Frontline Plus contains fipronil, which spreads via the body oils killing fleas within 24 hours and ticks within 48 hours. Ticks are generally killed before they bite, decreasing the risk of tick-borne disease transmission. Frontline Plus also contains (S)-methoprene, an Insect Growth Regulator, which prevents an insect from maturing or reproducing. Approved for use on kittens 8 weeks and older.
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