Definition: Alkaloid obtained from opium, which contains 0.7–2.5%, but usually made from morphine. Used as an analgesic and antitussive; drug dependence (physical and psychic) may develop, but codeine is less liable to produce addiction than morphine; codeine is biotransformed to morphine, which accounts for most of codeine's effects.
[G. kodeia, head, poppy head]
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