What does the abbreviation "PRN" stand for in medical prescriptions?

The abbreviation "PRN" in medical terminology stands for "as needed." This term is commonly used in prescriptions to indicate that a medication should be taken only when the patient requires it, rather than on a scheduled or regular basis. For instance, a doctor might prescribe pain medication to be taken PRN, meaning the patient should take it only when they are experiencing pain rather than adhering to a strict dosing schedule. This allows for greater flexibility and personal management of symptoms, which is especially useful for conditions that may fluctuate in intensity.

The other choices misunderstand the nature of the acronym. "Per request only" implies a more restricted use, "for regular use" contradicts the concept of using a medication only when needed, and "prior request needed" suggests a procedural requirement that isn't indicated by the abbreviation.