Felanorm (methimazole) Oral Solution (5mg/ml)

Methimazole (also sold as Felimazole and frequently dispensed as a compounded oral liquid or transdermal gel) is the most widely prescribed medication for feline hyperthyroidism. It works by blocking the enzyme thyroid peroxidase, slowing the thyroid gland's overproduction of T4 and T3 and bringing your cat's thyroid levels back into the normal range. Hyperthyroidism is one of the most common endocrine diseases in cats over 10 years old, and methimazole is often the first-line treatment chosen by owners because it is non-invasive, reversible, and dosable from home. What methimazole is used for Veterinarians prescribe methimazole for cats showing classic hyperthyroid signs: weight loss despite a ravenous appetite, increased thirst and urination, restlessness or vocalization, an unkempt coat, and intermittent vomiting or diarrhea. Diagnosis is confirmed by elevated total T4 (sometimes free T4) on bloodwork. Methimazole controls the disease but does not cure it — definitive treatment options include radioactive iodine (I-131) therapy or surgical thyroidectomy, and your veterinarian can help you decide which is right for your cat. Important considerations Methimazole is given orally (tablet or compounded liquid) or applied to the inner pinna of the ear as a compounded transdermal gel — useful for cats who resist pills. Recheck bloodwork (T4, BUN, creatinine, CBC) is recommended 2–4 weeks after starting and after each dose change because controlling hyperthyroidism can unmask underlying kidney disease. Possible side effects include vomiting, anorexia, lethargy, facial pruritus (especially in the first month), and rarely, blood-cell changes or liver effects — call your veterinarian immediately if you notice any of these. Pregnant women should wear gloves when handling the tablets or transdermal gel. Smarty Vets dispenses both Felimazole brand tablets and pharmacy-compounded liquid and transdermal formulations from a licensed compounding pharmacy. Click Buy on VetCove to order with verified prescription.