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Product Details

Description: Sibofix (Rifaximin)

Description: Sibofix (Rifaximin)

Sibofix is a brand-name medication commonly prescribed for gut-related infections. This antibiotic contains Rifaximin as its active component, which is an FDA-approved rifamycin-class antibacterial agent used to treat specific bacterial infections. Lower doses (200 mg and 400 mg) are typically prescribed for traveler’s diarrhea, which is often caused by E. coli bacteria from contaminated food or water. Higher doses (550 mg) are used for more complex conditions such as hepatic encephalopathy, a liver-related brain disorder, and irritable bowel syndrome with diarrhea (IBS-D), which causes stomach discomfort and changes in bowel movements.

Quick Facts About Sibofix

Brand NameSibofix
Active IngredientRifaximin
Drug ClassAntibiotic (specifically, a rifamycin-based, non-systemic antibiotic)
Available FormsTablet
Strengths200 mg and 550 mg
(400 mg in some markets)
Routes of AdministrationBy mouth
UsesTreatment of bacterial infections, primarily in the gastrointestinal system
Elimination Half-Life5.6 to 6 hours
Storage20 to 25°C or 68 to 77°F
Prescription RequiredYes
ManufacturerDr. Reddy's Laboratories Ltd

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What Is Sibofix (Rifaximin) Approved For?

What Is Sibofix (Rifaximin) Approved For?

  • Treatment of Hepatic Encephalopathy
  • Treatment of Irritable Bowel Syndrome with Diarrhea
  • Treatment of Traveler's Diarrhea
Sibofix (Rifaximin) Dosage Guide

Sibofix (Rifaximin) Dosage Guide

The dosage for Sibofix gut bacteria treatment varies depending on the condition being treated. Here are brief dosage recommendations based on FDA-approved prescribing information. Always consult a medical expert before starting your treatment with this medication.

Sibofix Dosage for Travelers’ Diarrhea

  • Recommended Dose: 200 mg three times a day for 3 days, especially for diarrhea caused by noninvasive E. coli.

Sibofix Dosage for Hepatic Encephalopathy

  • Recommended Dose: 550 mg two times a day for 3 days. The dose may be continued as prescribed to reduce recurrent symptoms.

Sibofix Dosage for IBS-D

  • Recommended Dose: 550 mg three times a day for 14 days.

Important Note: Individuals experiencing recurrent IBS-D symptoms can restart the treatment up to two times maximum.

Pharmacist Tips: How to Take Sibofix (Rifaximin) Tablets

Pharmacist Tips: How to Take Sibofix (Rifaximin) Tablets

Whether you take Sibofix for IBS-D or other gut bacterial infections, you must know the correct administration steps:

  • Take medicine with or without food.
  • If a dose upsets your stomach, take it with food.
  • Swallow the tablet whole with a full glass of water.
  • Try to take your doses at the same time every day to keep stable drug levels.
  • Always complete your prescribed course duration, even if you begin to feel better.
  • Do not stop treatment suddenly, as it can allow the bacteria to return or become resistant to the drug.
  • Monitor for signs of C. difficile infection: persistent diarrhea, fever, or abdominal pain.
How Does Sibofix (Rifaximin) Work?

How Does Sibofix (Rifaximin) Work?

Sibofix contains Rifaximin, an antibiotic that mainly stays in the gut and targets harmful bacteria. It works by preventing bacteria from growing and multiplying in the gut that cause infections or digestive issues.

  • In Traveler’s Diarrhea, this gut bacteria treatment helps eliminate E. coli bacteria in the intestines, relieving diarrhea and stomach upset.
  • When you take Sibofix for Hepatic Encephalopathy, the medication reduces the number of gut bacteria that produce toxins like ammonia, which can affect brain function.
  • When you take Sibofix for IBS-D, Sibofix balances gut bacteria, which may reduce abdominal pain and improve bowel movements.

Because Rifaximin stays in the intestines and has minimal systemic absorption, it effectively targets gut-related issues with minimal impact on the rest of the body.

Possible Side Effects of Sibofix Tablets

Possible Side Effects of Sibofix Tablets

The FDA label for Xifaxan is being used as a reference because Sibofix contains the same active ingredient (Rifaximin). This label lists adverse reactions observed in clinical trials and postmarketing reports. These side effects are based on FDA-reviewed clinical data.

