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Furosemide (Lasix): uses, side effects & brands
Furosemide is a strong loop diuretic used for fluid overload in heart, kidney and liver disease. It belongs to the Diuretic (water tablet) group. Diuretics help the body remove excess salt and water, lowering blood pressure and reducing swelling.
Drug type — dosing is set by your doctor
| Measure | Range |
|---|---|
| Drug class | Diuretic (water tablet) |
| Type | Prescription |
| Dose | Individual — ask your doctor or pharmacist |
What it is used for
- Fluid retention from heart failure
- Fluid from liver or kidney disease
- Fluid on the lungs (as an injection in hospital)
- Sometimes high blood pressure
Common brand names
- India: Lasix, Frusenex
- Worldwide: Lasix
Common side effects
- Passing a lot of urine within an hour or two
- Dizziness or thirst (dehydration)
- Low potassium or sodium
- Raised uric acid (gout)
Before taking it — precautions
- Take it in the morning (or early afternoon) to avoid night-time toilet trips
- Weigh yourself regularly and have blood salts and kidney function checked
- Tell your doctor about kidney problems, gout, diabetes or other medicines
When to see a doctor urgently
- Severe dizziness, fainting or very little urine (dehydration — urgent)
- Ringing in the ears or hearing loss
- Irregular heartbeat or severe muscle weakness (low potassium)
Frequently asked questions
Why do I pass so much urine after taking furosemide?
It is a strong, fast-acting water tablet that removes extra fluid through the kidneys, usually within a few hours of a dose.
Should I drink less water on furosemide?
Only if your doctor sets a fluid limit, as in heart failure. Otherwise drink normally and report heavy thirst or dizziness.
Why should I weigh myself?
Daily weight shows whether fluid is building up or being lost too fast. Tell your doctor about sudden changes.
Explore more
Sources & further reading
- World Health Organization (WHO)
- MedlinePlus — U.S. National Library of Medicine
- Ministry of Health & Family Welfare, India
- Indian Council of Medical Research (ICMR)
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.