Lasix® it is a diuretic that is a derivative of anthranilic acid. Lasix tablets for oral administration contain furosemide as the active ingredient and the following inactive ingredients: lactose monohydrate NF, magnesium stearate NF, starch NF, talc USP, and colloidal silicon dioxide NF. Chemically, it is 4-chloro-N-furfuryl-5-sulfamoylanthranilic acid. Lasix is available in white tablets for oral administration in doses of 20, 40 and 80 mg. Furosemide is a white to off-white, odorless crystalline powder. It is practically insoluble in water, sparingly soluble in alcohol, freely soluble in dilute alkaline solutions, and insoluble in dilute acids. Information for patients (Spain) Patients receiving Lasix should be warned that they may experience symptoms of excessive fluid and/or electrolyte losses. Postural hypotension that sometimes occurs can usually be controlled by getting up slowly. Potassium supplementation and/or dietary measures may be necessary to control or prevent hypokalemia. Patients with diabetes mellitus should be told that furosemide may increase blood glucose levels and thus affect urine glucose tests. Some patients' skin may be more sensitive to the effects of sunlight while taking furosemide. Hypertensive patients should avoid medications that can increase blood pressure, including over-the-counter products for appetite suppression and cold symptoms.