Vivitrol is definitely an opioid antagonist. Vivitrol is unique in its ability to deal with Alcoholic beverages dependence—Together with opioid use problem. Having said that, the FDA didn't approve Vivitrol to take care of opioid overdoses. Opioid antagonists which can be used for opioid overdoses contain naloxone and nalmefene. Ross https://lillianu581glq0.bimmwiki.com/user