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Treatment options

It is very important that cats diagnosed with hyperthyroidism are treated as soon as possible. The longer a cat is left untreated the more detrimental the effects of the excessive thyroid hormones. Your vet will discuss your pet’s treatment plan with you and together you can decide on the best option for your cat.

The most common treatments options are:

Medical treatment

Medical treatment is used for long term management of hyperthyroid cats and prior to radioactive iodine treatment or surgery. Drugs that block the manufacture of the thyroid hormones are used to reduce the levels of these hormones back to normal.

Radioactive Iodine

Radioactive iodine treatment requires specialised facilities and hospitalisation. It is the most effective treatment in cases with malignant thyroid tumors. It can however result in hypothyroidism – which may require supplementation of thyroid hormones.


Surgical thyroidectomy involves the removal of one or both lobes of the thyroid gland. Cats usually undergo 2-4 weeks of medical treatment to improve their condition and minimise the potential complications, such as heart irregularities.


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