AMERICAN HOME PRODUCTS CORP
SC 13D/A, 2000-08-09
PHARMACEUTICAL PREPARATIONS
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                 SCHEDULE 13D/A

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 8)*

                               Immunex Corporation
                                (Name of Issuer)

                          Common Stock, $.01 par value
                         (Title of Class of Securities)

                                   45252810 2
                                 (CUSIP Number)

                           LOUIS L. HOYNES, JR., ESQ.
                  Executive Vice President and General Counsel
                       American Home Products Corporation
                      5 Giralda Farms, Madison, N.J. 07940
                                 (973) 660-5000

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

                                 August 9, 2000

             (Date of Event which Requires Filing of this Statement)

If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of Sections 240.13d-1(e),  240.13d-1(f) or 240.13d-1(g),  check
the following box [ ].

Note:  Schedules  filed in paper format shall include a signed original and five
copies of the schedule,  including all exhibits.  See Section  240.13d-7(b)  for
other parties to whom copies are to be sent.

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

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

<PAGE>

CUSIP No. 45252810 2

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

        American Home Products Corporation ("Parent")
        Tax I.D. 13-2526821

2.      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
        (a)  N/A
        (b)

3.      SEC USE ONLY

4.      SOURCE OF FUNDS*

        WC

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

        [ ]

6.      CITIZENSHIP OR PLACE OF ORGANIZATION

        Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH

7.      SOLE VOTING POWER

        -0-

8.      SHARED VOTING POWER

        283,878,088

9.      SOLE DISPOSITIVE POWER

        -0-

10.     SHARED DISPOSITIVE POWER

        283,878,088

11.     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        283,878,088

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

        [  ]

13.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
        55.0%

14.     TYPE OF REPORTING PERSON*

        CO

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>


CUSIP No. 45252810 2

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

        MDP Holdings, Inc.("MDP") Tax I.D. 22-3187914

2.      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
        (a)  N/A
        (b)

3.      SEC USE ONLY

4.      SOURCE OF FUNDS*

        WC

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

        [ ]

6.      CITIZENSHIP OR PLACE OF ORGANIZATION

        Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH

7.      SOLE VOTING POWER

        -0-

8.      SHARED VOTING POWER

        225,108,991

9.      SOLE DISPOSITIVE POWER

        -0-

10.     SHARED DISPOSITIVE POWER

        225,108,991

11.     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        225,108,991

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

        [  ]

13.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

        45.0%

14.     TYPE OF REPORTING PERSON*

        CO

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>


CUSIP No. 45252810 2

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

        Lederle Parenterals, Inc. ("LPI")
        Tax I.D. 22-2132271

2.      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
        (a)  N/A
        (b)

3.      SEC USE ONLY

4.      SOURCE OF FUNDS*

        WC

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

        [ ]

6.      CITIZENSHIP OR PLACE OF ORGANIZATION

        New Jersey

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH

7.      SOLE VOTING POWER

        -0-

8.      SHARED VOTING POWER

        43,225,056

9.      SOLE DISPOSITIVE POWER

        -0-

10.     SHARED DISPOSITIVE POWER

        43,225,056

11.     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        43,225,056

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

        [  ]

13.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

        8.6%

14.     TYPE OF REPORTING PERSON*

        CO

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>

     The  Statement  on Schedule  13D,  dated  December  1, 1994 (the  "Original
Statement"), filed by American Home Products Corporation, a Delaware corporation
("Parent" or  "Reporting  Person"),  and on behalf of AC  Acquisition  Corp.,  a
Delaware  corporation,  as amended by  Amendment  No. 1, dated  November 2, 1995
("Amendment  No. 1"),  Amendment No. 2, dated November 3, 1995  ("Amendment  No.
2"), Amendment No. 3, dated November 15, 1995 ("Amendment No. 3"), Amendment No.
4, dated April 23, 1999 ("Amendment No. 4"), Amendment No. 5, dated May 20, 1999
("Amendment No. 5"),  Amendment No. 6, dated August 6, 1999  ("Amendment No. 6")
and Amendment No. 7, dated June 23, 2000  ("Amendment  No. 7") is hereby further
amended by this  Amendment  No. 8, dated August 9, 2000  ("Amendment  No. 8") to
reflect  certain  changes in the  information  previously  filed relating to the
outstanding  Common  Stock,  $.01 par value  (the  "Common  Stock"),  of Immunex
Corporation,  a Washington  corporation  ("Immunex" or "Issuer"),  which has its
principal executive offices at 51 University Street, Seattle, WA 98101.

