Naltrexone blocks the reinforcement of euphoria and craving for these addictive substances, helping in deaddiction (or rehabilitation). Ask your doctor or pharmacist any questions you have about naltrexone injection. Sleep changes were a common side effect reported in studies of naltrexone. If you have other questions about naltrexone’s side effects, talk with your doctor or… Continue reading Naltrexone Side Effects: Risks, Warnings, and Common Reactions