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| Analgesics, Opioid Analgesics, Addictive | Analgesics, Narcotic | Narcotic Analgesics | Opioid Analgesics | Addictive Analgesics Narcotic or opioid substances, synthetic or semisynthetic agents producing profound analgesia, drowsiness, and changes in mood. Mood changes may be pleasurable, therefore creating a potential for the abuse of these agents; the prototype of these is morphine to which all other analgesics are compared. |