- Apr 19, 2011
- 264
- 5
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One capstar pill will kill fleas within 24 hours. But you will have to treat your house, possibly the yard and change flea prevention. I use Revolution, Advantage and Frontline Plus and switch each time I buy. I usually have off months (Dec, Jan and Feb) where we don't use anything. We just use DE around the perimeter of the yard and where we walk our dogs.