NCIt definition : The hydrochloride salt form of methyldopa, a phenylalanine derivate and aromatic amino
acid decarboxylase inhibitor with antihypertensive activity. Methyldopa is a prodrug
and is metabolized in the central nervous system. The antihypertensive action of methyldopa
seems to be attributable to its conversion into alpha-methylnorepinephrine, which
is a potent alpha-2 adrenergic agonist that binds to and stimulates potent central
inhibitory alpha-2 adrenergic receptors. This results in a decrease in sympathetic
outflow and decreased blood pressure.;