Hydralazine is a vasodilator. It relaxes (widens) veins and arteries, which makes it easier for your heart to pump. Isosorbide dinitrate is in a class of drugs called nitrates. Isosorbide dinitrate dilates (widens or relaxes) blood vessels (arteries and veins). When blood vessels are dilated, it is easier for the heart to pump. Also, more blood, which is rich in oxygen, can flow to the heart. Hydralazine and isosorbide dinitrate is used to treat heart failure. Hydralazine and isosorbide dinitrate may also be used for purposes other than those listed in this medication guide.
Bidil is a combination drug of hydralazine and Isosorbide dinitrate. Hydralazine serves as a vasodilator. The drug relaxes both arteries and veins in order to make it easy for the heart to work normally, in pumping the blood to the other parts of the body. The component, Isosorbide dinitrate acts on the blood vessels by dilating them. When dilation takes place, it becomes easy for the heart to perform its functions. This allows more blood rich in oxygen to freely flow to the heart. This medication is meant specifically for African-Americans suffering from heart disease.