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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.
How Does Furosemide Work? Furosemide is a diuretic, a medication that is used to help reduce the amount of fluid in the body by increasing the volume of urine passed. More specifically, it is referred to as a loop diuretic, because furosemide acts on the loop of Henle (part of the kidney) to stop the kidney from reabsorbing sodium and chloride.