Olmesartan Medoxomil 20mg Tablet is a medicine used to treat high blood pressure and heart failure. Lowering blood pressure helps to prevent future heart attacks and strokes. This medicine is also effective in preserving kidney function in patients with diabetes.it is an angiotensin receptor blocker (ARB). It relaxes the blood vessels by blocking the action of a chemical that usually makes blood vessels tighter. This lowers the blood pressure, allowing the blood to flow more smoothly to different organs and the heart to pump more efficiently. Uses: 1. Lowers high blood pressure (hypertension). 2. This helps prevent strokes, heart attacks, and kidney problems. How it works: 1. Blocks the action of a chemical that tightens blood vessels. 2. This allows blood to flow more easily throughout your body. Important Information: 1. This medication is available by prescription only. 2. Take it exactly as prescribed by your doctor. 3. It may take several weeks to see the full effects of this medication. 4. Common side effects include dizziness, headache, and fatigue. 5. Tell your doctor about all medications you are taking, including over-the-counter drugs, vitamins, and herbal supplements..