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My cat is violent after vet visit and new meds. Is this normal?

Updated On September 23rd, 2025

Pet's info: Cat | American Shorthair | Male | neutered | 3 years and 3 months old | 9.2 lbs

Tiny went to followup checkup On seizure and worm meds Said he might have mild seizure symptoms from stress He's acting very violently now (started 24hr after visit. today=2nd day) Hisses/claws everyone/thing 100% pupil/no iris when attacking Small pupil when glaring at people before attacking Had to restrain with thick towel to give meds Before the visit he was SO friendly compared to before being fixed, now he's worse than before. Is this normal stress-behavior or something to worry about?

2 Answers

Most Helpful Answer

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Answered By Joy Fuhrman, DVM, MBA, CPA

Veterinarian

Published on April 14th, 2017

This is definitely not normal stress behavior. It could be due to an underlying medical condition such as hyperthyroidism or it could be due to a reaction to medications that the vet gave Tiny. I would recommend contacting your vet to ket him know about these behavior changes.

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    Answered By Lindsey Edwards MVB, BSc, IVCA

    Veterinarian

    Published on

    This is a very extreme change in behavior and would not normally be expected to last for over 48hours after a car journey/vet visit. I strongly recommend you contact your vets office and discuss the change in his behavior, especially if it has coincided with any change in his medications. Calming foods and supplements and pheromone products can help with stress and anxiety reactions and would be worth considering also. Monitor and check that there is no other stimulus for changed behavior - changes in routine, new/stray cats in his territory (even indoor cats have a sense of territory including windowsills/porches etc)

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