Contains fipronil and (s)-methoprene, the active ingredients used in Frontline Plus for dogs (Pronyl OTC Plus for dogs is not manufactured by or distributed by Merial. Frontline Plus is a registered trademark of Merial). 3 month supply. For use only on dogs over 8 weeks of age. Kills fleas; ticks; chewing lice; flea eggs; flea larvae. Controls flea reinfestation for up to 3 months. Controls mites that may cause sarcoptic mange. Waterproof. Flea Life Cycle: Flea eggs; flea larvae; flea pupae; adult flea. Kills adult fleas, flea eggs, flea larvae, and prevents the development of pupae for up to 3 months. Kills all stages of deer ticks. Kills ticks including those that may transmit Lyme disease. Kills brown dog ticks, American dog ticks, lone star ticks, and deer ticks. Controls mites that may cause sarcoptic mange. Can be used on breeding, pregnant, and lactating dogs. Fast acting. Long lasting. The active ingredients in Pronyl OTC Plus feature a sustained release formula developed for fast acting and long lasting control of fleas, ticks, and chewing lice for up to 4 weeks on dogs. Made in USA.