Mass. Gen. Laws ch. 94C § 19C
The board of registration in pharmacy shall promulgate regulations requiring pharmacies located in areas with high incidence of opiate overdose, as determined by the board in consultation with the department, to maintain a continuous supply of opioid antagonists, as defined in section 19B; provided, however, that the continuous supply of opioid antagonists shall include opioid antagonists that are approved by the United States Food and Drug Administration to be sold over the counter without a prescription; and provided further, that such pharmacies shall notify the department if the supply or stock of opioid antagonist doses is insufficient to enable compliance with maintaining a continuous supply of opioid antagonists.
Mass. Gen. Laws ch. 94C, § 94C:19C