Amend SB 609 by adding the following appropriately numbered SECTION and renumbering the remaining SECTIONS of the bill accordingly: SECTION ____. Section 40, Texas Pharmacy Act (Article 4542a-1, Vernon's Texas Civil Statutes), is amended Subsection (m) to read as follows: (m) Except as provided by this subsection, drug product selection authorized in this section does not apply to the refill of a prescription for a narrow therapeutic index drug. The board, in consultation with the Texas State Board of Medical Examiners, shall establish, by rule, a list of narrow therapeutic index drugs that are subject to this subsection. A prescription for a narrow therapeutic index drug may be refilled only by using the same drug product by the same manufacturer that the pharmacist last dispensed under the prescription. If a pharmacist does not have the same drug product by the same manufacturer in stock to refill the prescription, the pharmacist may dispense a drug product that is generically equivalent if the pharmacist, before dispensing the generically equivalent drug product, notifies: (1) the patient, at the time the prescription is dispensed, that a substitution of the prescribed drug product has been made; and (2) the prescribing practitioner of the drug product substitution by telephone, facsimile, or mail, at the earliest reasonable time, but not later than 72 hours after dispensing the prescription.