Kills fleas; ticks; chewing lice; flea eggs; flea larvae. Contains Fipronil and (s)-Methoprene, the active ingredients used in Frontline Plus for cats (Pronyl OTC Plus for cats is not manufactured by or distributed by Merial. Frontline Plus is a registered trademark of Merial). For use only on cats of all weights over 8 weeks of age. Controls flea reinfestation for up to 6 weeks. Waterproof. 3 month supply. Made in USA.