South Carolina Code of Regulations
Chapter 61 - DEPARTMENT OF HEALTH AND ENVIRONMENTAL CONTROL
Subchapter 61-4 - Controlled Substances
Part 1200 - Controlled Substances Listed in Schedules III, IV and V
Section 61-4.1200.1203 - Limitations on Prescriptions for Schedules III, IV, and V Substances

Prescriptions for controlled substances listed in Schedules III, IV, and V shall not be issued for more than a 90 day supply of the substance. If authorized for refill, no prescription shall be refilled sooner than 48 hours prior to the time that the prescription should be consumed if the prescribed daily dosage is divided into the total prescribed amount. (Example: 4 daily divided into 100 dosage units = 25 days.) Carry over time shall not accrue between refills. In the event that the practitioner does not specify an exact daily dosage, the dispenser shall calculate date of refill from the usual daily dosage recommended by the manufacturer of the controlled substance.