Telmisartan itself is a long-acting antihypertensive drug, and there is no clinical type of formulation of telmisartan extended-release tablets. Telmisartan is an angiotensin II receptor antagonist, and its antihypertensive effect is through blocking the tissue angiotensin II receptor subtype, angiotensin receptor I, which can effectively block the vasoconstriction, water and sodium retention and remodeling effect of angiotensin II, so as to play a role in lowering blood pressure, and its antihypertensive effect is slow, but smooth and long-lasting. Telmisartan is also commonly used in the treatment of chronic heart failure, post-myocardial infarction, and hypertensive myocardial hypertrophy because of its ability to inhibit vascular and myocardial remodeling and improve the prognosis of patients. Telmisartan should not be used in patients with pregnancy, hyperkalemia, and bilateral renal artery stenosis.