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Thyronorm New Case Flyer
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Thyronorm is the UK & Ireland market-leading*, palatable liquid treatment for feline hyperthyroidism. Awarded the “Easy to Give” status, it improves owner compliance and dosing accuracy.
Thyronorm is a honey-flavoured oral solution that is highly acceptable¹ to cats and provides clinicians with dosing flexibility, through precise dose titration and the option for once-daily administration, ultimately supporting long-term compliance for feline hyperthyroidism.
Available in Great Britain, Northern Ireland & The Republic of Ireland.
Contact support teams with any question by phone or via our quick form.
Available in 30 ml and 100 ml bottles, supplied with a dosing syringe.
For the stabilisation and long-term medical management of feline hyperthyroidism.
Thiamazole inhibits the action of the enzyme thyroid peroxidase, preventing the production of active thyroid hormones T3 and T4. Thyronorm Oral Solution has proven in-vivo bioequivalence to thiamazole/methimazole containing tablets. Medical management with thiamazole offers a response rate of >95% while on medication, without the risk of permanent hypothyroidism.
Thiamazole (also known as methimazole) 5 mg/ml
The starting dose is 5mg of thiamazole per day, divided into two and administered morning and evening. Adjust the daily dose in increments of 1.25 mg to 2.5 mg to aim for a total T4 in the lower half of the reference range. At doses above 10 mg, monitoring should be increased. The dose should not exceed 20 mg per day (off-licence)
It is possible to give a once daily dose of 5mg if required to support compliance but a 2.5mg dose given twice daily may be more efficacious in the short term. In order to enhance stabilisation of the hyperthyroid patient the same dosing schedule relative to feeding should be used daily.²
Monitoring
Haematology, biochemistry and serum total tT4. Testing should be assessed before initiating treatment and at 3 weeks, 6 weeks, 10 weeks, 20 weeks, and thereafter every 3 months.
Thiamazole is a suspected human teratogen. Pregnant women should not handle anti-thyroid medications. If the client is of childbearing age, non-permeable gloves should be worn when administering treatment and cleaning cat litter or vomit. Avoid dermal and oral exposure, including hand-to-mouth contact. Do not eat, drink or smoke while handling the product or used litter. Wash hands after treatment. Following administration of the product, wipe any residual veterinary medicinal product remaining on the tip of the dosing syringe with a tissue. The contaminated tissue should be immediately disposed of. The used syringe should be stored with the product in the original carton. The product has a 6-month in-use shelf-life.
Can I give Thyronorm in food or do I have to dose by mouth?
Giving Thyronorm with food constitutes an off-licence use. Administration with food can alter the bioavailability of thiamazole so the key is to be consistent! From a client safety perspective, ensure anyone handling the medicated food or washing the cat’s dishes takes appropriate care (see Safety, precautions and storage).
Can I use Thyronorm SID or does it need to be BID?
Thyronorm is licensed for both once and twice daily dosing to aid with compliance. The latter is considered more efficacious in the short-term stabilisation of the patients.
Should a cat with a high T4 have a higher dose of Thyronorm?
Not necessarily. The amount of thyroid hormone blocked is not dose dependent. A cat with high tT4 will not necessarily need a higher treatment dose initially so it is recommended to begin with the licensed 5 mg daily dose.
What time of day should you take a monitoring T4 blood test?
Any time. The timing relative to the dose is generally not clinically relevant. The drug is actively concentrated within the thyroid gland meaning the effects last the full 24 hours, allowing this flexibility.
Your client is a female of childbearing age, what advice should you give when dispensing Thyronorm?
If possible, ask another person to medicate the cat and handle litter/vomit, or to wear non-permeable single-use gloves when handling the medication and the cat's litter or vomit. If they are pregnant or attempting to conceive, they should not medicate the cat or handle the litter/vomit.
Last monitoring blood test showed a T4 of 30, a month later the T4 is 90 at the same dose... What should you do?
First, double check that compliance of administering the medication has been consistent. Although thiamazole concentrates in the thyroid gland, circulating total T4 will rapidly rebound (within 72 hours) after treatment curtailment. Second, consider disease progression or other underlying factors. If concerned about a suspected lack of efficacy, please contact your local Virbac Territory Manager.*Kynetec VetTrak Sales Data, May 2026
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