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Lasix

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Lasix

Lasix Side Effects Center

Medical Editor: Charles Patrick Davis, MD, PhD

Lasix (furosemide) is an anthranilic acid derivative that is used as a strong diuretic. The drug is available as a generic. Lasix can be given orally and by IV. Lasix is used in adults and children to treat excessive fluid accumulation (edema) caused by congestive heart failure, liver failure, renal failure, and nephritic syndrome. Some clinicians use Lasix with antihypertensive drugs to control hypertension. Side effects include increased urination, thirst, muscle cramps, weakness and constipation. Serious side effects include dehydration, fever, electrolyte abnormalities and rapid weight loss.

Lasix is available in tablet (20 to 80 mg) and IV forms. Dosage is determined by the patient's physician and varies according to how much fluid and how fast the fluid should be removed. Patients with poor renal function usually require higher doses; doses in children are weight-based. Patients taking antihypertensive medications should inform their doctors if they start Lasix because the drug may lower blood pressure substantially in some patients. Lactating females should not take Lasix; pregnant females must consult their doctors about its use.

Our Lasix Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What is Patient Information in Detail?

Easy-to-read and understand detailed drug information and pill images for the patient or caregiver from Cerner Multum.

Lasix in Detail - Patient Information: Side Effects

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Stop using furosemide and call your doctor at once if you have a serious side effect such as:

  • ringing in your ears, hearing loss;
  • itching, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes);
  • severe pain in your upper stomach spreading to your back, nausea and vomiting;
  • weight loss, body aches, numbness;
  • swelling, rapid weight gain, urinating less than usual or not at all;
  • chest pain, new or worsening cough with fever, trouble breathing;
  • pale skin, bruising, unusual bleeding, feeling light-headed, rapid heart rate, trouble concentrating;
  • low potassium (confusion, uneven heart rate, leg discomfort, muscle weakness or limp feeling);
  • low calcium (tingly feeling around your mouth, muscle tightness or contraction, overactive reflexes);
  • headache, feeling unsteady, weak or shallow breathing; or
  • severe skin reaction -- fever, sore throat, swelling in your face or tongue, burning in your eyes, skin pain, followed by a red or purple skin rash that spreads (especially in the face or upper body) and causes blistering and peeling.

Less serious side effects may include:

  • diarrhea, constipation, stomach pain;
  • dizziness, spinning sensation; or
  • mild itching or rash.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Read the entire detailed patient monograph for Lasix (Furosemide) »

What is Patient Information Overview?

A concise overview of the drug for the patient or caregiver from First DataBank.

Lasix Overview - Patient Information: Side Effects

SIDE EFFECTS: Dizziness, lightheadedness, headache, or blurred vision may occur as your body adjusts to the medication. If any of these effects persist or worsen, 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 your doctor has prescribed this medication because he or she 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 a serious loss of body water (dehydration) and salt/minerals. 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, fast/irregular heartbeat, unusual decrease in the amount of urine.

Tell your doctor right away if any of these unlikely but serious side effects occur: 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, trouble breathing.

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

In the US -

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

Read the entire patient information overview for Lasix (Furosemide)»

What is Prescribing information?

The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.

Lasix FDA Prescribing Information: Side Effects
(Adverse Reactions)

SIDE EFFECTS

Adverse reactions are categorized below by organ system and listed by decreasing severity.

Gastrointestinal System Reactions

  1. hepatic encephalopathy in patients with hepatocellular insufficiency
  2. pancreatitis
  3. jaundice (intrahepatic cholestatic jaundice)
  4. increased liver enzymes
  5. anorexia
  6. oral and gastric irritation
  7. cramping
  8. diarrhea
  9. constipation
  10. nausea
  11. vomiting

Systemic Hypersensitivity Reactions

  1. Severe anaphylactic or anaphylactoid reactions (e.g. with shock)
  2. systemic vasculitis
  3. interstitial nephritis
  4. necrotizing angiitis

Central Nervous System Reactions

  1. tinnitus and hearing loss
  2. paresthesias
  3. vertigo
  4. Dizziness
  5. Headache
  6. blurred vision
  7. xanthopsia

Hematologic Reactions

  1. aplastic anemia
  2. thrombocytopenia
  3. agranulocytosis
  4. hemolytic anemia
  5. Leucopenia
  6. Anemia
  7. Eosinophilia

Dermatologic-Hypersensitivity Reactions

  1. toxic epidermal necrolysis
  2. Stevens-Johnson Syndrome
  3. erythema multiforme
  4. drug rash with eosinophilia and systemic symptoms
  5. acute generalized exanthematous pustulosis
  6. exfoliative dermatitis
  7. bullous pemphigoid
  8. Purpura
  9. Photosensitivity
  10. Rash
  11. Pruritis
  12. Urticaria

Cardiovascular Reaction

  1. Orthostatic hypotension may occur and be aggravated by alcohol, barbiturates or narcotics.
  2. Increase in cholesterol and triglyceride serum levels

Other Reactions

  1. hyperglycemia
  2. glycosuria
  3. hyperuricemia
  4. muscle spasm
  5. weakness
  6. Restlessness
  7. urinary bladder spasm
  8. Thrombophlebitis
  9. fever

Whenever adverse reactions are moderate or severe, LASIX dosage should be reduced or therapy withdrawn.

Read the entire FDA prescribing information for Lasix (Furosemide) »

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Lasix - User Reviews

Lasix User Reviews

Now you can gain knowledge and insight about a drug treatment with Patient Discussions.

Here is a collection of user reviews for the medication Lasix sorted by most helpful. Patient Discussions FAQs

Report Problems to the Food and Drug Administration

 

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.


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