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. 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] 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 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 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 (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 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 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. Find patient medical information for Furosemide (Lasix) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Lasix (furosemide) is a potent diuretic (water pill) that treats excess fluid or swelling of the body (edema) caused by cirrhosis, chronic kidney failure, heart failure, and kidney disease.