My cat got underdosed Frontline. Can I reapply safely for fleas?
Updated On September 23rd, 2025
Pet's info: Cat | Mixed Breed | Male | neutered | 17.8 lbs
I applied Frontline plus on my cats 2 weeks ago and I thought they were only 6lbs. Today i weighed them and learned they're actually 17lbs. Can i apply a new dose for their correct weight? We still clearly have a flea problem.
2 Answers
Most Helpful Answer
Published on March 5th, 2020
Yes it is safe to reapply most topical flea preventatives every 2 weeks if needed. This should be fine and safe to do since you are 2 weeks out. However, if you are still seeing fleas after this correct dosing, it is best to consider switching to a more effective product such as Revolution. Best of luck with your cats moving forward and keeping the fleas away. Take care.
1Pet Parents found this answer helpful
Related Answers from Veterinarians
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Published on October 20th, 2017
Yes, you can safely apply every 2 weeks if needed. However, frontline does not repel so the fleas that are in the environment will still have to get on Molly in order to be affected by the frontline, so there is chance the flea just ingested the medicine and you found the flea prior to it killing the flea
2Pet Parents found this answer helpful
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