Furosemide

A healthcare provider may prescribe furosemide to treat fluid retention or high blood pressure. By increasing the amount of salt and water that the kidneys remove from the blood and decreasing blood volume, furosemide can effectively control high blood pressure and help with water retention. As with any medication, there are potential side effects of furosemide, including low potassium levels, dizziness, and upset stomach. Because there are possible drug interactions with furosemide, be sure to tell your healthcare provider about any medications you are taking.

 

What Is Furosemide?

Furosemide (Lasix®) is a prescription medicine that is used as a diuretic for high blood pressure and fluid retention. It is part of a class of medicines known as diuretics.
 

Who Makes Furosemide?

Furosemide is made by Hoechst Roussel Pharmaceuticals. Generic furosemide is made by several manufacturers.
 

What Is Furosemide Used For?

Specific uses of furosemide include:
 
(Click What Is Furosemide Used For? for more information on what furosemide is used for, including possible off-label uses.)
 

How Does Furosemide Work?

Furosemide is a diuretic, which is commonly referred to as a "water pill.
 " Specifically, furosemide is known as a "loop diuretic," named after the part of the kidneys that it affects (the loop of Henle). It works by increasing the amount of salt and water the kidneys remove from the blood. This extra salt and water is passed out through the urine. By increasing the amount of water removed from the blood, furosemide causes a decrease in blood volume. Because of this effect, furosemide can lower blood pressure and can also help with water retention.
 
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Written by/reviewed by: Kristi Monson, PharmD; Arthur Schoenstadt, MD
Last reviewed by: Kristi Monson, PharmD;