Frontline Plus for cats is the most popular and effective flea treatment. Loaded with insect growth regulator ingredient, the topical treatment kills fleas within 12 hours and destroys flea eggs and larvae by restricting their growth. The spot-on destroys chewing lice within 24 hours of application. Eliminating all life stages of fleas, the topical solution prevents flea infestation. Protecting cats for one full month, Frontline Plus prevents flea infested diseases and sarcoptic mange infection.