Isosorbide mononitrate extended-release capsule, can treat myocardial ischemia caused by coronary atherosclerosis, also can be used as angina prophylaxis. Take 50mg once/day with meals. It can dilate blood vessels, and the headache or facial flushing caused by vasodilatation may occur at the beginning of the drug, which is normal and can be continued and will gradually disappear in a week or so, but for patients with severe headache, long-term use is not recommended. If there is a significant decrease in blood pressure, the amount can be appropriately reduced to observe blood pressure at any time, through the role of vasodilatation, if the systolic blood pressure is lower than 90mmHg, to the lower limit of normal systolic blood pressure to prohibit the use. Compared with the ordinary isosorbide nitrate tablets, the effect of isosorbide mononitrate extended-release capsules can last for more than 20h and can prevent myocardial ischemia that occurs during sleep, taking this product should not be stopped suddenly, otherwise rebound myocardial ischemia will be aggravated.