Heroin is classified as a schedule 1 drug due to its high potential for abuse and dependence with no approved medical uses. It is processed from morphine which comes from poppy plants. Common methods of taking heroin include injections, snorting, and smoking. Withdrawal symptoms can be severe, including restlessness, muscle pain, and severe craving. Treatment options include methadone and buprenorphine to help reduce withdrawal symptoms and craving. Afghanistan is the largest producer of opium used to make heroin.