Final answer:
Rifampin can cause yellow-orange discoloration of urine, sweat, and tears.
Step-by-step explanation:
Rifampin, an antibiotic used to treat tuberculosis, can cause a harmless and expected adverse effect of yellow-orange discoloration of urine, sweat, and tears. This is a common side effect of rifampin and occurs due to the drug's interaction with body fluids. It is important for the nurse to educate the client about this side effect so they are not alarmed.