Prepared by R.R. Donnelley Financial -- Consent of Ernst & Young LLP

We consent to the incorporation by reference in the Current Report (Form 8-K) dated July 16, 2002 of Amgen Inc., in the Registration Statement (Form S-8 dated July 16, 2002) pertaining to the Amgen Inc. Amended and Restated 1993 Equity Incentive Plan (formerly known as the Immunex Corporation 1993 Stock Option Plan), Amgen Inc. Amended and Restated 1999 Equity Incentive Plan (formerly known as the Immunex Corporation 1999 Stock Option Plan), Amgen Inc. Amended and Restated 1999 Employee Stock Purchase Plan (formerly known as the Immunex Corporation 1999 Employee Stock Purchase Plan), Immunex Corporation Stock Option Plan for Nonemployee Directors and Amgen Inc. Profit Sharing 401(k) Plan and Trust (formerly known as the Immunex Corporation Profit Sharing 401(k) Plan and Trust), in the Registration Statement (Form S-8 No. 33-5111) pertaining to the 1984 Stock Option Plan, 1981 Incentive Stock Option Plan and Nonqualified Stock Option Plan of Amgen Inc., in the Registration Statement (Form S-8 No. 33-24013) pertaining to the Amended and Restated 1988 Stock Option Plan of Amgen Inc., in the Registration Statement (Form S-8 No. 33-39183) pertaining to the Amended and Restated Employee Stock Purchase Plan, in the Registration Statement (Form S-8 No. 33-39104) pertaining to the Amended and Restated Amgen Retirement and Savings Plan, in the Registration Statements (Form S-3/S-8 No. 33-29791 and Form S-8 No. 33-42501) pertaining to the Amended and Restated 1987 Directors’ Stock Option Plan, in the Registration Statement (Form S-8 No. 33-42072) pertaining to the Amgen Inc. Amended and Restated 1991 Equity Incentive Plan, in the Registration Statement (Form S-8 No. 33-47605) pertaining to the Retirement and Savings Plan for Amgen Puerto Rico, Inc., in the Registration Statement (Form S-8 No. 333-44727) pertaining to the Amgen Inc. 1997 Special Non-Officer Equity Incentive Plan, in the Registration Statement (Form S-3 No. 333-19931) of Amgen Inc., in the Registration Statement (Form S-3 No. 333-40405) of Amgen Inc., in the Registration Statement (Form S-8 No. 333-62735) pertaining to the Amgen Inc. Amended and Restated 1997 Special Non-Officer Equity Incentive Plan, in the Registration Statement (Form S-3 No. 333-53929) pertaining to the Amgen Inc. 1997 Special Non-Officer Equity Incentive Plan, the Amgen Inc. Amended and Restated 1991 Equity Incentive Plan, the Amended and Restated 1988 Stock Option Plan of Amgen Inc. and the Amended and Restated 1987 Directors’ Stock Option Plan, in the Registration Statement (Form S-8 No. 333-74585) pertaining to the Amgen Limited Share Save Plan, in the Registration Statement (Form S-8 No. 333-81284) pertaining to the Amgen Nonqualified Deferred Compensation Plan, in the Registration Statement (Form S-8 No. 333-56672) pertaining to the Amended and Restated 1997 Special Non-Officer Equity Incentive Plan, in the Registration Statement (Form S-3 No. 333-56664 and Amendment No. 1 thereto) pertaining to the Amgen Inc. 1997 Special Non-Officer Equity Incentive Plan, the Amgen Inc. Amended and Restated 1991 Equity Incentive Plan, the Amended and Restated 1988 Stock Option Plan of Amgen Inc. and the Amended and Restated 1987 Directors’ Stock Option Plan, in the Registration Statement (Form S-8 No. 333-83824) pertaining to the Amgen Inc. 1997 Special Non-Officer Equity Incentive Plan, and in the Registration Statement (Form S-3 No. 333-88834) of Amgen Inc., and in the related Prospectuses of our report dated January 22, 2002 (except for Note 16 as to which the date is March 8, 2002), with respect to the consolidated financial statements of Immunex Corporation included in the Current Report (Form 8-K) dated May 16, 2002 of Amgen Inc., filed with the Securities and Exchange Commission.