A nurse is caring for a client who has active pulmonary tuberculosis (TB) and a new prescription for rifampin. The nurse should instruct the client that they should expect which of the following clinical manifestations while taking this medication?

A. Staining of teeth: Rifampin is not known to stain teeth. B. Orange colored secretions: Rifampin commonly causes orange discoloration of body fluids, including urine, tears, and sweat. This is harmless but can be alarming if the client is not forewarned. C. Constipation: Constipation is not a typical side effect of rifampin. D. White-colored stools: Rifampin does not cause white-colored stools, but bile duct obstruction could.