Heroin, also known as diacetylmorphine and diamorphine among other names, is a morphinan opioid substance synthesized from the dried latex of the Papaver somniferum plant; it is mainly used as a recreational drug for its euphoric effects. Medical-grade diamorphine is used as a pure hydrochloride salt. Various white and brown powders sold illegally around the world as heroin are routinely diluted with cutting agents. Black tar heroin is a variable admixture of morphine derivatives—predominantly 6-MAM (6-monoacetylmorphine), which is the result of crude acetylation during clandestine production of street heroin. Heroin is used medically in several countries to relieve pain, such as during childbirth or a heart attack, as well as in opioid replacement therapy.

हेरोइन, भी diamorphine के रूप में जाना जाता है, एक अर्द्ध कृत्रिम opioid अफ़ीम, अफीम अफीम के व्युत्पन्न से संश्लेषित दवा है। यह अफ़ीम के 3,6-diacetyl एस्टर है। सफेद क्रिस्टलीय फार्म सामान्यतः हाइड्रोक्लोराइड नमक diacetylmorphine हाइड्रोक्लोराइड है, हालांकि अक्सर इस तरह से है कि मिलावटी एक मैट सफ़ेद पाउडर, जो फ्रीबेस diacetylmorphine आमतौर पर है। Diacetylmorphine की [3] 90% करने के लिए अफगानिस्तान में उत्पादन होने लगा है चमक और स्थिरता डल्लिन्ग। [4]