POWER OF ATTORNEY

	The undersigned hereby constitutes and appoints each of Jennifer Zachary, Jon
Filderman, Kelly Grez, and Anthony Wildasin, signing singly, the undersigned?s
true and lawful attorney-in-fact to: (1)	execute for and on behalf of the
undersigned, in the undersigned?s capacity as an officer or director of Merck &
Co., Inc. (the ?Company?), Forms 3, 4 and 5 in accordance with Section 16(a) of
the Securities Exchange Act of 1934 and the rules thereunder; (2)	do and
perform any and all acts for and on behalf of the undersigned which may be
necessary or desirable to complete and execute any such Forms 3, 4 or 5,
complete and execute any amendment or amendments thereto, and timely file such
form with the United States Securities and Exchange Commission and any stock
exchange or similar authority; and (3)	take any other action of any type
whatsoever in connection with the foregoing which, in the opinion of such
attorney-in-fact, may be of benefit to, in the best interest of, or legally
required by, the undersigned, it being understood that the documents executed
by such attorney-in-fact on behalf of the undersigned pursuant to this Power of
Attorney shall be in such form and shall contain such terms and conditions as
such attorney-in-fact may approve in such attorney-in-fact?s discretion. The
undersigned hereby grants to each such attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever requisite,
necessary, or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might
or could do if personally present, with full power of substitution or
revocation, hereby ratifying and confirming all that such attorney-in-fact, or
such attorney-in-fact?s substitute or substitutes, shall lawfully do or cause
to be done by virtue of this Power of Attorney and the rights and powers herein
granted. The undersigned acknowledges that the foregoing attorneys-in-fact, in
serving in such capacity at the request of the undersigned, are not assuming,
nor is the Company assuming, any of the undersigned?s responsibilities to
comply with Section 16 of the Securities Exchange Act of 1934. This Power of
Attorney shall remain in full force and effect until the undersigned is no
longer required to file Forms 3, 4 and 5 with respect to the undersigned?s
holdings of and transactions in securities issued by the Company, unless
earlier revoked by the undersigned in a signed writing delivered to the
foregoing attorneys-in-fact. This Power of Attorney revokes all previous powers
of attorney with respect to the subject matter of this Power of Attorney. IN
WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 16th day of December, 2024. /s/ Surendralal L. Karsanbhai