How does lasix (furosemide) for low urine output help?

Depends on cause.: Lasix (furosemide)'s a medicine / poison that tricks the kidneys into losing urine while the drug is around. It can damage the kidneys if urine production is shut down as a defense mechanism. However, if the kidney is shutting down because it's not getting enough blood (because the heart is too overburdened with fluid to pump effectively) then Lasix (furosemide) will be helpful in unloading excess fluid & helping the hear