Certified Paraoptometric (CPO) Practice Exam 2025

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."