Heroin

Heroin, also known as diamorphine among other names, is an opioid most commonly used as a recreational drug for its euphoric effects. Medical grade diamorphine is used as a pure hydrochloride salt which is distinguished from black tar heroin, a variable admixture of morphine derivatives—predominantly 6-MAM (6-monoacetylmorphine), which is the result of crude acetylation during clandestine production of street heroin. Diamorphine is used medically in several countries to relieve pain, such as during childbirth or a heart attack, and in opioid replacement therapy. It is typically injected, usually into a vein, but it can also be smoked, snorted, or inhaled. In a clinical context the route of administration is most commonly intravenous injection; intramuscular or subcutaneous injection, as well as orally may also give it in the form of tablets  The onset of effects is usually rapid and lasts for a few hours.