     Any Items which include  descriptions of Exhibits attached to this Schedule
13D which incorporate by reference such Exhibits are qualified in their entirety
by such Exhibits.

     Item 4 is hereby amended by adding the following language:

     Parent,  MDP and LPI intend to  continuously  review  their  investment  in
Immunex.  In reaching any decision with respect to such investment,  Parent, MDP
and LPI will take into consideration various factors, such as Immunex's business
and prospects,  the  obligations of Parent and ACY under the agreements  between
Parent and/or ACY and Immunex,  other  developments  concerning  Immunex,  other
investment  opportunities available to Parent, MDP and LPI, and general economic
and market conditions.  Depending on the result of their review of such factors,
Parent, MDP and LPI may decide to dispose of all or a portion of such securities
(whether  now or hereafter  held) or Parent,  MDP and LPI may decide to purchase
additional equity securities of Immunex,  in each case, subject to the terms and
conditions of agreements between Immunex and ACY and/or Parent.

     On August 9, 2000, Immunex filed a shelf registration statement on Form S-3
with the Securities and Exchange  Commission  covering the  registration  of the
proposed  sale of up to 20  million  shares of newly  issued  Common  Stock in a
primary offering (the "Primary  Offering") and 50 million shares of Common Stock
in a secondary  offering by Parent (the "Secondary  Offering")  which shares are
planned to be sold in one or more  underwritten  public  offerings  (the Primary
Offering and the Secondary  Offering are referred to herein as the  "Offering").
Under the terms of the Letter Agreement  relating to the proposed offering which
is attached hereto as Exhibit XI and is incorporated herein by reference, in the
event that Parent  sells any shares of Common Stock in the  Secondary  Offering,
Parent  has agreed not to sell any  additional  shares of Common  Stock from the
date of execution of each  underwriting  agreement for the Second Offering until
the later of (i)  September  30, 2001 or (ii) nine months after the date of such
underwriting agreement (the "lock-up period"). Parent also agreed to convert the
entire principal amount of the $450,000,000 3% Convertible Subordinated Note Due
2006 (the "Note") into Immunex Common Stock at the Conversion  Price (as defined
in the Note  Agreement)  on the date of  conversion  in the event  that  Immunex
obtains third-party financing for a significant  facilities  development project
by Immunex in Seattle.

     On August 9, 2000, Parent,  Cyanamid and Immunex entered into Amendment No.
2 (the  "Amendment") to the Amended and Restated  Governance  Agreement which is
attached  hereto as Exhibit XII and is  incorporated  herein by  reference.  The
Amendment  provides for the  following  to be  effective  in the event  Parent's
ownership  interest  falls  below 45% of the total  outstanding  Immunex  Common
Stock:  (i) at all times that Parent has the right to designate no more than two
Investor Directors (as defined in the Governance Agreement),  Immunex shall have
the right to designate  three  Management  Directors and there shall be at least
four  Independent  Directors,  (ii) for the duration of any lock-up period,  all
shares  issued  pursuant to employee  stock options  during each lock-up  period
shall be disregarded in determining  whether Parent's  ownership  interest falls
below 35% for purposes of the Governance  Agreement and (iii) certain governance
restrictions shall be revised to grant greater flexibility to Immunex in certain
respects as set forth more fully in Exhibit XII.

     Item 4(d) is amended to add the following:

     Upon the completion of the Secondary Offering, Parent's holdings in Immunex
Common  Stock would be  expected  to fall below 45% but remain  above 35% of the
outstanding  Common Stock and therefore  pursuant to the terms of the Governance
Agreement,  Parent would retain the right to designate two Investor Directors on
the Immunex Board.

     Except as set forth above or in any other item hereof,  Parent, MDP and LPI
do not have any present plans or proposals that would relate to or result in any
of the actions required to be described in Item 4 of Schedule 13D.

     Item 6 is hereby  amended to add the following  language at the end of this
item:

     On August 9,  2000,  Parent and  Immunex  entered  into a Letter  Agreement
attached hereto as Exhibit XI which is incorporated  herein by reference related
to the filing of the shelf registration  statement filed by Immunex covering the
proposed  sale of 50  million  shares of  Immunex  Common  Stock to be sold in a
Secondary  Offering,  along with the  proposed  sale of 20 million  newly issued
shares  of Common  Stock to be sold in the  Primary  Offering  as  described  in
greater  detail above in Item 4 hereof which such  description  is  incorporated
herein by reference.

