Hyperion Therapeutics Announces Extension of Action Date for Ravicti(TM) NDA to January 23, 2013

Hyperion Therapeutics

announced today that it has received a communication from the U.S. Food and Drug Administration (FDA) extending the Prescription Drug User Fee Act (PDUFA) action date for its New Drug Application (NDA) for Ravicti™ (glycerol phenylbutyrate) by three months to January 23, 2013. The FDA extended the action date to provide time for a full review of the submission. Such extensions are standard and are provided for by regulation when additional information is submitted within three months of a PDUFA action date. About Ravicti™ (glycerol phenylbutyrate) Ravicti, an investigational drug, is a pre-pro-drug of phenylacetic acid, the active moiety of BUPHENYL®, the only branded therapy currently FDA-approved as adjunctive therapy for the chronic management of patients with the most prevalent urea cycle disorders. Ravicti holds orphan product designations in the US and Europe for the maintenance treatment of patients with urea cycle disorders and in the US for the intermittent or chronic treatment of patients with cirrhosis and any grade of hepatic encephalopathy. About Hyperion Therapeutics Hyperion Therapeutics is a biopharmaceutical company focused on the development and commercialization of novel therapeutics to treat disorders in the areas of