(a) If a prescription authorizes a drug to be dispensed by refilling the prescription one or more times and the total quantity of the drug does not exceed a 90-day supply of the drug, a pharmacist who is filling or refilling the prescription may dispense a quantity of the drug that varies from the quantity or amount of the drug originally written on the prescription, if all of these conditions are met:
(1) The action taken by the pharmacist does not result in a quantity or amount of the drug being dispensed that exceeds the total quantity that may be dispensed by filling and refilling the prescription.