The two illicit fentanyl and carfentanil are very dangerous opioids that will bring on a quick overdose and Dying when abused, but carfentanil is much more potent than fentanyl. Many doses in the anti-overdose drug naloxone (Narcan) may not be effective to reverse an overdose. Continue on reading throughFentanyl OD or W/D!!! Undecided, will need gu