A drug, broadly speaking, is any chemical substance that, when absorbed into the body of a living organism, alters normal bodily function.There is no single, precise definition, as there are different meanings in drug control law, government regulations, medicine, and colloquial usage.It defines a drug as "a chemical substance used in the treatment, cure, prevention, or diagnosis of disease or used to otherwise enhance physical or mental well-being."Drugs may be prescribed for a limited duration, or on a regular basis for chronic disorders.
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