Nitazenes are synthetic opioids 500 times more potent than heroin. The drug is increasingly showing up on the streets of the UK, the Netherlands, Australia and the US. Since 2019, nitazines have been implicated in more than 200 deaths in Europe and North America. Host Marco Werman discusses the origins and dangers of the drug with Caroline Copeland, director of the UK’s National Programme on Substance Use Mortality.