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Advantage II for Cats 9-18 lbs, 6 Month (Purple) is a topical flea control product that protects pets for 30 days with a single application. The two main ingredients, imidacloprid and pyriproxyfen, work together to kill adult fleas, eggs, and larvae. Because feline Advantage II kills immature fleas instead of just adults, it breaks the flea life cycle. This destroys the next generation of parasites and prevents future infestations. One monthly application provides your cat with effective flea control.