Minn. Stat. § 62W.075: THERAPEUTIC ALTERNATIVE PRESCRIPTION DRUG.

A pharmacy benefit manager or health carrier must not require, or demonstrate a preference for, a pharmacy to dispense a therapeutically equivalent or therapeutically alternative drug that costs the enrollee more out-of-pocket than the prescribed drug, unless the substitution is made for medical reasons that benefit the patient. Before a substitution is made under this section, the pharmacy must obtain approval from the prescribing practitioner and must inform the enrollee of the reason for the substitution.