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Flea treatment not working after 2 weeks? Can I reapply early?

Updated On September 23rd, 2025

Pet's info: Dog | Yorkshire Terrier | Female | spayed

Can I reapply flea treatment early? It’s been 2 weeks with no results.

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2 Answers

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on August 22nd, 2016

A [flea](https://www.petcoach.co/article/fleas-life-cycle-anatomy-disease-transmission) infestation on your pet or in your home can be [difficult and frustrating](https://www.petcoach.co/article/why-are-fleas-so-hard-to-kill) to deal with. Yes, if after two weeks the [flea preventive you applied isn't working](https://www.petcoach.co/article/6-reasons-your-flea-prevention-isnt-working), you can reapply flea treatment early, or switch to another brand. I recommend using Advantix or a chewable prescription product from your vet, like Bravecto, Nexgard, Simparica, or Credelio. This recommendation is unrelated to Petco or PetCoach. If you are seeing fleas on Mia now, you can give her Capstar ([Nitenpyram](https://www.petcoach.co/pet-medication/nitenpyram)). It's a one time pill that starts killing adult fleas in 30 minutes and is safe to use with a topical treatment. Use a monthly preventive on all pets for at least 3 consecutive months to break the flea life cycle. Year round use is preferred. You will also have to [treat the environment](https://www.petcoach.co/article/5-tips-to-get-rid-of-fleas). Wash all bedding in hot soapy water, and vacuum the furniture and carpet surfaces. Discard of the bag or empty the canister outdoors immediately afterwards. Use a spray, such as Indoorex or Knockout ES, in the house and to prevent reinfestation.

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    Answered By Megan, DVM, CVA

    Veterinarian

    Published on September 23rd, 2019

    No 3 weeks should be fine. If you are still seeing fleas, then you likely have an infestation in your house and yard. Be sure all pets in and out of the house are also on flea preventative. I would also be sure to treat your house and yard for fleas since fleas actually live in the environment and not on the animal. You may also consider trying a different flea preventative like bravecto or cheristan for cats. I hope this helps!

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