Olmesartan ester hydrochlorothiazide tablets for a few hours is usually not effective, usually within a week to take effect, two weeks to reach a significant effect. Olmesartan ester hydrochlorothiazide tablets is a compound preparation of olmesartan ester and hydrochlorothiazide, clinically applicable to the treatment of hypertension, usually effective within one week, after two weeks to achieve significant results. In addition, Olmesartan ester hydrochlorothiazide tablets belong to thiazide diuretics, which can produce diuretic effect by affecting the reabsorption mechanism of electrolytes in renal tubules and increasing the excretion of sodium and chloride. When taking the drug, a few patients may experience adverse reactions such as nausea, dizziness, itchy skin, headache, etc., which are usually relieved after stopping the drug. Allergies, children, pregnancy and other people are prohibited to use. Olmesartan ester hydrochlorothiazide tablets belong to the prescription drugs, must be used under the guidance of a physician, not self-medication, in order to avoid adverse reactions.