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HEROIN AND COCAINE What they do to you - And how they do it Introduction Heroin and cocaine are two examples of drugs that were originally developed for medical purposes, but were soon widely used, illegally, as recreational drugs. In UK law, they are both 'Class A' drugs, i.e., they are thought to be extremely harmful. Surprisingly, they are both still sometimes legally used as painkillers - heroin (a.k.a. diacetyl morphine or diamorphine) for controlling extreme pain, and cocaine as an anaesthetic for ear, nose and throat operations. Both heroin and cocaine are synthetic drugs, derived from plants - heroin from the opium poppy and cocaine from the coca plant. In both cases, the synthetic compound turns out to be highly addictive - even more than the original plant material. Users experience a powerful compulsion to take more of the drug. Both also have a tolerance effect - the more you use, over...

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