LASIX® (Furosemide)
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Important Safety Information

LASIX® (furosemide) is an infusion medication mainly used to reduce fluid buildup caused by certain underlying medical conditions — such as kidney and/or liver disease, as well as heart failure. As a result, the patient experiences relief from symptoms such as shortness of breath and the discomfort that comes from edema. Since the drug is a diuretic, it causes an increase in the need to urinate. LASIX® is also used to treat high blood pressure (hypertension). It can be used in pediatric and adult patients.

LASIX® may have a harmful interaction with other medications — especially with cancer medications, drugs for heart or blood pressure, diuretics, phenytoin, lithium, chloral hydrate, and ethacrynic acid. Tell your doctor about any drugs you’re taking, whether they’re prescription, over-the-counter, herbal supplements, or vitamins. In addition, discuss your medical history thoroughly, especially if you have any of the following conditions:

  • Thyroid disorder
  • Diabetes
  • Drug allergies
  • Electrolyte imbalances
  • High cholesterol
  • Cirrhosis
  • Gout
  • Lupus
  • Kidney disease
  • Bladder obstruction
  • Enlarged prostate

Taking high doses of furosemide may result in permanent hearing loss. It is unknown whether LASIX® could harm an unborn child. Therefore, tell your doctor if you’re pregnant, there’s a possibility you may be pregnant, or you’re trying to conceive. The medication can also be passed to your child through breast milk. Therefore, tell your doctor if you’re breastfeeding or planning on doing so.

What is the most important information I should know about LASIX®?

Taking high doses of furosemide may cause irreversible permanent hearing loss. Therefore, it is crucial to administer this medication as instructed.

The dye contained in certain magnetic resonance imaging (MRI) could cause serious damage to your kidneys when it interacts with furosemide. Therefore, tell your doctor if you’ve had this type of imaging done recently to discuss your options.

Side Effects of LASIX®

As with any prescription medication, LASIX® carries the risk of side effects. The most common ones include:

  • Headache
  • Dizziness
  • Blurred vision
  • Diarrhea
  • Constipation
  • Numbness
  • Tingling

In rare instances, LASIX® could cause more serious side effects. These could be a sign of an allergic reaction, pancreas or kidney problems, high blood sugar, or electrolyte imbalance. Tell your doctor immediately if you experience any of the following:

  • Ringing in your hears
  • Fever
  • Lightheadedness
  • Weakness
  • Painful urination
  • Dry mouth
  • Increased thirst
  • Increased urination
  • Easy bruising
  • Drowsiness
  • Mood swings
  • Muscle Pain
  • Rapid heart rate
  • Nausea
  • Vomiting

Tell your doctor if you experience any negative side effects. You are also encouraged to report such side effects to the Food and Drug Administration (FDA) by visiting, or by calling 1-800-FDA-1088.


LASIX® is used to treat fluid buildup from heart failure and liver and/or kidney disease. Dosage recommendations depend on the patient’s medical condition, age, and weight. It is recommended to start with a lower dose for older patients to reduce the risk of side effects.

Please refer to the full prescribing information.