Seresto by Bayer HealthCare LLC
Seresto is an eight-month tick and flea preventative that is in collar form for both cats and dogs. It will kill fleas within 24 hours and ticks within 48 hours after initial application. Reinfesting fleas are killed within two hours and reinfesting ticks are killed as quickly as six hours. Seresto features a sustained release technology that allows for a continuous release of imidacloprid and flumethrin in low concentrations.