Lasix (Furosemide)

Lasix
4.854 ratingsReviews
Generic:
Furosemide
Indications:
congestive heart failure hypertension swelling
Analogs:
Furosemide Bumetanide Torsemide Ethacrynic Acid Hydrochlorothiazide Chlorthalidone Indapamide Spironolactone Bumex Demadex Edecrin Aldactone Metolazone
AdultsPregnancyAllergiesDiabetesBreastfeedingChildrenDriving

Dosages

Lasix 40 mg

Quantity Price per tablet You save Total price
10 £4.59 - £45.93
20 £2.59 £40.00 £51.86
30 £1.93 £80.01 £57.78
60 £1.06 £211.87 £63.71
90 £0.77 £343.73 £69.64
120 £0.62 £476.33 £74.82
180 £0.45 £745.99 £80.75
270 £0.34 £1,148.24 £91.86
360 £0.29 £1,549.75 £103.71

Lasix 100 mg

Quantity Price per tablet You save Total price
10 £4.67 - £46.67
20 £2.56 £42.23 £51.12
30 £1.90 £82.97 £57.04
60 £1.04 £217.80 £62.23
90 £0.81 £347.44 £72.60
120 £0.69 £477.82 £82.23
180 £0.51 £747.47 £92.60
270 £0.46 £1,136.39 £123.71
360 £0.40 £1,535.68 £144.46

Manufacturers

ApotexApotex Inc.Aventis Pharma LimitedGeno Pharmaceuticals LimitedHexal AGMedibest Pharma Pvt. Ltd.ratiopharmratiopharm GmbHSanofiSanofi-AventisSanofi-Aventis AustraliaSanofi-Aventis Australia Pty LtdSanofi-Aventis CanadaSanofi-Aventis Canada Inc.Sanofi-Aventis DeutschlandSanofi-Aventis Deutschland GmbHSanofi-Aventis FranceSanofi-Aventis, S.A.Sanofi-Aventis U.S. LLCSanofi S.r.l.Sanofi Winthrop IndustrieTeva CanadaValidus Pharmaceuticals

Payment & Delivery

Package Example

Your order is carefully packed and ships within 24 hours. Here's the typical package.

Sized like a regular personal letter (24x11x0.7 cm), with no indication of its contents.

Front View
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Side View
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Back View
Back View
Delivery Times
Delivery MethodEstimated delivery
Express Free for orders over £222.24Estimated delivery to the UK: 4-7 days
Standard Free for orders over £148.16Estimated delivery to the UK: 14-21 days
EMSRoyal Mail
Payment Methods
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Discount Coupons

  • New Year's Day - 1 January 2026 9% NEWYEAR9
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  • Christmas Day - 25 December 2026 10% XMAS10
  • Boxing Day - 26 December 2026 10% BOXING10
  • New Year's Eve - 31 December 2026 8% NYE8

Brand Names

Also known as (by country):
CountryBrand Names
New Zealand
Diurin Frusid
Canada
Apo-Furosemide

FAQ

Furosemide is a prescription-only medicine in the United Kingdom and a prescription is required when buying it from local pharmacies. Our store policy allows you to order these tablets without a prescription and have them sent by mail.

A pill organiser may be practical for short-term use if it keeps the tablets dry, protected from light and clearly identifiable. The original tightly closed container is best for longer-term storage, as it provides the labelled protection from moisture and light.

The exact manufacturer for an individual order is not confirmed in the available product information. Check the manufacturer's name on the received outer carton or container label before use.

Tablets from another manufacturer may have the same active ingredient and strength, but their appearance and inactive ingredients can differ. Before continuing, check that the active ingredient is furosemide, the strength and dosage form match your medicine, and seek advice if you have had an allergy or reaction to a previous version.

Tablets can normally be transported by post when appropriately packed to protect them from light, moisture and physical damage. Their labelled storage temperature is 20 °C to 25 °C, with permitted excursions from 15 °C to 30 °C; check the packaging and tablets on arrival if conditions during transport are uncertain.

Furosemide can cause dizziness, light-headedness, blurred vision or a fall in blood pressure, particularly when treatment starts or the dose changes. Do not drive or operate machinery until you know how the tablets affect you.

Furosemide is a loop diuretic used to reduce oedema caused by conditions such as heart failure, liver disease or kidney disease. It is also used for high blood pressure, sometimes alongside other antihypertensive medicines.

Take the tablets by mouth with water exactly as prescribed. They are often taken in the morning because they increase urination; if more than one daily dose is prescribed, the timing should follow the prescriber's instructions to reduce disruption overnight.

Common effects include needing to pass urine more often, thirst, dizziness, headache and stomach upset. Furosemide can also cause dehydration or changes in potassium, sodium and other electrolytes, which may cause muscle cramps, weakness, confusion or an irregular heartbeat and require prompt medical attention.

Furosemide should generally be avoided during pregnancy unless there is a compelling medical reason, as it crosses the placenta and may affect fetal fluid and electrolyte balance. It is contraindicated while breastfeeding because it passes into breast milk and may inhibit milk production.

