The primary efficacy objective of this study is to compare the time to emergence of inadequate analgesia of 8 mg Hydromorphone Hydrochloride Extended-Release taken once every 24 hours versus placebo in the treatment of patients with persistent pain who require an opioid medication for control of their pain.
The objective of this study is to assess the efficacy and safety of 8 mg Hydromorphone Hydrochloride Extended-Release.