Xylitol is a sugar substitute commonly found in gum, candies, and other sweet products. Xylitol is safe for humans, but is very toxic to cats. Even small amounts of xylitol can result in hypoglycemia, seizures, liver failure, or even death in cats. Symptoms of xylitol consumption appear within 15-30 minutes of consumption, and include vomiting, lethargy, incoordination, termors, seizures, and coma. Although cats usually avoid xylitol on their own, if you suspect that your cat has consumed xylitol, contact your veterinarian or Pet Poison Helpline (800-213-6680) immediately.