Irbesartan is an angiotensin II receptor inhibitor, which can be divided into AT1 and AT2. Irbesartan can inhibit the transformation of Ang Ⅰ into ang Ⅱ by selectively blocking the AT1 receptor of ANGLI, and specifically antagonize the angiotensin converting enzyme 1 receptor. The antagonism of irbesartan to AT1 is 8500 times that of AT2, It can inhibit the vasoconstriction and the release of aldosterone. This product does not inhibit angiotensin converting enzyme, renin, other hormone receptors, and ion channels related to blood pressure regulation and sodium balance. Irbesartan is the most effective drug in the treatment of hypertension and cardiovascular disease.