Co-Diovan Tab 80/12.5 strip is a combination medication mainly used to treat hypertension (high blood pressure). Each tablet contains 80 mg of Valsartan, an angiotensin II receptor blocker (ARB), and 12.5 mg of Hydrochlorothiazide, a thiazide diuretic. Valsartan works by relaxing blood vessels, allowing blood to flow more easily, while Hydrochlorothiazide helps to reduce excess salt and water in the body through urination, further lowering blood pressure. This dual-action formula helps prevent strokes, heart attacks, and kidney problems by maintaining optimal blood pressure levels.