POWER OF ATTORNEY


	Know all by these presents that the undersigned hereby constitutes and appoints
each of Prabhavathi Fernandes, Mark W. Hahn, Kenneth E. Eheman and Alexander M.
Donaldson, and each of them acting alone, 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, director and/or 10% or
more stockholder of Cempra, Inc. (the "Company"), Forms ID, 3, 4, 5 and Update
Passphrase Acknowledgement (and any amendments thereto) in accordance with
Section 16(a) of the Securities Exchange Act of 1934, as amended (the "1934
Act"), and the rules promulgated 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 Form ID, 3, 4, 5 and Update Passphrase
Acknowledgement  (and any amendments thereto) and to file timely 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 1934 Act.

	This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms ID, 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 each of the foregoing attorneys-in-fact.

	IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 26th day of July 2016.


						/s/John D. Bluth
						John D. Bluth