Used primarily in acute hypertensive emergencies, Fenoldopam Hydrobromide acts as a rapid-acting vasodilator by selectively activating dopamine D1 receptors. This leads to relaxation of vascular smooth muscle, particularly in renal, coronary, and cerebral arteries, resulting in reduced blood pressure. It is especially beneficial in patients with hypertension accompanied by renal impairment, as it increases renal blood flow and promotes natriuresis without reducing glomerular filtration rate. Administered intravenously, it allows for precise control of blood pressure in critical care settings. Its short half-life enables quick titration and minimizes prolonged hypotensive effects, making it suitable for perioperative hypertension management.