Proceeds to Support Advancement of Pimavanserin Phase III Program

ACADIA Pharmaceuticals Inc. (NASDAQ:ACAD), a biopharmaceutical company utilizing innovative technology to fuel drug discovery and clinical development of novel treatments for central nervous system disorders, today announced that it has entered into a securities purchase agreement for a private placement financing with a select group of institutional investors, including New Enterprise Associates and Venrock. Upon the closing of the transaction, ACADIA will receive gross proceeds of $15.0 million from the sale of approximately 12.57 million units at a price of $1.19375 per unit. Each unit consists of one share of ACADIA’s common stock and a warrant to purchase 0.35 shares of common stock. The private placement is expected to close on January 12, 2011 and is subject to the satisfaction of customary closing conditions.

The anticipated proceeds from the private placement will provide ACADIA with additional resources to advance its Phase III pimavanserin program, including the ongoing Phase III trials in Parkinson’s disease psychosis, and is expected to extend ACADIA’s cash runway into 2013.

JMP Securities LLC acted as lead placement agent and MTS Securities, LLC, an affiliate of MTS Health Partners, acted as co-placement agent in the transaction.
The securities sold in the private placement have not been registered under the Securities Act of 1933, as amended, or state securities laws and may not be offered or sold in the United States absent registration with the Securities and Exchange Commission (“SEC”) or an applicable exemption from such registration requirements. ACADIA has agreed to file a registration statement with the SEC covering the resale of the shares of common stock, including the shares of common stock issuable upon exercise of the warrants, sold in the private placement.

About ACADIA Pharmaceuticals

ACADIA is a biopharmaceutical company utilizing innovative technology to fuel drug discovery and clinical development of novel treatments for central nervous system disorders. ACADIA has a portfolio of four product candidates including pimavanserin, which is in Phase III clinical development as a treatment for Parkinson’s disease psychosis. ACADIA also has a product candidate in Phase II for chronic pain and a product candidate in Phase I for glaucoma, both in collaboration with Allergan, as well as a product candidate in IND-track development for schizophrenia in collaboration with Meiji Seika Kaisha. All of the product candidates in ACADIA’s pipeline emanate from discoveries made using its proprietary drug discovery platform. ACADIA maintains a website at www.acadia-pharm.com to which ACADIA regularly posts copies of its press releases as well as additional information and through which interested parties can subscribe to receive email alerts.