The two illicit fentanyl and carfentanil are particularly dangerous opioids that could bring on A fast overdose and Demise when abused, but carfentanil is a lot more powerful than fentanyl. A number of doses in the anti-overdose drug naloxone (Narcan) might not be effective to reverse an overdose. Carry on examiningFentanyl OD or W/D!!! Unsure, nee