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

The abbreviation "PRN" stands for "pro re nata," which is a Latin phrase meaning "as needed." In the context of medication administration, it indicates that a medication should be given only when the patient requires it, rather than on a scheduled or regular basis. This is particularly important for medications used to manage symptoms that may not be constant, such as pain, anxiety, or allergic reactions.

Using "PRN" allows for flexibility in treatment, ensuring that patients receive medication only when necessary, thereby minimizing the potential for overmedication and reducing side effects. The other options specify fixed or conditional medication schedules that do not correspond to the concept of administering medication based solely on patient needs.