Lasix (furosemide) is used to treat the symptoms of fluid retention (edema) in individuals with congestive heart failure, liver disease or kidney disorder. Learn side effects, dosage, drug interactions, warnings, patient labeling, reviews, and more. Furosemide (Lasix) is a loop diuretic (water pill) that makes you urinate more. It works in the kidneys to get rid of extra water and electrolytes (like sodium and potassium), which helps ease swelling and lowers blood pressure. Furosemide is used to treat edema excess fluid held in body tissues caused by various medical problems. Furosemide is in a class of medications called diuretics ('water pills'). It works by causing the kidneys to get rid of unneeded water and salt from the body. High blood pressure is a common condition. Lasix is a loop diuretic (water pill) that prevents your body from absorbing too much salt, causing it to be passed in your urine. Lasix treats fluid retention (edema) in people with congestive heart failure, liver disease, or kidney disorders such as nephrotic syndrome. LASIX is indicated in adults and pediatric patients for the treatment of edema associated with congestive heart failure, cirrhosis of the liver, and renal disease, including the nephrotic. Furosemide, sold under the brand name Lasix among others, is a loop diuretic medication used to treat edema due to heart failure, liver scarring, or kidney disease. [6] Furosemide is given to help treat fluid retention (edema) and swelling that is caused by congestive heart failure, liver disease, kidney disease, or other medical conditions. It works by acting on the kidneys to increase the flow of urine. Furosemide is also used alone or together with other medicines to treat high blood pressure (hypertension). Furosemide (Lasix) is a potent diuretic (water pill) that is used to eliminate water and salt from the body. In the kidneys, salt (composed of sodium and chloride), water, and other small molecules normally are filtered out of the blood and into the tubules of the kidney. Furosemide is a loop diuretic used to treat fluid retention (edema) in people with congestive heart failure, liver disease, or a chronic kidney disorder such as nephrotic syndrome. Furosemide is also used to treat high blood pressure (hypertension). Furosemide is a diuretic, also called a water pill, that is commonly used to reduce edema (fluid retention) caused by the following conditions. Furosemide may also be used to treat high blood.