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My 5-year-old cat keeps throwing up. Is it the expired medicine?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 5 years and 11 months old | 12 lbs

I have an inside cat. He is 5 years old. He has thrown up 6 times in the last 24 hours. Yesterday morning, I gave him a pink medicine that has to stay refrigerated that I got from the vet a couple months ago for when he breaks out in rashes. It expires 12-2018. He threw up 30 min after the medicine was given, twice. He threw up again at 4pm twice and again at 3:30am twice. Gums are normal colored. No blood in vomit or stools.

2 Answers

Most Helpful Answer

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Answered By David Elbeze, DVM, MRCVS

Veterinarian

Published on March 18th, 2018

It sounds as Tiger is suffering from a gastrointestinal condition, possibly an infection. it could also be due to medication you gave him. i would recommend taking him to the vet the first chance you get, he will need to be checked first, if the vet thinks it's a simple gastrointestinal infection he will need an anti vomiting injection, antibiotics and a special food for a few days in order to get better.

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1Pet Parents found this answer helpful

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    Answered By Vanessa Yeager DVM MPH

    Veterinarian

    Published on September 12th, 2017

    Hi there and thank you for your question on Petco Pet Education Center, formerly Petcoach! Vomiting can be a sign of a health condition, especially if it is happening more frequently. It can be a sign of a wide variety of health conditions so it is hard to say exactly what the problem is without examining Tiger first. Kidney or liver disease can cause nausea as can certain gastrointestinal disorders such as IBD or food allergies. Certain cancers can cause vomiting as well. My best advise is for you to take Tiger to see his veterinarian for an exam and blood work to determine if there is anything serious causing the vomiting. I hope this helps!

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