How does furosemide work?
Furosemide blocks the reabsorption of sodium and water in the kidneys, leading to increased urine production. This helps reduce fluid buildup in the body and lowers blood pressure.
What is furosemide used to treat?
Furosemide is commonly prescribed for:
- Fluid retention (oedema) caused by heart failure, kidney disease, or liver disease
- High blood pressure (hypertension)
- Pulmonary oedema (fluid in the lungs)
Who can take furosemide?
Furosemide is suitable for most adults and children, but your doctor will assess if it’s right for you.
Who might not be able to take furosemide?
Furosemide may not be suitable if you:
- Have severe dehydration
- Have low blood pressure
- Have kidney or liver disease
- Have a history of gout
- Have an electrolyte imbalance (such as low potassium levels)
Can I take furosemide if I’m pregnant or breastfeeding?
Furosemide isn’t usually recommended during pregnancy or while breastfeeding, as it may reduce fluid levels too much. Speak to your doctor for alternative treatments.
What if I miss a dose?
If you forget a dose, take it as soon as you remember. If it’s close to your next dose, skip the missed one—do not take two doses at once.
How effective is furosemide?
Furosemide is highly effective at reducing excess fluid in the body and lowering blood pressure. It usually starts working within 1 hour, with effects lasting up to 6 hours.
What should I do if I take too much?
Taking too much furosemide can cause dehydration, low blood pressure, dizziness, or electrolyte imbalances. If you think you’ve taken too much, seek medical help immediately.
What dose of furosemide is usually taken?
- For fluid retention (oedema): 20mg to 80mg once or twice daily
- For high blood pressure: 20mg to 40mg twice daily
Your doctor will determine the best dose for your condition.
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What are the side effects of furosemide?
Common side effects include:
- Frequent urination (especially soon after taking it)
- Dizziness or lightheadedness
- Dehydration (dry mouth, thirst, tiredness)
- Low potassium levels (muscle cramps, weakness)
Serious side effects, such as severe dehydration, hearing loss, or allergic reactions, require urgent medical attention.
How should I take furosemide?
Furosemide is taken as a tablet or liquid, usually once or twice daily, swallowed whole with water.
When should furosemide be taken?
Furosemide is best taken in the morning or early afternoon to avoid needing to urinate frequently at night.
What are the brand names for furosemide?
Furosemide is available as a generic medicine, but some branded versions include:
- Lasix
- Frusol
Final thoughts
Furosemide is an effective diuretic for treating fluid retention and high blood pressure. To get the best results, take it as prescribed, stay hydrated, and speak to your doctor if you experience side effects.
