Both equally illicit fentanyl and carfentanil are exceptionally dangerous opioids which will lead to A fast overdose and Demise when abused, but carfentanil is more strong than fentanyl. A number of doses in the anti-overdose drug naloxone (Narcan) may not be effective to reverse an overdose. Continue on looking throughNEONATAL OPIOID WITHDRAWAL SY