Sources Heroin is a semisynthetic opiate derived from dried poppy sap. Also derived from poppy, though not synthesized, are morphine and codeine. Heroin is commonly adultered with sugar, starch, powdered milk, or quinine. When heroin is snorted it has the same effects, except that a pleasant drowsiness replaces the rush. Nausea and vomiting can accompany these effects, as well as constipation.
Users find themselves midway between awake and asleep.
Heroin also decreases sexual performance. This happens because heroin affect the release of many hormones and neurotransmitters, including those associated with regulating sexual behavior. Ability to reach orgasm is often impaired. Eyelids are droopy, perhaps slowly closing periodically as the person nods off. Irises may be red.