LIMITED POWER OF ATTORNEY FOR
SECTION 16 REPORTING OBLIGATIONS


	The undersigned hereby constitutes and appoints each of Joan Schmidt or her
successor, Andrew J. Cronauer or his successor, Laurie Stelzer or her successor,
Veronica Vallejo or her successor, and each of them acting singly, as the true
and lawful attorney-in-fact of the undersigned to:

(1)	execute for and on behalf of the undersigned, in the undersigned's capacity
as an employee, officer and/or director (or pending employee, officer and/or
director) of Arena Pharmaceuticals, Inc. (the "Company"), Form IDs and 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 Form ID, 3, 4, or
5, complete and execute any amendment or amendments thereto, and 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 (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
Company, attention the foregoing attorneys in fact.

	This Power of Attorney supersedes any previous power of attorney granted by the
undersigned, in the undersigned's capacity as an employee, officer and/or
director of the Company, and relating to Form ID, 3, 4, or 5.

	IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 28 day of May 2020.




                                         /s/ Katharine Knobil
                                         Signature



                                         Katharine Knobil
                                         Print Name