What does PRN mean when referring to medication usage?

PRN is derived from the Latin phrase "pro re nata," which translates to "as needed." In the context of medication usage, it indicates that a medication can be taken by a patient when required, rather than on a fixed schedule. This is particularly relevant for medications that manage symptoms or conditions that may not occur consistently. For instance, a patient might take a pain reliever PRN, meaning they would only take it when they are experiencing pain rather than at regular intervals throughout the day. Understanding this term is crucial for proper medication management and ensuring that patients receive care tailored to their individual needs.