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Description & Usage

Methimazole is an anti-thyroid pill used to treat hyperthyroidism in cats to restore the hormone levels back to normal and prevent vomitting and weight loss. It is also used before thyroid surgery or radioactive iodine treatment. 

Precautions & Side Effects

Blood tests must be done to check for the dosage. Please talk to your veterinarian if your pet is pregnant or nursing animals. Periodic blood tests are a mandate while the cat is taking this medication. Side effects may include vomitting, loss of appetite and lethargy. These symptoms usually subside after a few weeks. Yellowing of the skin or eyes (jaundice) may happen in rare cases. Do not use in cats who are allergic to methimazole, carbimazole or the excipient, polyethylene glycol. Do not use in cats with liver disease, renal failure, autoimmune diseases, hematological disorders or coagulopathies.



Follow the dosage prescribed by your veterinarian. Methimazole tablets are administered orally with or without food.


Store at controlled room temperature between 68° - 77°F away from moisture and heat. Keep away from pets and children.

What is Methimazole Tablets for Cats?

Methimazole, more commonly known as Tapzaole or Felimazole is a presciption medication used to control cat's overactive thyroid gland (Hyperthyroidism) by decreasing the level of thyroid hormone. 

How long does it take to see results?

Methimazole can take up to 4 weeks before your cat's thyroid hormone decreases. The medicine will help reduce symptoms such as vomitting and weight loss.