An excellent value from Advantage, a leading brand that has been trusted to protect cats from fleas for more than 20 years Advantage for Large Cats provides flea treatment and prevention for large cats over 9 lbs., at least 8 weeks of age Easy-to-apply monthly topical treatment – no hard-to-swallow pills Same-day effectiveness – kills fleas within 12 hours of application and keeps working for 30 days Fragrance-free and waterproof formula