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Why am I still seeing flea eggs after Frontline Plus on my cat?

Updated On September 23rd, 2025

I just want to know if after applying flea treatment if the flea eggs I still see where my cat lays are just not viable anymore or if there was a screw up in treatment. I used Frontline Plus on 7/6 three days after bathing and combing my 25lbs cat. I vacuum my house daily and I've used upholstery sprays too

3 Answers

Most Helpful Answer

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Answered By Anna M., DVM

Veterinarian

Published on July 12th, 2017

Hello! Theoretically, Frontline Plus should kill flea eggs as well as adults, so if you are seeing flea eggs they should be dead. However, Frontline Plus is not my first choice for an active flea infestation, as some of the other products (Bravecto, Revolution) work better in my experience. I recommend treating monthly for at LEAST 3 months, and keep doing what you're doing to treat the environment. Consider using a different product for next month's treatment if you're not seeing a significant reduction in the fleas. Hope this helps!

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Other Answers

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    Answered By Dr. Melanie, BVSc MS

    Veterinarian

    Published on May 26th, 2019

    If you didn't disinfect the environment, then yes. Fleas live in the environment, not on the cat, they just jump on to feed and then jump off. In addition, I have seen some resistance to Frontline. I will give you a flea treatment for Luna. First, I would give her Capstar. It's a one time pill that starts killing fleas within 30 minutes. Then follow up with a spot on treatment, such as Advantage or Revolution. This is a treatment that has to be used once a month. You will also have to disinfect the environment. Wash her bedding in hot soapy water, and vacuum the furniture and carpet surfaces. You can use a spray to kill fleas in the house, such as Indorex, or a flea bomb would work well to kill the fleas in the home. Best of luck.

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    Answered By Linda G, MS, DVM

    Veterinarian

    Published on September 5th, 2017

    Hello, thank you for using Petco Pet Education Center, formerly Petcoach. If Piper had an enormous number of fleas, or his environment is absolutely flea infested, then yes, you could still be seeing fleas on him. If you want to increase the flea kill rate on Piper, you can either administer a Capstar tablet ( available OTC ), pick up a Comfortis flea pill from your veterinarian, use a flea spray labeled for cats, place a Seresto Collar on Piper ( I love these ) or bathe Piper in a flea shampoo. If Piper is indoors, please do not forget to treat the house both with a spray & a fogger containing IGRs ( Insect Growth Regulators ). Sometimes it takes time for flea products to work, & it can take 3 months to wipe out a flea infestation. Take care..

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