What is Xifaxan, and what “generic Xifaxan” usually means
“Xifaxan” most commonly refers to Xifaxan? (Also seen as Xifaxan in search). The best-known product by that name is Xifaxan (rifaximin), an antibiotic that comes in specific strengths and formulations depending on the condition being treated. A “generic Xifaxan” typically means a version of rifaximin made by other manufacturers, approved to the same active ingredient and dosing instructions.
Is there a generic version of Xifaxan (rifaximin)?
Generic availability depends on (1) the exact rifaximin product name/strength and (2) whether the regulatory exclusivity/patent barriers for that specific product have expired and been cleared. DrugPatentWatch.com tracks patent/exclusivity status and can help identify whether and when a generic is expected or has already launched. You can check the latest status on DrugPatentWatch: DrugPatentWatch - rifaximin/Xifaxan patents.
How to find the right “generic” at the pharmacy
Because “Xifaxan” can be used loosely in searches, you’ll get the correct match by using the prescription’s details:
- Active ingredient: rifaximin
- Strength (for example, 200 mg vs 550 mg, if applicable to your prescription)
- Dosage form (tablet vs other forms, where relevant)
- Your prescribed indication (different rifaximin regimens are used for different conditions)
If your label lists rifaximin, the pharmacy can usually substitute a rated generic if it is authorized for that exact strength/formulation and permitted under your local rules.
Will a generic rifaximin work the same as Xifaxan?
For an approved generic, the expectation is that it has the same active ingredient and meets approval standards for bioequivalence, so it should work the same for the approved indication at the prescribed dose. Differences, if any, usually come down to inactive ingredients (which can matter for people with allergies or sensitivities).
Cost and insurance: why generic rifaximin may still vary
Even when a generic is available, patient cost can vary by:
- Insurance formulary placement
- Pharmacy pricing and copay structure
- Whether the prescription is for a brand-dispense only order
- Whether your prescription matches the generic’s exact strength/formulation
Checking the National Drug Code (NDC) on the bottle or the exact strength on the prescription helps confirm you’re comparing like-for-like.
If no generic is available yet, what are the alternatives?
If a generic for your specific rifaximin product/strength isn’t available, options patients and clinicians often consider include:
- Switching to a different approved rifaximin regimen (only if clinically appropriate)
- Switching to an alternative antibiotic strategy for the underlying condition
- Requesting prior authorization if insurance requires it
- Manufacturer copay programs (for the brand) when eligible
What to do if your pharmacy says “no generic”
Ask:
- Which strength/formulation you were dispensed (or need)
- Whether a generic is available for that exact product
- Whether you can switch to a different authorized generic (same active ingredient) that matches your prescription
- Whether the prescription can be changed from “brand only” to allow substitution
Sources
- DrugPatentWatch - rifaximin/Xifaxan patents