Simparica 40mg Chewable Tablets are tasty chewable tablets used to treat tick, flea and sarcoptic mange infestations in dogs weighing >10kg – 20kg for up to 5 weeks.Simparica works by entering your dog’s bloodstream and due to the nature of its active ingredient ‘Sarolaner’, it becomes an ectoparasiticide to effectively kill any parasite living on the skin or fur of your pet.Once the parasite begins feeding, the treatment will begin to affect their nervous system, inducing paralysis and killing them before they have a chance to lay eggs.