Revolution is a topical liquid medication, effective in preventing heartworm disease, killing fleas, and treating and controlling ear mites and sarcoptic mites. Applied once a month at one spot on the skin (typically between the shoulders), Revolution Feline works particularly well for cats because they tend to lick and clean themselves often which helps spread the prevention ingredient. It works continuously throughout the month to help control fleas, ticks, ear mites, heartworms, hook and round worms too. Bid here for a 6-month supply!