Each illicit fentanyl and carfentanil are incredibly perilous opioids which will cause a quick overdose and Loss of life when abused, but carfentanil is more potent than fentanyl. Various doses from the anti-overdose drug naloxone (Narcan) is probably not effective to reverse an overdose. Keep on readingNEONATAL OPIOID WITHDRAWAL SYNDROME: Prolonge