| Member | Definition | Role |
|---|
| rifampin | A member of the class of rifamycins that is a a semisynthetic antibiotic derived from Amycolatopsis rifamycinica (previously known as Amycolatopsis mediterranei and Streptomyces mediterranei). | rifampicin zwitterion; rifampicin |
| rifamycin b | | rifamycin B |
| rifamycin sv | A member of the class of rifamycins that exhibits antibiotic and antitubercular properties. | rifamycin SV |
| rifapentine | | rifapentine |
| rifaximin | A semisynthetic member of the class of rifamycins and non-systemic gastrointestinal site-specific broad spectrum antibiotic. Used in the treatment of traveller's diarrhoea, hepatic encephalopathy and irritable bowel syndrome. | rifaximin |