This study will evaluate the effectiveness of a new pharmacological approach to increase efficacy of treatment with extended release naltrexone (XR-naltrexone) for individuals with opioid use disorder by combining it with buprenorphine-naloxone. Adding buprenorphine-naloxone after the patient initiated XR-naltrexone will not produce mu opioid agonist effect but kappa antagonist effects of buprenorphine may provide additional relief of protracted withdrawal, craving, and mood disturbances persisting in patients treated with XR-naltrexone and possibly contributing to premature treatment discontinuation and relapse. This is a parallel arm, double-blind, placebo-controlled study to examine whether addition of buprenorphine will improve treatment retention, reduce opioid craving, and improve mood over 24 weeks of treatment with XR-naltrexone administered every four weeks. Individuals with Opioid Use Disorder (OUD) and beginning treatment with XR-naltrexone for maintenance treatment will be randomized to treatment with adjunctive buprenorphine-naloxone or placebo with 5 additional doses of XR-naltrexone, given every four weeks, and weekly medication management. The study will provide detoxification and a first XR-Naltrexone injection if a participant consents before the first XR-naltrexone injection. In all participants randomization will occur after first XR-NTX injection. Buprenorphine-naloxone (sub-lingual (SL), 4/1 mg/day) or placebo will be started after a first XR-naltrexone dose and tapered off at study completion.
This study will evaluate the effectiveness of a new pharmacological approach to increase efficacy of treatment with extended release naltrexone (XR-naltrexone) for individuals with opioid use disorder by combining it with buprenorphine-naloxone. This is a two arm, double-blind, placebo-controlled study to examine whether addition of buprenorphine-naloxone will improve treatment retention, reduce opioid craving, and improve mood over 24 weeks of treatment with extended release naltrexone (XR-naltrexone) administered every four weeks for a total of 6 injections.