Adams, Raymond D. Harvard Medical School, Boston, Massachusetts.
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Any drug derived from opium, the dried juice of opium poppy (Papaver somniferum) seed pods. In its raw state, opium is an opaque, milky sap that concentrates its active ingredients in the pod (capsule). These pharmacologically active substances, which constitute approximately 25% of the extract, are the alkaloids morphine, codeine, and papaverine. Synthetic and semi-synthetic compounds—such as fentanyl and oxycodone—which resemble morphine in their action, are called opioids. See also: Poppy
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