Filling the gap between aspirin and morphine.
D000700:Analgesics / Q000627:therapeutic use*; D000701:Analgesics, Opioid / Q000627:therapeutic use; D004338:Drug Combinations; D006801:Humans; D010146:Pain / Q000188:drug therapy*
D000700:Analgesics; D000701:Analgesics, Opioid; D004338:Drug Combinations