What does "PRN" stand for in medical terminology?

In medical terminology, "PRN" stands for "as needed." This term is commonly used in prescriptions and medical notes to indicate that a medication or treatment should be administered only when necessary, rather than on a fixed schedule. For example, a physician might prescribe pain relief medication to be taken PRN, meaning the patient should take it only when they are experiencing pain rather than at set times throughout the day. This approach allows for more personalized care and can prevent the overuse of medications.

In contrast, the other options do not accurately represent the meaning of "PRN" in a medical context, as they refer to different scenarios in healthcare management or medication scheduling.