According to the product description:
Quote:
Within 12 hours of application, 98-100 percent of fleas are dead. The second active ingredient, pyriproxyfen, is an insect growth regulator. Once a female flea lays her eggs, pyriproxyfen works to prevent the eggs from hatching, ending the flea life cycle.
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So it she treated him 2 weeks ago, you should be okay.
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