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Updated on September 23rd, 2025
Pet's info: Cat | Mixed Breed | Female | spayed
Hi. We applied Advocate flea treatment to both of our cats this evening. A couple of hours later one of our cats licked the treatment site of the other cat. Do we need to take her to an emergency vets or keep an eye on her?
4 Answers

Answered By Dr. Davis
Veterinarian
Published on October 15th, 2017
Answered By Angel Alvarado, LVT
Licensed Veterinary Technician
Published on June 2nd, 2018
Monitor for lethargy, drooling, vomiting or tremors. A small amount may result in some minor gastrointestinal upset. You can usually manage it with a short fast, 12 hours, followed by a bland diet in small, frequent amounts until symptoms resolve.
A larger amount ingested may cause more severe signs requiring veterinary attention for decontamination and supportive care as indicated by symptoms.
1Pet Parents found this answer helpful
Answered By Dr. Melanie, BVSc MS
Veterinarian
Published on April 26th, 2017
Oh no, thats not good that they are licking at the flea treatment. Yes, you are correct that ingesting this can have serious side effects, and I would immediately wash off the medication as much as possible to keep them from licking at it and rinse out their mouths as well. Then keep an eye on them for signs of toxicity which include drooling, vomiting, diarrhea, incoordination, muscle tremors, ear twitching, and lethargy. Should you see any of those signs, take them into a vet immediately.
Because you had to wash off the Advantage, you won't be sure how much was absorbed in their skin so I would not reapply any more Advantage for another two weeks. You can give them Capstar, which is a one time pill that starts killing fleas in 30 minutes. You can also give them an oral medication such as Comfortis.
1Pet Parents found this answer helpful
Answered By Angel Alvarado, LVT
Licensed Veterinary Technician
Published on September 27th, 2019
A small amount should not cause a serious problem. You may see some drooling or minor stomach upset (vomiting or diarrhea). Monitor for lethargy, tremors, ataxia (wobbly gait) or loss of appetite. These are symptoms that should be addressed by your veterinarian.
6Pet Parents found this answer helpful