Furosemide is a powerful diuretic loop that acts on the kidneys to increase the water loss from the body. It works by increasing the amount of urine produced and excreted to remove excessive water edema from the body. 

The drug is available under several brand names in various forms. It is available in tablet, mouth solution forms, which can be taken throughout the day without food. 

Doctors often prescribe furosemide to treat excess fluid retention or swelling (oedema).

Furosemide belongs to a group of drugs called loop diuretics, also known as water pills. It is administered to treat fluid retention, edema and swelling caused by heart failure, liver disease, kidney disease and other diseases. Furosemides, like Lasix, are a powerful diuretic and water pills are used to remove water and salt from the body.

Furosemide comes in an oral solution that you can take by mouth, or in an injectable solution administered by a doctor. In both cases, they are not available in the same strength as the brand name drug Lasix. Furosemide oral tablets are prescription drugs available under the brand name LASIX.