A prescription (abbreviated Rx) is a written or electronic order from an authorized healthcare provider directing a pharmacist to dispense specific medication to a patient. Prescriptions include the patient's name, medication name and strength, dosage instructions, quantity, and number of refills allowed. In Canada, certain medications require prescriptions because they need professional oversight due to potential risks, side effects, or misuse potential. Provinces regulate who can prescribe medications, typically including physicians, nurse practitioners, and in some cases pharmacists for certain drugs. Prescriptions help ensure patients receive appropriate medications and proper guidance for their use.