A nurse is caring for a client who has active pulmonary tuberculosis (TB). The client is a multiple drug regiment, for several months including Rifampin. What information should the nurse discuss with the client regarding the adverse effects of Rifampin?

A. The client might experience constipation.: Constipation is not a common side effect of rifampin which primarily affects liver function and body fluid coloration, not bowel motility, so constipation would likely be due to other factors rather than this medication. B. The client might see black-colored stools.: Rifampin does not cause black stools; black stools are more commonly associated with gastrointestinal bleeding or iron supplementation. The nurse should teach the client to report dark, tarry stools as they could indicate bleeding. C. The medication may stain the teeth.: Rifampin does not discolor teeth. Unlike drugs such as tetracyclines, which can cause permanent dental staining, rifampin primarily alters the color of body fluids but not enamel or oral structures. D. The client's urine might turn a red/orange color.: Rifampin commonly causes red-orange discoloration of body fluids, including urine, saliva, sweat, and tears. This is a harmless but expected effect of the drug, and clients should be informed beforehand to prevent alarm and avoid staining contact lenses or clothing.