NCIt definition : A bitartrate salt of norepinephrine, a synthetic phenylethylamine that mimics the
sympathomimetic actions of the endogenous norepinephrine. Norepinephrine bitartrate
acts directly on the alpha- and beta-adrenergic receptors. Clinically, norepinephrine
is used as a peripheral vasoconstrictor that causes constriction of arterial and venous
beds via its alpha-adrenergic action. It is also used as a potent inotropic and chronotropic
stimulator of the heart mediated through its beta-1 adrenergic action.;