Both illicit fentanyl and carfentanil are very dangerous opioids which will cause a quick overdose and Dying when abused, but carfentanil is a lot more powerful than fentanyl. Numerous doses of your anti-overdose drug naloxone (Narcan) will not be effective to reverse an overdose. Proceed studyingRe: Definitely Freaked Out!! Fentanyl OD or W/D, Und