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Felimazole Tablet Rx

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Product Overview

How To Use

What’s in it?



Questions & Answers

Product Description

Felimazole Tablets are coated, FDA-approved tablets that treat feline hyperthyroidism. It uses methimazole, an antithyroid medication that reduces T3 and T4 production in the thyroid gland.

Who is Felimazole Tablet for?

For use in cats.

Why use Felimazole Tablet?

Felimazole is the first treatment approved by the FDA to treat feline hyperthyroidism.

How does Felimazole Tablet work?

Felimazole uses methimazole to inhibit thyroid hormone synthesis, effectively treating conditions of hyperthyroidism.


Dechra Pharmaceuticals

Active ingredient(s):


How is Felimazole Tablet sold?

Sold by the tablet in 2.5 mg or 5 mg strengths

What are the side effects of Felimazole Tablet?

Withdraw use and seek immediate veterinary attention if any of these severe signs of an allergic reaction occur:
  • Hives
  • Swelling of face, tongue, or lips
  • Difficulty breathing
Withdraw use and immediately speak to your veterinarian if your pet has any of the following severe adverse reactions:
  • Jaundice
  • Dark urine
  • Loss of appetite
  • Low fever
  • Nausea
  • Skin rash
  • Peeling
  • Severe blistering
  • Blood in stool or urine
  • Unusual weakness
  • Easy bleeding or bruising
  • Body aches
  • Chills
  • Fever
Less severe reactions could occur. In these cases, continue to administer this medication and speak with your veterinarian:
  • Hair loss
  • Swelling
  • Nerve pain
  • Joint pain
  • Muscle pain
  • Itching
  • Vomiting
  • Mild nausea
  • Dizziness
  • Drowsiness
Other reactions could occur. If you observe any signs of bothersome or unusual effects, speak with your veterinarian.

What special precautions are there?

Nursing or pregnant women or women who could become pregnant should take care to use gloves when handling these tablets, or the bodily fluid or litter of any treated cat.

What to do if overdose?

Contact your closest emergency animal hospital.

How can I store Felimazole Tablet?

Store in a dry and cool environment.

Helpful Tips:

Pharmacists are standing by to offer Pet Parent counseling regarding prescription medication purchased from Allivet before and after dispensing. Pharmacists on duty are available Monday-Friday, 9:30AM - 5:30PM EST and will be on call Saturday 12:00PM - 4:00PM EST for consultation.


Use as directed by your veterinarian

Main Ingredients


Find out if your cat has hyperthyroidism. Click hyperthyroidism in cats

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Felimazole Tablet

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feline medication

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