Vivitrol® contains naltrexone, a medication that stops opioid medications from creating a “high.” Administered as a monthly injection, Vivitrol helps prevent relapse in patients recovering from opioid addiction. It can block heroin as well as prescription opioids including Morphine, Codeine, Fentanyl, Oxycodone, Oxymorphone, and Hydrocodone. Vivitrol can also benefit patients recovering from alcohol addiction by reducing the urge to drink.