Synthetic opioids: warning issued in NSW after nitazenes cause cluster of overdoses  The Guardian‘Severe opioid’ warning after chilling find  news.com.auOpioids more potent than fentanyl have been detected in Australia. So what are nitazenes?  The Conversation'Hundreds of times stronger than heroin': Severe overdoses trigger warnings in NSW  9NewsNSW Health issues warning on potent synthetic opioid overdoses  The Canberra Times