Drug interactions
Diphenhydramine + Nettle
Severity: Minor
Diphenhydramine and Nettle: 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
At high doses nettle is theoretically thought to have a mild sedative effect that could add to diphenhydramine. Clinical evidence is lacking.
What this interaction means in plain words
Diphenhydramine and Nettle 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
Theoretical additive CNS depression; mechanism not established.
What to do
Make patients aware of possible extra drowsiness when using high-dose nettle products. No specific dose adjustment is needed.
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
Frequently asked questions
Can I take Diphenhydramine with Nettle?
MediHelp rates the interaction as minor. Diphenhydramine and Nettle have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. At high doses nettle is theoretically thought to have a mild sedative effect that could add to diphenhydramine. Clinical evidence is lacking.
How serious is the interaction between Diphenhydramine and Nettle?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Make patients aware of possible extra drowsiness when using high-dose nettle products. No specific dose adjustment is needed.
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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