Revolution for Cats is a monthly parasiticide that provides treatment against a range of internal and external parasites including fleas, heartworm, ear mites, hookworm and roundworm. It is quick and easy to administer by simply squeezing the tube of ointment onto the back of your kitties neck, so they can't lick it off. It treats cats and kittens weighing between 2.6 and 7.5 kgs, from 6 weeks of age. Use only as directed on the label.