Furosemide is used to treat fluid build-up and swelling caused by congestive heart failure, liver cirrhosis, or kidney disease. Learn about side effects, interactions and indications. Learn about side effects, interactions and indications. 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. [1] Low potassium levels can be dangerous if you are also taking digoxin. You are more likely to develop digoxin toxicity if you have low potassium levels. High potassium levels help prevent digoxin from accumulating in your body. When taking digoxin with furosemide, increase your intake of potassium-rich foods. (Click Digoxin Precautions and Warnings for more information on potassium and digoxin. This article also describes other important safety concerns to be aware of before taking digoxin.) This article also describes other important safety concerns to be aware of before taking digoxin.) There's a possible interaction between Digoxin and Lasix, which may be causing lower levels of potassium and magnesium. Digoxin? Were you made aware of the high risks associated with this drug? INDICATIONS Edema. 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 syndrome. Potassium does't slow down the heart unless the level is very high. The gradient (difference) between intracellular K+ (high number) and extracellular K+ (low number) influences the cell membrane's ability to depolarize. This can be problematic because potassium is important for good health, especially if you have high blood pressure. It plays an important role in the regulation of blood vessel tone , blood pressure, and the pumping action of the heart. digoxin oral increases and furosemide oral decreases serum potassium. Disclaimer: The information contained herein should NOT be used as a substitute for the advice of an appropriately qualified and licensed physician or other health care provider. The information provided here is for informational Describes the medication furosemide (Lasix), a drug used to treat excessive fluid accumulation and swelling (edema) of the body caused by heart failure, cirrhosis, chronic kidney failure, and nephrotic syndrome. Read more about the prescription drug furosemide (Lasix).