Apresol Plus

Isosorbide dinitrate is an organic nitrate medication used to treat and prevent angina pectoris in patients with coronary heart disease.[1] It functions as a vasodilator by releasing nitric oxide, which activates guanylate cyclase in vascular smooth muscle cells, increasing cyclic guanosine monophosphate levels to induce relaxation of both arterial and venous vasculature, thereby decreasing cardiac preload and afterload.[1] Synthesized in 1940 and further developed in the United States during the 1950s, it provides longer-acting prophylaxis against angina compared to sublingual nitroglycerin but requires dose titration to mitigate common adverse effects such as headaches and the potential for nitrate tolerance with prolonged administration.[2][1] It is also employed in combination with hydralazine for heart failure management in specific populations, reflecting its role in reducing ventricular filling pressures without acutely elevating cardiac output.[1]