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In addition to killing and repelling adult fleas, ticks and mosquitoes, FleaTrol contains Precor IGR (Insect Growth Regulator), a formula that kills flea eggs before they hatch to effectively break the flea life cycle and help prevent reinfestation. Kills adult fleas for seven days without stinging sensitive skin. Safe for puppies and kittens over 12 weeks of age. Safe for use in conjunction with other Zodiac products. Active ingredients: Tetrschlorvinphos, (S)-Methaprene.