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

The abbreviation "PRN" stands for "Pro re nata," which is a Latin phrase meaning "as needed" or "as the situation arises." In the context of medical prescriptions, it is used to indicate that a medication should be administered only when necessary, rather than on a fixed schedule. This allows healthcare providers to give patients medications based on their real-time symptoms or needs rather than following a strict dosing schedule, providing flexibility in treatment.

This usage is particularly common for pain relievers, anti-anxiety medications, and other treatments that may only be needed intermittently. The phrasing of "PRN" helps patients and caregivers understand that they have permission to administer the medication when the patient feels it is required, rather than at predetermined intervals.

The other options do not accurately reflect the meaning or usage of "PRN" in a medical context. For instance, "Per required need" is a misinterpretation of the phrase, while "Prior notice required" and "Personal therapeutic need" do not align with established medical terminology related to prescriptions. Understanding the correct definition is critical for effective patient care and ensuring optimal medication management.