Lasix 40mg is a prescription medication containing furosemide, a potent diuretic (water pill) used to treat fluid retention and high blood pressure. Each pack contains 20 tablets for oral use, manufactured by Sanofi. The active ingredient furosemide works by helping the kidneys get rid of excess fluid and salt from the body through increased urine production. This medication requires a prescription and should only be taken under medical supervision. The tablets come in a white box with blue and burgundy labeling, clearly marking the 40mg strength and oral route of administration. Store at room temperature away from moisture and light.