Heroin, classified as a depressant drug or “downer,” is an opiate. Heroin, like other opiates such as OxyContin, suppresses the central nervous system. As a result, the user’s heart rate slows down and experiences a decrease in coordination. Additionally, opioids often relax muscles, induce sleep, dull the senses, and diminish pain. The use of opiates can cause nausea, constrict the pupils, and induce constipation. Long term use of opioids can also cause psychological and physical dependence resulting in addiction. In general, users can smoke, snort, or inject heroin directly into their veins. Thus, producing a fast, euphoric high, that becomes addicting.