Active Ingredients: Furosemide Benefits: Lasix is an oral diuretic prescribed for treatment of cardiac disease and congestive heart failure. It can also be used to treat acute, non-inflammatory tissue edema in dogs and cats. Lasix is an effective diuretic possessing a wide therapeutic range by promoting the rapid removal of excess fluid that can build up as a result of kidney failure, heart failure and other medical problems. It may also be used to treat high blood pressure. Directions: To be used as prescribed by your veterinarian. Caution: Keep out of reach of children and pets.