Drug interactions
Diphenhydramine + Ospemifene
Severity: Minor
Diphenhydramine and Ospemifene: 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
A protein-binding displacement interaction is proposed, but there is no good evidence it is clinically meaningful. Diphenhydramine is not highly protein-bound in a way that would significantly shift ospemifene exposure.
What this interaction means in plain words
Diphenhydramine and Ospemifene have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Diphenhydramine belongs to Respiratory; Ospemifene belongs to Endocrine.
Why it happens
Theoretical plasma protein binding competition; not shown to be clinically relevant.
What to do
No dose adjustment is needed. Routine clinical monitoring is sufficient.
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 Diphenhydramine
Other interactions of Ospemifene
- Bazedoxifene-conjugated estrogens + Ospemifene Contraindicated
- Estradiol + Ospemifene Contraindicated
- Clomiphene + Ospemifene Major
- Fluconazole + Ospemifene Major
- Ketoconazole + Ospemifene Major
- Ospemifene + Raloxifene Major
Frequently asked questions
Can I take Diphenhydramine with Ospemifene?
MediHelp rates the interaction as minor. Diphenhydramine and Ospemifene have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. A protein-binding displacement interaction is proposed, but there is no good evidence it is clinically meaningful. Diphenhydramine is not highly protein-bound in a way that would significantly shift ospemifene exposure.
How serious is the interaction between Diphenhydramine and Ospemifene?
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 dose adjustment is needed. Routine clinical monitoring is sufficient.
What other medicines interact with Diphenhydramine?
MediHelp also lists interactions of Diphenhydramine with, for example, Alfentanil, Belladonna and opium, Benzhydrocodone / acetaminophen. The full list is on the Diphenhydramine page.
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