Public health warning: tablets sold as MDMA (Ecstasy) found to contain a potent opioid Jan 30, 2024 NSW Health is warning of the dangers of tablets which are being sold as MDMA (ecstasy) and found to contain a potent opioid (nitazene). Three people presented to Sydney hospitals over the past weekend, after taking as little as half a tablet. One patient was admitted to the ICU and has since been discharged home.