What does "prn" mean when seen in a prescription?

The term "prn" is derived from the Latin phrase "pro re nata," which translates to "as needed". In the context of a prescription, this indicates that a medication should only be taken when the patient feels it is necessary, rather than on a regular schedule. This can apply to medications for acute symptoms, such as pain relievers or anti-anxiety medications, where the frequency of administration is dependent on the patient's condition and level of discomfort.

Understanding the use of "prn" is crucial for both pharmacy technicians and patients, as it promotes individualized treatment based on symptom management. For instance, a patient may be instructed to take a certain medication prn for headache relief, meaning they should take it only when they experience a headache, rather than at set intervals.