Furosemide

Supportive Care

What is furosemide?

Furosemide (also known as Lasix®) is used to help rid the body of extra fluid. This type of medicine is called a diuretic. It also helps lower blood pressure. Furosemide comes as a 20 mg tablet, a 40 mg tablet, and a liquid taken by mouth. It is also available as a clear liquid given into a vein (IV).

How to take and store furosemide

Store all forms at room temperature, away from heat, light, and moisture.
May be taken on an empty or full stomach.

Possible side effects

Feeling dizzy
Headache
Diarrhea (when taking the liquid medicine)
Low blood pressure
High blood sugar
Loss of potassium in the blood
Decreased appetite
Stomach upset or abdominal pain
Change in kidney function
Rash and itching
Changes in hearing
Allergic reaction with the following symptoms: rash, hives, itching, chills, fever, swelling in the facial area.

Symptoms of an allergic reaction include: rash, hives, itching, chills, fever, headache, muscle ache, shortness of breath, coughing, tightness in the throat, swelling of the face or neck.

Not all patients who take furosemide will experience these side effects. Common side effects are bolded, but there may be others. Please report all suspected side effects to your doctor or pharmacist.

Find more information on side effects.

Tips for patients and families

Be sure to discuss all questions and instructions with your doctor or pharmacist.

This medicine may make your skin more sensitive to sunlight. Use sunscreen when you are outdoors or wear protective clothing.
If you develop a rash while taking furosemide, tell your doctor right away.
This medicine may make you feel dizzy. Do not operate heavy equipment or drive a motor vehicle until you see how this medicine will affect you.

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Always check the medication label. Many medicines look the same. Do not take any new medicine, including over-the counter medicines or supplements, without checking with your doctor or pharmacist. Talk to your doctor or pharmacist about what to do in the case of a missed dose, allergic reaction, or medical emergency.

This information is not intended to be a complete guide and is not a substitute for talking with your provider. Medicine names, appearance, formulas, or availability may vary by clinic location. Always follow the instructions given by your care team.

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