Narcan, a prescription nasal spray that reverses opioid overdoses, can now be sold over the counter, the Food and Drug Administration said on Wednesday, authorizing a move long-sought by public health officials and treatment experts, who hope wider availability of the medicine will reduce the nation’s alarmingly high drug fatality rates.

By late summer, over-the-counter Narcan, could be for sale in big-box chains, vending machines, supermarkets, convenience stores, gas stations and even online retailers.

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