Drug interactions
Cimetidine + Phytoestrogens
Severity: Minor
Cimetidine and Phytoestrogens: minor interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Reduced gastric acidity might theoretically change the absorption of some phytoestrogen products. There is no meaningful clinical evidence of an effect.
What this interaction means in plain words
Cimetidine and Phytoestrogens have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Raised gastric pH may alter absorption of some supplements; the mechanism is not well established.
What to do
No action is required beyond awareness.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Cimetidine
- Cimetidine + Dofetilide Contraindicated
- Cimetidine + Fezolinetant Contraindicated
- Alfentanil + Cimetidine Major
- Atazanavir + Cimetidine Major
- Carmustine + Cimetidine Major
- Cimetidine + Citalopram Major
Frequently asked questions
Can I take Cimetidine with Phytoestrogens?
MediHelp rates the interaction as minor. Cimetidine and Phytoestrogens have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Reduced gastric acidity might theoretically change the absorption of some phytoestrogen products. There is no meaningful clinical evidence of an effect.
How serious is the interaction between Cimetidine and Phytoestrogens?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No action is required beyond awareness.
What other medicines interact with Cimetidine?
MediHelp also lists interactions of Cimetidine with, for example, Dofetilide, Fezolinetant, Alfentanil. The full list is on the Cimetidine page.
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