Overview Efficacy and Safety of Hydromorphone Hydrochloride Extended-Release Compared to Placebo in Subjects With Persistent Pain Status: Terminated Trial end date: 2005-07-01 Target enrollment: Participant gender: Summary The objective of this study is to assess the efficacy and safety of 8 mg Hydromorphone Hydrochloride Extended-Release. Phase: Phase 3 Details Lead Sponsor: Purdue Pharma LPTreatments: Hydromorphone