The main vasodilator drugs are sodium nitroprusside, nitrates, ɑ receptor antagonists, and human recombinant brain natriuretic peptide. 1. Sodium nitroprusside: It can dilate the blood vessels of veins and arteries, and the drug takes effect in about 2 to 5 minutes, and the blood pressure rises slowly. However, it should not be used for more than 24 hours if administered intravenously. Common unresponses include palpitations, dizziness and headache, palpitations, allergic reactions and so on. 2. Nitrates: common drugs are nitroglycerin, isosorbide dinitrate, the main effect is to dilate the small veins, reduce the volume of return blood, so that the pulmonary vascular pressure is reduced. Patients with pericardial tamponade and anemia are prohibited from using them. 3.ɑ receptor antagonist: common drugs are uradil, mainly to dilate the arteries of the veins, the effect of dilation of veins is greater than the dilation of arteries. It is prohibited for use in lactating women. 4. Human recombinant brain natriuretic peptide: common drugs include nesiritide, which dilates the veins of arteries and has the effect of sodium excretion and diuresis. Patients with heart valve disease are prohibited from using it. The above drugs need to be used under the guidance of a professional doctor, do not self-medication.