What does 'prn' mean in a medical context?

In a medical context, 'prn' is an abbreviation derived from the Latin phrase "pro re nata," which translates to "as needed." This term is commonly used in healthcare to indicate that a medication or treatment should be administered only when necessary, rather than on a fixed schedule. For example, a patient may be instructed to take pain medication prn, meaning they should take it only when they experience pain rather than at set intervals.

The meaning of 'prn' is crucial for ensuring that patients receive medication in a manner that is responsive to their symptoms and needs, allowing for flexibility in treatment. This usage helps to prevent unnecessary medication intake and promotes safety and efficacy in patient care.

The other options refer to different instructions that do not align with the specific meaning of 'prn.' "As prescribed" typically refers to instructions given by a healthcare provider without addressing the need for flexibility. "As directed" generally implies following specific instructions which could be on a schedule or as needed but does not inherently indicate the level of urgency related to symptoms. "Before eating" is a timing instruction related to the intake of medication rather than its necessity based on the patient's condition.