Bumex (Bumetanide) – Oral


Before taking Bumex, it is important to understand its health risks. Taking large amounts of this medication is associated with very low water and electrolyte levels in the body. Careful medical supervision from your healthcare provider is required with this medication, and dose changes should be adjusted based on your needs.

What Is Bumex?

Bumex (bumetanide) is a prescription-only medication used to treat swelling caused by excess fluid in the body.

Excess fluid can be caused by certain conditions such as congestive heart failure, liver disease, and kidney disease.

Bumex works on parts of the kidneys and blocks certain chemicals, such as sodium (salt), chloride, calcium, and potassium, from being absorbed back into the body. This allows the kidneys to get rid of extra water and sodium through urine, reducing fluid in the body. Bumex belongs to a class of medications known as loop diuretics.

Bumetanide is a strong fluid-lowering drug (diuretic), so it can sometimes cause too much water and electrolytes (like potassium) in the blood to be lost, leading to severe health problems. It is important to follow up with your healthcare provider regularly and undergo labs as instructed.

Bumex is available as a tablet to be taken by mouth.

Drug Facts

Generic Name: Bumetanide

Brand Name(s): Bumex

Drug Availability: Prescription

Administration Route: Oral

Therapeutic Classification: Loop diuretic 

Available Generically: Yes

Controlled Substance: N/A

Active Ingredient: Bumetanide

Dosage Form(s): Tablet

What Is Bumex Used For?

The Food and Drug Administration (FDA) approved Bumex to reduce excess fluid in the body that is caused by congestive heart failure, liver disease, and kidney disease. As a loop diuretic, it helps your kidneys get rid of excess water and salt from the body through the urine.

How to Take Bumex

Always follow the directions given to you by your healthcare provider on how to take Bumex. The appropriate dose is patient-specific, and careful monitoring of your individual response is required when taking this medication.

Due to how this medication works, it is best to take it in the morning since it causes frequent urination. It is not recommended to take it at bedtime since it can keep you up at night due to the urge to urinate.


Store Bumex tablets in a cool, dry place at room temperature (between 68 and 77 degrees F). Do not expose it to hot or cold temperatures for long periods. These environments can impact how well your medication works. Do not freeze this medication. Keep your pills out of reach of children and pets to prevent accidental consumption.

Since it is not a medication requiring extra care, getting refills for it should not be difficult. Generally, it is best to contact your pharmacist before running out of the medication to put in a refill request.

Off-Label Uses

Along with reducing excess fluid levels, Bumex has been studied as an off-label treatment for other conditions. A healthcare provider may prescribe off-label treatments when the decision is supported by scientific evidence or expert clinical experience.

Some well-established off-label uses are listed below: 

  • High blood pressure (hypertension)
  • Frequent urination at night: Bumex reduces salt and water levels before bedtime to help with nighttime awakenings due to the urge to urinate.
  • Advanced chronic kidney disease (CKD): When used along with another diuretic called chlorthalidone, Bumex was shown to be useful in providing additional control with high blood pressure and too much fluid in the body.

The following are newer off-label uses for Bumex that have shown some results but require additional research:

  • Bumex has been used along with another medication called phenobarbital to treat seizures in newborns.
  • Bumex has also been found to improve the symptoms of autism spectrum disorder (ASD) in children.

How Long Does Bumex Take to Work?

Bumex is a relatively fast-acting medication that works as quickly as 30 to 60 minutes after being taken by mouth. This medication reaches peak activity within one to two hours. It can last in the body for four to six hours.

What Are the Side Effects of Bumex?

This is not a complete list of side effects, and others may occur. A healthcare provider can advise you on side effects. If you experience other effects, contact your pharmacist or a healthcare provider. You may report side effects to the FDA at www.fda.gov/medwatch or 800-FDA-1088.

Common Side Effects

Bumex is a medication that requires close monitoring. The following are common side effects that have been observed:

Severe Side Effects

The following are serious side effects that have occurred while taking this medication. Call 911 if your symptoms feel life-threatening or if you think you’re having a medical emergency. Serious side effects can include the following:

  • Impaired hearing: This includes loss of hearing and decreased hearing.
  • Changes in heart rhythm: This can include a heartbeat that is too fast, too slow, or irregular.
  • Hypokalemia (low potassium): Symptoms can include muscle cramps and pain, weakness, fatigue, paralysis, constipation, and respiratory failure.
  • Dehydration: Symptoms can include increased thirst, dry mouth and nose, fatigue and muscle weakness or pain, headache, dizziness, and urinating less or having dark urine.
  • Kidney failure: Symptoms can include a gradual decrease in urine output, fluid retention (swelling in the legs, ankles, or feet), nausea, shortness of breath, and fatigue.

There are no documented side effects occurring after Bumex was stopped.

Report Side Effects

Bumex may cause other side effects. Call your healthcare provider if you have any unusual problems while taking this medication.

If you experience a serious side effect, you or your provider may send a report to the FDA's MedWatch Adverse Event Reporting Program or by phone (800-332-1088).

Dosage: How Much Bumex Should I Take?

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The dose of this medicine will be different for different patients. Follow your doctor's orders or the directions on the label. The following information includes only the average doses of this medicine. If your dose is different, do not change it unless your doctor tells you to do so.

The amount of medicine that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.

  • For oral dosage form (tablets):
    • For edema:
      • Adults—0.5 to 2 milligrams (mg) once a day. Your doctor may adjust your dose if needed.
      • Children—Use and dose must be determined by your doctor .


Due to the possible effects of this medication, there may be changes to how it is used. Therefore, it is important for users to be aware of the following when taking Bumex.


There are no well-controlled studies of Bumex use during pregnancy. Bumex should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.

