emcdda.europa.eu/publications/drug-profiles/fentanyl Fentanyl Fentanyl source Fentanyl profilo della sostanza reports profilo della sostanza most powerful commercial opioid lethal "Fentanyl drug profile" so powerful two milligrams of fentanyl Fentanyl drug profile 2 milligrams reports lethal dosage is about 2mg Fentanyl (En) "Fentanyl drug profile" Fentanyl#Non-pharmaceutical fentanyls Illegal forms "Fentanyl drug profile" Fentanyl drug profile Illegal forms EMCDDA: Fentanyls more than 10,000 doses milligrams is a lethal dose about 2mg Fentanyl lethal dose of fentanyl in humans