Angiotensin receptor blockers, also known as angiotensin II receptor antagonists, mainly act on the renin-angiotensin system and are used in the treatment of hypertension, diabetes mellitus, renal disease and heart failure. Angiotensin receptor blockers mainly block the activation of angiotensin I receptors, causing vasodilation, decreased secretion of vasopressin, and decreased synthesis and secretion of aldosterone, resulting in a decrease in blood pressure. Representative drugs include Irbesartan, Valsartan, Olmesartan, Candesartan, and Telmisartan. When using angiotensin receptor blocking drugs, pay attention to monitoring blood pressure, blood potassium and renal function to prevent hyperkalemia.