A common reaction after cat triple therapy is that the cat has no energy and likes to lie down in one place and rest quietly. Some cats will have a loss of appetite and won’t eat much. They will usually recover on their own within a day or two. There are also cats that have no reaction at all and the vaccine has no effect on them.

Some cats have poor physical constitution and may develop allergic symptoms, such as redness and swelling at the vaccination site, vomiting, diarrhea, etc. The owner needs to take the cat to a pet hospital for a desensitization injection.