Both equally illicit fentanyl and carfentanil are particularly risky opioids which could bring about a quick 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. Proceed readingFentanyl For Sale Online. Fentanyl Fo