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Vibrac Fipronil Effipro Spot-on Solution for Cats External use only. For convenient, quick-acting, long-lasting, effective control of fleas, ticks, mosquitoes and chewing lice. EFFIPRO® Topical Solution for Cats contains the active ingredient fipronil, which controls infestations caused by fleas, ticks, mosquitoes and chewing lice on cats 8 weeks old or older. Effective monthly application for cats and kittens against fleas and ticks that is quick drying, non-greasy and available from licensed veterinarians. EFFIPRO Topical Solution for Cats remains effective after bathing, water immersion or exposure to rain or sunlight.