Protonitazene sold as ketamine20 Jun 2022VICHeroin & other opioids KetamineNote: yellow powder containing the potent opioid ‘protonitazene’ has been mis-sold as ketamine in Melbourne. Protonitazene is a novel synthetic opioid Opioids are central nervous system depressants. They typically produce a range of effects including sedation, short-term pain relief, and respiratory depression (breathing difficulty). Respiratory depression often appears more quickly with novel synthetic opioids (NSOs), increasing the risk of life-threateningRead notification