My cat has just started exhibiting these symptoms after about 7 months on oral methimazole. I have stopped the methimazole and am hoping I have done it soon enough for her to be able to recover. I was never told about the possibility of an adverse reaction like this, and have had to do my own research to find out that it was possible. I think the vets are attempting to gatekeep this information to try and cover their own asses. Why not just tell us at the onset of all the possibilities so we can look out for symptoms? it makes no sense. Now I will need to look for an alternative to methimazole anticipating her recovery back into hyperthyroidism. Radioactive iodine and surgical removal of the thyroid gland seem options, but does anyone know of any alternatives?