Sargeants/Sentry - Fiproguard Flea & Tick for Cats. The first retail generic equivalent to Frontline Top Spot for cats, FiproGuard contains Fipronil the active ingredient used in Frontline Top Spot for cats. FiproGuard topical flea and tick squeeze-on for cats provides three-way protection that kills fleas, ticks, and chewing lice. It kills deer ticks that may transmit Lyme disease as well as brown dog ticks, American dog ticks and lone star ticks. Can be used on breeding, pregnant, and lactating cats. Fast-acting and long-lasting, sustained-release formula protects cats for up to 30 days.