The short answer
Kava deserves product-specific review with protriptyline, but a proven additive-sedation interaction is not established. Protriptyline is described as activating in its label.
What this answer covers
Oral Piper methysticum extract; different blends and other sedatives require separate review.
- Supplement or preparation
- Piper methysticum
- Medication ingredient
- protriptyline
The medicine label matters
Protriptyline’s label says sedative and tranquilizing properties are lacking. A sedative interaction with another antidepressant does not establish this one.
Kava guidance still warrants attention
NCCIH advises against kava with sedating substances. Review other medicines and the complete product rather than treating protriptyline itself as a proven sedative.
A driving study did not test this combination
One study found no driving impairment with its kava preparation compared with placebo. Oxazepam was given separately, so the result does not establish safe co-use with protriptyline.
Do not rely on a dose gap
The sources give no validated interval that prevents impairment. Avoid driving if affected and contact the prescriber about new sleepiness or confusion.
Evidence and practical considerations
Side effects & toxicity
Exact sedation claim remains insufficient; supplement precautions do not establish protriptyline as a sedative.
- Exact scope
- Oral Piper methysticum extract; different blends and other sedatives require separate review. with Exact oral protriptyline hydrochloride film-coated tablets. RxNorm IN8886 / PIN203199 hydrochloride tablets. Label describes activating properties and lack of sedative/tranquilizing properties; do not assume other tricyclic sedation applies.
- Medication form and route
- oral
- Timing or duration
- Source-specific single-dose, repeated-dose and observational exposures distinguished.
What remains uncertain
- No exact co-use trial; oxazepam was a separate comparator.
Factors that may matter: preparation and plant part; clinical indication; dose; other medicines; baseline alertness.
Read the supporting source summaries
Source 1: current product label
dailymed.nlm.nih.gov · Source check Sep 10, 2026
Population: People prescribed oral protriptyline.
Label describes activating properties and lack of sedative/tranquilizing properties. Cardiovascular, anticholinergic and MAOI precautions; no explicit serotonin syndrome or St John’s wort warning.
How this applies: RxNorm IN8886 / PIN203199 hydrochloride tablets. Label describes activating properties and lack of sedative/tranquilizing properties; do not assume other tricyclic sedation applies.
No universal supplement interval, event rate or preparation equivalence established.
Source 2: official guidance
nccih.nih.gov · Source check Sep 10, 2026
Population: People considering the specified supplement.
Advises against use with sedative substances. Kava may cause dizziness and has been linked to rare severe liver injury, including with different extraction methods.
How this applies: Preparation-specific original evidence; no untested antidepressant or route transfer.
Not a protriptyline study. Intrinsic liver risk does not establish added protriptyline hepatotoxicity; preparation and co-exposure vary.
Source 3: original human study
pubmed.ncbi.nlm.nih.gov · Source check Sep 10, 2026
Population: Twenty-two adults in a randomized crossover driving study.
Medicinal-dose kava did not significantly impair driving outcomes; oxazepam impaired some outcomes.
How this applies: Preparation-specific original evidence; no untested antidepressant or route transfer.
Not combined administration or evidence that all kava preparations lack impairment.
Research assessment: · Open full citations ↗
Review and change history
- Publication status
- Published research summary
- Clinical review
- Not yet recorded
| Date | Update |
|---|---|
| Article prepared | |
| Current exact available claims adjudicated using original captures and explicit identity and comparator limits. | |
| Research summary published |
Article revision: d9b2b5fcd799e5b6
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?
Use the checker to explore your other combinations. Ask a pharmacist to review the exact products, amounts and medical conditions in your complete list.
Open the interaction checkerInformation, not medical advice. Do not change prescribed treatment based on this guide.