CategorySide EffectApprox. Frequency (%)
Common (Clinical Trials)Travelers’ diarrhea use
Headache10% Xifaxan vs 9% placebo
Common (Hepatic Encephalopathy trial)Peripheral edema0.15
Nausea0.14
Dizziness0.13
Fatigue0.12
Ascites0.11
Muscle spasms0.09
Pruritus (itching)0.09
Abdominal pain0.09
Anemia0.08
Depression0.07
Nasopharyngitis (cold symptoms)0.07
Arthralgia (joint pain)0.06
Dyspnea (shortness of breath)0.06
Pyrexia (fever)0.06
Rash0.05
Common (IBS‑D)Nausea~3%
ALT increased~2%
Serious/PostmarketingC. difficile‑associated diarrhea (CDAD)*Not quantifiable
Hypersensitivity reactions (incl. anaphylaxis)*Not quantifiable
Exfoliative dermatitis*Not quantifiable
Severe allergic reactions*Not quantifiable
Rare (General Antibiotic risks)Disruption of gut flora with secondary infectionRare

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Important Points:

  • Serious/Postmarketing side effects occurred after the drug was approved. There is no information on how often they happen because people report them voluntarily.
  • Rare effects occur infrequently and are often less than 1%.
  • Heart, breathing, or severe skin symptoms require immediate medical attention.
  • CDAD (Clostridium difficile infection) may occur during antibiotic therapy or weeks after discontinuation. Monitor any adverse symptoms.
Important Safety Information: Sibofix (Rifaximin) Risks and Warnings

Important Safety Information: Sibofix (Rifaximin) Risks and Warnings

Most people tolerate Sibofix well, but certain medical conditions and situations require caution to ensure safe use.

  • Before taking Sibofix for Hepatic Encephalopathy or other gut bacterial infections, tell your doctor if you have:
    • Liver disease
    • Severe gastrointestinal conditions, such as hepatic encephalopathy
    • History of C. difficile infection
  • High-risk groups should consult their doctor before using this medication. This includes:
    • Pregnant women
    • Breastfeeding mothers
    • Elderly patients
    • People with kidney impairment
  • Do not use Sibofix (Rifaximin) if you have:
    • A known allergy to rifaximin, rifamycin antibiotics, or any component of the tablet.
    • Systemic infections
  • Patients considering this gut bacteria treatment should regularly monitor liver function tests, particularly if they have liver disease.
  • If you notice signs of severe diarrhea, allergic reactions, or unusual fatigue, report them immediately to a doctor.
  • Do not use it for viral infections such as the common cold, as antibiotics are ineffective against viruses.
  • Avoid combining with other rifamycin antibiotics unless prescribed by a doctor.
  • Sibofix may disrupt the balance of beneficial gut bacteria, potentially causing diarrhea in some patients. Notify your doctor immediately if you develop severe or persistent diarrhea during treatment.
  • If bacteria survive antibiotic treatment, they may become less sensitive to antibiotics, making subsequent infections harder to treat. To reduce this risk, always complete the prescribed course of treatment, even if symptoms improve early.
  • Sibofix is not intended for children under 18 years of age, specifically for Hepatic Encephalopathy or IBS-D, and not for children under 12 years for Traveler’s Diarrhea.
Sibofix vs. Xifaxan Differences

Sibofix vs. Xifaxan Differences

Both Sibofix and Xifaxan contain the exact same active medicine, Rifaximin. They have a similar mechanism of action. The main difference between them lies in the manufacturer and the market in which they are sold.

Xifaxan is the original ‘brand-name’ version developed in the U.S. and was the first to receive FDA approval after clinical trials. At the same time, Sibofix is a leading brand-name version produced by a major pharmaceutical company in India. Always discuss with your doctor before switching gut bacteria treatments.

