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Felimazole (methimazole) Rx

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Felimazole (methimazole) Coated Tablets for Cats

If your cat has an overactive thyroid gland, your veterinarian may prescribe FDA-veterinary approved Felimazole to help stabilize your cat’s condition. While Felimazole can’t stop the condition, it will help your cat feel better and improve her quality of life

  • Manages symptoms of hyperthyroidism in cats
  • FDA approved
  • Small, coated tablets for easy dosing

Hyperthyroidism, or overactive thyroid, in cats causes weight loss, increased appetite, excessive thirst, hair loss, and more. While there is no permanent treatment for hyperthyroidism, your veterinarian can help your cat feel better by regulating the thyroid with prescription Felimazole. The active ingredient in each small, coated pill is methimazole, which reduces the amount of the thyroid hormone your cat’s thyroid gland produces.  The result is a healthier cat and a better quality of life. 


What you should know about Felimazole

  • Talk to your veterinarian before using this product.
  • Wash your hands with soap and water after giving 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.
Coated Tablet Pictures:

Felimazole: Methimazole for Cats - 2.5 Tablets Picture               Felimazole: Methimazole for Cats - 5mg Tablets Picture

Felimazole 2.5mg Tablet Picture                                Felimazole 5mg Tablet Picture

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

You can find a Client Information Sheet which provides a summary of information about Felimazole (methimazole) by following the link below:

Felimazole Client Information Sheet*


If you have questions or concerns about Felimazole, or conditions related to its use, contact your pet's veterinarian or pharmacist.


*This link opens in a new window.

You can find a package insert which provides more detailed information on Felimazole (methimazole) Tablets's ndications, forms of administration, and side effects, along with other clinical information, by following the link below:

Felimazole Package Insert*


Felimazole' package insert does not take the place of instructions from your veterinarian. Talk to your veterinarian if you do not understand the information provided in this document or if you have any questions about Felimazole (methimazole) tablet for the treatment of hyperthyroidism in cats.


*This link opens in a new window.