Exhibit 23.3 Consent of Ernst & Young LLP, Independent Auditors We consent to the reference to our firm under the caption "Experts" and to the use of our report dated February 14, 2000, except with respect to Note 5, as to which the date is April 26, 2000, with respect to the financial statements of Kinetix Pharmaceuticals, Inc. (A Development-Stage Company), included in Amendment No. 1 to Registration Statement (Form S-4, No. 333-49248) of Amgen Inc. for the registration of 3,177,829 shares of its common stock. /s/ Ernst & Young LLP Boston, Massachusetts November 10, 2000