Source:http://linkedlifedata.com/resource/umls/id/C0027415
MSH: Agents that induce NARCOSIS. This term is considered outdated due to imprecision but continues to be widely used. Originally, agents that caused somnolence or induced sleep (STUPOR); now, any derivative, natural or synthetic, of OPIUM or MORPHINE or any substance that has their effects. Narcotics are potent inducers of ANALGESIA and OPIOID-RELATED DISORDERS.,CSP: 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.