Olsertain-H 20 Mg Tablet 15's is a member of a class of drugs known as "anti-hypertensives," which are generally used to treat hypertension by eliminating surplus fluid (electrolytes) from the body. A persistent illness known as high blood pressure causes a strong force of blood against the arterial wall. The risk of heart-related conditions such heart attack, heart failure, stroke, irregular pulse, and other problems therefore rises. Olmesartan medoximil and Hydrochlorothiazide are two medications that are combined to form Olsertain-H 20 Tablet 15's. Olmesartan medoximil is a prodrug that degrades into olmesartan once it is absorbed in the GIT (Gastrointestinal tract). Angiotensin receptor blockers (ARBs) relax and expand constricted blood arteries by blocking the hormone angiotensin.Disclaimer:For more information contact your physician.