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Medicines methylthioninium chlorideQuestion & answer

methylthioninium chloride · Medicine question

Why can urine become blue-green?

iatroX medicinesPublished 21 August 2026Reviewed 21 August 2026

The answer

Answer

The medicine and its metabolites are strongly coloured and are eliminated mainly in urine. Temporary blue-green urine is expected.

Sources for this answer

Methylthioninium chloride Proveblue 5 mg/ml solution for injectionemc · SmPC Current selected SmPC · Version 11

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methylthioninium chloride

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