The short answer
German chamomile may add to valproate-related sleepiness, but this specific interaction has not been demonstrated in a human study. The concern is theoretical and depends on the preparation.
What this answer covers
Matricaria chamomilla species entry; oral German chamomile tea and extracts are distinct preparations. Roman chamomile and topical use are not equivalent.
- Supplement or preparation
- Matricaria chamomilla
- Medication ingredient
- valproate
Why sleepiness is considered
Valproate can cause drowsiness and slower thinking, particularly with other sedating substances. NCCIH describes chamomile interactions with sedatives as theoretical. Together these support caution about extra impairment, without showing how often it occurs.
What a small trial found
A trial in 34 adults tested a standardized German chamomile flowering-top extract for 28 days. It found no significant sleep benefit or adverse-event difference versus placebo. It did not test a valproate interaction, so its results neither confirm added sedation nor establish combination safety.
Which product matters
Matricaria chamomilla and Matricaria recutita are names used for German chamomile. The trial used an ethanol/water extract. A cup of tea, a different extract, and a blend with other sleep ingredients may give different exposures; Roman chamomile is a separate botanical.
Practical review
Review the exact oral product with your prescriber or pharmacist before adding it for sleep. Report new excessive sleepiness, confusion or unsteadiness. Avoid driving while impaired. No protective spacing interval or valproate dose change has been established for chamomile.
Evidence and practical considerations
Side effects & toxicity
Retain only as an indirect theoretical added-sedation precaution, not a demonstrated pair-specific CNS depression outcome.
- Exact scope
- Matricaria chamomilla species entry; oral German chamomile tea and extracts are distinct preparations. Roman chamomile and topical use are not equivalent. with Oral valproate active moiety (RxNorm 40254 IN), with formulation boundaries preserved.
- Medication form and route
- oral valproate; oral supplement
What remains uncertain
- Evidence does not quantify all-product interaction risk; source-specific limits apply.
Factors that may matter: Indication; Exact preparation; Other sedating medicines.
Read the supporting source summaries
Source 1: current product label
dailymed.nlm.nih.gov · Source check Sep 10, 2026
Population: People prescribed oral valproic acid; valproate somnolence trial in elderly dementia patients.
Valproate may impair alertness, especially with other CNS depressants. Older adults may have more somnolence. Major metabolic pathways are glucuronidation and beta-oxidation; CYP oxidation is relatively minor. Serious liver injury is an intrinsic risk.
How this applies: Explicit oral active-moiety bridge to RxNorm IN 40254 valproate; no dose conversion or intravenous extrapolation.
No named interaction with the seven supplements. Active-moiety relevance does not establish identical kinetics or dosing for every valproate formulation.
Source 2: federal supplement safety guidance
nccih.nih.gov · Source check Sep 10, 2026
Population: Users of the specified supplement.
German chamomile names include Matricaria recutita and Matricaria chamomilla; possible interactions with sedatives are theoretical.
How this applies: Supplement-only guidance interpreted alongside the medication label.
Does not quantify a valproate interaction or establish protective dose spacing.
Source 3: original human randomized study
pubmed.ncbi.nlm.nih.gov · Source check Sep 10, 2026
Population: 34 adults with primary insomnia.
No significant improvement in primary sleep outcomes or difference in adverse events; events mild and transient.
How this applies: Applies only to the stated preparation, population and measured endpoints.
Excluded lifetime psychotic disorder and current hypnotic medicines. No valproate comparison; small sample and a single extract.
Research assessment: · Open full citations ↗
Review and change history
- Publication status
- Published research summary
- Clinical review
- Not yet recorded
| Date | Update |
|---|---|
| Article prepared | |
| Prepared article with direct-study limits, preparation boundaries and claim-specific conclusions. | |
| Research summary published |
Article revision: bcd458e89e2a3383
This guide brings together the evidence records used by our interaction checker. Each finding retains its own preparation limits, research date, and source summaries.
Full citations require verification. Reading this answer and the source summaries does not.
Taking other supplements or medications?
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Open the interaction checkerInformation, not medical advice. Do not change prescribed treatment based on this guide.