metyrosine

An inhibitor of tyrosine hydroxylase and therefore a powerful inhibitor of catecholamine synthesis; used for controlling the manifestations of pheochromocytoma, in preoperative preparation, or in instances where surgical resection is contraindicated or incomplete.

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me·ty·ro·sine (mə-tiґro-sēn) [USP] an inhibitor of tyrosine 3-monooxygenase, which catalyzes the first step in catecholamine synthesis, used to control hypertensive attacks in pheochromocytoma; administered orally.