What is naltrexone?
Naltrexone is a medication that blocks the effects of drugs known as opioids (a class that includes morphine, heroin or codeine). It competes with these drugs for opioid receptors in the brain. It was originally used to treat dependence on opioid drugs but has recently been approved by the FDA as treatment for alcoholism. In clinical trials evaluating the effectiveness of naltrexone, patients who received naltrexone were twice as successful in remaining abstinent and in avoiding relapse as patients who received placebo-an inactive pill.
