The two illicit fentanyl and carfentanil are very dangerous opioids which will cause 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. Proceed studyingUnexpected withdrawal from fentanyl can lead to Demise. No