Updated On September 23rd, 2025
Pet's info: Cat | Mixed Breed | Female | spayed | 11 years and 7 months old
Hello I took my female cat to the vet this morning with a suspected urine infection. How long does it take for the injected 14 day antibiotic to start working? She still has some blood in her urine but is not trying to use the litter tray as much. Thank you
2 Answers
Published on October 9th, 2017
I am sorry to hear about your kitty! Usually it will take a few days for the antibiotics to show marked improvement. That being said, urine in the blood if there was a large amount may take a few days more to improve. If her other symptoms (urinary urgency or accidents) are improved I would be less concerned. If at the end of the week she is still having blood I would let your vet know as they may want to check for things like a bladder stone or mass which could be causing bleeding.
1Pet Parents found this answer helpful
Published on June 30th, 2019
Thank you for submitting your question regarding Kitty. I would definitely extend the antibiotics if they seemed to be helping initially. It can be difficult to get the concentration of the antibiotics high enough in the urine to treat the infection. I will sometimes treat a patient for 3 weeks. I hope this information helps!
1Pet Parents found this answer helpful
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