Plus Flea Prevention for Cats, Cat and Kitten Treatment & Control, Small and Large, Fast Acting Waterproof Topical Drops, 2 Month SupplyACTIVE INGREDIENTS THAT WORK: Contains the same active ingredients as used in Advantage II for Cats* (imidacloprid & pyriproxyfen). FAST ACTING FLEA TREATMENT FOR CATS: Kills fleas within 12 hours of application, and prevents reinfestations by killing fleas before they lay eggs. NO BITE REQUIRED TO KILL: ADVECTA Pro for Cats topical flea prevention kills through contact. Fleas die without having to bite your cat. BREAK THE FLEA LIFE CYCLE: Effectively