Kills fleas, ticks, flea eggs, flea larvae and chewing lice. Same active ingredients used in Frontline® Plus for Cats and same effectiveness. Protects cats from all stages of fleas to break flea life cycle and 4 species of ticks, including deer, American dog and brown dog ticks. Rapidly eliminates chewing lice. Studies show this product kills adult fleas for up to 6 weeks. Apply monthly if cat is at high risk for flea infestation, and to control ticks and chewing lice.