Nursing or Breastfeeding

It is not known whether the active ingredient of Bumex is excreted in breast milk. As a general rule, it is not recommended to breastfeed while taking Bumex since the drug may be passed to the infant in breast milk.


The safety and efficacy of this medication in children 17 and under have not been established.

Older Adults

People who are 65 and older are more likely to have decreased kidney function. Care should be taken when choosing a dose, and it may be useful to monitor kidney function.

Missed Dose

If you miss a dose of Bumex, you should take it as soon as you remember. If the time when you remember happens to be close to the next scheduled dose, skip the missed dose and only take the upcoming scheduled dose.

Overdose: What Happens If I Take Too Much Bumex?

Overdosing on Bumex can lead to severe water loss and electrolyte loss as well as dehydration and decreased blood volume with the possibility of forming life-threatening blood clots.

Common signs of electrolyte loss include:

  • Weakness
  • Dizziness
  • Mental confusion
  • Feeling tired
  • Vomiting
  • Muscle cramps

Severe electrolyte loss can be life-threatening and require hospitalization for proper treatment. Your healthcare provider may need to replace your fluids and electrolytes.

What Happens If I Overdose on Bumex?

If you think you or someone else may have overdosed on Bumex, call a healthcare provider or the Poison Control Center (800-222-1222).

If someone collapses or isn't breathing after taking Bumex, call 911 immediately.


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It is very important that your doctor check your progress at regular visits to make sure this medicine is working properly. Blood tests may be needed to check for unwanted effects .

This medicine may cause you to lose more potassium from your body than normal. Your doctor will monitor the potassium in your blood while you are taking this medicine. To prevent the loss of too much water and potassium, tell your doctor if you become sick with severe or continuing nausea, vomiting, or diarrhea. Check with your doctor right away if you have one or more of these symptoms: dry mouth; increased thirst; muscle cramps; or nausea or vomiting .

Bumetanide can lower the number of platelets in your blood. Platelets are necessary for proper blood clotting. Check with your doctor immediately if you notice any unusual bleeding or bruising; black, tarry stools; blood in the urine or stools; or pinpoint red spots on your skin .

This medicine may cause changes in your blood sugar levels. If you notice a change in the results of your blood or urine sugar tests, or if you have any questions, check with your doctor .

What Are Reasons I Shouldn’t Take Bumex?

You should not be prescribed Bumex if:

  • Your kidneys are unable to produce urine.
  • You are in a coma due to liver disease.
  • You're experiencing severe electrolyte loss.

Bumex should also be discontinued if you experience an increase in blood urea nitrogen (BUN) or creatinine or if you develop low urine output (oliguria) during therapy.

What Other Medications Interact With Bumex?

Although rare, Bumex has the potential to cause hearing damage.

Due to this, the use of antibiotics that can also cause hearing damage should be avoided unless specifically instructed otherwise by a healthcare provider.

The following are antibiotics that can affect hearing:

  • Streptomycin
  • Amikacin
  • Gentamicin

There's also limited information on using Bumex with medications that can damage the kidneys. Therefore, it is not recommended to use these drugs together.

The following medications can cause injury to the kidneys:

  • Gengraf, Neoral, Sandimmune (cyclosporine)
  • Prograf (tacrolimus)
  • Trexall, Rasuvo (methotrexate)

Bumex has been shown to increase the effect of medications that lower blood pressure. Due to this interaction, your blood pressure medications may require a lower dose. The following are common medications used to control high blood pressure:

  • Zestril (lisinopril)
  • Toprol XL, Lopressor (metoprolol)
  • Norvasc (amlodipine)

What Medications Are Similar?

Bumex belongs to a class of medications known as loop diuretics. The following are also part of this drug class:

Diuretics are a broad class of medications. Other diuretics that target different parts of the kidneys are listed below:

This is a list of drugs commonly used to reduce fluid levels in the body. It is not a list of drugs recommended to take with Bumex. In fact, you should not take these drugs together. Talk to your pharmacist or a healthcare provider if you have any questions.

Frequently Asked Questions

  • Why does this medication make me urinate more often?

    Diuretics are medications that target different parts of the kidneys. Bumex causes less salt and chlorine to be reabsorbed in certain parts of the kidneys.

    Since less is reabsorbed, more sodium and chlorine, as well as other electrolytes, are eliminated from the body. This increases the formation of urine by the kidneys.

  • How long does Bumex take to work?

    Bumex is a fast-acting medication. You can expect it to work within 30 to 60 minutes after taking it.

  • How much does Bumex cost?

    How much you pay for Bumex will vary depending on your health insurance and pharmacy. However, Bumex has a generic equivalent available that is cheaper.

How Can I Stay Healthy While Taking Bumex?

To stay healthy while taking Bumex, follow your healthcare provider's directions on how and when to take it.

You should also drink enough water to prevent dehydration. Generally, the National Academy of Sciences recommends 13 8-ounce cups per day for men and nine 8-ounce cups per day for women. However, actual water intake needs can vary depending on factors that include your age, how much you sweat, and your level of physical activity. Talk to your healthcare provider about how much water you should be drinking.

Additionally, try to maintain a healthy diet and exercise regimen. For exercising, you can start with an achievable goal that works for you and slowly increase the frequency and intensity as tolerated. Talk to your healthcare provider before starting any new exercise plans.

Medical Disclaimer

Verywell Health's drug information is meant for educational purposes only and is not intended to replace medical advice, diagnosis, or treatment from a healthcare provider. Consult your healthcare provider before taking any new medication(s). IBM Watson Micromedex provides some drug content, as indicated on the page.

The author would like to recognize and thank Cody Ryan Thomas for contributing to this article.

9 Sources
Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
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