Medical Oncologist
CION Cancer Clinics
Water tablets for liver fluid: how spironolactone and furosemide work | CION Cancer Clinics
Spironolactone and furosemide are water tablets. They make the kidneys pass more salt, and water follows it out, slowly drawing down fluid in the abdomen from a scarred liver. They are often used together because they balance each other's effect on potassium. This page explains how each works, how the team keeps them safe, and which signs mean go to hospital today. At CION Cancer Clinics, our team supports patients and families through symptoms, follow-up and life during and after treatment.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed October 2026, next review due October 2027
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On this page
- How do spironolactone and furosemide clear fluid from the abdomen?
- What does each tablet actually do?
- How will the team check the tablets are working safely?
- Spironolactone and furosemide compared
- Four things families tell us about water tablets
- Who these tablets do not suit, and what this page cannot tell you
- Common questions about water tablets
The short answer
How do spironolactone and furosemide clear fluid from the abdomen?
Both are water tablets (diuretics). They make the kidneys pass more salt into the urine, and water follows the salt out of the body. Over days to weeks, that slowly draws down the fluid in the abdomen (ascites).
Which kind of fluid they help
They work best when the fluid comes from a scarred liver and raised pressure in the portal vein, the main vein into the liver. This is the fluid most people with liver cancer and cirrhosis live with. Fluid caused by cancer spreading over the lining of the abdomen responds much less well. Our page on the two kinds of ascites explains the difference.
Why the tablets and the diet go together
The tablets push salt out. Eating less salt stops it coming back in. Neither works well alone. Read why salt restriction matters before you decide the tablets are not working.
This page explains how the tablets work. Your doctor decides which ones you take and how much.The two tablets
What does each tablet actually do?
They act on different parts of the kidney, which is why doctors so often use them together.
Spironolactone
In liver disease the body makes too much of a hormone called aldosterone, which tells the kidneys to hold on to salt. Spironolactone blocks that signal. It works slowly, over several days, and it is usually the main tablet for liver fluid.
Things to know
- It keeps potassium in the body
- It can cause tender or swollen breasts, in men too
- Its full effect takes time to show
Furosemide
Furosemide works faster, on a different part of the kidney. You may notice more urine within hours. It is usually added to spironolactone rather than used alone for liver fluid.
Things to know
- It washes potassium out of the body
- It can cause cramps and dizziness on standing
- Too much can dry out the body and strain the kidneys
Why they are paired
One tablet keeps potassium in and the other lets it out, so together they tend to balance each other. Your doctor adjusts the pair together, guided by your weight and blood tests.
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Signs that need a doctor today
Go to hospital today if the person on water tablets becomes confused or very drowsy, passes very little urine, faints or is very dizzy, has muscle weakness or a racing or uneven heartbeat, or has fever or belly pain with the fluid. These can mean the salts in the blood or the kidneys have gone wrong, or that the fluid is infected. Do not wait for the next clinic visit.
Keeping it safe
How will the team check the tablets are working safely?
A weight every morning
Weigh at the same time, in similar clothes, after passing urine, and write it down. A slow steady fall is what the team wants. Our page on weighing yourself daily explains what the numbers mean.
Regular blood tests
Sodium, potassium and kidney function (creatinine) are checked often at the start and after every change. These tests decide whether the tablets go up, down or pause.
Changes are made by the team
The amount is raised in small steps if fluid keeps building, and lowered if the blood tests or kidneys object. This is normal, not a sign something has failed.
A plan for sick days
Vomiting, diarrhoea or eating and drinking very little can dry the body out fast on water tablets. Ask the team now what to do if this happens, so you are not guessing later.
Side by side
Spironolactone and furosemide compared
Spironolactone
Furosemide
Slow to start, gentle and steady
Quick to start, a stronger push
Potassium can rise too high
Potassium can fall too low
Breast tenderness or swelling
Cramps and dizziness on standing
Usually the main tablet for liver fluid
Usually added alongside, not alone
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Commonly believed
Four things families tell us about water tablets
"The tablets are damaging his kidneys, so we stopped them."
