Advecta II Flea Treatment, 4 Month Supply BREAK THE FLEA LIFE CYCLE: Effectively breaks the flea life-cycle by killing all life stages of fleas: adults, eggs and larvae ACTIVE INGREDIENTS THAT WORK: Contains the same active ingredients as Bayer Advantage II for Cats (pyriproxyfen & imidacloprid) FLEA TREATMENT FOR CATS: Kills fleas within 12 hours of drops application, and prevents reinfestations for up to 4 months CONVINEINT AND EASY TO USE: Advecta II Flea Treatment for Cats is an easy to apply topical solution for the prevention and treatment of fleas in cats. WATERPROOF, FRAGRANCE-FREE FORMULA: Flea medication remains effective & provides protection even if your pet gets wet