1. A record of each refill of any prescription for a controlled substance or dangerous drug or any authorization to refill such a prescription must be kept:
(a) On the back of the original prescription;
(b) In a bound book or separate file; or
(c) In an electronic record that is readily retrievable.
2. The record must include:
(a) The date of each refill or authorization;
(b) The number of dosage units; and
(c) The signature or initials of the pharmacist who refilled the prescription or obtained the authorization to refill.