Description

What Is Lasix Used for?

Lasix (Furosemide), also known as a water pill, is a diuretic. It's frequently recommended to aid the body's urination of extra salt and water. It is sometimes used to treat illnesses including congestive heart failure, kidney issues, or high blood pressure to lessen edema and fluid retention. It boosts the body's excretion of water, salt, and chloride and raises urine production.

FUROSEMIDEHow the Medicine Looks Like

Tiny yellow or white tablets containing 20 or 40 milligrams of furosemide. Transparent liquid intended for intravenous injection.

Applications

Lasix causes the kidneys to produce more urine, lowering the body's water content. When this happens, blood pressure can be lowered, and water retention in the arms, legs, or lungs can be released. Additionally, Furosemide can aid in lowering blood calcium levels.

How to Take

Tablets should be taken with a small amount of water. Taking the tablets in the morning is recommended, followed by breakfast. If necessary, take your afternoon dosages by no later than 6 p.m.; if not, you might have to wake up in the middle of the night to use the restroom. You will receive an injection of Furosemide from your doctor or nurse.

Interactions

Interactions between Lasix and other drugs and substances may reduce its effectiveness or raise the possibility of adverse side effects. Here are a few typical interactions:

  1. Other Diuretics: Using diuretics simultaneously increases the risk of electrolyte imbalances and dehydration by having synergistic effects.
  2. Furosemide lessens the body's excretion of lithium, raising the body's lithium levels. Due to the potential for toxicity, lithium dosage adjustments may be necessary.
  3. Aminoglycoside Antibiotics: Lasix may raise the risk of ototoxicity (injury to the ears) and nephrotoxicity (damage to the kidneys) when used with aminoglycoside antibiotics (e.g., gentamicin).
  4. Nonsteroidal Anti-Inflammatory Drugs (NSAIDs): NSAIDs can lessen Furosemide's diuretic and antihypertensive effects. Kidney issues could also become more likely as a result of this interaction.
  5. Corticosteroids: Using corticosteroids concurrently can raise your risk of developing hypokalemia or low potassium levels.
  6. Digoxin: Furosemide may cause hypokalemia or other electrolyte imbalances, exacerbating digoxin's harmful effects on the heart.
  7. Antihypertensive Drugs: Furosemide and other antihypertensive drugs together may have a cumulative effect of decreasing blood pressure.
  8. A Few Anti-Diabetic Drugs: Furosemide may alter blood sugar levels and hinder certain anti-diabetic drugs' effects.
  9. Some Antiepileptic Drugs: The efficacy of certain antiepileptic medications may be diminished by Furosemide.

Before using Furosemide or any other new medication, it is important to inform your doctor about all the vitamins, over-the-counter medications, and prescriptions you are currently taking. This aids in evaluating possible interactions and modifying your treatment plan as necessary. Never change your drug schedule without first talking to your doctor.

Side Effects

Side Effects Prevention What You Should Do
More Common
Dizziness when getting up from a lying or sitting position Get up slowly Inform your doctor or nurse if this bothers you.
Less Common
Blurred vision   Avoid driving if your vision is blurred. Inform your doctor or nurse if this bothers you.
Rare
Easy bruising or bleeding. Black, tar-like stools. Use sharp objects with care. Use a soft toothbrush. Inform your doctor before going to the dentist. Call your doctor immediately if bleeding or bruising is unusual or will not stop, or contact the Emergency Department.
Yellow eyes or skin Your doctor will test your liver function Tell your doctor as soon as possible
Dark frothy urine
Joint pain, loss of balance Check with your doctor or nurse as soon as possible.
Ringing in ears, hearing loss
Skin rash Tell your doctor or nurse if this bothers you.
Signs of Low Potassium What You Should Do
Dry mouth, increase thirst Irregular heartbeat or weak pulse Eat potassium-rich foods
Muscle cramps/pain Unusual tiredness Contact your doctor if these symptoms persist or if they become severe.
Nausea and vomiting Your doctor may order a potassium medicine.

What the Patient Should Know

Potassium can be lost from the body when taking this medicine. You can raise the amount of potassium in your body by consuming foods high in potassium, like oranges, bananas, or orange juice, or by taking a potassium supplement (as directed by your physician). Your dietician can assist you in selecting alternative foods high in potassium.

When you wake up in the morning, you may feel lightheaded or dizzy. Sit or lie down, then gently get to your feet. Dizziness may worsen in hot weather conditions or after consuming alcohol. Try consuming fewer alcoholic beverages, and steer clear of prolonged standing or sun exposure.

Furosemide may increase your skin's sensitivity to sunlight. Avoid the sun as much as you can. Wear eyewear and protective clothes, and apply sunscreen cream with an SPF of 30 or higher.

Take the missed dose of this medication as soon as you remember. Don't give yourself two doses, though, if it's time for the next dose.

Keep this medication out of children's reach and in a cold, dry location.

For any details regarding this drug, kindly contact your physician or nurse.

