title: Anti-endorphin effects of methadone.
mesh_terms: D004723:Endorphins / Q000037:antagonists & inhibitors*; D006801:Humans; D008297:Male; D008691:Methadone / Q000494:pharmacology*; D009271:Naltrexone / Q000494:pharmacology; D009293:Opioid-Related Disorders / Q000378:metabolism*; D011957:Receptors, Opioid / Q000187:drug effects
chemical_list: D004723:Endorphins; D011957:Receptors, Opioid; D009271:Naltrexone; D008691:Methadone