cimetidine · Medicine question

How can cimetidine affect warfarin levels?

iatroX medicinesPublished 8 November 2026

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Cimetidine may increase warfarin plasma levels by inhibiting certain cytochrome P450 enzymes; close monitoring is recommended, and warfarin dosage reduction may be necessary.

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Cimetidine 200mg/5ml Oral SolutionRosemont Pharmaceuticals Limited · emc · SmPC §4.5 Interaction with other medicinal products · Version 9Document updated 12 August 2020

Sources checked 8 November 2026

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