Cat's flea treatment not working. Can I safely apply Frontline now?

Question

I place Sentry Plus flea medication on my cats last Wednesday. The medicine does not seem to be working. Can I safely use Frontline now or do I need to wait one month to apply it? Pet's info: Cat | Domestic Longhair | Female | spayed | 10 lbs

Jenna Beyer, DVM, MBA, cVMA · Accepted Answer

Since both Sentry and Frontline use the same active ingredient (fipronil) it is unlikely that you will see better protection switching to the Frontline. You will need to choose a product with a different ingredient, like Advantage or Revolution or a Seresto collar. If you choose to use another topical, I would recommend bathing your kitty today to remove any remnants of the Sentry, and wait 3 days to apply the next topical. It is important to wait after bathing so that the natural body oils have time to coat the skin to ensure adequate absorption. You do not need to wait or bathe to use a Seresto collar.

Cat's flea treatment not working. Can I safely apply Frontline now?

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