Vivitrol® is a non-addictive opioid antagonist or blocker. Treatment is used in conjunction with counseling. This once-monthly injection must be administered by a healthcare provider. Vivitrol® is not a narcotic and requires opioid detox of 7-14 days prior to the start of treatment.
Source: https://www.vivitrol.com/opioid-dependence/what-is-vivitrol