Co-Diovan 160/12.5mg Tablets is a combination medication used to treat hypertension (high blood pressure). It contains two active ingredients: valsartan (160mg) and hydrochlorothiazide (12.5mg). Valsartan is an angiotensin receptor blocker (ARB), which works by relaxing the blood vessels, making it easier for blood to flow through them. Hydrochlorothiazide is a diuretic that helps to reduce the amount of fluid in the body, which also helps to lower blood pressure. This medication is usually taken once a day, with or without food. The dosage may be adjusted by the doctor depending on the patient's response to the treatment. Common side effects of Co-Diovan 160/12.5mg Tablets include dizziness, headache, nausea, diarrhea, fatigue, and low blood pressure. It is important to take this medication exactly as prescribed and to inform the doctor about any other medications or supplements being taken to avoid interactions.