A nasal spray that reverses fentanyl overdoses in minutes is being touted as a potential antidote to America's deadly epidemic.Naloxone, sold under the brand name Narcan, works by blocking the synthetic opioid from attaching to receptors in the brain.It was approved for over-the-counter use by the Food and Drug Administration () last month, paving the way for it to be sold at big box stores and vending machines.
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