[C] a piece of paper on which a doctor writes the details of the medicine or drugs that someone needsa doctor's prescription
a prescription for sedatives
UK The doctor should give you a repeat prescription (= another piece of paper allowing more of the same medicine to be given, often without the person seeing the doctor again).
These drugs are only available on prescription (= with a prescription from a doctor).
Prescription charges (= the standard amount of money you pay for any medicine prescribed by a doctor) are rising in June.