How long is a prescription for Clonazepam valid if written on 8/1/2019?

The validity period for a prescription in North Carolina for a Schedule IV controlled substance, such as Clonazepam, is six months from the date it was issued. Since the prescription was written on 8/1/2019, it would remain valid until 2/1/2020. This aligns with both federal and North Carolina state regulations, which generally allow for controlled substance prescriptions to be refilled within this six-month timeframe, provided there are remaining authorized refills on the prescription.

Other options do not appropriately reflect the specific regulations that govern the validity of prescriptions for controlled substances. Prescriptions for some non-controlled medications may have validity periods of one year or longer, but this is not the case for Schedule IV substances like Clonazepam. Therefore, the correct answer is that a prescription for Clonazepam is valid for six months.