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My cat has bloody diarrhea after antibiotics. Is it from irritation?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Male | neutered | 1 year and 2 months old | 11 lbs

Hi, My cat was on antibiotics for 2 weeks because of a cat flu. He started to have diarrhea a few days ago just right before his antibiotic course was coming to an end. 2 days ago his course was done and the diarrhea still there but now with a little bit of fresh blood. I know now that antibiotics can cause diarrhea but the diarrhea that present for a few days could cause bleeding because of the irritation ? Otherwise my cat is healty, never had diarrhoea or any other healthy issues.

1 Answer

Most Helpful Answer

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Answered By Susan England-Foster

Veterinarian

Published on July 14th, 2017

It is very possible the blood is from the irritated colon. The colon gets irritated secondary to the diarrhea. You can try an over the counter probiotic to help good bacteria return to the colon and help stop the diarrhea. If the diarrhea does not resolve he needs to see a vet for possible stronger medications.

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