37-7-505. Product selection permitted -- limitation. (1) Except as limited by subsection (2) and unless instructed otherwise by the purchaser, the pharmacist who receives a prescription for a specific drug product by brand or proprietary name may select a less expensive drug product with the same generic name, strength, quantity, dose, and dosage form as the prescribed drug that is, in the pharmacist's professional opinion, therapeutically equivalent, bioequivalent, and bioavailable.
(2) If, in the professional opinion of the prescriber, it is medically necessary that an equivalent drug product not be selected, the prescriber may so indicate by certifying that the specific brand-name drug product is medically necessary for that particular patient. In the case of a prescription transmitted orally, the prescriber must expressly indicate to the pharmacist that the brand-name drug product prescribed is medically necessary.