EXHIBIT 23 INDEPENDENT AUDITORS' CONSENT We consent to the incorporation by reference in Registration Statements No. 2-83963, No. 33-19013, No. 33-50606 and No.33-57111 on Form S-8, Post-Effective Amendment No. 1 to Registration Statement No. 2-84723 on Form S-8, Post-Effective Amendment No. 1 to Registration Statement No. 2-80012 on Form S-3 and Post- Effective Amendment No. 1 to Registration Statement No. 2-77740 on Form S-3 of our reports dated February 15, 1995,appearing in and incorporated by reference in this Annual Report on Form 10-K of Schering-Plough Corporation for the year ended December 31, 1994. /s/DELOITTE & TOUCHE LLP Parsippany, New Jersey March 3, 1995