For the diagnosis of alcohol use disorder, a healthcare specialist will ask you some questions about your habits, past medical history, and family history. Treatment options are behavioural treatments, support groups and medications. They help to stop or lower the consumption of alcohol or prevent resuming drinking. Vivitrol is a prescription injectable medicine. It is an opioid antagonist, which means that it blocks opioid receptors. For most people, treatment of alcohol use disorder is effective.