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Define the following terms as used in medicine
i).Drug
ii).Prescription
iii).Dosage
iv).Drug abuse

Answer Text:
i).Any substance, natural or manufactured which when used alters body functions
ii).Prescription – giving written instructions by a qualified medical officer giving details on type of drugs and how they should be used.
iii) Dosage – amount of drug/medicine to be taken at a time or regularly on a period of time
iv) Drug abuse – Use of a drug for a use other than what it is meant for/under prescription or over prescription