Xifaxan (Rifaximin) for Selected Digestive Conditions

Xifaxan contains rifaximin, a rifamycin antibiotic that acts mainly inside the gastrointestinal tract because very little is absorbed into the bloodstream. It is prescribed for selected conditions, including noninvasive traveler’s diarrhea caused by certain strains of Escherichia coli, irritable bowel syndrome with diarrhea (IBS-D), and reduction of recurrent overt hepatic encephalopathy in appropriate adults.

• Drug class: minimally absorbed rifamycin antibacterial.
• Uses: depend on diagnosis and the clinician-selected regimen.
• Important limit: it does not treat every cause of diarrhea or infection outside the gut.
• Urgent symptoms: fever, blood in stool, dehydration, or worsening confusion require medical assessment.

How does Xifaxan work?

Rifaximin binds bacterial RNA polymerase and inhibits bacterial RNA synthesis. In traveler’s diarrhea, this can reduce susceptible intestinal bacteria. In IBS-D, its role is related to changes in intestinal bacterial activity; in hepatic encephalopathy, it may reduce gut bacteria that produce ammonia. These conditions have different dosing schedules, so treatment must follow the exact prescription rather than a general antibiotic rule.

How should Xifaxan be taken?

Take Xifaxan with or without food as directed. Finish the prescribed course for the condition being treated, but do not restart, extend, or repeat it without the prescriber’s advice. Confirm the package strength before you buy Xifaxan 200 mg or buy Xifaxan 550 mg. Contact the clinic if a dose is missed; do not double a dose.

What side effects and warnings are important?

Nausea, abdominal pain, bloating, headache, dizziness, and changes in bowel habits can occur. Seek prompt medical advice for rash, facial swelling, trouble breathing, severe or persistent diarrhea, fever, blood or mucus in stool, or signs of dehydration. Antibiotics can rarely be associated with Clostridioides difficile-associated diarrhea, including after treatment ends. Traveler’s diarrhea with fever or bloody stools may need a different evaluation and should not be self-treated with rifaximin alone.

What interactions and precautions apply?

Tell the prescriber about all medicines, especially cyclosporine, warfarin, and other drugs that may be affected by intestinal or liver transport systems. Severe liver impairment may increase systemic exposure and requires clinical oversight. Do not use Xifaxan if you have a known allergy to rifaximin, rifampin, rifabutin, or another rifamycin unless a clinician has evaluated the risk.

What should I know before ordering Xifaxan?

Use an authorized pharmacy and verify that the diagnosis, prescription, strength, and expiry date are correct before you buy Xifaxan. Xifaxan price differs by strength, quantity, insurance coverage, and dispensing requirements. Comparing Xifaxan price should not replace a prescriber’s assessment of the cause of diarrhea or liver-related symptoms. A low Xifaxan price is not proof of authenticity; do not decide to buy Xifaxan from an unverified source.

Keep tablets in their original container at room temperature as labeled and away from children. This page is general educational information and does not replace individualized medical care.