A new vaccine may be able to totally block that effects of fentanyl — potentially saving thousands of Americans from overdoses each year.Researchers at the University of Houston, in , developed a shot that was able to stop the extremely potent drug from entering the brains of rats.Fentanyl - which is behind around 200 deaths in the US a day - binds to opioid receptors in the brain. During an overdose, the brain is denied of oxygen, causing severe injury or death.
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