The Revolution Plus Cat Tick, Flea and Worm Spot-On Treatment is a safe and effective way of preventing or killing off fleas, ticks, ear mites, roundworms, heartworms and hookworms. It is a simple-to-apply, quick-drying, small volume, 6-in-1 broad spectrum monthly Topical Solution for cats. The Revolution Plus kills fleas within 6 hours of applying it and begins to kill ticks within 24 hours of application. It will prevent heart-worm development and eliminates and controls ear mites and other worms. This Cat Tick, Flea and Worm Spot-On Treatment will leave your cat in a good condition and free from the fighting and suffering against internal and external parasites. The active ingredients are selamectin & sarolaner, which starts killing fleas within 3 hours and ticks within 8 hours.