Xinkang, or isosorbide mononitrate, may be more susceptible to drug resistance problems than the regular tablets. The main ingredient of ordinary tablets and extended-release tablets is isosorbide mononitrate, which is mainly used for the long-term treatment of coronary heart disease, the prevention of vasospastic and mixed coronary heart disease, and can also be used for the treatment after myocardial infarction and the treatment of chronic heart failure. The main difference between Isosorbide Mononitrate Extended Release Tablets and Isosorbide Mononitrate Regular Tablets is that Isosorbide Mononitrate Regular Tablets have a faster onset of action, shorter duration of action, and can also be contained for treatment, with rapid symptomatic relief, whereas Isosorbide Mononitrate Extended Release Tablets have a longer duration of action, and can be taken over a long period of time. Isosorbide mononitrate regular tablets are prone to drug resistance, so clinical treatment can be intermittent therapy, you can choose an intermittent period of not taking nitrate drugs. In the patient did not occur angina symptoms, you can not take oral, and then choose to take when angina symptoms occur. Patients taking oral isosorbide mononitrate are advised to consult the cardiovascular department of a regular hospital.