What does the medical abbreviation "p.r.n" mean?

The abbreviation "p.r.n" stands for "as needed" or "as necessary." This term is commonly used in medical contexts to indicate that a treatment, medication, or procedure should be administered only when required, rather than on a fixed schedule. For example, a physician might prescribe pain medication to be taken p.r.n, allowing the patient to take it only when they experience pain, rather than at predetermined intervals. This approach gives patients adaptability based on their circumstances and needs. It is essential in managing various conditions effectively, ensuring that patients have control over their treatment without unnecessary intervention when they are not in need. Other options may refer to specific dosing schedules or conditions that do not capture the true meaning of p.r.n.