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Tapazole (methimazole) Rx

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If your cat suffers from hyperthyroidism your veterinarian may prescribe Tapazole. This medication helps regulate the amount of thyroid hormone produced by the thyroid gland so your cat can enjoy a better quality of life.


  • Treats hyperthyroidism in cats
  • Fast acting
  • Few side effects


Hyperthyroidism is a condition that causes your cat’s thyroid gland to produce more hormone than needed. The result is a range of symptoms from hair loss and weight gain to lethargy and constipation. By controlling your cat’s thyroid hormone production you can help him lead a happier, healthier life. Talk to your veterinarian about Tapazole, a medication that inhibits the production of the thyroid hormone. This prescription medication can be used long term and has no reported side effects.


What you should know about Tapazole:

  • Talk to your veterinarian before using this product.
  • Follow dosing directions exactly - don’t give your pet more medication than directed and don’t skip doses.
  • Read the label carefully for information about storage, possible side effects, and drug interactions.


For additional information about Tapazole, click the “More Information” and “Package Insert” tabs above. 

You can find a Client Information Sheet which provides a summary of information about Tapazole(Methimazole) Tablets for Cats by following the link below:


Methimazole Client Information Sheet*


If you have questions or concerns about Tapazole(Methimazole) Tablets, or conditions related to its use, contact your pet's veterinarian or pharmacist.


*This link opens in a new window.

You can find a human-labeled package insert which provides more detailed information on Tapazole's indications, forms of administration, and side effects along with other clinical information by following the link below.

This information is written for product use in people, but may be helpful to you when giving Tapazole to your pet.

Tapazole is sold as a FDA approved generic drug. Brand varies from order to order and variation to variation. The provided link is directed to the brand available at the time of this publication. VetRxDirect is unable to guarantee which brand will be available at the time of order shipment.


Tapazole Package Insert


Tapazole's package insert does not take the place of instructions from your veterinarian. Talk to your pet's veterinarian or pharmacist if you do not understand the information provided in this document or if you have any questions about Tapazole for hyperthyroidism in cats.


*This link opens in a new window.


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1 Question | 1 Answer
Displaying question 1
  • Q:

    What is the usual dose using tapazole tablets for hyperthyroidism in a cat weighing about 9 lbs? I think my kitty is getting too high a dose? He also has stage 2 of kidney disease and is 15 yrs old.
    Asked on 10/30/2014 by Froshey the cat from Eugene, OR, United States

    1 answer

    • A:

      The dose of Tapazole tablets for hyperthyroidism in your pet must be determined by your pet’s veterinarian. The most common adverse effects associated with this medication include lethargy, depression, lack of appetite, and vomiting; especially during the start of therapy. This medication may also cause upset stomach in your pet which usually doesn’t last for an extended period of time. If any of these adverse effects or other concerning effects are occurring with your pet, we recommend following-up with your pet’s veterinarian. The veterinarian will be able to determine the most appropriate dose based upon an evaluation of the relief of your pet’s hyperthyroid symptoms, presence of any side-effects, and laboratory tests. Follow-ups when initiating or adjusting the dose of this medication are usually frequent for this reason.

      Thank you,

      Answered on 11/10/2014 by VetRxDirect from VetRxDirect
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