According to the different mechanisms of action of hypertension drugs, there are five major classes of drugs:calcium antagonists, angiotensin-converting enzyme inhibitors, angiotensin receptor antagonists, diuretics, and beta-blockers. 1, diuretics: by promoting the production of urine, eliminating excess fluid in the blood, reducing the blood volume in the circulatory system and lowering blood pressure. Such as tachyphylaxis, dihydrochlorothiazide. 2, beta-blockers: this drug makes your heart beat slowly and contraction is reduced thus lowering blood pressure and improving blood flow. Such as metoprolol, bisoprolol. 3, angiotensin converting enzyme inhibitors: these drugs block the action of renin angiotensin, diastolic blood vessels and reduce water and sodium retention. Such as benazepril, lenopril, etc. 4, angiotensin II receptor blockers: through the inhibition of angiotensin receptors, play a similar role to angiotensin converting enzyme inhibitors. Such as valsartan, temisartan, etc. 5, calcium channel blockers: through the inhibition of calcium ions into the heart cells and muscle cells within the walls of blood vessels to slow down your heart rate, vasodilatation to reduce blood pressure. Such as amlodipine, nifedipine, etc. These drugs have different mechanisms of action and can be used in the initial and maintenance treatment of hypertension, but each has its own characteristics and indications.