A dangerous mix of Fentanyl and animal tranquilizer ‘Xylazine’, known as “Tranq Dope,” is being sold in the US. Xylazine, an animal tranquilizer, is known for destructive effects on people’s skin. The substance is being used as a synthetic cutting agent for opioids like heroin and is causing outbreaks of skin infections and overdoses in major cities across the country.