Please consult your physician before taking any medication. Brand name: Rifater Generic ingredients: Rifampin, Isoniazid, Pyrazinamide Why is Rifater prescribed? Rifater is a combination antibiotic used to treat the initial phase of tuberculosis. After a 2-month period, your doctor may prescribe another combination of antituberculosis drugs. Rifater may also be used for purposes other than those listed in this medication guide.