Heroin is an opioid just as OxyContin, Vicodin, morphine, and fentanyl. Heroin is also known as smack, junk, black tar, and horse. It can be inhaled, smoked, or injected. Opioids bond to receptors in the human body and brain and block pain, but side effects include nausea, confusion, and depressions. A tolerance can quickly be built and larger doses will be needed. This also makes overdosing easier.
Heroine nods are a common effect in which movements are slow and the person seems to fall asleep standing or sitting with their head hung down. The presence of needles, burned, bent spoons, rubber tubing, and vials are markers of heroin use.