Warnings

Certain circumstances or contraindications dictate when it should not be used. The following are some typical contraindications:

This medicine or any of its parts should not be used by anyone who has shown signs of hypersensitivity or allergic reaction.

Since Lasix depends on urine production to get rid of extra fluid, it is not recommended for people who have anuria.

Lasix can potentially induce electrolyte imbalances, specifically a reduction in potassium levels. People who suffer from severe electrolyte imbalances might have to avoid taking it.

Lasix should be taken cautiously if someone is extremely dehydrated since it may make the condition worse.

The medicine may raise uric acid levels, which may lead to an attack of gout. Those with a history of gout may require special attention or different medicine.

It's possible that Lasix is unsafe to use while nursing or pregnant. In these circumstances, it's crucial to speak with a healthcare professional.

Furosemide should be used cautiously and, in certain situations, should not be used at all by those with specific medical conditions, such as liver disease.

Before taking Furosemide or any other drug, people should make sure their healthcare provider is aware of all of their medical history and current prescriptions. A medical practitioner is the only one who can assess if Furosemide is appropriate given a patient's unique medical circumstances.

Lasix Overdose

Overdosing can have significant side effects and needs to be treated right away. An excess of Furosemide may cause symptoms such as dehydration, hypokalemia, low potassium levels, low blood pressure, fainting, dizziness, lightheadedness, and ototoxicity.

In the event that an individual suspects overdosing or encounters adverse severe effects following Lasix administration, prompt emergency medical treatment should be sought. Depending on the overdose intensity and the symptoms, a specific strategy will be chosen.

How to Keep Lasix

It should be kept at room temperature. Steer clear of the sun and extremely hot weather.

It should be stored dry. It is advisable to store medication in a container with a tight lid because moisture can alter the medication's stability.

If you have kids or pets at home, keep Lasix out of reach and in a childproof container to avoid unintentional ingestion. For future reference, preserve the drug information and any instructions or patient pamphlets that the pharmacist or healthcare provider may have provided.

Verify the medication's expiration date on the container. Furosemide should not be used after the expiration date as it might not work as intended and might even be dangerous.

Medically reviewed by
Jennifer Bowles
Pharmacologist
Updated 11 August 2026

Customer questions

Asked by Hannah Clarke, Derby, United Kingdom

I'm in Derby and my order now says it has been dispatched. Does that mean my furosemide tablets will arrive tomorrow?

Answered by Support team

Not necessarily. Dispatch means the order has left us; delivery depends on the delivery option selected and your location in Derby.

Asked by Oliver Bennett, Birmingham, United Kingdom

I live in Birmingham. Can I enter my postcode before paying to see whether delivery is available for these tablets?

Answered by Support team

Yes. Enter your Birmingham postcode at checkout to see the delivery options available for your address before you complete payment.

Asked by Niamh Gallagher, Lisburn, United Kingdom

I'm in Lisburn, Northern Ireland. Can I check whether furosemide tablets can be delivered to my address before I place the order?

Answered by Support team

Yes. Please enter your Lisburn postcode at checkout to check the delivery options presented for your address before payment.

Asked by James Wilson, Wolverhampton, United Kingdom

I keep my medicines in the original packs. Will these furosemide tablets definitely arrive in sealed manufacturer packaging?

Answered by Support team

We cannot guarantee the exact packaging arrangement before an order is received. Check the outer packaging, container or blister, label, lot number and expiry date on arrival, and do not use the tablets if their protective packaging appears compromised.

Asked by Sophie Patel, Reading, United Kingdom

I have chronic kidney disease and have been prescribed furosemide for ankle swelling. Does kidney disease affect how it is monitored?

Answered by Support team
Medical reviewed by Reynard Sparks

Yes. Furosemide is used for oedema associated with kidney disease, but the dose and response can vary, so kidney function, blood pressure, fluid balance and electrolytes may need monitoring. Your prescriber should determine the appropriate regimen for your kidney function and reason for treatment.

Product specifications

Active ingredientFurosemide
Drug classLoop diuretic
Dosage formTablets
Available strengths40 mg, 100 mg
RouteOral
StorageStore at 20°C to 25°C; excursions permitted to 15°C to 30°C. Protect from light and keep the container tightly closed.
ATC codeC03CA01

Regulatory information

United Kingdom: medicine status
Registration statusAvailable official records do not establish a current UK marketing authorisation for the named Lasix 40 mg or 100 mg pill presentations; the Lasix name and Sanofi reference alone are not evidence of UK registration or a UK marketing authorisation holder.
Prescription statusFurosemide is a prescription-only medicine (POM) in the United Kingdom.
NHS supply and chargesNHS supply and patient charges depend on the UK nation and exemption status; in England, a prescription charge may apply unless the patient is exempt.
Patient medicine informationThe NHS provides patient information on furosemide, including use, cautions, side effects and advice on taking it.
Safety monitoringSuspected adverse drug reactions should be reported through the MHRA Yellow Card Scheme.

More information