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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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1 Answer

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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