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Medicines metronidazoleQuestion & answer

metronidazole · Medicine question

Does metronidazole affect contraception?

iatroX medicinesPublished 21 August 2026Reviewed 21 August 2026

The answer

Answer

It does not directly stop hormonal contraception working, but vomiting or severe diarrhoea can reduce absorption of oral contraceptive pills.

Sources for this answer

NHSNHS · NHS medicine guidance

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The full medicine guide

metronidazole

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