The Amazon Basics Flea and Tick Treatment for Medium Dogs is comprehensive pest control and prevention designed for dogs weighing between 23-44 pounds. This flea and tick treatment for dogs starts working within 24 hours to tackle flea and tick infestations. Formulated with active ingredients Fipronil and (s)-methoprene to target flea eggs, flea larvae, biting flies, and chewing lice, the treatment breaks the flea life cycle and eliminates ticks, including those that may carry Lyme disease. This fast-acting, long-lasting treatment for dogs offers up to 30 days of continuous protection. Quality products for happy pets. Keep out of reach of children.