The drug abuse problem as viewed by the investigator: progress in analgesics.
D055598:Chemical Phenomena; D002621:Chemistry; D004336:Drug Antagonism; D006801:Humans; D007981:Levorphanol / Q000494:pharmacology; D009020:Morphine / Q000037:antagonists & inhibitors; D009269:Nalorphine / Q000494:pharmacology; D010423:Pentazocine / Q000494:pharmacology; D019966:Substance-Related Disorders
D007981:Levorphanol; D009020:Morphine; D010423:Pentazocine; D009269:Nalorphine