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. of the following responses should the nurse make?

Rationale: A. "This is an expected adverse effect of this medication.": Rifampin commonly causes harmless red-orange discoloration of body fluids, including urine, saliva, sweat, and tears. This effect occurs because rifampin is a highly pigmented antibiotic that is metabolized and excreted in these fluids. Clients should be reassured that this change is not harmful. B. "You will need to increase your fluid intake to resolve this problem.": Increasing fluid intake will not alter the red-orange discoloration caused by rifampin. Hydration is generally encouraged for overall health and to support renal clearance of medications, but it does not prevent or reverse this harmless pigment change. C. "Your provider will prescribe a different medication regimen.": A change in medication is unnecessary solely because of red-orange saliva. Rifampin remains effective in treating tuberculosis, and the discoloration is an anticipated effect rather than a reason to discontinue therapy. Altering the regimen could compromise treatment efficacy. D. "This finding may indicate possible medication toxicity.": Red-orange discoloration of body fluids is not a sign of rifampin toxicity. Toxicity is more likely to manifest with hepatotoxicity (elevated liver enzymes, jaundice, fatigue) or other systemic adverse effects. Reassurance and education are appropriate rather than initiating concerns about toxicity.