The two illicit fentanyl and carfentanil are very dangerous opioids which will cause a quick overdose and Demise when abused, but carfentanil is much more potent than fentanyl. Various doses on the anti-overdose drug naloxone (Narcan) might not be effective to reverse an overdose. Proceed studyingRe: Definitely Freaked Out!! Fentanyl OD or W/D, Uns