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Advecta II for Cats (over 9 lbs.) contains the same active ingredients used in Advantage II for Cats. Advecta II is a convenient, easy-to-apply topical solution for the prevention and treatment of fleas on cats 8 weeks of age and older. Kills fleas on cats within 12 hours of application and continues to prevent reinfestations for up to 4 weeks. This is a waterproof, fragrance-free formula. EPA REG # 2596-181-91384.