What is Xylazine Hydrochloride ?

Xylazine hydrochloride is α2 class of adrenergic receptor agonist with sedative, analgesic, and muscle relaxant properties. As with other α2 agonists, adverse effects include bradycardia, conduction disturbances, and myocardial depression. 
Xylazine hydrochloride is approved for use in dogs, cats, horses, deer, and elk. It is indicated in dogs, cats, and horses to produce a state of sedation with a shorter period of analgesia, and as a preanesthetic before local or general anesthesia. Because of the emetic action of xylazine in cats, it is occasionally used to induce vomiting after ingesting toxins.