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 Annual Report on Form 10-K of Merck & Co., Inc. for the fiscal year ended December 31, 2013 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 27th day of February 2014.
MERCK & CO., Inc.
/s/ Kenneth C. Frazier
Chairman, President and Chief Executive Officer
Kenneth C. Frazier
(Principal Executive Officer; Director)
 
 
/s/ Peter N. Kellogg
Executive Vice President and Chief Financial Officer
Peter N. Kellogg
(Principal Financial Officer)
 
 
/s/ John Canan
Senior Vice President Finance—Global Controller
John Canan
(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