POWER OF ATTORNEY

The undersigned hereby constitutes and appoints each of Andrew J. Cronauer or
his successor, Kevin R. Lind or his 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 27 day of Feb., 2020.

/s/ Joan M. Schmidt
Signature

Joan M. Schmidt
Print Name