Exhibit 32.1



CERTIFICATION

I, Fred Hassan, Chairman of the Board, Chief Executive Officer and President of
Schering-Plough Corporation, certify, pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002, that:

(1)      the Quarterly Report on Form 10-Q for the period ended March 31,
         2005 (the "Report") which this statement accompanies fully complies
         with the requirements of Section 13(a) of the Securities Exchange Act
         of 1934 (15 U.S.C. 78m); and

(2)      information contained in the Report fairly presents, in all material
         respects, the financial condition and results of operations of
         Schering-Plough Corporation.



Dated:  April 25, 2005



/s/ Fred Hassan
- ---------------
Fred Hassan
Chairman of the Board,
Chief Executive Officer
and President