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The usual total daily dose is 200 mg to 400 mg in two divided doses. Some patients may require doses up to 800 mg per day which is the maximum dose. It is recommended that therapy be initiated at a low dose, followed by titration to an effective dose.
In a 2 year study, rats were given Methimazole at doses of 0.5, 3, and 18 mg/kg/day. These doses were 0.3, 2, and 12 times the 15 mg/day maximum human maintenance dose (when calculated on the basis of surface area). Thyroid hyperplasia, adenoma, and carcinoma developed in rats at the two higher doses.