Definition:(noun) a drug that is available only with written instructions from a doctor or dentist to a pharmacist; "he told the doctor that he had been taking his ####### regularly"(noun) written instructions from a physician or dentist to a druggist concerning the form and dosage of a drug to be issued to a given patient (noun) written instructions for an optician on the lenses for a given person (noun) directions prescribed beforehand; the action of prescribing authoritative rules or directions; "I tried to follow her ####### for success"
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