September 1, 2017
Pharmacists must adhere to the Texas State Board of Pharmacy substitution rules. Generally, they may dispense a generically equivalent drug or interchangeable biological product if:
(1) the generic drug or interchangeable biological product costs the patient less than the prescribed drug product;
(2) the patient does not refuse the substitution; and
(3) the practitioner does not certify on the prescription form that a specific prescribed brand is medically necessary as specified in a dispensing directive described in subsection (c) of the Texas State Board of Pharmacy substitution rules.