Xifaxan (Rifaximin) — Uses, Dosage, Side Effects & Safety

Drug class: Antibiotic (Rifamycin derivative)

Overview

Xifaxan (rifaximin) is an oral antibiotic used to treat certain gastrointestinal infections. It is most commonly prescribed for travelers’ diarrhea caused by non-invasive strains of Escherichia coli, hepatic encephalopathy (to reduce the risk of recurrence), and irritable bowel syndrome with diarrhea (IBS-D) in adults. Xifaxan works by stopping the growth of bacteria in the gut. Unlike many antibiotics, it is minimally absorbed into the bloodstream, so its effects are mostly limited to the intestines. This makes it effective for gut-related infections while reducing the risk of systemic side effects. Key points for patients: Take Xifaxan exactly as prescribed, complete the full course even if you feel better, and inform your doctor if you have liver disease or are pregnant. Do not use Xifaxan for infections outside the gut, as it is not effective for systemic infections.

Therapeutic uses

  • Traveler's diarrhea
  • Irritable bowel syndrome with diarrhea (IBS-D)
  • Hepatic encephalopathy
  • Clostridioides difficile infection (off-label)

Common side effects

  • Peripheral edema
  • Nausea
  • Dizziness
  • Fatigue
  • Ascites
  • Clostridium difficile-associated diarrhea
  • Angioedema

Frequently Asked Questions about Xifaxan

What conditions does Xifaxan treat?

Xifaxan is used to treat travelers’ diarrhea caused by non-invasive E. coli, reduce the risk of hepatic encephalopathy recurrence, and manage irritable bowel syndrome with diarrhea (IBS-D) in adults.

How quickly does Xifaxan work?

For travelers’ diarrhea, improvement is often seen within 24–48 hours. For IBS-D and hepatic encephalopathy, symptom improvement may take several days.

Can I drink alcohol while taking Xifaxan?

Alcohol does not directly interact with Xifaxan, but it is best to avoid alcohol if you have liver disease or as advised by your doctor.

Is Xifaxan safe during pregnancy or breastfeeding?

Safety in pregnancy and breastfeeding is not well established. Use only if clearly needed and prescribed by your doctor.

Does Xifaxan cause yeast infections or C. difficile?

Xifaxan may rarely cause C. difficile-associated diarrhea. Yeast infections are uncommon due to its minimal systemic absorption.

Can Xifaxan be used for other types of infections?

No, Xifaxan is not effective for systemic or non-gut infections. It should only be used for approved gastrointestinal indications.

What should I do if I develop a rash or allergic reaction?

Stop taking Xifaxan and seek immediate medical attention if you develop a rash, swelling, or difficulty breathing.

Related Xifaxan information

Educational information only. Always consult a qualified healthcare professional before starting, stopping, or changing any medication.