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Simparica is a chewable, flea and tick medication for dogs. It has a quick acting, long lasting formula that starts working within hours of application and keeps working for a full 35 days. Designed to prevent and control infestations in the home and break the lifecycle of fleas to kill before they lay eggs. Simparica also kills ticks, including those that may carry diseases. Simparica contains sarolaner, an insecticide that works safely in the bloodstream to kill insects by disrupting their neurological functions. For use in dogs 6 months of age and older weighing 2.8 pounds and greater. Available in sizes 2.8-5.5 lb, 5.6-11 lb, 11.1-22 lb, 22.1-44 lb, 44.1-88lb, 88.1-132 lb.