The short answer
Valeriana officinalis may add to thioridazine-related impairment. Review the actual preparation; the exact combined risk and a protective spacing interval have not been established.
What this answer covers
Oral thioridazine with the exact supplement preparation described.
- Supplement or preparation
- Valeriana officinalis
- Medication ingredient
- thioridazine
Identify the valerian preparation
This assessment concerns Valeriana officinalis. Tea, root powder, extract and multi-ingredient sleep products can deliver different exposures; check every ingredient on the package.
The official precaution concerns sedating substances
Federal valerian guidance describes a possible but unproven sleep-inducing effect and advises against use with sedatives. Thioridazine can affect alertness, so a confirmed sedating preparation deserves review.
The magnitude and timing remain uncertain
The reviewed guidance does not measure added impairment from this exact pair or provide a dose that works safely across products. It also does not establish a need for valerian during treatment or an hours-apart schedule that prevents overlap.
Review the actual products
Bring the supplement label and your full medication list to the pharmacist, especially if thioridazine already affects alertness. Avoid driving when sleepy or impaired. No supplement dose or short spacing interval has been established to prevent overlapping effects.
Evidence and practical considerations
Side effects & toxicity
Valeriana officinalis may add to thioridazine-related impairment. Review the actual preparation; the exact combined risk and a protective spacing interval have not been established.
- Exact scope
- Oral thioridazine with the exact supplement preparation described. with Oral thioridazine with the stated label and formulation limits.
- Medication form and route
- oral
What remains uncertain
- Where the root species is unspecified, its identity remains unresolved. Conditional Valeriana officinalis guidance does not authenticate the species or quantify the exact combination. Supplement need and timing are not established; a confirmed sedating preparation requires separate review.
Factors that may matter: Exact preparation and amount; Other medicines; Seizure history, alertness or electrolyte status where relevant.
Read the supporting source summaries
Source 1: Current U.S. regulatory product labeling
dailymed.nlm.nih.gov · Source check Sep 10, 2026
Population: Patients prescribed oral thioridazine.
CYP2D6 inhibition or reduced activity can increase thioridazine exposure and potentially fatal QT-related arrhythmias. Baseline ECG and potassium testing, potassium correction before treatment and periodic monitoring are recommended. Drowsiness and rare seizures are described.
How this applies: Exact ingredient and oral-route clinical context.
Label class warnings do not establish every exact botanical interaction, event rate or protective supplement interval.
Source 2: Federal supplement guidance
nccih.nih.gov · Source check Sep 10, 2026
Population: People considering the named botanical or supplement.
Sedation is possible but not proven; guidance advises avoiding use with sedatives. The material discussed is Valeriana officinalis.
How this applies: The generic root/rhizome inventory name does not prove species identity, so any application is conditional.
General guidance does not quantify this exact medication combination or establish a universal protective interval.
Research assessment: · Open full citations ↗
Review and change history
- Publication status
- Published research summary
- Clinical review
- Not yet recorded
| Date | Update |
|---|---|
| Article prepared | |
| Initial source-checked draft with exact preparation limits, original study findings and uncertainty. Clinical review not recorded. | |
| Research summary published |
Article revision: d601055b27409808
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.