The purpose of this study is to investigate the safety and effectiveness of 12 weeks
treatment with an extended-release injectable form of naltrexone (Vivitrol) combined with a
psychological intervention in 10 treatment-seeking adults with Cannabis Use Disorder. The
hypotheses are that Vivitrol combined with a psychological intervention will be well
tolerated, and will reduce cannabis use, improve abstinence rates, and reduce cannabis
withdrawal and craving.