If a non-controlled prescription is written for "refills prn," how long is that prescription valid for refills?

A prescription for a non-controlled substance that is written for "refills prn" typically allows for refills within a prescribed timeframe, which is generally one year from the date the prescription was written. This is based on federal regulations and most state laws, which recognize that non-controlled medications can be refilled at the discretion of the patient and physician as long as it falls within that one-year limit.

The phrase "refills prn" indicates that the patient can receive refills as needed, but it does not extend the validity of the prescription beyond the one-year mark. After this period, a new prescription would be required to continue treatment. Therefore, the correct answer reflects the standard practice regarding the refill validity for non-controlled substances, allowing flexibility for the patient while also maintaining regulatory compliance.