An experimental fentanyl vaccine showed promise in an early-stage trial

The vaccine could one day be used to help prevent overdoses and treat addiction.

An experimental vaccine aimed at preventing fentanyl overdoses showed promise in an early-stage clinical trial, the drugmaker, ARMR Sciences, said Wednesday. It’s the first fentanyl vaccine to be tested in humans, and if it proves effective in larger trials, experts say it would mark a major breakthrough in efforts to combat the opioid epidemic in the United States.

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