I just diagnosed a cat with acquired myasthenia gravis after about 4 weeks of methimazole treatment. I admitted the cat earlier today and had no idea why it was so weak -- blood work was unremarkable and only minimal heart disease. Tonight I had a eureka moment as I went through a textbook and saw a one-liner about methimazole causing myasthenia. I will withdraw the cat from the medication and see how he progresses. I'm not sure if the owners will elect for alternative hyperthryoid therapy -- methimazole is the treatment I always use. How did your cat fare over the next few months, Pru?
I make a homemade diet and research the holistic route for Methylcobamamin or Vitamin B12.
the safest brand for cats is by Thorne Research #12 veggie capsules, its the purest form and has no additives that are unsafe for cats, ie: soy, yeast and flavorings.
the recommended dosage I have found is 1/4 capsule for 1 lb of food, which breaks down to 1/16 per 4oz feeding. you would need a 1/8 of a teaspoon measurement and fill only 1/2 full.
I haven't heard of myasthenia gravis, but again follow your Vet's recommendations.
I do hope kitties recover quickly.
Was there ever a response to this? My 14 year old cat was diagnosed with hyperthyroid, put on methimazole for about 2 months, and is now being tested for myasthenia gravis. I quit the methimazole over a week ago, but symptoms have not improved. I have other cats, so the YD diet won't work because he just goes to eat their food, and I just don't think the radiation treatment is smart in a cat his age, not to mention I do not have the money for it. But I'd really like some hope for improvement in his ability to eat and clean himself.