Eating isosorbide mononitrate headache, if the pain is mild and tolerable, you can continue to use the drug; if the pain is severe, you need to reduce the dosage under the guidance of a doctor or replace other drugs. Isosorbide mononitrate is a vasodilator, the use of drugs at the beginning of some patients will appear vasodilatory headache, generally speaking, the degree of pain is relatively mild, most patients can tolerate, this situation usually do not need to stop taking the drug, take a few days after the headache will disappear. If the headache is very severe or getting worse, you need to follow the doctor’s instructions to reduce the dosage or stop using the drug. Isosorbide mononitrate is mainly used for the prevention of angina pectoris, the treatment of persistent angina pectoris after myocardial infarction, and the treatment of chronic congestive heart failure in combination with diuretics and digitalis. This drug may also cause drowsiness, dizziness, upright hypotension and other adverse reactions. This drug is contraindicated in patients with hypersensitivity to the components or excipients of this drug, as well as in the presence of acute circulatory disorders, severe hypotension, acute myocardial infarction with low filling pressures, hypertrophic infarctive cardiomyopathy, constrictive pericarditis or pericardial tamponade, severe anemia, glaucoma, increased intracranial pressure. It should be used with caution in pregnant and lactating women and is not recommended for children. Isosorbide mononitrate should not be used indiscriminately, and must be strictly in accordance with medical advice.