Rifampicin, also known as rifampin, is an antibiotic used to treat a several types of bacterial infections. This includes tuberculosis, leprosy, and Legionnaire's disease. It is almost always used along with other antibiotics, except when given to prevent Haemophilus influenzae type b and meningococcal disease in those who have been exposed to those bacteria. Before treating someone for a long period of time, measurement of liver enzymes and blood counts are recommended. It can be given either by mouth or intravenously.