Nicorandil tablets are anti-anginal drugs, because of its special pharmacological effects (inhibit coronary artery spasm, improve microcirculation) at present there is no medicine can be completely replaced. 1. Nicorandil is an ATP-sensitive potassium channel opener, which can dilate coronary arteries, increase coronary blood flow, and also inhibit coronary artery spasm and improve microcirculation. Adverse effects of Nicorandil include dizziness, palpitations, etc. It is contraindicated in those who are allergic to this drug. 2. Other anti-anginal drugs (such as isosorbide mononitrate, etc.), although it can also dilate the coronary arteries, increase coronary blood flow, but no inhibition of coronary artery spasm, improve microcirculation. There is no substitute drug. Nicorandil is clinically used in anti-anginal treatment, there is no other kind of drug can completely replace, such as the need to change the drug, need to be under the guidance of a doctor to use the correct medication, do not adjust their own treatment program.