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Furosemide, sold under the brand name Lasix among others, is a medication used to treat fluid build-up due to heart failure, liver scarring, or kidney disease. It may also be used for the treatment of high blood pressure. The amount of medication required depends on the person in question.
1 To prevent excessive retention of fluid, diuretic drugs are often used.  Furosemide is a loop diuretic drug, meaning that it works on the area of the kidney called Henle's loop. This drug prevents the absorption of chloride, sodium, potassium and water, leading to an increased volume of urine.