Unless a drug is determined to be generically equivalent to, or a biological product is determined to be interchangeable with, the brand prescribed, drug or biological product selection as authorized by this subchapter does not apply to:
(1) an enteric-coated tablet;
(2) a controlled release product;
(3) an injectable suspension, other than an antibiotic;
(4) a suppository containing active ingredients for which systemic absorption is necessary for therapeutic activity; or
(5) a different delivery system for aerosol or nebulizer drugs.