Frusol is a brand name for the medication furosemide, which is a type of diuretic commonly referred to as a "water pill." It is primarily used in the treatment of conditions that cause fluid retention (edema) such as heart failure, liver disease, and kidney disorders. By promoting the production of urine, Frusol helps to remove excess fluid from the body, thereby reducing symptoms associated with fluid overload like swelling in the legs, ankles, and feet, as well as shortness of breath. Furosemide works by blocking the absorption of sodium, chloride, and water in the kidney tubules, leading to a significant increase in urine output. It is important for patients taking Frusol to follow their healthcare provider's instructions closely, including any dietary recommendations, as the medication can also cause the loss of potassium and other essential minerals.