Equally illicit fentanyl and carfentanil are extremely harmful opioids that could lead to a quick overdose and Dying when abused, but carfentanil is more potent than fentanyl. Various doses from the anti-overdose drug naloxone (Narcan) will not be effective to reverse an overdose. Proceed examiningRe: Really Freaked Out!! Fentanyl OD or W/D, Undeci