(Sergeant's) FiproGuard Max for Cats contains Fipronil and Etofenprox. Provides premium protection against fleas, ticks, and chewing lice. It kills deer ticks that transmit Lyme disease as well as brown dog ticks, American dog ticks and lone star ticks. Starts killing fleas and ticks in as little as one hour. Fast-acting and long-lasting, sustained-release formula protects cats against flea infestations for up to six weeks. FiproGuard Max for Cats is for cats and kittens over 12 weeks of age. Waterproof.