NCIt definition : The mesylate salt form of fenoldopam, a benzazepine derivative with rapid-acting vasodilator
activity. Fenoldopam mesylate is a racemic mixture of S- and R- isomers; the latter
is responsible for the biological activity and has a significantly higher affinity
for dopamine D1-like receptors (D1 and D5) as well as moderate affinity to alpha-2
adrenergic receptors. This agent selectively activates the dopamine D1-like receptor,
thereby causing vasodilatation and increasing renal perfusion.;