Comfortis RX, 3.3-4.9 lb Dogs/2-4 lb Cats, 6 Count, Yellow

Flea & Tick Prevention, Comfortis is the first FDA-approved, chewable tablet that kills existing fleas on your pet within 30 minutes. That means Comfortis kills fleas before they can lay eggs on your pet. Comfortis lasts a full month and contains an environmentally friendly active ingredient, so you can feel good about what your giving your pet!