Winbp 40 H Tablet is used to treat high blood pressure (hypertension). It contains Olmesartan medoximil and Hydrochlorothiazide, which relaxes and widens the narrowed blood vessels. This allows the blood to flow more smoothly in the blood vessels, and the heart can pump more efficiently. Also, it removes extra water/fluid and certain electrolyte overload from the body. In some cases, you may experience side effects such as nausea, upset stomach, dehydration, headache, diarrhoea, electrolyte imbalance, dizziness, and decreased blood pressure. Before taking this medicine, you should tell your doctor if you are allergic to any of its components or if you are pregnant/breastfeeding, and about all the medications you are taking and pre-existing medical conditions.