Lasix (Furosemide) Medication


Lasix (Furosemide)

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Lasix is a loop diuretic medication that functions as a water pill, effectively limiting the absorption of excess salt within the body and facilitating its excretion via urine.  

This is primarily indicated for individuals experiencing fluid retention or edema as a result of medical conditions such as congestive heart failure, liver disease, and nephrotic syndrome.  

Lasix may also be utilized in the treatment of high blood pressure or hypertension. 

Uses and Dosage 

To ensure safe and effective use of furosemide, carefully follow the instructions provided in the Patient Information Leaflet. If you have any questions, seek guidance from your doctor or pharmacist. 

Take furosemide orally as directed by your doctor, typically once or twice daily with or without food. To avoid interruptions in your sleep from frequent urination, avoid taking this medication within four hours of bedtime. 

Dosage of furosemide is individualized based on factors such as age, medical condition, and response to treatment. For children, dosage is also based on weight. Older adults typically start with a lower dose to minimize the risk of side effects. Never increase your dose or take it more frequently than directed. 

For the medication to be most effective, take it at the same time each day. Even if you feel well, continue taking furosemide as prescribed. This is especially important for people with hypertension who may not experience any noticeable symptoms. 

Certain medications, such as sucralfate, cholestyramine, and colestipol, can reduce furosemide absorption. To avoid this, separate the timing of furosemide and any of these medications by at least two hours. 

Side Effects 

Allergic Reactions 

  • Hives 
  • Difficult breathing 
  • Swelling in your face or throat 

Severe Side Effects

Severe skin reaction: 

  • Fever 
  • Sore throat 
  • Burning in your eyes 
  • Skin pain 
  • Red or purple skin rash that spreads and causes blistering and peeling 

Contact your doctor immediately if you experience the following: 

  • Ringing in your ears 
  • Hearing loss 
  • Easy bruising 
  • Unusual bleeding 
  • Sudden weakness or ill feeling 
  • Fever and chills 
  • Painful or difficult urination 
  • Numbness, tingling, or burning pain 
  • Light-headedness, feeling like you might pass out 
  • High blood sugar, with symptoms like:
    • Increased thirst
    • Increased urination
    • Dry mouth
    • Fruity breath odor 
  • Signs of liver or pancreas problems, such as:
    • Loss of appetite
    • Upper stomach pain that may spread to your back
    • Nausea or vomiting
    • Dark urine
    • Yellowing of the skin or eyes 
  • Kidney problems, such as:
    • Little or no urination
    • Swelling in your feet or ankles
    • Feeling tired or short of breath 
  • Signs of an electrolyte imbalance, such as:
    • Dry mouth
    • Increased thirst
    • Mood changes
    • Weakness
    • Drowsiness
    • Lack of energy
    • Muscle pain
    • Fast heartbeats
    • Feeling restless
    • Nausea
    • Vomiting 

Common Side Effects  

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


Before using Lasix, inform your healthcare provider of any medical conditions you have, including kidney disease, enlarged prostate, urination problems, cirrhosis or other liver disease, an electrolyte imbalance, high cholesterol, gout, lupus, diabetes, or an allergy to sulfa drugs.  

If you have recently undergone an MRI (magnetic resonance imaging) or any type of scan that uses a radioactive dye injected into your veins, be sure to inform your doctor. 

Do not take more Lasix than the recommended dose and that you continue to take the medication as prescribed, even if you feel well, particularly if you are being treated for high blood pressure. High doses of furosemide can cause irreversible hearing loss. 

Lasix should not be used if you are unable to urinate, and if you experience any adverse reactions or worsening symptoms, consult your healthcare provider promptly. 

Additional information

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Quality Prescription Drugs has provided information from third parties intended to increase awareness and does not contain all the information about Lasix (Furosemide). Talk to your doctor or a qualified medical practitioner for medical attention, advice, or if you have any concerns about Lasix (Furosemide).