Progress in the search for morphine substitutes.
D000700:Analgesics; D018712:Analgesics, Non-Narcotic / Q000627:therapeutic use*; D058633:Antipyretics; D009022:Morphine Derivatives
D000700:Analgesics; D018712:Analgesics, Non-Narcotic; D058633:Antipyretics; D009022:Morphine Derivatives
ANALGESICS AND ANTIPYRETICS/therapeutic use; MORPHINE/related compounds