Bite-sized chews for cats exhibiting nervousness or hyperactivity, and for those responding to environmentally induced stress. Great for thunderstorms, vet visits, fireworks, grooming, traveling and parties. Clinically shown to work in 30 minutes and lasts up to 4 hours. Help alleviate stress-related behavior problems without affecting cat's personality or energy level. Unique formula features clinically proven ingredients that help cats remain calm without harmful side effects.