How soon after starting furosemide will my symptoms improve?

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Furosemide (Lasix), a diuretic, works quickly to relieve edema, or fluid retention. About an hour after you take it, you'll find that you need to urinate. This effect continues for about six hours or more.

Edema is a common side effect of heart failure as well as liver disease. By reducing the amount of fluid in your system, furosemide may also help lower high blood pressure.