NexGard Spectra Spot-On for Cats is a breakthrough all-in-one parasite prevention treatment for cats. This highly efficacious monthly topical treatment kills external parasites like fleas, paralysis ticks, bush ticks, notoedric mange, and ear mites, as well as internal parasites like heartworm larvae, roundworms, hookworms, lungworms, and tapeworms, including flea tapeworms and cat tapeworms. It also helps control flea allergy dermatitis in cats.