Answer
Rifampicin and its metabolites colour urine and other body fluids. This is expected and usually harmless, although blood in the urine requires assessment.
Sources for this answer
- NHSNHS · NHS medicine guidance
- Rifinah 300mg/150mg Tablets — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.