Nicorandil generally refers to Nicorandil tablets, Nicorandil tablets are generally used to dilate coronary arteries, adverse effects will generally have symptoms of general discomfort, precautions are allergic to the drug and liver and kidney disease patients can not be used. 1. Role: Nicorandil tablets is a nitrate drug, its pharmacological effect is mainly to dilate coronary arteries, increase coronary artery blood flow, inhibit intracellular calcium efflux, relieve coronary artery spasm, significantly reduce coronary artery vascular resistance, there is no obvious negative effect of variable force, does not affect the heart rate. 2. Adverse reactions: the adverse reactions of the drug are mainly headache, nausea, vomiting, dizziness, fatigue and fever. In severe cases, there may be hepatic insufficiency, thrombocytopenia, mouth ulcers and allergic reactions. 3.Precautions: It should not be used by people who are allergic to the ingredients of the drug, patients with glaucoma and those suffering from severe liver and kidney diseases. Because the drug is metabolized by the liver and kidneys, it cannot be used. It is recommended to consult a doctor in time for relevant examination, and according to the specific situation, carry out symptomatic treatment under the guidance of the doctor.