What is the maximum duration for which a Schedule III controlled substance prescription can be filled?

The maximum duration for which a Schedule III controlled substance prescription can be filled is indeed 6 months from the date it is written. According to federal regulations, Schedule III substances can be prescribed for a total of up to five refills and must be filled within 6 months of the date the prescription is issued. This regulation allows for the management of conditions requiring ongoing treatment while ensuring that patients receive their medications in a timely manner.

It's important to note that if a prescription is not filled within this timeframe, it becomes invalid and a new prescription would be required. This is in line with the goal of controlling the prescribing and dispensing of medications that have potential for abuse while still providing access to necessary treatments. Other durations mentioned in the options do not align with these federal regulations for Schedule III controlled substances.