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Why is my cat lethargic and sneezing after antibiotics and shots?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 6 years and 10 months old

My cat (M 6y/o) recently went to the vet and was diagnosed with an ear infection, along with getting his yearly shots. He was given an antibiotic to treat the infection but now (a few days later) he's acting very lethargic and is having sneezing fits. Today, he only got up a couple of times to eat then he want to lay down in the same spot he's been in all day. We called his vet and she said to take him off of his medication and see how he's doing tomorrow, but I'm very worried.

1 Answer

Most Helpful Answer

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Answered By C. Rathjens, DVM

Veterinarian

Published on November 6th, 2018

I think your vet's response was the correct one. All antibiotics carry a risk of intestinal upset and vaccines can certainly make pets feel "off". If he's not feeling better tomorrow, he needs to go back in to the vet.

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