Adams Plus Flea & Tick Collar for Cats begins to kill fleas, ticks, flea eggs, and flea larvae immediately. Its full protection against ticks will be built up within a few days of placement on cat. Provides protection for up to 7 months. Do not use on kittens under 12 weeks of age. If used on pregnant or nursing cats, do not replace collar until kittens are at least 12 weeks of age. Contains 14.55% tetrachlorvinphos and 1.02% s-methoprene
