Blood Pressure Home > Lasix

Lasix is a medication that is prescribed for the treatment of high blood pressure and fluid retention. The medication is classified as a diuretic that works by increasing the amount of salt and water that the kidneys remove from the blood, which causes a decrease in blood volume. Lasix comes in the form of a tablet that is usually taken once or twice a day. Potential side effects of the medication may include low blood potassium levels, dizziness, upset stomach, and sensitivity to the sun.

What Is Lasix?

Lasix® (furosemide) 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 It?

The brand-name drug is made by sanofi-aventis U.S., LLC. Generic Lasix is made by several manufacturers.
 

What Is It Used For?

Specific uses of Lasix include:
 

 

(Click Lasix Uses for more information on what the medication is used for, including possible off-label uses.)
 

How Does Lasix Work?

Lasix is a diuretic, which is commonly referred to as a "water pill." Specifically, it 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, Lasix causes a decrease in blood volume. Because of this effect, the medication can lower blood pressure and can also help with water retention.
 
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
Last updated/reviewed:
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