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Isosorbide and isosorbide dinitrate are related compounds, but they differ in their chemical structure and use. Isosorbide is a general term that can refer to a class of compounds, while isosorbide dinitrate is a specific medication used primarily to prevent and treat angina pectoris (chest pain). Isosorbide dinitrate works by relaxing and widening blood vessels, which helps to improve blood flow and reduce the heart's workload.

Isosorbide dinitrate is used primarily to prevent and treat angina pectoris, which is chest pain resulting from coronary artery disease. It works by relaxing and widening blood vessels, allowing blood to flow more easily to the heart. This helps reduce the heart's workload and alleviates chest pain.

Isosorbide should not be taken if the patient has a known allergy to it or any of its components. It should also be avoided in individuals with certain conditions such as severe anemia, increased intracranial pressure, or those who are taking phosphodiesterase inhibitors like sildenafil, tadalafil, or vardenafil, as this combination can lead to severe hypotension. Additionally, it should not be used in cases of acute myocardial infarction with low filling pressures or in patients with a history of hypersensitivity to nitrates. It is important to consult a healthcare provider for a comprehensive evaluation before starting isosorbide.

Doctors prescribe isosorbide primarily to prevent chest pain (angina) in patients with certain heart conditions. It works by relaxing and widening blood vessels, which helps to improve blood flow to the heart and reduce its workload. This can help prevent episodes of angina and improve the patient's ability to exercise and perform daily activities.

Isosorbide is not primarily used as a blood pressure medication. It is mainly prescribed to prevent chest pain (angina) in patients with certain heart conditions. It works by relaxing and widening blood vessels, which can also have the effect of lowering blood pressure, but its primary use is not for treating hypertension.