are opiate drugs agonist or antagonist
Home Â» Opiate Agonist. Opiate agonists are drugs that mimic the effects of naturally-occurring endorphins in the body, and produce an opiate effect by interacting with the opioid receptor sites. Examples of opiate agonists include methadone and LAAM.These synthetic opiates help prevent cravings and withdrawal but do not produce a high or feelings of euphoria. An opiate antagonist is a drug that replaces opiate agonists at the receptor sites.This blocks the patient from experiencing the opiate effects of the agonist drug. Opiate antagonists include naloxone and naltrexone.Methadone is used therapeutically to treat addiction to opiates including heroin, morphine, OxyContin and other drugs. In the treatment of chronic opiate addiction, an opiate agonist can be used as maintenance therapy.his blocks the patient from experiencing the opiate effects of the agonist drug. Opiate antagonists include naloxone and naltrexone. Methadone is used therapeutically to treat addiction to opiates including heroin, morphine, OxyContin and other drugs.