Adams Flea & Tick Spot On for Cats is a long-lasting flea and tick treatment specifically formulated for cats. It contains an insect growth regulator (IGR) to kill fleas before they hatch, preventing flea eggs from maturing into biting adults. It kills adult fleas and Deer ticks and repels mosquitoes. Breaks the flea and tick lifecycle by killing flea eggs and flea larvae before they hatch. This long-lasting and quick-drying formula is effective for 30 days. Application is easy; just squeeze this spot-on treatment onto your cats skin between the shoulder blades.(S)-Methoprene 4.05%, Etofenprox 45.00%, OTHER 50.95%"