Sentry Fipro Guard MAX for Dogs topical flea and tick treatment contains the same veterinarian-recommended active ingredient, fipronil, found in Frontline brand Products. But with Fipro Guard MAX, the power of fipronil is maximized by adding a second active ingredient. The patent-pending combination of active ingredients starts to kill fleas and ticks in minutes, even faster than Frontline Plus. It works so fast, it stops reinfestation of fleas, ticks and chewing lice and maintains high efficacy for 30 days, Protecting pets and Homes. Frontline is a registered trademarks of Merial. Fipro Guard MAX is not manufactured by or distributed by Merial In independent studies comparing the efficacy of the combination of ingredients in Fipro Guard MAX to Frontline Plus, more fleas and ticks died within the first hour after application.