The full name for heroin is diamorphine hydrochloride. It is a drug which comes from the opium poppy. This is a class A drug. Known As: Smack, Skag, Brown, H or Gear. Looks Like: What it looks like. It is usually a brown or white powder, sold in ´wraps´ or bags. Apparent Positive Effects: Users tend to feel warm and contented, cushioned from the reality of any problem, fear or anxiety. Larger doses can make them drowsy and relaxed. The Downside: Initial use can result in nausea and vomiting. Regular users can experience chronic constipation, menstrual problems, and respiratory difficulties High doses can lead to unconsciousness, coma or even death. Heroin is extremely addictive. Users become both physically and emotionally dependent on the drug. It becomes a long term problem with life changing effects. Tolerance develops so more is needed to get the same effects. Then users need the drug just to feel normal, and to prevent withdrawal symptoms. Withdrawal symptoms are very unpleasant, and may include muscular aches and spasms, chills and insomnia. Overdose is always a risk because of the variable and unpredictable purity of the drug. Opiates depress the nervous system. Therefore it is dangerous to mix heroin with depressants such as alcohol and tranquillisers. Some people inject heroin which is the most dangerous way of taking any drug. This leads to its own dangers.