Bio Spot Defense Flea & Tick Spot On for Cats - 5 lbs & Over 3 pack For use on cats & kittens 5 lbs and over and 12 weeks of age or older. Kills fleas, deer ticks, flea eggs, flea larvae & mosquitoes. Starts killing fleas & ticks within 15 minutes. Formulated with an Insect Growth Regulator to break the flea life cycle. Contains lanolin to help condition coat.