Rifaximin

Rifaximin is a gut-selective (non-absorbable) antibiotic medicine available in Bangladesh under many brand names. Below are its uses, side effects and precautions — and every brand with its current price.

Rifaximin is prescribed for conditions where targeting gut bacteria helps, including:

• Irritable bowel syndrome with diarrhoea (IBS-D) in adults — a 14-day course can reduce bloating, loose stools and abdominal discomfort
• Prevention of hepatic encephalopathy in chronic liver disease — taken continuously to reduce ammonia-producing gut bacteria, often with lactulose
• Travellers' diarrhoea caused by non-invasive strains of E. coli
• Small intestinal bacterial overgrowth (SIBO), at the doctor's discretion

It is not suitable for diarrhoea with fever or blood in the stool, which suggests invasive infection needing different treatment. Use it only for the condition your doctor diagnosed.

Because so little Rifaximin enters the bloodstream, Rifaximin is one of the better-tolerated antibiotics. Possible side effects include:

• Nausea, bloating or constipation
• Headache, dizziness or tiredness
• Ankle swelling (peripheral oedema), mainly in liver-disease patients
• Muscle cramps or joint pain, occasionally

Seek medical help promptly if you develop an allergic rash, swelling of the face or throat, breathing difficulty, or severe watery diarrhoea during or after the course (a possible sign of C. difficile infection). If diarrhoea you were treating worsens, or fever or blood in the stool appears, stop relying on the medicine and see your doctor immediately.

Rifaximin is a prescription-only antibiotic. Even though it stays in the gut, misusing it still breeds resistant bacteria — and Bangladesh is already deep in an antibiotic-resistance crisis. Take it only for the condition your doctor diagnosed and complete the full prescribed course; stopping an IBS or encephalopathy course midway invites the problem straight back.

• Do not self-treat diarrhoea with Rifaximin: diarrhoea with fever or bloody stools needs medical evaluation, not this drug
• Tell your doctor if you have severe liver impairment — supervision is needed even though absorption is minimal
• Report severe or persistent diarrhoea during or after treatment
• If symptoms do not improve within the expected time, return to your doctor rather than extending the course yourself

Because Rifaximin barely enters the bloodstream, it has fewer interactions than most antibiotics — but a few matter. Tell your doctor about every medicine you take, especially:

• Ciclosporin and other strong P-glycoprotein inhibitors: these can raise rifaximin blood levels many-fold
• Warfarin: both increases and decreases in INR have been reported when starting or stopping rifaximin — extra INR checks are sensible
• Other antibiotics or long-term gut medicines: mention them so therapy can be sequenced properly

No clinically significant interaction is expected with food, and Rifaximin does not interfere with oral contraceptives in the way enzyme-inducing rifamycins (like rifampicin) do. Still, avoid adding any new medicine during the course without advice.

Do not take Rifaximin if you:

• Are allergic to rifaximin or any rifamycin antibiotic, such as rifampicin or rifabutin
• Have intestinal obstruction or suspected blockage of the bowel
• Have diarrhoea with high fever or blood in the stool — this needs urgent medical assessment, not gut-selective antibiotics

Use only under close medical supervision in severe (Child-Pugh C) liver impairment, although the drug is commonly used in liver disease. As always, give your doctor a full account of your allergies, bowel history and current symptoms before starting Rifaximin, so they can confirm it is the right and safe choice for you.

Pregnancy: Although very little Rifaximin is absorbed, animal studies have shown possible effects on the foetus, so Rifaximin should be avoided in pregnancy unless the doctor judges it clearly necessary. Tell your doctor if you are pregnant or planning a pregnancy before starting.

Breastfeeding: It is not known how much rifaximin reaches breast milk, but levels are expected to be very low because so little enters the mother's blood. A decision to use it while nursing should be made with your doctor, weighing the benefit of treatment against any possible risk to the baby. Report any feeding changes or diarrhoea in the infant.

Store Rifaximin below 30°C in a dry place, protected from direct sunlight and moisture. In Bangladesh's humid seasons, keep the strip inside its original carton in a cool cupboard — never in the bathroom or near the kitchen stove. Keep all medicines well out of the reach and sight of children.

• Do not transfer tablets to open containers; the original blister protects them from humidity
• Never use Rifaximin after the expiry date printed on the strip or carton
• Dispose of unused tablets through a pharmacy take-back rather than household waste or drains, to help limit antibiotic pollution and resistance