MRK · Annual Report (Form 10-K) · Filed February 24, 2026

Merck & Co Inc — 10-K exhibit

exh241-powerofattorney1.htm

Document

Exhibit 24.1

POWER OF ATTORNEY

Each of the undersigned does hereby appoint JENNIFER ZACHARY as his/her true and lawful attorney 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, 2025 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 24th day of February 2026.

MERCK & CO., INC.


/s/ Robert M. Davis			Chairman, Chief Executive Officer and President
Robert M. Davis			(Principal Executive Officer; Director)

/s/ Caroline Litchfield			Executive Vice President and Chief Financial Officer
Caroline Litchfield			(Principal Financial Officer)

/s/ Dalton Smart			Senior Vice President Finance—Global Controller
Dalton Smart			(Principal Accounting Officer)

DIRECTORS


/s/ Douglas M. Baker, Jr.						/s/ Stephen L. Mayo
Douglas M. Baker, Jr.						Stephen L. Mayo

/s/ Mary Ellen Coe						/s/ Paul B. Rothman
Mary Ellen Coe						Paul B. Rothman

/s/ Pamela J. Craig						/s/ Patricia F. Russo
Pamela J. Craig						Patricia F. Russo

/s/ Thomas H. Glocer						/s/ Christine E. Seidman
Thomas H. Glocer						Christine E. Seidman

/s/ Surendralal L. Karsanbhai						/s/ Inge G. Thulin
Surendralal L. Karsanbhai						Inge G. Thulin

/s/ Risa J. Lavizzo-Mourey						/s/ Kathy J. Warden
Risa J. Lavizzo-Mourey						Kathy J. Warden

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