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CION Cancer Clinics
Rifaximin and when it is added | CION Cancer Clinics
Rifaximin is usually added when liver-related confusion keeps coming back even though lactulose is taken properly. It is an antibiotic that stays almost entirely in the gut and lowers the bacteria that make ammonia. This page explains when doctors add it, why lactulose usually continues, what families should watch for at home and who it does not suit. 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
- Why would a doctor add rifaximin to lactulose?
- Which situations make a doctor reach for rifaximin?
- What happens once rifaximin is started?
- What do families need to know about rifaximin?
- What do families often misunderstand about rifaximin?
- Who rifaximin does not suit, and what this page cannot tell you
- Common questions about rifaximin
The short answer
Why would a doctor add rifaximin to lactulose?
Rifaximin is usually added when confusion from the liver keeps coming back even though lactulose is being taken properly. It is an antibiotic that stays almost entirely inside the gut, where it reduces the bacteria that make ammonia.
The confusion it treats is called hepatic encephalopathy. A liver damaged by cirrhosis or by cancer cannot clear waste made in the bowel, and that waste affects the brain. The person may sleep all day, forget simple things, become irritable or seem "stubborn". Families often think it is old age, depression or madness. It is none of these, and it is usually treatable and reversible.
It works with lactulose, not instead of it
For most people, lactulose stays the main medicine. Rifaximin is a second layer of protection on top. Stopping lactulose because rifaximin has started is a common mistake.
Rifaximin is mainly a medicine to stop the next episode. It is not the first thing given in an emergency.When it is added
Which situations make a doctor reach for rifaximin?
There is no single rule for every patient. These are the situations where doctors most often consider it.
Episodes keep returning
The person has had more than one episode of confusion despite taking lactulose every day. This is the situation where the evidence for adding rifaximin is strongest.
Lactulose cannot be taken well
Some people cannot manage enough lactulose because of bloating, nausea or diarrhoea. The doctor may add rifaximin so a gentler amount of lactulose is enough.
Admission after a serious episode
After a hospital stay for confusion, doctors often start rifaximin on discharge to lower the chance of coming back.
Before adding it, the team checks
- Was there an infection or bleed?
- Was the person constipated or dehydrated?
- Were sleeping tablets or painkillers involved?
Not usually after a first, clear episode
When a first episode had an obvious trigger that has been fixed, lactulose alone is often enough. Rifaximin is not needed by everyone.
Not sure whether this applies to you?
Ask an oncologist
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New confusion still means hospital today
Being on rifaximin does not make a new episode safe to watch at home. Go to hospital today if the person becomes newly confused, very drowsy, hard to wake or does not recognise family, or if confusion comes with fever, black stools, vomiting of blood or a painful swollen belly. These can mean bleeding or infection. If they cannot be woken properly, call an ambulance.
At home
What happens once rifaximin is started?
The doctor writes both medicines down
Ask for a written plan that lists lactulose and rifaximin together, with the amount of each. This page does not give amounts. Keep the plan on one updated medicine list.
Keep the lactulose going
Keep aiming for the soft, regular stools the doctor asked for. If the bowels slow down, the protection from rifaximin alone is weaker.
Take it regularly, not only when confused
Rifaximin prevents episodes by being taken every day. Skipping it on good days, or saving tablets to stretch a strip, defeats the purpose.
Watch for change, good or bad
Note sleep, memory, mood and handwriting in a small diary. Families often see the first sign of a new episode before the doctor does.
Review at follow-up
The doctor decides how long to continue it. Bring the diary and the empty strips so the review is based on what actually happened.
Practical points
What do families need to know about rifaximin?
- What kind of medicine
- An antibiotic that is hardly absorbed into the blood. Almost all of it stays in the bowel, where the ammonia is made.
- Side effects
- Most people notice little. Some have nausea, wind, bloating or tiredness. Tell the doctor about anything new.
- Diarrhoea that will not stop
- Rarely, any antibiotic can lead to a serious bowel infection. Watery diarrhoea many times a day, or with blood, fever or belly pain, needs a doctor the same day.
- Availability in India
- Rifaximin is prescribed and sold in India under several names. It costs more than lactulose, and the price varies by brand and pharmacy.
- Other medicines
- Tell every doctor the person sees that they take it, including during cancer treatment. Check with the pharmacist before adding anything new.
