Naltrexone is a medication used in the treatment of opiate and prescription opioid abuse and addiction because it stops the activity of opiates. It is also used in the treatment of alcohol dependence as it apparently lessens the addict's need to drink. Naltrexone comes in tablet form, or in injection form that can be administered once per month, however the injection can cost up to $1,100 a month.
The difference between Naltrexone and other meds used to treat opiate addiction is that unlike Methadone which is an agonist and is very similar to heroin, Naltrexone is an opiate antagonist, and negates the effects of opioid medications. An individual who has been abstaining from all opioid medications for 7-10 days can begin taking Naltrexone, but they will have to stop taking all other opioid meds while taking the drug. This would include taking Methadone or similar maintenance therapy meds, due to the fact that taking Naltrexone along with these types of medications can cause sudden withdrawal symptoms.
Naltrexone is meant to be used along with a full Gore rehab program which would include counseling, behavioral modification, lifestyle changes, and compliance monitoring.