Heroin is a depressant drug, which means it slows down the messages travelling between your brain and body. Heroin belongs to a group of drugs known as ‘opioids’ that are from the opium poppy. 1. Heroin comes in different forms including:1  Fine white powder. 2  Coarse off-white granules.sing heroin with other drugs. The effects of taking heroin with other drugs – including over-the-counter or prescribed medications – can be unpredictable and dangerous, and could cause: 1  Heroin + ice, speed or ecstasy: enormous strain on the heart and kidneys, and increased risk of overdose. 4.