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.
4 Answers
Most Helpful Answer
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.
2Pet Parents found this answer helpful
Related Answers from Veterinarians
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Published on June 11th, 2019
The progression of the diarrhea from yesterday to today appears to be a little better (it looks like there is a lot of blood in the stool in the first picture). I would continue with your vet's treatment plan.
1Pet Parents found this answer helpful
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Published on February 23rd, 2019
Thank you for contacting Petco Pet Education Center, formerly Petcoach with your question about George. I’m sorry he isn’t doing well. Antibiotics can cause GI upset such as diarrhea, but I would be concerned about the blood as that isn’t a typical side effect of them. When dogs have diarrhea, their bowels become irritated and you can see some blood. I’d watch him for now, and if the bloody stools continue, then I would take him into the vet. I hope this helps!
1Pet Parents found this answer helpful
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Published on July 23rd, 2017
When two antibiotic are used there can be a reduction in some of the food bacteria in the gut. I would recommend giving Ralph daily probiotics such as over the counter Culturelle to help her the bacterial flora back balanced. If he is still having blood after 24-48 hrs then it's best to have him seen by your vet for further care. Best wishes and take care.
1Pet Parents found this answer helpful
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