A prescription drug is a medication that requires a doctor's approval to be dispensed. These drugs are used to treat various medical conditions and are often more potent or have a higher risk of side effects than over-the-counter medications. A healthcare professional evaluates a patient's needs and prescribes the appropriate medication, dosage, and duration of treatment. To obtain a prescription drug, patients must visit a licensed healthcare provider, such as a physician or nurse practitioner. Once prescribed, the medication can be filled at a pharmacy. It is important for patients to follow the prescribed instructions to ensure safety and effectiveness.