Answer
No. They are related rifamycin antibiotics but are distinct medicines. Allergy to rifampicin or another rifamycin may mean rifaximin is unsuitable.
Sources for this answer
- Rifaximin 550 mg film-coated tablets — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.