Analgesic power and the question of acute tolerance to narcotics in man.
D000700:Analgesics; D004361:Drug Tolerance; D006801:Humans; D004091:Hydromorphone; D008297:Male; D009020:Morphine; D009294:Narcotics
D000700:Analgesics; D009294:Narcotics; D009020:Morphine; D004091:Hydromorphone
ANALGESICS; DIHYDROMORPHINONE; MORPHINE