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Rifaximin: Brands, Price & Uses in Bangladesh
Rifaximin is a gut-selective (minimally absorbed) antibiotic with evidence-based indications that vary in strength: Established / Approved Uses Traveler's diarrhea caused by noninvasive strains of…
About Rifaximin
Indications of Rifaximin
Rifaximin is a gut-selective (minimally absorbed) antibiotic with evidence-based indications that vary in strength:
Established / Approved Uses
- Traveler's diarrhea caused by noninvasive strains of Escherichia coli, in adults and children 12 years of age and older.
- Reduction in risk of recurrence of overt hepatic encephalopathy (HE) in adults, generally used together with lactulose rather than as monotherapy.
- Irritable bowel syndrome with diarrhea (IBS-D) in adults; repeat treatment courses may be given if symptoms recur.
Additional / Locally Recognized Use
- Small intestinal bacterial overgrowth (SIBO)-associated symptoms - commonly used in this setting in South Asian clinical practice, though this is not a core FDA-approved indication.
Rifaximin is not effective for diarrhea complicated by fever or blood in the stool, or diarrhea caused by pathogens other than E. coli; a physician should confirm the diagnosis before use.
Dosage & Administration of Rifaximin
Dosing by Indication
| Indication | Adult Dose | Duration |
|---|---|---|
| Traveler's diarrhea (age ≥12 years) | 200 mg by mouth 3 times daily | 3 days |
| Reduction of hepatic encephalopathy recurrence (age ≥18 years) | 550 mg by mouth 2 times daily | Long-term, as directed by physician (usually with lactulose) |
| IBS-D (age ≥18 years) | 550 mg by mouth 3 times daily | 14 days; up to 2 repeat courses may be given if symptoms recur |
| SIBO-associated symptoms (locally used, off-label) | 400 mg 3 times daily, or 550 mg 3 times daily | 10-14 days, per physician's advice |
Rifaximin tablets may be taken with or without food. Swallow tablets whole; do not crush or chew unless directed. Take exactly as prescribed by your physician; do not stop, extend, skip doses, or share this medicine with others without medical advice. If diarrhea symptoms worsen or persist beyond 24-48 hours, or if fever/blood in stool develop, contact a physician - a different antibiotic may be needed.
Side Effects of Rifaximin
Side effects of Rifaximin vary somewhat by indication.
Common
- Headache
- Nausea and abdominal pain
- Flatulence and constipation
- Peripheral edema, dizziness, and fatigue (more common in hepatic encephalopathy treatment)
- Mild elevation of liver enzymes (ALT)
Less Common / Serious
- Urinary tract infection (reported with long-term use in hepatic encephalopathy)
- Clostridioides difficile-associated diarrhea (CDAD) - as with other antibiotics, though the risk is lower given minimal systemic absorption
- Hypersensitivity reactions including anaphylaxis, angioedema, and exfoliative dermatitis (see Contraindications)
Seek prompt medical attention for signs of a severe allergic reaction, severe or persistent diarrhea, or unusual bruising/bleeding.
Contraindications of Rifaximin
Rifaximin is contraindicated in patients with known hypersensitivity to Rifaximin or to any rifamycin antimicrobial agent (e.g., rifampin, rifabutin), due to the risk of cross-reactivity. Reported hypersensitivity reactions have included anaphylaxis, angioedema, and exfoliative dermatitis.
Frequently Asked Questions about Rifaximin
What is Rifaximin used for?
Rifaximin is used to treat traveler's diarrhea caused by certain strains of E. coli, to reduce the risk of recurrent hepatic encephalopathy episodes, and to manage diarrhea-predominant irritable bowel syndrome (IBS-D).
Is Rifaximin absorbed into the bloodstream?
No, more than 99% of an oral dose of Rifaximin stays within the gastrointestinal tract, which is why it causes fewer systemic side effects than many other antibiotics.
Can I take Rifaximin during pregnancy?
Rifaximin should be used during pregnancy only if clearly needed and the potential benefit justifies the potential risk to the fetus, since animal studies have shown some risk and human data are limited. Always consult a physician before use in pregnancy.
Who should not take Rifaximin?
Rifaximin should not be taken by anyone with a known hypersensitivity to Rifaximin or to any rifamycin antibiotic (such as rifampin), due to the risk of a cross-reaction, including severe allergic reactions.
What should I do if my diarrhea gets worse while taking Rifaximin?
If diarrhea worsens or persists beyond 24-48 hours, or if you develop fever or blood in the stool while taking Rifaximin, contact your physician promptly, as this may indicate a different infection that needs alternative treatment.
Can children take Rifaximin?
Rifaximin is approved for traveler's diarrhea in children aged 12 years and older. Its safety and effectiveness for other uses, such as hepatic encephalopathy or IBS-D, have not been established in patients under 18 years.
Disclaimer
The information provided is accurate to the best of our knowledge, but it does not replace professional medical advice. We cannot guarantee its completeness or accuracy, and the absence of specific information about a drug should not be taken as an endorsement. We are not responsible for any consequences arising from this information, so please consult a healthcare professional for any concerns or questions.