The Advantage Topical Cat Flea Treatment and Prevention For Large Cats, 9 lbs+. is a purr-fect choice for your smaller furbaby. This topical flea prevention and treatment works to kill fleas fast and prevent new infestation. It helps kill adult fleas on your cat before they lay new eggs, treating existing flea infestation and preventing further infestations for up to four weeks. What’s more, this treatment is fragrance free, waterproof, and available without a prescription. It’s designed for cats above 9 lbs and at least eight weeks of age.