Fleas and ticks are a nuisance for cats and pet owners alike, and they can also carry disease and cause allergic reactions that endanger a cat's health. Topical flea and tick meds for cats work by killing existing fleas and ticks and repelling pests that try to re-infest the cat. Some also inhibit flea eggs and juvenile fleas from developing into adult fleas, halting the infestation in its tracks. Topical flea and tick medicine is applied directly to the cat's skin, typically at the back of the neck where the cat can't lick it off. Topical flea and tick treatments include Advantage II, ProMeris, TriForce, Frontline Top Spot and Frontline Plus. Oral flea treatments for cats work from the inside out, killing fleas and preventing their eggs from developing. Because they are ingested, they work all over the cat's body at the same time. Oral products only kill fleas, not ticks. Oral flea treatments for cats include Program Flea Control and Capstar. HealthyPet's great prices on flea and tick meds makes it easy to keep your cat free of pests.