List of products in the National Drug Code with proprietary name . This medication is used with other medications to treat active tuberculosis (TB) of the lungs. It may also be used with another medication (isoniazid) to prevent active TB infections in people who are infected with the bacteria (people with positive TB skin test). Rifapentine is known as a rifamycin antibiotic. It works by stopping the growth of bacteria. This antibiotic treats only bacterial infections. It will not work for viral infections (such as common cold, flu). Using any antibiotic when it is not needed can cause it to not work for future infections.