The short answer
Kratom may add to trihexyphenidyl-related drowsiness, dizziness or confusion. Its effects vary with the product, and no exact-pair human study established how much risk increases.
What this answer covers
Mitragyna speciosa leaf-derived tea or extracts; alkaloid concentrations and other ingredients vary.
- Supplement or preparation
- Mitragyna speciosa
- Medication ingredient
- trihexyphenidyl
Both products can affect mental function
Trihexyphenidyl can cause drowsiness and confusion. Federal kratom information describes both stimulant-like and opioid/sedative-like effects, including dizziness or drowsiness. This supports a conditional alertness precaution.
The human interaction study used other medicines
A small study of kratom tea found increased midazolam exposure but unchanged dextromethorphan exposure. It did not measure trihexyphenidyl or establish this pair’s sedation risk, so those results cannot be assigned to trihexyphenidyl.
A stronger extract is a different exposure
Leaf tea and concentrated alkaloid extracts are not interchangeable. Other sedatives and the person’s baseline mental state can change the practical concern. Neither a safe kratom dose nor a predictable blood-level change for trihexyphenidyl was established.
Review before adding kratom
Discuss the exact product with the prescriber. Do not drive while dizzy or drowsy, and seek urgent help for marked confusion or inability to wake. A short spacing interval is not an established way to prevent overlapping effects.
Evidence and practical considerations
Side effects & toxicity
Conditional additive-alertness concern from exact medicine effects and kratom guidance. No measured pair PK/sedation rate; other-drug probe effects are not transferred.
- Exact scope
- Mitragyna speciosa leaf-derived tea or extracts; alkaloid concentrations and other ingredients vary. with Oral trihexyphenidyl hydrochloride tablets.
- Medication form and route
- oral medication; oral supplement
What remains uncertain
- No unmeasured pair incidence, blanket class transfer or arbitrary spacing interval.
Factors that may matter: Preparation; Dose; Other medicines; Organ function.
Read the supporting source summaries
Source 1: current product label
dailymed.nlm.nih.gov · Source check Sep 10, 2026
Population: People prescribed trihexyphenidyl
Atropine-like effects, drowsiness, confusion, constipation and urinary retention; glaucoma and obstruction precautions.
How this applies: Exact trihexyphenidyl RxCUI 10811 IN, with stated salt/formulation/route bridge.
No exact supplement-combination incidence or validated protective spacing; salt, route and release form limits apply.
Source 2: federal supplement safety guidance
nccih.nih.gov · Source check Sep 10, 2026
Population: Users of the named supplement.
Reports stimulant-like and opioid/sedative-like effects, drowsiness and rare serious seizures. More research on interactions is needed.
How this applies: Original source interpreted for trihexyphenidyl only within the stated preparation and endpoint limits.
Kratom may have stimulant-like and opioid/sedative-like effects; variable products. No exact trihexyphenidyl combination risk.
Source 3: original human clinical study
pubmed.ncbi.nlm.nih.gov · Source check Sep 10, 2026
Population: 12 healthy adults.
Kratom increased midazolam AUC 1.39-fold and peak concentration 1.50-fold, but did not change dextromethorphan exposure. Unchanged midazolam half-life suggests intestinal CYP3A inhibition.
How this applies: Original source interpreted for trihexyphenidyl only within the stated preparation and endpoint limits.
Single2g kratom tea with midazolam/dextromethorphan in12healthy adults; not trihexyphenidyl. Probe PK cannot establish trihexyphenidyl exposure or combined sedation.
Research assessment: · Open full citations ↗
Review and change history
- Publication status
- Published research summary
- Clinical review
- Not yet recorded
| Date | Update |
|---|---|
| Research summary published | |
| Article prepared | |
| Prepared exact trihexyphenidyl article with formulation-specific evidence and uncertainty. |
Article revision: bd2c17ba2607d2ff
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.