An excellent value from Advantage, a leading brand that has been trusted to protect cats from fleas for more than 20 years. Advantage for Cats provides flea treatment and prevention for all cats over 8 weeks of age. Easy-to-apply monthly topical treatment - no hard-to-swallow pills, no prescription needed Same-day effectiveness - kills fleas on contact within 12 hours of application and keeps working for 30 days Fragrance-free formula, waterproof after 24 hours of application. 2 Monthly Doses