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Lasix is a loop diuretic medication used to treat edema associated with cardiac, renal, and hepatic failure as well as hypertension.

Furosemide is an anthranilic acid derivative that helps treat fluid retention and high blood pressure by preventing the reabsorption of chloride. The medication also helps salt pass into your urine to prevent your body from absorbing too much.

This medication helps treat edema in those with congestive heart failure, liver disease, or a kidney disorder may encounter. Lasix also helps reduce and balance high blood pressure.

Uses and Dosage

Lasix doses will vary depending on the person and condition being treated. Always follow your doctor’s directions and the instructions on the prescription label.

  • Swallow tablets whole
  • For edema, adults usually take 20 to 80mg once daily
  • For hypertension, adults initially take 40mg twice daily
  • Do not double dose
  • Avoid getting up too fast or you may feel dizzy
  • You may need frequent blood tests
  • Use this medication as directed even if you feel well
  • If you need surgery, tell the surgeon you take Lasix
  • Store at room temperature away from light and moisture

Side Effects

Lasix may cause some side effects while it treats edema and hypertension. Contact your doctor for more information concerning any symptoms you may encounter when taking Lasix.

Common Lasix side effects:

  • Diarrhea, constipation
  • Numbness or tingling
  • Headache, dizziness
  • Blurred vision

Serious Side Effects

Some more serious side effects may occur when taking Lasix. Stop taking this medication and seek medical attention right away if you notice any of the following symptoms:

  • Ringing ears, hearing loss
  • Easy bruising, unusual bleeding
  • Sudden weakness or ill feeling
  • Fever, chills
  • Painful or difficult urination
  • Numbness, tingling, or burning pain
  • Light-headed feeling like you might pass out
  • High blood sugar (increased thirst, increased urination, dry mouth, fruity breath)
  • Liver or pancreas problems (loss of appetite, upper stomach pain, nausea or vomiting, dark urine, jaundice)
  • Kidney problems (little or no urination, swelling in feet or ankles, tiredness, shortness of breath)
  • Electrolyte imbalance (dry mouth, increased thirst, mood changes, weakness, drowsiness, lack of energy, muscle pain, fast heartbeats, restlessness, nausea, vomiting)

Allergic Reactions

Do not take Lasix if you are allergic to furosemide. Stop taking this medication immediately and contact your doctor if you notice any signs of an allergic reaction.

Lasix allergy symptoms may include:

  • Hives
  • Difficulty breathing
  • Swelling in face or throat
  • Fever
  • Sore throat
  • Burning eyes
  • Skin pain
  • Red or purple rash
  • Blistering or peeling skin


Do not take Lasix if you can’t urinate.

Taking more than your recommended dose may lead to irreversible hearing loss.

Avoid drinking alcohol while taking Lasix, it may interact with furosemide and cause unwanted side effects.

If you take sucralfate, wait 2 hours before taking Lasix or take it two hours before your sucralfate dose.

Some medications may interact with furosemide and cause a decrease in efficacy or unwanted side effects. Tell your doctor about all your medications, especially the following:

  • Chloral hydrate
  • Lithium
  • Phenytoin
  • Cancer medications
  • Heart or blood pressure medications
  • Other diuretic

To ensure the safety of taking this medication, tell your doctor if you have any of the following:

  • Kidney disease
  • Enlarged prostate
  • Urination problems
  • Liver disease like cirrhosis
  • Imbalanced electrolytes
  • High cholesterol or triglycerides
  • Gout
  • Lupus
  • Thyroid disorder
  • Diabetes
  • Sulfa drug allergy

Make sure your doctor knows if you have recently had an MRI or any other type of scan that requires an injection of radioactive dye into your veins.

Tell your doctor if you are pregnant or plan to become pregnant while taking Lasix to go over a treatment plan and decide if this medication is safe for you to use. Furosemide can pass into breast milk and may slow breast milk production. Consult with your doctor if you are breastfeeding.

Forms and Strength

This medication is available in tablet form.

Lasix tablet strengths:

  • 20mg
  • 40mg
  • 80mg

The 20, 40, and 80mg tablets are all available in quantities of 100 while the 20mg ones also come in groups of 50 and the 40mg ones come in groups of 90.


Do I need to drink a lot of water when taking Lasix?

Lasix may cause you to become dehydrated, but you don’t need to drink a lot of water unless your doctor recommends it. If you have kidney, liver, or heart problems, you may need to limit your fluids. Contact your doctor for advice specific to you and your treatment plan.

When should you expect to urinate after taking Lasix?

You should be able to expect an increase in urination within 1 hour after taking Lasix. Furosemide’s diuretic effect generally reaches its peak within the first two hours and then reduces over 6 or 8 hours.



Additional information

Brand Name:


Scientific Name:


Other Names:

Furosemide, Lasix


20mg, 40mg, 80mg

Quantities Available:

50, 84, 100


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