A prescription is an order written by a doctor for someone to get a drug that is not available without this permission. If you get a bad ear infection, you'll need a prescription for antibiotics.
When your doctor writes a prescription, she's advising you to take a medication that you can only get from a pharmacist. You can refer to the paper with the drug's name and the doctor's signature and the bottle of medicine as a prescription. Sometimes prescription is used in a non-medical way to simply mean a suggestion or recommendation, like laughter and friends — a great prescription for chasing away the blues.
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