     On August 9, 2000, Parent,  Cyanamid and Immunex entered into the Amendment
which is attached hereto as Exhibit XII and is incorporated herein by reference.
The Amendment  includes  certain changes which are described in detail in Item 4
which such description is incorporated herein by reference.

     Item 7 is hereby  amended by adding the  following  language  at the end of
this item:

     Exhibit X - Press Release, dated August 9, 2000, announcing the filing of a
Shelf  Registration  Statement by Immunex  Corporation,  to include both primary
shares and shares held by Parent and/or its Affiliates.

     Exhibit XI - Letter Agreement  between Parent and Immunex,  dated August 9,
2000, relating to the Shelf Registration Statement and related matters.

     Exhibit  XII -  Amendment  No. 2 to the  Amended  and  Restated  Governance
Agreement, dated August 9, 2000.

     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.

     Dated: August 9, 2000

                                            AMERICAN HOME PRODUCTS CORPORATION


                                            By:  /s/ Kenneth J. Martin
                                            Kenneth J. Martin
                                            Senior Vice President and
                                            Chief Financial Officer


<PAGE>


Attachment  A to the  Schedule  13D with regard to the  executive  officers  and
directors of American Home Products  Corporation  is hereby amended and restated
as follows:

                                                                Attachment A

                        Executive Officers and Directors of
                        American Home Products Corporation

     The  names  and  titles  of the  executive  officers  and the  names of the
directors of American Home Products  Corporation  ("Parent")  and their business
addresses and principal occupations are set forth below. If no address is given,
the director's or executive officer's business address is that of Parent. Unless
otherwise  indicated,  each occupation set forth opposite an  individual's  name
refers to employment with Parent and each individual is a United States citizen.

EXECUTIVE OFFICERS                  Position; Present Principal Occupation
-------------------                 --------------------------------------

John R. Stafford                    Chairman and Chief Executive Officer

Robert Essner                       President and Chief Operating Officer

Louis L. Hoynes, Jr.                Executive Vice President and
                                    General Counsel

Kenneth J. Martin                   Senior Vice President
                                    and Chief Financial Officer

Robert I. Levy                      Senior Vice President-Science and
                                    Technology

William J. Murray                   Senior Vice President

David M. Olivier                    Senior Vice President

Paul J. Jones                       Vice President and Comptroller

Rene R. Lewin                       Vice President-Human Resources

Thomas M. Nee                       Vice President-Taxes

DIRECTORS                           Position; Present Principal Occupation
------------                        --------------------------------------

Clifford L. Alexander, Jr           President of Alexander & Associates,
400 C Street, NE                    Inc. (consulting firm specializing in
Washington, D.C. 20002              Workforce Inclusiveness)

Frank A. Bennack, Jr.               President and Chief Executive Officer
The Hearst Corporation              of The Hearst Corporation
959 Eighth Avenue                   (owns and operates communications
New York, New York 10019            media)

Richard L. Carrion                  Chairman, President and Chief
209 Munoz Rivera Avenue             Executive Officer, Banco Popular
Hato Rey, PR  00918                 de Puerto Rico

Robert Essner                       Listed above

John D. Feerick                     Dean, Fordham University
Fordham University                  School of Law since 1982
School of Law
140 West 62nd Street
New York, New York 10023

John P. Mascotte                    President and Chief Executive
2301 Main Street                    Officer, Blue Cross Blue Shield
Eighth Floor                        of Kansas City, Inc.
Kansas City
Missouri 64108

Mary Lake Polan,                    Chairman and Professor,
M.D., Ph.D.                         Department of Gynecology &
Stanford University                 Obstetrics, Stanford University
School of Medicine                  School of Medicine
300 Pasteur Drive
Stanford, CA 94305

Ivan G. Seidenberg                  President and Co-Chief
Verizon Communications, Inc.        Executive Officer,
1095 Avenue of the                  Verizon Communications
Americas                            (telecommunications company)
New York, New York 10036

John R. Stafford                    Listed above

John R. Torell III                  Senior Managing Partner, Conifer
Conifer Capital Group               Capital Group
9 West 57th Street                  (financial advisory company)
New York, New York 10019





<PAGE>






                                    Exhibit Index

     Exhibit X - Press Release, dated August 9, 2000, announcing the filing of a
Shelf  Registration  Statement by Immunex  Corporation,  to include both primary
shares and shares held by Parent and/or its Affiliates.

     Exhibit XI - Letter Agreement  between Parent and Immunex,  dated August 9,
2000, relating to the Shelf Registration Statement and related matters.

     Exhibit  XII -  Amendment  No. 2 to the  Amended  and  Restated  Governance
Agreement, dated August 9, 2000.





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