The effects of isosorbide mononitrate tablets include the prevention of angina pectoris, the treatment of coronary heart disease and persistent angina pectoris after myocardial infarction, as well as the combined use of drugs in the treatment of chronic congestive heart failure. Isosorbide mononitrate tablets have the effect of relaxing the smooth muscle of blood vessels and are suitable for the prevention of angina pectoris, the treatment of persistent angina pectoris after myocardial infarction, the long-term treatment of coronary heart disease, and the treatment of chronic congestive heart failure with the combined application of diuretics and/or digitalis. Contraindications include hypersensitivity to the product, acute circulatory failure, cardiogenic shock, severe hypotension, hypertrophic cardiomyopathy, constrictive pericarditis, pericardial occlusion, increased intracranial pressure, severe anemia, patients with glaucoma, and the use of sildenafil is prohibited during treatment. Headache is a common adverse reaction, usually in the process of continuous use of headache symptoms will gradually disappear. Specific use of the drug should be under the guidance of a specialist.