A Study to Evaluate Withdrawal Effects Following Dosing of Oxycodone/Naltrexone in Methadone-Maintained Subjects

This single-center study is a randomized, double-blind, active-controlled, multiple-dose, parallel group study to evaluate the potential withdrawal effects, safety and tolerability, and pharmacokinetic and pharmacodynamic effects of multiple doses of oral intact Oxycodone/Naltrexone capsules compared to oxycodone in methadone-maintained opioid-dependent subjects. The study will consist of a Screening Phase, an inpatient Treatment Phase (including a methadone stabilization period, a placebo administration period, a treatment administration period and a safety/washout period), and a Follow-up Phase.