prescription has 3 distinct synonyms spread across 1 of its 5 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is nonprescription.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
directions prescribed beforehand; the action of prescribing authoritative rules or directions
“I tried to follow her prescription for success”
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 prescription regularly”
written instructions for an optician on the lenses for a given person
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
available only with a doctor's written prescription
“a prescription drug”
Synonyms, antonyms and the broader and narrower relations for prescription come from Princeton University’s WordNet. Full sources and licences.