Pain-killing drug made from the chemical morphine, which is extracted from the dried latex of the opium poppy. Heroin is extremely fast acting, and within a few seconds a small dose will give the user an instant feeling of well-being. Much larger doses can make users relaxed and drowsy. Pure heroin is a white powder, but street heroin comes as a brownish-white powder that can be smoked, snorted or dissolved and injected.
