What does the term “prn” mean regarding medication administration?

The term “prn” is derived from the Latin phrase "pro re nata," which translates to "as needed." This designation is used in healthcare to indicate that a medication should be administered only when necessary, rather than on a scheduled basis. For instance, a healthcare provider may prescribe a pain reliever to be taken prn, meaning that the patient should take the medication only when they are experiencing pain, rather than at regular intervals. This approach allows for more personalized patient care, as it addresses individual needs based on specific circumstances.

In this context, the other options do not accurately reflect the meaning of prn. Medications given every hour would imply a fixed schedule, rather than being dependent on the patient's needs. Medications given during specific times do not capture the "as needed" nature of prn administration. Likewise, while medications administered based on the doctor’s notes can vary widely in meaning, it does not specifically denote the need-based approach that prn signifies. Thus, "as needed" is the most precise interpretation of the term in relation to medication administration.