Lasix (Furosemide) injection is a potent loop diuretic ("water pill") used to rapidly eliminate excess salt and water from the body. It is administered intravenously or intramuscularly by medical professionals when oral medications are impractical or in urgent situations. Primary Medical Uses: Acute Pulmonary Edema: Used intravenously for its rapid onset (often within 5 minutes) to quickly relieve life-threatening fluid buildup in the lungs. Severe Edema: Reduces swelling caused by congestive heart failure, liver cirrhosis, or kidney disease (including nephrotic syndrome). Hypertensive Emergencies & Renal Failure: Helps lower dangerously high blood pressure or stimulate urine production in acute kidney failure.