
Rifaximin


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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.
| Brand Name | Sibofix |
|---|---|
| Active Ingredient | Rifaximin |
| Drug Class | Antibiotic (specifically, a rifamycin-based, non-systemic antibiotic) |
| Available Forms | Tablet |
| Strengths | 200 mg and 550 mg (400 mg in some markets) |
| Routes of Administration | By mouth |
| Uses | Treatment of bacterial infections, primarily in the gastrointestinal system |
| Elimination Half-Life | 5.6 to 6 hours |
| Storage | 20 to 25°C or 68 to 77°F |
| Prescription Required | Yes |
| Manufacturer | Dr. Reddy's Laboratories Ltd |
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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.
Important Note: Individuals experiencing recurrent IBS-D symptoms can restart the treatment up to two times maximum.
Whether you take Sibofix for IBS-D or other gut bacterial infections, you must know the correct administration steps:
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.
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.
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.
| Category | Side Effect | Approx. Frequency (%) |
|---|---|---|
| Common (Clinical Trials) | Travelers’ diarrhea use | |
| Headache | 10% Xifaxan vs 9% placebo | |
| Common (Hepatic Encephalopathy trial) | Peripheral edema | 0.15 |
| Nausea | 0.14 | |
| Dizziness | 0.13 | |
| Fatigue | 0.12 | |
| Ascites | 0.11 | |
| Muscle spasms | 0.09 | |
| Pruritus (itching) | 0.09 | |
| Abdominal pain | 0.09 | |
| Anemia | 0.08 | |
| Depression | 0.07 | |
| Nasopharyngitis (cold symptoms) | 0.07 | |
| Arthralgia (joint pain) | 0.06 | |
| Dyspnea (shortness of breath) | 0.06 | |
| Pyrexia (fever) | 0.06 | |
| Rash | 0.05 | |
| Common (IBS‑D) | Nausea | ~3% |
| ALT increased | ~2% | |
| Serious/Postmarketing | C. 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 infection | Rare |
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Important Points:
Most people tolerate Sibofix well, but certain medical conditions and situations require caution to ensure safe use.
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.
| Feature | Xifaxan | Sibofix |
|---|---|---|
| Active Ingredient | Rifaximin | Rifaximin |
| Drug Class | Rifamycin Antibiotic (Non-systemic) | Rifamycin Antibiotic (Non-systemic) |
| Primary Manufacturer | Salix Pharmaceuticals (USA) | Dr. Reddy's Laboratories (India) |
| FDA Status | FDA-approved reference drug | Its active Ingredient is FDA-approved |
| Common Strengths | 200 mg, 550 mg | 200 mg, 400 mg, 550 mg |
| Availability | Primarily sold in the United States | Primarily sold in India & International markets |
| Mechanism | Inhibits bacterial RNA synthesis in the gut | Inhibits bacterial RNA synthesis in the gut |
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Sibofix has few clinically significant drug interactions due to minimal systemic absorption.
| Drug / Interaction | Effect/Recommendation |
|---|---|
| Warfarin | Rifaximin 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 antibiotics | Avoid combination unless prescribed; may increase risk of side effects or reduce efficacy. |
| Drug / Interaction | Effect/Recommendation |
| Warfarin | Rifaximin 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 antibiotics | Avoid combination unless prescribed; may increase risk of side effects or reduce efficacy. |
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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 Medicine | Use/Notes | Considerations |
|---|---|---|
| Neomycin | Used for Hepatic Encephalopathy in some patients | Systemic absorption can cause toxicity. Monitor renal function. |
| Lactulose | Used to prevent hepatic encephalopathy recurrence | Works 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. coli | It must be chosen based on local resistance and safety. |
| Probiotics/supportive therapy | Adjunct for gut microbiome support | It is not a substitute for antibiotics. |
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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 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.
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 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.
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