Certified Paraoptometric (CPO) Practice Exam 2025

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What does the abbreviation "p.r.n." signify in medical terminology?

Every day
As needed
Twice a day
Every other day

The correct answer is: As needed

The abbreviation "p.r.n." stands for "pro re nata," a Latin phrase that translates to "as needed." This term is commonly used in medical prescriptions and documentation to indicate that a medication or treatment should be administered only when required, rather than at scheduled times. This approach allows for flexibility and responsiveness to a patient's specific symptoms or conditions, ensuring that care is tailored to individual needs. In contrast, the other options reflect fixed dosing schedules, which do not align with the meaning of "p.r.n."