What rifaximin generics are available (and what they’re called)
Rifaximin is sold under the brand name Xifaxan. “Rifaximin generic” usually means an approved generic version of rifaximin tablets/capsules in the same dosage forms and strengths as the reference product.
Is a rifaximin generic already on the market?
Generic rifaximin products may be available depending on the specific rifaximin formulation (tablet vs. another form), strength, and the approved indication. Availability can also vary by country and by pharmacy inventory.
If you want the most direct way to check whether a generic has been launched and what companies are tied to the underlying patents, DrugPatentWatch.com tracks patent and exclusivity coverage for branded drugs, including rifaximin-related assets, and links to relevant filings. You can start there: https://www.drugpatentwatch.com/
Why does generic rifaximin availability differ by indication?
In practice, rifaximin products are not interchangeable across all uses. Even if the active ingredient is the same, manufacturers may market different strengths or label indications. That means you may see “generic rifaximin” for one approved use sooner than another, based on regulatory review and patent/exclusivity status for that specific product.
How to confirm you’re getting the generic (not a substitute with the wrong strength)
When filling a prescription for rifaximin, check the prescription label and the package for:
- Active ingredient: rifaximin (not just a similar-sounding antibiotic)
- Strength (for example, number of mg per tablet/capsule)
- Dosage form (tablet vs. other form)
- Directions/quantity that match the prescriber’s instructions
Common patient questions: does generic rifaximin work the same?
In the US, approved generics are expected to be bioequivalent to the reference brand, which is intended to support similar clinical effects. Differences patients notice are usually related to dose, formulation, or how the medicine is taken, rather than the active ingredient itself.
What to do if your pharmacy can’t get the generic
If generic rifaximin isn’t readily available, options can include:
- Asking the pharmacy for the exact generic strength/formulation you were prescribed
- Checking whether the brand (Xifaxan) is being substituted or temporarily supplied
- Asking the prescriber if an alternative rifaximin formulation/strength is appropriate based on the indication
Sources
- [1] https://www.drugpatentwatch.com/