(1) An out-of-state mail order pharmacy may not substitute a prescription drug unless the substitution is made in compliance with the laws of this state and the rules and regulations of the board. (2) An out-of-state mail order pharmacy may not dispense a substitute drug product to a resident of this state without notifying the patient of the substitution either by telephone or in writing.
Product Selection Of Prescribed Drugs -- Notification
Mont. Code Ann. § 37-7-705, under Out-of-State Mail Service Pharmacies.
Mont. Code Ann. § 37-7-705