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Commonly believed
What do families often misunderstand about rifaximin?
"Now he is on the stronger medicine, we can stop the syrup."
Rifaximin is meant to work together with lactulose. Stopping the syrup removes half the protection, and constipation can quickly bring the confusion back.
"An antibiotic should only be taken for a few days."
For most infections that is true. Here the aim is different: keeping ammonia-making bacteria low over a long period. Your doctor will say how long, and it is often a long-term medicine.
"If confusion comes back on rifaximin, the medicine has failed."
It lowers the chance of episodes. It does not remove it. A new episode usually has a trigger, such as an infection, bleeding or constipation, and that trigger needs finding.
"Cutting out protein will help the tablets work."
The advice has changed. Most people need enough protein to keep their muscles, and muscle helps clear ammonia. See whether protein should be reduced.
Being straight with you
Who rifaximin does not suit, and what this page cannot tell you
This page cannot tell you whether your relative needs rifaximin, how much to take or for how long. Those decisions depend on how often the episodes happen, what triggered them and how the liver is doing. A hepatologist or the treating physician makes them.
Who this does not suit
Rifaximin does not suit someone who has never had liver-related confusion, or someone whose confusion has another cause, such as an infection, a stroke or a medicine. It does not replace hospital care in a severe episode. Anyone with a known allergy to it, or to related antibiotics, should tell the doctor. Evidence is also thinner for some groups, including people with very advanced liver failure.
When episodes keep coming
Repeated episodes despite both medicines can mean the liver is getting weaker. That may change the cancer plan, and the tumour board will weigh it. CION's oncologists coordinate with hepatologists through partner hospitals so both parts of care are planned together.
If you are unsure whether the medicines are working, bring the diary to the next visit.Questions we are asked
Common questions about rifaximin
Is rifaximin a strong antibiotic?
It is unusual rather than strong. Very little reaches the bloodstream, so it acts almost only inside the bowel. That is why it can be taken for a long time with few side effects. It is not used for chest, urine or blood infections.
Can rifaximin be taken without lactulose?
Sometimes a doctor uses it alone, for example when lactulose truly cannot be tolerated. For most people the two are taken together, and the evidence is strongest for that combination. Do not stop either medicine on your own.
How long before it starts helping?
It is a preventive medicine, so the benefit is fewer episodes over the following weeks and months rather than a quick change. If the person is confused now, they need assessment and treatment of the current episode, not just a new tablet.
Is it safe with chemotherapy or immunotherapy?
It is often taken during cancer treatment. Some cancer medicines cause diarrhoea, which can be confused with a side effect or an infection. Tell the oncologist about every medicine and report new diarrhoea early, so the cause can be checked.
The tablets are costly. Can we skip some days?
Please do not skip doses quietly. Tell the doctor about the cost instead. There may be lower-priced brands, and the team can explain whether a scheme you are covered by may help. A hospital stay for a new episode costs far more.
What should we do if he gets loose motions on it?
First check whether lactulose is causing it, because that amount may need adjusting. If the diarrhoea is watery and frequent, bloody, or comes with fever or belly pain, see a doctor the same day. Keep up fluids meanwhile.
Will he need it for life?
Many people stay on it for a long time, because the liver problem behind the confusion usually remains. Some stop if the liver improves or the trigger is removed. The doctor decides this at follow-up, based on how the person has been.
Who should we speak to about it?
The hepatologist or physician who prescribed it is the right person for dose and duration questions. If the person is also having cancer treatment at CION, the helpline can connect you with the team so both plans fit together.
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.
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Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
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Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
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Sources
- Liver UK (formerly British Liver Trust) — Hepatic encephalopathy (HE)
- Merck Manual Consumer Version — Hepatic Encephalopathy
- MedlinePlus — Loss of brain function - liver disease
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.
Keep reading
Related pages
Lactulose: how it works and how to take itThe main medicine rifaximin is added toWhat triggers an episodeThe causes to look for when confusion returnsWhen confusion needs hospital admissionThe signs that mean going in todayMinimal encephalopathy: the kind nobody noticesSubtle changes families may be missing
Talk to us
Do the confusion episodes keep returning?
Our oncologists can look at the liver, the medicines and the cancer plan together, and coordinate with a hepatologist where needed. One helpline serves every CION centre.