Nifedipine is a calcium channel blocker that inhibits the inward flow of extracellular calcium ions. Nifedipine can reduce intracellular calcium concentration, which can lower myocardial oxygen consumption, slow down atrial cardiac conduction, and slow down heart rate. In terms of blood vessels, it can dilate arterial smooth muscle and lower peripheral resistance. It is also effective in preventing and treating coronary heart disease and angina pectoris, which are caused by insufficient blood supply to the myocardium, and nifedipine can dilate coronary arteries, increase blood supply to the myocardium, and improve myocardial ischemia. It is also effective in preventing hypertension because nifedipine can dilate peripheral blood vessels, and blood pressure naturally decreases when blood vessel diameter expands. Nifedipine can also effectively reduce afterload without serious adverse effects on other systems, in short, the main effects of nifedipine are produced by dilating blood vessels.