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  • What is hyperthyroidism
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Disclaimer

This site is provided as an information service for owners of cats who have been prescribed Felimazole by their vet. Felimazole is a prescription-only medicine, available only from your veterinary surgeon. Any questions about your cat should be directed to your veterinary practice. Felimazole is a registered trademark of Dechra Limited.

Frequently asked questions

Here are some of the most frequent queries we answer about your cat’s condition:

Signs and Symptoms

What are the signs of hyperthyroidism?

The most common symptoms of hyperthyroidism are losing weight even though your cat might be hungrier and eating more.

You might also notice:

  • Increased fluid intake
  • Frequent urination
  • Increased restlessness and irritability
  • Anxious facial expression
  • Occasional vomiting
  • Diarrhoea
  • An unkempt coat
How is hyperthyroidism diagnosed?

To confirm the diagnosis your veterinary surgeon will arrange a blood test in order to measure levels of the T4 hormone.​

Treatment

What is Felimazole and how does it work?

Felimazole contains the anti-thyroid drug thiamazole, which reduces the production of T4 and T3 within the thyroid gland.​

How do I give Felimazole to my cat?

Follow the instructions given by your veterinary surgeon. Felimazole tablets are best given directly to your cat, but the small, sugar-coated tablets can also be hidden whole in the food.​

What should I do if I forget to give a tablet?

Speak to your veterinary surgeon. DO NOT give a double dose next time. If your cat is due to have a monitoring blood test within a couple of days of missing a tablet, MAKE SURE YOU LET YOUR VETERINARY SURGEON KNOW as it could affect the blood results.​

How long will my cat require treatment?

To maintain normal T4 and T3 concentrations in the blood your cat will need to be dosed with Felimazole every day for the rest of their life.​

Will I need to revisit my veterinary surgeon?

Yes. It is important that your cat revisits your veterinary surgeon for assessment and monitoring tests. These are recommended at 3, 6, 10 and 20 weeks after starting treatment and thereafter every 3 months.​

Does Felimazole have any side-effects?

Side-effects most commonly occur within the first 3 months of therapy. They are generally mild and include inappetence, vomiting and lethargy. More serious side-effects are possible so if your cat becomes unwell at any time while on Felimazole therapy, stop treatment and consult your veterinary surgeon as soon as possible.​

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This site is provided as an information service for veterinary professionals and the owners of cats who have been prescribed Felimazole by their vet. Felimazole is a prescription-only medicine, available only from your veterinary surgeon. Any questions about your cat should be directed to your veterinary practice. Felimazole is a registered trademark of Dechra Limited.

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