Ultrapotent synthetics, mostly from China, are easy to smuggle and mix into heroin, recreational drugs and gray-market ...

Carfentanil is 10,000 more times more potent than morphine and 100 times more potent than fentanyl, Tuell confirmed. "Even a small amount can be fatal, as it can cause respiratory failure," he said.

N-Desethyl etonitazene and another formulation, etonitazene, are "about 10 times as potent as fentanyl," Zagorski said. Fentanyl is about 50 times more potent that heroin, according to the DEA.

Police in Palm Beach County have discovered the presence of a synthetic opioid that is considered up to 50 times more potent than fentanyl. The drug, N-Desethyl Isotonitazene, or ISO, has been ...

The Swiss drug maker CIBA, now part of Novartis, developed the first nitazenes in the late 1950s as potential pain treatments. However, none was approved because they were too dangerously potent.

A synthetic opioid 1000 times more potent than morphine is infiltrating the street drug trade in Adelaide, Australia, sparking fears of a wave of overdoses that could be lethal.