White or almost white, crystalline powder. Furosemide is also called as 4-Chloro-N-(2-furylmethyl)-5- sulfamoylanthranilic acid. It has CAS No. is 54-31-9, Molecular formula is C12H11ClN2O5S and Molecular weight is 330.745 gmol. Furosemide is a water pill that used in the treatment of congestive heart failure and edema. It is avoids your body from absorbing too much salt, letting the salt alternately passed in your urine. This medicine is also useful for high blood pressure (hypertension)