FeatureXifaxanSibofix
Active IngredientRifaximinRifaximin
Drug ClassRifamycin Antibiotic (Non-systemic)Rifamycin Antibiotic (Non-systemic)
Primary ManufacturerSalix Pharmaceuticals (USA)Dr. Reddy's Laboratories (India)
FDA StatusFDA-approved reference drugIts active Ingredient is FDA-approved
Common Strengths200 mg, 550 mg200 mg, 400 mg, 550 mg
AvailabilityPrimarily sold in the United StatesPrimarily sold in India & International markets
MechanismInhibits bacterial RNA synthesis in the gutInhibits bacterial RNA synthesis in the gut

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Sibofix (Rifaximin) Interactions: What Medicines Should Be Avoided?

Sibofix (Rifaximin) Interactions: What Medicines Should Be Avoided?

Sibofix has few clinically significant drug interactions due to minimal systemic absorption.

Drug / InteractionEffect/Recommendation
WarfarinRifaximin may affect INR and prothrombin time. Monitor closely and adjust dose if needed.
P-glycoprotein (P-gp) inhibitors (e.g., cyclosporine)Use caution with concurrent use, as it has the potential for altered drug absorption.
Other rifamycin antibioticsAvoid combination unless prescribed; may increase risk of side effects or reduce efficacy.
Drug / InteractionEffect/Recommendation
WarfarinRifaximin may affect INR and prothrombin time. Monitor closely and adjust dose if needed.
P-glycoprotein (P-gp) inhibitors (e.g., cyclosporine)Use caution with concurrent use, as it has the potential for altered drug absorption.
Other rifamycin antibioticsAvoid combination unless prescribed; may increase risk of side effects or reduce efficacy.

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Sibofix (Rifaximin) Alternatives Compared

Sibofix (Rifaximin) Alternatives Compared

Sibofix alternatives mainly depend on the condition being treated. It is best to talk to a healthcare professional before switching between your treatment options.

Alternative MedicineUse/NotesConsiderations
NeomycinUsed for Hepatic Encephalopathy in some patientsSystemic absorption can cause toxicity. Monitor renal function.
LactuloseUsed to prevent hepatic encephalopathy recurrenceWorks differently. It may cause bloating and diarrhea.
Other antibiotics for Traveler’s Diarrhea (e.g., ciprofloxacin, azithromycin)Can be used when diarrhea is caused by pathogens other than E. coliIt must be chosen based on local resistance and safety.
Probiotics/supportive therapyAdjunct for gut microbiome supportIt is not a substitute for antibiotics.

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Why Buy Sibofix Online from Polar Bear Meds?

Why Buy Sibofix Online from Polar Bear Meds?

Buying Sibofix through Polar Bear Meds helps you manage costs while maintaining quality and reliability. By ordering with us, you gain access to significantly lower prices and save up to 90% compared to many U.S. pharmacies. We work only with licensed Canadian pharmacies, allowing you to obtain genuine Sibofix at reduced rates. New customers can also receive an additional 10% off their first order. Apply the Sibofix coupon code "WELCOMEPB10" at checkout to make your first purchase more affordable.

Sibofix (Rifaximin) FAQs

Sibofix (Rifaximin) FAQs

Shipping Sibofix from Canada to the U.S.

Shipping Sibofix from Canada to the U.S.

Sibofix is dispensed from certified Canadian pharmacies and shipped directly to your U.S. address using secure and discreet packaging. The ordering process is straightforward, and deliveries are typically completed within 3-5 business days. If you need help placing your order or have questions about shipping, our support team is available at 1-888-779-2193.

Important Notice

Important Notice

Sibofix is a prescription-only medication and must be used under the supervision of a licensed healthcare professional. The information provided on this page is intended for educational purposes only and should not be considered a substitute for professional medical advice. Consult your doctor before starting treatment with Sibofix, and discuss potential side effects, risks, and possible drug interactions.

Dr. Jackson Miller

Medically Reviewed by Dr. Jackson Miller (M.D)

Dr. Jackson Miller is a board-certified medicine physician & hospitalist. He is a healthcare professional with a strong background in patient care. With years of experience and a patient-first approach, he believes the foundation of good health is a patient who feels informed and empowered. He contributes to medical content review, drawing on his background in clinical practice and patient education. He focuses on presenting health information in a clear, accurate, and accessible way to help readers make informed decisions. His work emphasizes clarity, evidence-based guidance, and understandable explanations of medical topics.

Find Dr. Jackson Miller on:LinkedIn

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