Xylazine , a large animal tranquilizer, has been associated with increasing numbers of overdoses. It is often laced in drugs sold on the streets such as heroin or fentanyl. Xylazine is a medicine used to sedate animals. Learn about possible risk of death in humans who take it. Xylazine is a non-opioid sedative or tranquilizer. Xylazine is not approved for use in people. Xylazine , or tranq, is increasingly being mixed with drugs like fentanyl or heroin and can be difficult to detect. Most people who use drugs are unable to tell if they have been exposed to it.
