DescriptionInside the unique polymer matrix of Seresto® are two active ingredients: Imidacloprid has been used for many years to protect pets against fleas, and global monitoring has shown it’s as effective as ever.Flumethrin effectively kills ticks (dogs only). Flumethrin works together with imidacloprid to provide enhanced activity against fleas. The active ingredients spread from where the collar contacts the skin, over the entire skin surface of your cat. Sustained release technology Seresto® is an innovative polymer matrix collar that offers a continuous supply of two active ingredients – imidacloprid and flumethrin. Low doses of these actives are released from the matrix, as needed, over time and migrate into the lipid (fatty/oily) layer of your cat’s skin and hair. Actives are not significantly absorbed through the skin, but remain within the naturally water-resistant, lipid layer of the skin and hair. The actives in the skin and hair of your cat kill fleas on contact, not relying on biting to be killed. The hair and dead skin that your cat sheds naturally each day contain small amounts of actives, killing flea larvae that may live in your cat’s surroundings.
