Both of those illicit fentanyl and carfentanil are very unsafe opioids that could lead to A fast overdose and Dying when abused, but carfentanil is much more potent than fentanyl. Multiple doses of your anti-overdose drug naloxone (Narcan) will not be effective to reverse an overdose. Carry on readingNEONATAL OPIOID WITHDRAWAL SYNDROME: Prolonged u