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My senior cat has uncontrolled hyperthyroidism, hypertension, and seizures. What now?

Updated On September 23rd, 2025

Pet's info: Cat | American Shorthair | Female | spayed

My cat went blind 4wks ago, also diagnosed with Hyperthyroidism/Hypertension. Methimazole has not worked yet. T4 level went up. Seizure or stroking started last week (multiple per day). Third eye coming out more often. Front legs get "locked." She twitches and does this tacking or spit like thing but nothing comes out. Sometimes moves very slow. Walks in circles. Will call out if she really isn't doing well. She is 14 yrs and 8 months old. Vet hasn't prescribed anything for seizures??? PlsHELP

2 Answers

Most Helpful Answer

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Answered By Dr. Leigh, DVM

Veterinarian

Published on November 1st, 2016

So sorry she is having these problems. It sounds like she should be re-examined by a veterinarian since her signs are not well managed. Your vet may need to add in a blood pressure medication and/or an anti-seizure medication, as well as adjust her thyroid medication. If your vet is not able to manage her disease than your could go to a different vet for a second opinion or even take her to a specialist for an evaluation. Please call your vet an give him/her an update.

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    Answered By Jennifer Summerfield, DVM CPDT-KA

    Veterinarian, Certified Dog Trainer

    Published on

    Poor Tink! I'm sorry to hear that she's having so many problems. The symptoms you describe could certainly be caused by hypertension due to the hyperthyroidism, so it sounds like some things probably need to be adjusted in her treatment plan. She may need an increase in her methimazole dose, and may also need to start on an anti-hypertensive medication such as amlodipine in the meantime to get her blood pressure under control ASAP. If her blood pressure is back in the normal range and she is still having neurologic episodes like this, then an anti-seizure medication could be considered. I would recommend calling your vet today to let them know what's been going on - they will probably want to see her back to recheck her blood pressure today and get her started on some new medication or make dosage adjustments depending on the results.

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