Naltrexone is classified as an opioid antagonist because once it reaches the opioid receptor it will either push out any opioids, or if vacant, will occupy the receptor. Once it has done this it blocks any opioid entering the receptor. Other uses of naltrexone Naltrexone is sometimes used in the treatment of alcohol dependence. It appears to reduce the desire to drink alcohol in some people. It does not reduce the effects of alcohol, or other drugs except for opioids.
Naltrexone is only available on prescription from a doctor.
Although any doctor can prescribe naltrexone, it is recommended that you seek a doctor who is experienced in the treatment of alcohol and other drug dependence. This means you must completely detox from opioids before you can begin taking naltrexone. The reason for this is that naltrexone will bring on immediate and possibly severe withdrawal symptoms if there are opioids in your body. If you do have opioids in your system, Narcan will immediately bring on withdrawal symptoms which can last approximately one hour. Certain liver conditions may exclude you from taking naltrexone.