What does the abbreviation "PRN" signify in medication administration?

The abbreviation "PRN" stands for "pro re nata," which is a Latin phrase meaning "as needed." This term is used in medical contexts to indicate that a medication should be administered only when required, rather than on a fixed schedule. For example, a patient might receive pain medication PRN, meaning they can take it whenever they experience pain, rather than at set times throughout the day. Understanding this abbreviation is crucial for ensuring that medications are given appropriately based on a patient's condition and needs.