What is the filling deadline for a partially filled C3-5 prescription?

The correct choice reflects that a partially filled prescription for controlled substances in schedules III, IV, and V can be filled until the prescription expires. For C3-5 medications, federal regulations specify that a partially filled prescription must be completed within six months from the date it was written. This means the patient has the entire duration until the prescription is deemed expired, regardless of how many fills have been used.

Understanding the regulation is crucial as it ensures that patients have adequate time to obtain their medication while also maintaining proper control over the dispensing of controlled substances. This approach helps to prevent misuse and keeps track of prescriptions more effectively.

In contrast, other time frames like 24 hours, 7 days, or 1 month do not align with the legal guidelines established for these controlled substances and may lead to misunderstandings about the validity and timeline associated with partially filled prescriptions.