My cat is tired and not eating after vet allergy shot, why?

Question

I have a 5yo cat who was totally healthy. We went to see a vet for a general check up , I mentioned that the cat sneezed a few times in the past month and the dr have him an allergy injection. It’s been three days and my cat is less energetic, less affectionate and doesn’t eat as much. The DR also gave as an antibiotic and we are on our third day out of ten. Could the injection have this affect on him or why did his behavior change right after he got it ? Pet's info: Cat | Russian Blue | Male | neutered | 5 years and 5 months old

Linda G, MS, DVM · Accepted Answer

Hello. I am sorry Simba is not feeling well. It is possible that Simba was incubating, or had a low-grade infection. The allergy shot was actually a steroid injection that lowers the ability of the immune system to respond to an infection, essentially making the infection worse. So, this is not a behavior change, Simba just is under the weather. Hopefully, the antibiotics will keep things from getting worse, but if Simba does not pick up in a couple of days, please call your veterinarian. He may need a change in antibiotics, or be placed on an antiviral medication. As long as he is eating a little each day, he will be OK, but if he refuses all food, have him seen as soon as possible. I hope Simba is feeling better soon. Thanks for using Petco Pet Education Center, formerly Petcoach.

My cat is tired and not eating after vet allergy shot, why?

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