Furosemide, sold under the brand name Lasix among others, is a loop diuretic medication used to treat fluid build-up due to heart failure, liver scarring, or kidney disease. It may also be used for the treatment of high blood pressure. It can be taken by injection into a vein or by mouth. When taken by mouth, it typically begins working within an hour, while intravenously, it typically begins working within five minutes. 
Dosage: The dosage of this medicine depends on the prescription and instruction given by your doctor.
Precautions: Do not take this medicine without any medical consultation with your doctor.