Tennessee Code Title 53. Food, Drugs and Cosmetics § 53-10-205

(a) When a pharmacist receives a written, verbal, electronic or facsimile prescription order, and the prescriber has not noted medical necessity of the brand name prescribed, as required in § 53-10-204, the pharmacist shall dispense the least expensive generic equivalent in stock, or a generic equivalent covered under the patient's drug plan, except as provided in subsections (c) and (d).

(b) A pharmacist shall make a reasonable attempt to notify a prescriber if a generic equivalent has become available since the last dispensing of a prescription, and, if authorized by the prescriber, the pharmacist shall dispense the least expensive generic equivalent in stock, or a generic equivalent covered under the patient's drug plan.

(c) If a pharmacist has reason to believe that the brand name drug or drug product is less expensive to the patient or patient's drug plan than the generic equivalent, the pharmacist shall fill the prescription with the brand name drug or drug product.

(d) Nothing in this section shall be construed as prohibiting a pharmacist from complying with the request of a patient with a valid prescription order to obtain a brand name drug or drug product, if: