NCIt definition : A methylated tyrosine, a catecholamine synthesis antagonist with antihypertensive
property. Metyrosine competitively inhibits tyrosine 3-monooxygenase, an enzyme that
activates molecular oxygen to catalyze the hydroxylation of tyrosine to dihydroxyphenylalanine
(Dopa), an intermediate to catecholamine (dopamine, norepinephrine, and epinephrine)
production. This agent reduces the elevated levels of catecholamines associated with
pheochromocytoma, thereby preventing hypertension.;