title: Decrease of tolerance development to morphine by 5-hydroxytryptophan and some related drugs.
mesh_terms: D006916:5-Hydroxytryptophan / Q000494:pharmacology*; D000698:Analgesia; D000818:Animals; D001921:Brain / Q000378:metabolism; D004295:Dihydroxyphenylalanine / Q000494:pharmacology; D004361:Drug Tolerance / Q000187:drug effects; D010134:Fenclonine / Q000494:pharmacology; D006168:Guinea Pigs; D008297:Male; D008784:Methysergide / Q000494:pharmacology; D009020:Morphine / Q000037:antagonists & inhibitors* / Q000494:pharmacology; D012110:Reserpine / Q000494:pharmacology; D012701:Serotonin / Q000378:metabolism; D013997:Time Factors
chemical_list: D012701:Serotonin; D004295:Dihydroxyphenylalanine; D009020:Morphine; D012110:Reserpine; D006916:5-Hydroxytryptophan; D010134:Fenclonine; D008784:Methysergide