A type of drug that alleviates pain without loss of consciousness.
ENDOGENOUS OPIOIDS:
Naturally occurring opioids in the body; includes three classes of neurotransmitters—the endorphins, enkephalins, and dynorphins.
OPIATE:
Drug derived directly from opium and used in its natural state, without chemical modification. Opiates include morphine, codeine, thebaine, noscapine, and papaverine.
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