Lasix (generic furosemide) is a medication used to treat fluid retention due to heart failure, liver disease, or kidney issues, as well as high blood pressure. Each tablet contains 40 mg of furosemide and is produced by Sanofi India Limited, with various trade names available. The medication has specific dosage guidelines, contraindications, and potential side effects, including hypotension and electrolyte disturbances, and should be used with caution in certain populations.