title: Prolonged excretion of morphine in rats during protracted abstinence: lack of effect of naltrexone.
mesh_terms: D000818:Animals; D001835:Body Weight / Q000187:drug effects; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D008297:Male; D009020:Morphine / Q000009:adverse effects / Q000652:urine*; D009270:Naloxone / Q000031:analogs & derivatives*; D009271:Naltrexone / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains; D013375:Substance Withdrawal Syndrome / Q000378:metabolism*
chemical_list: D009270:Naloxone; D009271:Naltrexone; D009020:Morphine