The difference between isosorbide mononitrate tablets and dispersible tablets is the different dosage forms, time of action and duration of efficacy. Isosorbide mononitrate tablets belong to the ordinary tablets, dispersible tablets is a special technology, dispersible tablets than ordinary tablets decomposition is faster, the absorption and utilization of the drug is higher, can quickly play the role of vasodilation. Isosorbide mononitrate dispersible tablets due to faster absorption, metabolism is also faster, in the body lasts for a shorter time, pass to take 2-3 times a day, while the ordinary tablets absorption is relatively slow, the duration of the drug effect is relatively long, take 1 time a day. Isosorbide mononitrate has the role of vasodilatation, clinically, it is mainly used for the treatment of coronary heart disease, the adverse effects of the drug are headache, headache, dizziness, tachycardia, low blood pressure, etc. Allergy to the components of the drug, glaucoma, increased intracranial pressure, low blood pressure, etc., is contraindicated in patients. Patients with coronary heart disease should choose the appropriate dosage form under the guidance of a physician and avoid purchasing the drug on their own.