Class A Common Stock and 375,000 share of Class B Common 
Stock, (ii) Dr. Katz's exercise of his Class D Warrants to purchase 386,190 
shares of Class A Common Stock, (iii) Dr. Katz's wife's exercise of options 
to purchase 10,000 shares of Class B Common Stock and (iv) Dr. Katz's wife's 
exercise of options to purchase 46,903 shares of Class A Common Stock and 
results, for purposes of calculating the percent of class owned by Dr. Katz, 
in there being 41,286,604 shares of Class A Common Stock issued and 
outstanding and 434,000 shares of Class B Common Stock issued and 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 oustanding.

          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 
oustanding.

          The percentage of Shares oustanding 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.

          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 


                                       10

<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.  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) Within the last sixty days, HealthMed, Inc. and Dr. Katz have 
effected the transactions described in the Katz Stock Purchase Agreement, the 
MBI Stock Purchase Agreement, the Katz Voting Trust Agreement, the MBI Voting 
Trust Agreement, the Purchase Rights Agreement, the Katz Promissory Note and 
the MBI Promissory Note (collectively, the "Operative Agreements").  A 
detailed description of these transactions is set forth in Item 3, Item 5(a) 
and Item 5(b) of this Schedule 13D (and the exhibits hereto) and is hereby 
incorporated herein by this reference and includes the following:

               (1)  HealthMed, Inc. and Dr. Katz and MBI effected the
                    transactions;

               (2)  The date of the transaction was January 12, 1998.

               (3)  The transactions for HealthMed, Inc. involved an
                    aggregate of 2,200,424 shares of Class A Common
                    Stock.  The transactions for Dr. Katz involved a
                    total of 1,027,003 shares of Class A Common Stock;
                    234,000 shares of Class B Common Stock; 1,918,400
                    options to purchase shares of Class A Common Stock;
                    and 375,000 options to purchase shares of Class B
                    Common Stock.  The transactions for MBI involved a
                    total of 217,000 shares of Class A Common Stock.

               (4)  378,300 shares of Class A Common Stock were
                    purchased from Dr. Katz by HealthMed, Inc. and
                    65,100 shares of Class A Common Stock were
                    purchased from MBI, in each case at $4.04 per
                    share.

               (5)  The transactions were privately negotiated and
                    were effected in San Diego, California pursuant to
                    the terms of the Operative Agreements.

          (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 to 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.

                                       11

<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 orally agreed to act 
together with respect to the Shares as and to the extent set forth below.  
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 9.  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, Mr. Stein 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. Stein disclaims any beneficial interest 
in the Shares owned by any other Reporting Person.

          Dr. Katz 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, Dr. Katz 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.

          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, 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.  

                                       12

<PAGE>

ITEM 7.   MATERIAL TO BE FILED AS EXHIBITS

      Exhibit 9:    Joint Filing Agreement among the Reporting Persons pursuant
                    to Rule 3d-1(f)(1)(iii).


                                       13

<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.

                                       14

<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 16, 1998



                                       HEALTHMED, INC.



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




                                       15

<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 16, 1998



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


                                       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 13, 1998



                         


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


                                       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 13, 1998



                         



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


                                       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 13, 1998



                         



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

                                       19


<PAGE>

                                                                      EXHIBIT 9

                                JOINT FILING AGREEMENT


      Agreement among HealthMed, Inc., Mitchell J. Stein, David H. Katz, 
M.D., 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 13th day of March, 1998.

                         HEALTHMED, INC.


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



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



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



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




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

                                       20



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