Your answer is B. The improper use of medicines. The definition of Drug misuse is The improper use of medicines either prescription or over-the-counter drugs.
Drug misuse involves the process in which drugs are used in the improper
and wrong manner.
All drugs have specific receptors in the body they bind to which enables
optimal drug function.
When drugs are used in improper ways such as not taking the right dosage
or overuse then the drug is said to be misused and may cause effects such
as palpitation, seizures etc.
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