Okla. Admin. Code § 475:30-1-12
The partial filling of a prescription for a controlled dangerous substance listed in Schedules III, IV, or V is permissible; PROVIDED that:
Amended at 31 Ok Reg 332, eff 12-3-13 (emergency)
Amended at 31 Ok Reg 2111, eff 9-12-14
Amended at 36 Ok Reg 993, eff 7-25-19