SENTRY Fiproguard delivers protection against fleas, ticks, and chewing lice. Fiproguard is an effective, affordable way to protect your cat from fleas, ticks and chewing lice for 30 days. Contains Fipronil, an active ingredient used in FRONTLINE brand products. For cats and kittens over 1.5 lbs, 8 weeks of age or older. Waterproof. Packaged in the USA.