Olkem H 20 mg Tablet 15's are a combination of the drugs hydrochlorothiazide and olmesartan medoximil. 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. The heart can pump more effectively as a result of the blood flowing through the blood arteries more easily. Hydrochlorothiazide, on the other hand, is a diuretic or water pill that functions by flushing out excess fluid and electrolyte overload from the body. Together, Olkem H 20 mg Tablet 15's minimises the risk of a future heart attack and stroke, increases blood pressure, increases blood flow, and lowers fluid overload.Disclaimer:For more information contact your physician.