Heroin, also known as diamorphine, is a semi-synthetic opioid drug synthesized from morphine, a derivative of the opium poppy. The white crystalline form is commonly the hydrochloride salt diacetylmorphine hydrochloride, though, when supplied illegally, it is often adulterated, thus dulling the sheen and consistency from that to a matte white powder, which diacetylmorphine freebase typically is. 90% of illicit heroin is thought to be produced in Afghanistan. Learn what heroin looks like, what it’s called on the street, what teens have heard about the drug and more.