Methimazole (Generic) Tablets for Cats, slide 1 of 1

Methimazole (Generic) Tablets for Cats

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Strength: 5-mg
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Count: 1 tablet

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Methimazole is an oral medication prescribed by vets to help treat cats who suffer from an overactive thyroid gland. This medication is formulated to help control your cat's hyperthyroidism and helps relieve symptoms, such as vomiting and weight loss. Plus, it comes in an oral tablet form, so it can be disguised in your cat’s favorite food. Customers may receive this drug under the names Tapazole, Felimazole.


Methimazole Tablets are indicated for the treatment of hyperthyroidism in cats.

Possible Side Effects

Side effects usually occur during the first three months of treatment. They may include loss of appetite, vomiting, and lethargy. These typically occur within the first two weeks of treatment and may eventually stop even with continuation of treatment. Less common side effects are yellowing of the gums, skin, or eyes (jaundice) which may signify liver problems. Itching of the face, scratching, or increased bleeding tendencies may occur.

Drug & Food Interactions

Do not use in cats with hypersensitivity to methimazole, carbimazole or the excipient, polyethylene glycol. Do not use in cats with primary liver disease, renal failure, autoimmune diseases, hematological disorders or coagulopathies.


Use of Methimazole Tablets in cats with renal dysfunction should be carefully evaluated. Reversal of hyperthyroidism may be associated with decreased filtration rate and a decline in renal function, revealing underlying renal disease.

NOTE: For Generic Medications, picture displayed may not depict actual product. Generic medications may vary from one order to the next by size, color and shape depending on manufacturer.

  1. Prescribing Information

See all items by Methimazole

  • Item Number
  • Generic Name
  • Common Brand Name(s)
    Tapazole, Felimazole
  • For Use With
  • Administration Form
  • Product Form
  • Health Condition
  • Drug Type


Recommended Dosage

Use this medication as directed by your veterinarian.

Storage Instructions

Store at controlled room temperatures of 68° - 77°F. Protect from moisture. .


What is Methimazole?

A tablet that is given primarily to cats in order to control hyperthyroidism (overactive thyroid gland). It is given orally (by mouth) as directed by your veterinarian. This medication is not a cure for the disease. It will, however, help to control the condition which should help minimize your cats symptoms.

What results can I expect?

Methimazole should help to decrease your hyperthyroid cats level of thyroid hormone. This should help to reduce your cats hyperthyroid symptoms including vomiting and weight loss. This should help your cat to feel better. It can take 1-4 weeks to see a decrease in the level of thyroid hormone produced by the body. This medication does not cure hyperthyroidism but it should help to control the condition and minimize symptoms. This medication usually needs to be given for your cat's lifetime in order to optimally control the disease.

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