What is Olmesar A (5/20 mg)? Olmesar A (5/20 mg) Tablet is a mix of Amlodipine and Olmesartan. It is consumed in the treatment of hypertension. This medication works by loosening up your heart muscles and veins. This advances the smooth progression of blood and makes it simpler for your heart to siphon blood all through the body. How Olmesar A (5/20 mg) Works Olmesar A (5/20 mg) Tablet is a mix of Amlodipine and Olmesartan.Amlodipine works by loosening up your heart muscles and veins so that blood can stream all the more without any problem. Olmesartan unwinds and augments your veins. This brings down your circulatory strain and makes it simpler for your heart to siphon blood all through your body.