ARENA PHARMACEUTICALS INC - FORM 10-K - EX-23.1 - CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM - March 16, 2010

Attached files

file filename
10-K - FORM 10-K - ARENA PHARMACEUTICALS INCd10k.htm
EX-31.1 - CERTIFICATION OF CEO - ARENA PHARMACEUTICALS INCdex311.htm
EX-21.1 - SUBSIDIARIES OF THE REGISTRANT - ARENA PHARMACEUTICALS INCdex211.htm
EX-32.1 - CERTIFICATION OF CEO AND CFO - ARENA PHARMACEUTICALS INCdex321.htm
EX-31.2 - CERTIFICATION OF CFO - ARENA PHARMACEUTICALS INCdex312.htm
EX-10.36 - AMENDMENT #2 TO TOLL MANUFACTURING AGREEMENT - ARENA PHARMACEUTICALS INCdex1036.htm
EX-10.51 - SUMMARY OF COMPENSATION FOR NON-EMPLOYEE DIRECTORS - ARENA PHARMACEUTICALS INCdex1051.htm

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos. 333-45330, 333-45332, 333-62894, 333-86350, 333-135398 and 333-160329) and Form S-3 (Nos. 333-122435, 333-115670, 333-112542, 333-129519, 333-131310, 333-136023, 333-137030, 333-139191, 333-146818, 333-155660, 333-160983 and 333-165348) of Arena Pharmaceuticals, Inc. and in the related Prospectuses of our reports dated March 16, 2010, with respect the consolidated financial statements of Arena Pharmaceuticals, Inc. and the effectiveness of internal control over financial reporting of Arena Pharmaceuticals, Inc. included in the Annual Report (Form 10-K) for the year ended December 31, 2009.

/s/    Ernst & Young LLP

San Diego, California

March 16, 2010

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