NCIt definition : The dinitrate salt form of isosorbide, an organic nitrate with vasodilator activity.
Isosorbide dinitrate relaxes vascular smooth muscle by formation of the free radical
nitric oxide (NO), which is identical to the endothelium-derived relaxing factor (EDRF).
NO activates guanylyl cyclase, thereby increasing the synthesis of cGMP within smooth
muscle, resulting in dephosphorylation of light chain myosin and relaxation of peripheral
arteries and veins. In addition, isosorbide dinitrate relaxes coronary arteries, thereby
increasing the blood circulation through the ischemic area. (NCI05);