EXHIBIT 24.1

POWER OF ATTORNEY

Each of the undersigned does hereby appoint GERALYN S. RITTER and BRUCE N. KUHLIK and each of them, severally, his/her true and lawful attorney or attorneys to execute on behalf of the undersigned (whether on behalf of the Company, or as an officer or director thereof, or by attesting the seal of the Company, or otherwise) the Form 10-K Annual Report of Merck & Co., Inc. for the fiscal year ended December 31, 2012 under the Securities Exchange Act of 1934, including amendments thereto and all exhibits and other documents in connection therewith.

IN WITNESS WHEREOF, this instrument has been duly executed as of the 28^th day of February 2013.

MERCK & CO., INC.
/s/ Kenneth C. Frazier         Kenneth C. Frazier	Chairman, President and Chief Executive Officer (Principal Executive Officer; Director)
/s/ Peter N. Kellogg         Peter N. Kellogg	Executive Vice President and Chief Financial Officer (Principal Financial Officer)
/s/ John Canan         John Canan	Senior Vice President Finance—Global Controller (Principal Accounting Officer)
	DIRECTORS

/s/ Leslie A. Brun	/s/ Carlos E. Represas
Leslie A. Brun	Carlos E. Represas
/s/ Thomas R. Cech	/s/ Patricia F. Russo
Thomas R. Cech	Patricia F. Russo
/s/ Thomas H. Glocer	/s/ Craig B. Thompson
Thomas H. Glocer	Craig B. Thompson
/s/ William B. Harrison, Jr.	/s/ Wendell P. Weeks
William B. Harrison, Jr.	Wendell P. Weeks
/s/ C. Robert Kidder	/s/ Peter C. Wendell
C. Robert Kidder	Peter C. Wendell
/s/ Rochelle B. Lazarus
Rochelle B. Lazarus