A NEW drug so powerful that a single grain can be deadly is killing hundreds , as experts warn of a looming public health “catastrophe”.

Nitazenes, man-made opioids mainly imported from China, have been linked to a surge in deaths across Europe .

Up to 250 times stronger than heroin, the Class A concoction is so potent it's been nicknamed a “Frankenstein” drug in the past.

It is currently being cut into street drugs like heroin, and also mixed into fake painkillers and anxiety meds that can be easily bought online.

Drug lords do this to make the drugs stronger or stretch supply and boost profits, but it means people can unknowingly take more potent substances, including nitazenes.

Just a trace amount can shut down the body’s central nervous system and trigger an instant overdos

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