Felimazole is a prescription medication used to treat hyperthyroidism in cats, and it works by inhibiting the synthesis of thyroid hormone so T3 and T4 hormone are not secreted as much by the gland. This is necessary to eliminate the risk of poor cardiovascular health for cats with untreated hyperthyroidism as well as relief of increased thirst, frequent urination, or any of the other cat hyperthyroidism symptoms that may result. Most pet owners can expect to see improvement within 3 weeks to 1 month of starting on Felimazole for cats, and this medication is the standard for cat hyperthyroidism. You can buy Felimazole with a prescription, and your best price on it will be when you order pet medication online from Canada Pharmacy.