Pharmacologic Substance
narcotic Audio
nar·cot·ic [ nahr-kot-ik ]
Subclass of:
Central Nervous System Depressants; Analgesics
Definitions related to narcotics:
  • Agent that produces insensibility, somnolence or induces sleep; especially, any derivative, natural or synthetic, of opium or morphine or any substance that has their effects; narcotics have potent analgesic effects associated with significant changes in mood and behavior, and with the potential for dependence and tolerance following repeated administration.
    CRISP Thesaurus
    National Institutes of Health, 2006
  • Agents that induce NARCOSIS. Narcotics include agents that cause somnolence or induced sleep (STUPOR); natural or synthetic derivatives of OPIUM or MORPHINE or any substance that has such effects. They are potent inducers of ANALGESIA and OPIOID-RELATED DISORDERS.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • Narcotic, drug that produces analgesia (pain relief), narcosis (state of stupor or sleep), and addiction (physical dependence on the drug). In some people narcotics also produce euphoria (a feeling of great elation). A brief treatment of narcotics follows. For full treatment, see drug use. The main...
    Encyclopedia Britannica
    Encyclopedia Britannica, Inc., 2025
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