Advantage Multi for Cats is a once a month topical solution used for the prevention of heartworm disease, kill adult fleas, treat flea infestation and treat and control ear mites and intestinal parasites including hookworm and roundworm in cats and kittens 9 weeks of age or older and weighing 2 lbs or more. See the GoodRx for Pets Flea and Tick chart to find which flea and tick product is best for your pet. Also check out our Heartworm Disease Chart for more information on what medicine is best for your cat.