Across the United States, fentanyl-related deaths have surged, and now a dangerous drug that has existed for decades is making a deadly return.

Nitazenes, a type of synthetic opioid first developed in the 1950s, are showing up on the black market.

Beyond Fentanyl: Oklahoma faces 'Whole New Wave' of deadly opioid overdose

The opioids, with a potency up to 40 times stronger than fentanyl, are disguised as pills like oxycodone.

Experts warn that in certain circumstances, common overdose reversal treatments such as Narcan may not be enough to save someone's life if they consumed nitazenes.

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