Exhibit 99.21
CONSENT OF PERSON ABOUT TO BECOME A DIRECTOR
Pursuant to Rule 438 promulgated under the Securities Act of 1933, as amended, the undersigned
hereby consents to be named as a person about to become a director of Schering-Plough Corporation
(to be renamed Merck & Co., Inc.) in the Registration Statement on Form S-4 filed by
Schering-Plough Corporation with the Securities and Exchange Commission (File No. 333-159371) under
the Securities Act of 1933, as amended.
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/s/ Samuel O. Thier, M.D.
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Name: |
Samuel O. Thier, M.D. |
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June 12, 2009