Benzthiazide is a medication primarily used as a diuretic, which helps the body eliminate excess fluid by increasing urine production. It is often prescribed to treat conditions such as high blood pressure and edema, which is swelling caused by fluid retention. This drug works by inhibiting sodium reabsorption in the kidneys, leading to increased excretion of sodium and water. As a result, it can help lower blood pressure and reduce swelling. Like other diuretics, Benzthiazide may have side effects, including electrolyte imbalances, so monitoring by a healthcare provider is essential.