Heroin is an addictive drug with pain-killing properties processed from morphine, a naturally occurring substance from the opium poppy plant. Pure heroin is a white powder. Street heroin is usually brownish white because it is diluted or “cut” with impurities, meaning each dose is different.
Short-term effects include constricted pupils, nausea, vomiting, drowsiness, inability to concentrate and apathy. Heroin is very addictive and users may quickly develop physical and psychological dependence. They also risk developing tolerance for the drug, which means they need constantly higher doses to achieve the effect they want. Long-term heroin use has a variety of severe health effects. Among other things, it can cause severe weight loss, malnutrition and constipation. It can also lead to menstrual irregularity, sedation and chronic apathy.