What is the meaning of vivitrol?

Vivitrol is the brand name for the medication naltrexone, which is used in the treatment of alcohol and opioid addiction. Naltrexone is an opioid receptor antagonist, which means that it blocks the effects of opioids on the brain. This makes it useful in the treatment of addiction, as it can help to prevent people from experiencing the pleasurable effects of opioids, and help to reduce cravings for these substances.