SENTRY Fiproguard Max Flea and Tick Tocial for Cats, 1.5 lbs and over, 1 count SENTRY FIPROGUARD MAX contains fipronil, the same active ingredient used in Frontline brand products Starts to kill both fleas and ticks in as little as one hour Stops and prevents reinfestations of fleas, ticks and lice Kills fleas that may cause flea allergy dermatitis, flea bite anemia and tapeworm infestation Convenient, once-a-month application