If you have symptoms of insufficient blood supply to the heart muscle, you can take nitroglycerin under the tongue. Nitroglycerin is an emergency medicine for coronary heart disease and should be carried with you. When you have symptoms of insufficient blood supply to the heart muscle or angina pectoris, you can take nitroglycerin sublingually, and the symptoms can be relieved in 2-3 minutes. When coronary heart disease is diagnosed, it is recommended to take long-term oral coronary heart disease secondary prevention drugs, commonly used drugs are aspirin, isosorbide mononitrate, metoprolol, simvastatin, enalapril, etc. The symptoms of angina often occur when emotional excitement, eating a full meal, of course, there are variant angina, not related to activity and emotional excitement, is caused by vasospasm, often related to sympathetic excitation, often in the early morning just after waking up, the attack lasts longer, usually more than half an hour, the application of calcium ion antagonist containing nifedipine, the efficacy of this situation may be better.