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Alyssa from Keokuk writes

How long should I wait between applications of Permethrin SFR inside before fleas die, and how often can it be used?

Treated house, yard, and dogs in same day yet still see fleas that night on dogs and furniture. Not sure if I did something wrong, managed to miss a few, or what.


For flea control, we recommend retreatment with insecticides such as Permethrin SFR every 14 days until you have no more signs of fleas. Most successful flea treatment programs require at least 2-3 treatments at 14-day intervals using both an insecticide for the adult fleas and an Insect Growth Regulator (IGR) to prevent immature stages of fleas from developing into breeding adults. You will not be able to make just one insecticide application for fleas and never see them again, especially if you did not use an IGR in your treatment. Fleas multiply very quickly, and they have an immature stage that is protected from insecticide, so new fleas will continue to emerge after you have treated. Be sure, also, that you are vacuuming every day or every other day to help pick up adult fleas, flea dirt, and eggs, and also to stimulate those immature fleas so the adults will emerge and be exposed to the insecticide you have put down. We have more tips and details in our Flea Treatment Guide here.

Answer last updated on: 09/26/2019

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Permethrin SFR 36.8%

Permethrin SFR 36.8%

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