Xylazine, an animal sedative that is approved by the U.S. Food and Drug Administration (FDA) for veterinary use only, has made its way into the illicitly manufactured fentanyl (IMF) supply and has significantly increased in prevalence in recent years, likely due to its low cost, easy availability, and presumed enhanced “high.” Researchers reviewed pertinent xylazine research and pulled from their own clinical experience to offer new guidance on the care of patients exposed to this dangerous drug. Their review is published in Annals of Internal Medicine.