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Drug abuse refers to the use of a drug for purposes for which it was not intended, or using a drug in excessive quantities. Drug addiction is a state of physical or psychological dependence on a drug.
Physical addiction is characterised by the presence of tolerance (needing more and more of the drug to achieve the same effect) and withdrawal symptoms that disappear when further medication is taken.
All sorts of different drugs can be abused, including illegal drugs (such as heroin or cannabis), prescription medicines (such as tranquilisers or painkillers), and other medicines that can be bought off the supermarket shelf (such as cough mixtures or herbal remedies), plus of course alcohol.
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