In this section, “authorized prescriber” has the meaning stated in § 12–101 of this title. This section does not apply to: A controlled dangerous substance as defined in § 5–101 of the Criminal Law Article; or The first prescription or change in a prescription for a drug that an authorized prescriber prescribes for a patient. Except as provided in subsection (d) of this section, a pharmacist may dispense, in a single dispensing and exercising the professional judgment of the pharmacist, a quantity of a prescription drug that: Is up to the total number of dosage units authorized by the prescriber on the original prescription and any refills of the prescription; Except for a contraceptive dispensed on or after January 1, 2020, does not exceed a 90–day supply of the prescription drug; and For a contraceptive dispensed on or after January 1, 2020, does not exceed a 12–month supply of the prescription drug. A pharmacist may not dispense, in a single dose, a quantity of a prescription drug that exceeds the limit prescribed by a prescriber when the prescriber has indicated that the prescription be dispensed only as prescribed.