The Victorian Department of Health has issued a Drug Alert for protonitazene.
“A white powder sold in Melbourne as cocaine contains the potent opioid ‘protonitazene.
Protonitazene is a novel synthetic opioid that can produce life-threatening toxic effects in very small amounts”
Links:
https://www.health.vic.gov.au/drug-alerts/cocaine-adulterated-with-protonitazene
Includes a downloadable copy of the alert for distribution