On May 10, FDA denied a Citizen Petition submitted on behalf of Endo Pharmaceuticals Inc. ("Endo"). The Petition requested that FDA: (1) determine that Opana® ER (oxymorphone hydrochloride) Extended-Release Tablets ("OP") were discontinued for safety reasons, (2) refuse to approve any pending abbreviated new drug application ("ANDA") for a generic version of OP, and (3) suspend and withdraw the approval of any ANDA referencing OP as the reference listed drug. By statute, if a drug was withdrawn from sale for reasons of safety or effectiveness, FDA must refuse to approve any pending ANDA and suspend or withdraw any approved ANDA referencing the drug.
FDA initially approved the New Drug Application ("NDA") for OP held by Endo on June 22, 2006. The approved label advised that the product should be swallowed whole and warned against crushing, chewing, snorting, or injecting the dissolved product to prevent uncontrolled delivery, overdose, and death. FDA approved two ANDAs referencing OP in December 2010. Generic versions of the product entered the market in July 2011 and January 2013, respectively.
FDA approved an NDA for a reformulated version of OP, also called Opana® ER (oxymorphone hydrochloride) Extended-Release Tablets ("OPR"), held by Endo on December 9, 2011. FDA found that OPR could still "dose dump" and approved a label for ORP that was virtually identical to the approved label for OP. Endo ceased shipping OP on May 31, 2012 and submitted the present petition in August 2012 which was subsequently supplemented with preliminary postmarketing data and analysis concerning the abuse of OP, generic versions of OP, and OPR.