Water tablets can strain the kidneys if the amount is too high, which is why blood tests are checked. Stopping them at home can let fluid build fast. Call the team first, and see our page on kidney problems from treatment.
"More urine means he should drink lots more water."
Drinking extra water does not flush the fluid out. Most people do not need to restrict water either. Your team will tell you if the sodium level means you should.
"A painkiller from the medical shop is harmless."
Common painkillers like ibuprofen and diclofenac can harm the kidneys in liver disease and stop water tablets working. Ask before taking any painkiller.
"If the fluid comes back, the tablets have failed."
Often the amount needs adjusting, or salt has crept back into meals. When tablets truly stop working, other options exist. Read about refractory ascites.
Being straight with you
Who these tablets do not suit, and what this page cannot tell you
This page cannot tell you which tablet, how much, or when to change it. Those decisions depend on your blood tests, kidneys and weight, and they belong to your oncologist, hepatologist or physician. Never change the amount on your own.
Who these tablets do not suit
Water tablets may be paused or avoided when kidney function is falling fast, when sodium is very low, when potassium is dangerously high or low, or during an infection or a bleed. Some people's fluid does not respond even to the highest safe amount. For them, draining the fluid is usually the next step. Our page on draining the fluid explains what a tap involves.
What CION can help with
CION's team reviews the tablets alongside the cancer treatment and arranges blood tests. Drainage and specialist liver care are coordinated through partner hospitals and hepatologists.
Bring every tablet strip to each visit, including anything bought without a prescription.Questions we are asked
Common questions about water tablets
How long do water tablets take to work?
Furosemide increases urine within hours. Spironolactone is slower and builds up over several days. The fluid in the abdomen goes down gradually, not overnight. Your daily weight is the best guide. If it is not falling after the first couple of weeks, tell your team.
Why do I have to give blood so often?
The tablets change sodium, potassium and kidney function, and you cannot feel most of these changes until they are serious. The blood tests let the team adjust the tablets early and safely. They are most frequent at the start and after any change.
Can men take spironolactone if it causes breast swelling?
Many men do, and some find the tenderness settles. If it is troublesome, tell your doctor rather than stopping the tablet. There are other tablets that act in a similar way, and the doctor can decide whether one of them suits you better.
What should I do if I miss a tablet?
Do not take two together to make up for it. Take the next one as usual and note it in your weight diary. If you keep forgetting, a pill box or a phone reminder helps. Ask your pharmacist or doctor about your own tablets.
Are cramps a reason to stop?
Cramps are common, especially with furosemide, and can mean salts in the blood are off balance. Tell your team so they can check a blood test. Do not stop the tablets yourself. Sudden severe weakness or a racing heartbeat needs a doctor the same day.
Can I take these tablets during chemotherapy or immunotherapy?
Usually yes. Your oncologist sees the whole list of medicines and checks the kidneys and blood salts before each treatment. Vomiting or diarrhoea from cancer treatment can dry you out, so tell the team early if either starts.
Do I still need to cut salt if I take the tablets?
Yes. Salt restriction and the tablets work together. Eating a lot of salt can undo the tablets, and the amount may then need to go up. Our page on low-salt cooking shows how to keep food tasty.
Who should I call if I am worried?
For confusion, fainting, very little urine, fever or belly pain, go to hospital today. For questions about side effects or blood results, call your treating team. If you are unsure who to call, the CION helpline will point you to the right person.
Your Specialists
Meet CION's liver cancer specialists. Bring your scan reports and liver blood tests.
Our medical and surgical oncologists plan liver cancer care together, weighing the tumour and how well your liver works before choosing surgery, a liver-directed procedure or medicines.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
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Sources
- Merck Manual Consumer Version — Ascites
- MedlinePlus — Ascites
- NIDDK — Treatment for Cirrhosis - NIDDK
- Cleveland Clinic — Ascites: What it is, Symptoms, Causes & Treatment
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
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