What is the maximum validity period for a C-II prescription?

The maximum validity period for a Schedule II (C-II) prescription is indeed 12 months. In the context of pharmacy law and regulations, C-II prescriptions have strict controls due to their potential for abuse and dependency.

When a prescriber issues a prescription for a C-II substance, it is essential that the prescription is filled within a year from the date written to ensure patient safety and regulatory compliance. After this 12-month period, the prescription cannot be filled or refilled, which underscores the importance of timely use of such medications.

In understanding this topic, it's also critical to recognize that there are different rules governing refills and renewals for C-II compared to other classes of controlled substances. C-II prescriptions cannot be refilled; they must be written anew by the prescriber, which is a regulatory measure aiming to mitigate the risks associated with these medications.

The other options do not reflect the correct regulations as laid out concerning C-II prescriptions, further reinforcing the significance of adhering to the 12-month maximum validity period.