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Medicines ethambutol hydrochloride + isoniazid + pyrazinamide + rifampicinQuestion & answer

ethambutol hydrochloride + isoniazid + pyrazinamide + rifampicin · Medicine question

Why does it turn urine orange?

iatroX medicinesPublished 20 August 2026Reviewed 20 August 2026

The answer

Answer

Rifampicin colours urine and other body fluids orange-red. This is expected, but tears can permanently stain soft contact lenses.

Sources for this answer

Rimstar Film-coated Tablet / Voractiv Film-coated Tabletemc · SmPC Current selected SmPC · Version 11

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The full medicine guide

ethambutol hydrochloride + isoniazid + pyrazinamide + rifampicin

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Read the ethambutol hydrochloride + isoniazid + pyrazinamide + rifampicin guide

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