How often can a pharmacist refill a non-controlled substance according to the rules specified?

The correct answer reflects the allowance for refills of non-controlled substances based on pharmacy jurisprudence. According to federal regulations and many state laws, including Tennessee’s, a pharmacist can refill a prescription for a non-controlled substance up to 90 days from the date the prescription was originally dispensed, provided that the prescribing physician has not indicated otherwise.

This means that as long as the total amount dispensed does not exceed a 90-day supply and the prescription remains valid (not expired), the pharmacist is authorized to refill the medication as needed within that framework. This interpretation balances patient access to medications with safety regulations, allowing patients to maintain their treatment regimens without unnecessary interruptions.

In contrast, options that specify set time frames (such as 30 or 60 days) limit the pharmacist's ability to better accommodate patient needs. When a prescription does not explicitly state a refill limit or specific guidelines, the 90-day supply rule takes precedence, hence further supporting the rationale behind the correct choice.