Cat Thyroid Medication Diarrhea. She does not use the litterbox when this happens and likes to hide it in the basement. Cats with hyperthyroidism, or too much thyroid hormone, usually have a benign tumor on their thyroid glands, located in the neck.
Although this is more common in those with hyperthyroid conditions due to the elevated thyroid hormone levels, some people with hypothyroidism and hashimoto's experience diarrhea as well. Cbc and t4 levels need to be rechecked regularly for the remainder of the cat’s life. If yes, you should consult a vet to find the right thyroid medication for cats.
You have other treatment options.
Your cat is vomiting, lethargic, depressed, in pain, or has any other worrisome symptoms. My cat is a 14 year old female and was diagnosed with hyperthyroidism a few months ago. Most side effects are mild and eventually resolve, although some necessitate discontinuation of the medication. I seem to remember there is a way to cure it completely by some kind of radiation treatment?