Simparica Chewables for Large Dogs is a comprehensive ectoparasitic treatment for dogs. This monthly chewable treatment is recommended for use in 8 weeks and older puppies and dogs, weighing between 20.1-40kg. It treats, controls and prevents flea infestations and controls flea allergy dermatitis. It treats and controls three types of Australian ticks including paralysis ticks, brown dog ticks and bush ticks. The active component sarolaner, quickly gets absorbed into the bloodstream and starts killing fleas within three hours and ticks within eight hours.