What makes fentanyl so deadly and how can people prevent overdoses?

Synthetic opioids, primarily the powerful drug fentanyl, are the main driver of sky-high overdose deaths in the US. CNN Medical Analyst Dr. Leana Wen explains what makes fentanyl so dangerous and what can be used to reverse its effects.

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Chart: Fentanyl Fuels Surge in U.S. Drug Overdose Deaths