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Cat sick post-vaccine: fever, vomiting, tired, won't eat. What now?

Updated On September 23rd, 2025

Pet's info: Cat | Maine Coon | Female | unspayed | 6 months and 19 days old

Hello I took my cat to the vet yesterday for a vaccineand the vet said she might have a fever and vomit so prescribed a Medicine and when I got home I gave to her and after a little while she threw up, she looked so tired and won't move and then after a few hours I gave her some tuna and she threw it up so I didn't give her any other food then she couldn't sleep well at night, and today I gave her some water and some food she drank a bit but she refused to eat and she has a slight fever, help :/

1 Answer

Most Helpful Answer

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Answered By Daniel Fonza, DVM

Veterinarian

Published on October 20th, 2017

Hi there and thank you for using Pet Coach to address your concern. My suggestion would be to have the veterinarian who administer the vaccination recheck Suzie. Sometimes vaccination reactions can cause the symptoms you are seeing so it would be advisable to have her looked at so the reaction does not progress. Your vet can then administer medications to help treat a possible reaction such as benadryl and a steroid injection. I hope this helps and I hope Suzie gets better! Please let me know if you have any other questions or concerns. I am also available for consult if needed.

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