Lasix, also known as furosemide, is a diuretic and is a prescription medication commonly used after surgery. It is given to increase urine output which in turn can decrease blood pressure, edema, fluid overload, and can stimulate the kidneys when they are not working properly. Lasix (furosemide) is an anthranilic acid derivative that is used as a strong diuretic in adults and children to treat excessive fluid accumulation (edema) caused by congestive heart failure, liver failure, renal failure, and nephritic syndrome.Lasix may be used with antihypertensive drugs to control high blood pressure (hypertension).Lasix is available as a generic. Use Lasix (furosemide tablets) as ordered by your doctor. Read all information given to you. Follow all instructions closely. This medicine may cause you to pass urine more often. To keep from having sleep problems, try not to take too close to bedtime. Do not take sucralfate within 2 hours before or after taking Lasix (furosemide tablets). Lasix also causes potassium to be lost in the urine. Low potassium levels can be dangerous, especially for people with CHF. Low potassium can cause dangerous and even fatal heart arrhythmias. Also, many people with CHF take another drug called digoxin. Without a certain level of potassium in the body, a toxic overload of digoxin accumulates. Most people on Lasix replace potassium on a daily. Myopic refractive errors are common in eyes that develop a retinal detachment. 1, 2 In addition, myopic changes may also be induced by retinal detachment surgery because of the changes in axial length, anterior chamber depth, or position of the crystalline lens. 3, 4 Thus, many patients demand a refractive correction after undergoing retinal detachment surgery. LASIK, which stands for laser in-situ keratomileusis, is a popular surgery to correct vision in people who are nearsighted or farsighted, or who have astigmatism. Learn more about the LASIK eye.