A nurse is caring for a client who has tuberculosis and is taking rifampin. The client reports that her saliva has turned red-orange in color. Which of the following responses should the nurse make?

A. "You will need to increase your fluid intake to resolve this problem.": Increasing fluid intake does not prevent or reverse the red-orange discoloration caused by rifampin. While hydration is important for overall health and kidney function, it does not address this expected side effect. B. "Your provider will prescribe a different medication regimen.": A change in medication is not necessary for red-orange discoloration, as it is a harmless, expected effect of rifampin. Altering the regimen without indication could compromise tuberculosis treatment efficacy. C. "This finding may indicate possible medication toxicity.": Red-orange discoloration of bodily fluids is not a sign of toxicity. Rifampin normally causes this harmless color change, and toxicity would present with other symptoms such as hepatotoxicity or jaundice. D. "This is an expected adverse effect of this medication.": Rifampin commonly causes harmless red-orange discoloration of urine, sweat, saliva, and tears. Educating the client that this is expected helps reduce anxiety and reinforces adherence to the prescribed treatment regimen.