Felanorm®
(methimazole) Oral Solution 5 mg/mL
The easy-to-give solution for treating feline hyperthyroidism
No pill. No gel. No worries! Felanorm® (methimazole) Oral Solution 5 mg/mL for cats is an FDA-approved, easy-to-administer treatment for feline hyperthyroidism.
Target Species: Cats
A small pill to you can be a big deal to her.
Make twice-daily pills a thing of the past with the new easy-to-give form of methimazole for cats.
Ask your vet about Felanorm
Easy to Give. Easy to Trust.
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The first FDA-approved oral solution for feline hyperthyroidism
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Syringe marked in 0.25 mg increments for accurate dose titration
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Proven track record (over 100 million doses sold in the U.K.)1
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Easy-To-Give (International Society of Feline Medicine awarded)2
REFERENCES:
1 Kynetec Sales Data, U.K. (based on standard 2.5 mg dose).
2 International Society of Feline Medicine Easy-To-Give award 2017 (NOTE: Thyronorm® is the U.K. brand name for Felanorm; both share the exact same formulation).
IMPORTANT SAFETY INFORMATION:
CAUTION: As with all drugs, side effects may occur. The most commonly reported side effects are anorexia, vomiting, head/facial pruritus or edema, depression/lethargy, weight loss, anemia, elevated liver enzymes, skin lesions, elevated BUN, diarrhea, and thrombocytopenia. Felanorm® Oral Solution is not for use in pregnant or lactating queens, or cats with renal, hepactic, or hematological disorders. In some reported cases, the patients recovered after adverse signs were recognized, the drug was withdrawn, and veterinary care was applied. In some cases, death (or euthanasia) has been reported as an outcome of the adverse reactions listed above. Methimazole has anti-vitamin K activity and may induce bleeding diathesis without evidence of thrombocytopenia. Refer to the prescribing information for complete details.
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Active Ingredient(s)
Methimazole is a thioureylene antithyroid drug, which inhibits the synthesis of thyroid hormones. Methimazole (1-methylimidazole-2-thiol) is a white crystalline substance that is freely soluble in water. The chemical formula is C4H6N2S. Molecular weight is 114.16.
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Dosage Form and Description
Felanorm is available at 5 mg/mL in bottles containing 30 or 100 mL with 1 mL dosing syringe.
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Indications
Felanorm (methimazole) is indicated for the treatment of hyperthyroidism in cats
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Dosage and Administration
Always include the Instructions for Preparing a Dose of Felanorm (methimazole) Oral Solution and the Information for Cat Owners with a prescription. The starting dose of Felanorm is 2.5 mg administered every 12 hours. Following 3 weeks of treatment, the dose should be titrated to effect based on individual serum total T4 (TT4) levels and clinical response. Dose adjustments should be made in 2.5 mg increments. The maximum total dosage is 20 mg per day divided, not to exceed 10 mg as a single administration. Hematology, biochemistry, and TT4 should be evaluated prior to initiating treatment and monitored after 3 weeks and 6 weeks of treatment. Thereafter, bloodwork should be monitored every 3 months and the dose adjusted as necessary. Cats receiving doses greater than 10 mg per day should be monitored more frequently. The product should be administered orally using the enclosed graduated dosing syringe. The syringe has measurements representing the mg dose of the product. Rinse/clean the oral dosing syringe between uses. (See the Instructions for Preparing a Dose of Felanorm (methimazole) Oral Solution).
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Storage
Store at controlled room temperature 25°C (77°F) with excursions between 15°-30°C (59°-86°F) permitted. Keep the container tightly closed.
How to Give Felanorm®
Here's a quick guide on how to safely administer Felanorm (methimazole) Oral Solution.
© 2025 Norbrook Laboratories Limited. The Norbrook logo, Felanorm and Thyronorm are registered trademarks of Norbrook Laboratories Limited. 771-25-099
US Patent Numbers: 10,045,967, US 11,123,317 and US 11,738,005
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Find out if Felanorm is right for your cat.
