potassium citrate · Medicine question

Why should Cystopurin (potassium citrate) not be used with methenamine?

Name: Why should Cystopurin (potassium citrate) not be used with methenamine?
Published: 2026-11-08T02:00:34.899Z

iatroX medicinesPublished 8 November 2026

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Cystopurin (potassium citrate) should not be used with methenamine because citrates alkalinise urine and diminish methenamine’s antibacterial activity.

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Cystopurin 3g granules for oral solutionBayer plc · emc · SmPC §4.5 Interaction with other medicinal products · Version 1Document updated 29 March 2023
Potassium Citrate MixtureThornton & Ross Ltd · emc · SmPC §4.5 Interaction with other medicinal products · Version 5

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