Both equally illicit fentanyl and carfentanil are particularly hazardous opioids that could produce A fast overdose and death when abused, but carfentanil is more powerful than fentanyl. Numerous doses of your anti-overdose drug naloxone (Narcan) may not be effective to reverse an overdose. Carry on looking throughNEONATAL OPIOID WITHDRAWAL SYNDROM