SENTRY Fiproguard MAX is a topical flea and tick treatment that contains the same veterinarian-recommended active ingredient, fipronil, found in Frontline® brand products.* But with Friproguard MAX, the power of fipronil is maximized with the addtion of a second active ingredient. It's so fast and effective, it prevents reinfestation from fleas, ticks and chewing lice. That speed and power remain throughout the entire month, protecting your pets and your home for 30 days. Choose from four products for dogs by weight range or the product for cats.