Which of the following best describes a "PRN" prescription?

A "PRN" prescription stands for "pro re nata," which is a Latin term meaning "as needed." This indicates that the medication should be administered only when the patient requires it, rather than on a fixed schedule. This type of prescription is commonly used for medications where symptoms may arise unpredictably, such as pain relief or anxiety medications.

The other choices suggest rigid dosing regimens. One option implies that the medication should be taken at specific intervals, which contradicts the flexible, need-based nature of a PRN prescription. Another choice restricts dispensing to weekends, which is unrelated to the typical use of PRN medications. Lastly, a daily requirement characterizes a scheduled regimen rather than one that allows for patient discretion in administration based solely on needs.