My cat is throwing up after UTI meds. Is it normal? ER or wait?
Updated On September 23rd, 2025
Pet's info: Cat | Domestic Shorthair | Female | spayed | 10 years old | 13 lbs
My cat was diagnosed with a UTI yesterday afternoon. She was prescribed Clavacillin (62.5 mg) and Onsior (6 mg). About 6.5-7 hours after her medicine she started throwing a foamy, yellow liquid and then all of her dinner. During the night, I woke up twice to her throwing up a foamy liquid with a slight color to it. I know the vet said the Clavacillin could upset her stomach but is this normal? Does she need to be brought to the ER or can she wait until her primary opens in a few hours?
2 Answers
Most Helpful Answer
Published on March 30th, 2021
Poor Rajah! It is very possible the med (or underlying illness) are upsetting her stomach. Vomiting up yellow foam/bile can also sometimes occur if the stomach is too empty and also upset. Offering several smaller bland meals (if she's stopped vomiting) may help reduce upset. That said, I would definitely let your vet know once they are open in case they want to adjust her dosage, have her brought in for supportive care (such as fluids or shots to reduce vomiting and dehydration) or change the med used entirely. If she's vomiting so much to the point she is weak and cannot move, seems in severe distress or pain, or otherwise is worsening rapidly, and your vet isn't open yet, seeking out ER care is best then.
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Related Answers from Veterinarians
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Published on November 6th, 2018
Usually not and these signs could be actually related to a gastrointestinal infection/inflammation. It is indeed possible that the UTI is due to stress secondary to the gastrointestinal problem, which is the primary problem to be solved or it may be that the antibiotics are upsetting her stomach. Another check up is indeed required if the sign do not resolve with few days of a bland diet based on boiled chicken or white fish and rice in small portions given 3 or 4 times daily for a week. Hope this answer was helpful, but please do not hesitate to contact us again on the forum or by requesting a consultation if you have any more questions or to discuss it any further. Please find the time to give us a feedback about the consultation as that will be used to improve our service.
1Pet Parents found this answer helpful
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