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Lasix oral solution is a medication that contains the active ingredient furosemide. It is used to reduce excess fluid in the body, a condition known as edema, which can be caused by heart failure, liver disease, or kidney disease.

Use and Dosage

Read the Patient Information Leaflet if available from your pharmacist before you start taking furosemide and each time you get a refill. If you have any questions, ask your doctor or pharmacist.

Take this medication by mouth as directed by your doctor, with or without food, usually once or twice daily. It is best to avoid taking this medication within 4 hours of your bedtime to prevent having to get up to urinate. Carefully measure the dose using the special measuring device/spoon that comes with your prescription. Do not use a household spoon because you may not get the correct dose.

Dosage is based on your medical condition, age, and response to treatment. For children, the dose is also based on weight. Older adults usually start with a lower dose to decrease the risk of side effects. Do not increase your dose or take it more often than directed.

Take this medication regularly to get the most benefit from it. To help you remember, take it at the same time(s) of the day as directed. Keep taking this medication even if you feel well. Most people with high blood pressure do not feel sick.

Sucralfate, cholestyramine, and colestipol can decrease the absorption of furosemide. If you are taking any of these drugs, separate the timing of each dose from furosemide by at least 2 hours.

Tell your doctor if your condition does not improve or if it worsens (for example, your blood pressure readings remain high or increase).

Side Effects

Dizziness, lightheadedness, headache, or blurred vision may occur as your body adjusts to the medication. If any of these effects last or get worse, tell your doctor or pharmacist promptly.

To reduce the risk of dizziness and lightheadedness, get up slowly when rising from a sitting or lying position.

Remember that this medication has been prescribed because your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

This medication may cause dehydration and electrolyte imbalance. Tell your doctor right away if you have any of these unlikely but serious side effects: muscle cramps, weakness, unusual tiredness, confusion, severe dizziness, fainting, drowsiness, unusual dry mouth/thirst, nausea, vomiting, and fast/irregular heartbeat.

Tell your doctor right away if you have any serious side effects, including signs of kidney problems (such as a change in the amount of urine), numbness/tingling/pain/redness/swelling of the arms/legs, hearing changes (such as ringing in the ears, temporary or permanent decreased hearing/deafness), stomach/abdominal pain, yellowing eyes/skin.

A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, or trouble breathing.

This is not a complete list of side effects. If you notice other effects not listed above, contact your doctor or pharmacist.


  • Before taking furosemide, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.
  • Before using this medication, tell your doctor or pharmacist your medical history, especially of: kidney problems, liver problems, inability to make urine, gout, and lupus.
  • If you have diabetes, furosemide may make it harder to control your blood sugar. Check your blood sugar regularly as directed and share the results with your doctor.
  • Furosemide may reduce the potassium level in your blood. Your doctor may instruct you to add potassium-rich foods to your diet (such as bananas, and orange juice) or prescribe potassium supplements to prevent potassium loss. Ask your doctor for more details.
  • This medication may make you more sensitive to the sun. Limit your time in the sun. Avoid tanning booths and sunlamps. Use sunscreen and wear protective clothing when outdoors. Tell your doctor right away if you get sunburned or have skin blisters/redness.
  • This drug may make you dizzy or blur your vision. Alcohol or marijuana (cannabis) can make you dizzy. Do not drive, use machinery, or do anything that needs alertness or clear vision until you can do it safely. Limit alcoholic beverages. Talk to your doctor if you are using marijuana (cannabis).
  • Severe sweating, diarrhea, or vomiting can increase the risk of dehydration. Report prolonged diarrhea or vomiting to your doctor. Follow your doctor’s instructions about the amount of fluids you can drink.
  • Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).
  • Babies born early (premature infants) and children may be more sensitive to certain effects of this drug, such as kidney stones.
  • Older adults may be more sensitive to the effects of this drug, especially dizziness and water/mineral loss.
  • During pregnancy, this medication should be used only when needed. Discuss the risks and benefits with your doctor.
  • This drug passes into breast milk and may affect milk production. Consult your doctor before breast-feeding.

Forms and Strengths

Lasix Oral Solution is available in the following forms and strengths:

  • Lasix Oral Solution:
    • 10 mg/ml
    • 8 mg/ml


How should I take Lasix’s oral solution?

The dosage and administration instructions for Lasix oral solution should be followed as directed by your doctor or pharmacist. Take it once or twice a day. You can take Lasix oral solution with water.

What are the equivalent dosages of furosemide oral solution?

The equivalent dosages of furosemide oral solution may vary depending on the specific formulation and concentration.

Consult with your healthcare provider or refer to the product packaging for accurate dosage information.

Are there any precautions or interactions I should be aware of when taking Lasix oral solution?

Inform your doctor or pharmacist about any other medications you are taking, as well as any health conditions you have.

They can provide you with information on medicines to be careful with or avoid while taking Lasix oral solution. Avoid eating large amounts of licorice when taking Lasix.



Additional information

Brand Name:


Scientific Name:


Other Names:

Furosemide, Lasix


20mg, 40mg, 80mg

Quantities Available:

50, 84, 100


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