The pharmacologic basis for the choice of an analgesic. I. Potent analgesics.
D000700:Analgesics / Q000494:pharmacology*; D006801:Humans; D009019:Morphinans / Q000494:pharmacology; D009020:Morphine / Q000494:pharmacology
D000700:Analgesics; D009019:Morphinans; D009020:Morphine