The short answer
Confirm the valerian species before combining this root product with fentanyl. If it is Valeriana officinalis, added drowsiness is a reasonable concern, but the generic root name does not establish that identity.
What this answer covers
Generic root/rhizome node; confirm Valeriana officinalis species before applying its guidance.
- Supplement or preparation
- Radix et Rhizoma Valerianae
- Medication ingredient
- fentanyl
Why the combination matters
Fentanyl can impair consciousness and breathing. Its labels warn that other CNS depressants can intensify those effects. Supplement guidance advises caution with other sedating substances.
The evidence has limits
No inspected study measures this exact combination’s adverse-event rate. A kava and valerian trial found no clear sleep or anxiety benefit, which does not establish absence of sedation or safety with fentanyl.
Confirm the preparation and fentanyl formulation
A skin patch produces prolonged exposure and is restricted to opioid-tolerant patients; injection is used in a monitored clinical setting. The generic root name does not establish the valerian species. These differences matter when evaluating a supplement.
Review use before a procedure or a change
Tell the prescribing or anesthesia team about use before treatment. No short spacing interval has been shown to make co-use safe. Avoid driving while impaired; slow breathing or unusual difficulty waking requires emergency help.
Evidence and practical considerations
Side effects & toxicity
The current generic root/rhizome identity does not establish Valeriana officinalis. Species-specific sedation evidence cannot validate the original unidentified-product claim; a narrower confirmed-species precaution is retained separately.
- Exact scope
- Generic root/rhizome node; confirm Valeriana officinalis species before applying its guidance. with Fentanyl4337 IN; human IV/IM citrate or transdermal product with opioid-tolerance and route boundaries.
- Medication form and route
- intravenous medication; intramuscular medication; transdermal 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 fentanyl
Opioid respiratory depression/CNS-depressant warnings and serotonin-syndrome precautions with serotonergic drugs.
How this applies: Exact fentanyl RxCUI 4337 IN, with stated salt/formulation/route bridge.
Not transdermal or transmucosal dosing; no supplement-specific event rate.
Source 2: current product label
dailymed.nlm.nih.gov · Source check Sep 10, 2026
Population: People prescribed fentanyl
CNS-depressant and serotonergic interaction warnings; heat and formulation-specific exposure risks.
How this applies: Exact fentanyl RxCUI 4337 IN, with stated salt/formulation/route bridge.
Not appropriate for opioid-naive patients or acute postoperative pain; surgical IV studies cannot define patch co-use safety.
Source 3: federal supplement safety guidance
nccih.nih.gov · Source check Sep 10, 2026
Population: Users of the specified supplement.
Possible but unproven sleep-inducing effects; advises against combining valerian with alcohol or sedatives.
How this applies: Original source interpreted for fentanyl only within the stated preparation and endpoint limits.
Not a direct fentanyl combination trial; original preparation, dose and endpoint limits apply. No exact-pair adverse-event rate or protective spacing established.
Source 4: federal botanical identity and safety guidance
ods.od.nih.gov · Source check Sep 10, 2026
Population: Users of Valeriana officinalis.
The fact sheet covers only V. officinalis among more than 250 valerian species; possible additive sedation is theoretical.
How this applies: Original source interpreted for fentanyl only within the stated preparation and endpoint limits.
Not a direct fentanyl combination trial; original preparation, dose and endpoint limits apply. No exact-pair adverse-event rate or protective spacing established.
Source 5: original human study
pubmed.ncbi.nlm.nih.gov · Source check Sep 10, 2026
Population: 391 participants with anxiety and insomnia.
Neither botanical improved its primary anxiety/insomnia outcome over placebo.
How this applies: Original source interpreted for fentanyl only within the stated preparation and endpoint limits.
Not a direct fentanyl combination trial; original preparation, dose and endpoint limits apply. No exact-pair adverse-event rate or protective spacing established.
Research assessment: · Open full citations ↗
Side effects & toxicity
If the product is confirmed as Valeriana officinalis, additive drowsiness with fentanyl is a conditional concern based on medication labeling and species-specific guidance.
- Exact scope
- Confirmed Valeriana officinalis root preparation, not an unidentified generic valerian root. with Exact fentanyl ingredient and labeled formulations described in this article.
- Medication form and route
- intravenous medication; intramuscular medication; transdermal medication; oral supplement
What remains uncertain
- No exact-pair event rate or protective interval established.
Factors that may matter: Confirmed botanical identity; Preparation; Dose; Other sedatives.
Read the supporting source summaries
Source 1: current product label
dailymed.nlm.nih.gov · Source check Sep 10, 2026
Population: People prescribed fentanyl
Opioid respiratory depression/CNS-depressant warnings and serotonin-syndrome precautions with serotonergic drugs.
How this applies: Exact fentanyl RxCUI 4337 IN, with stated salt/formulation/route bridge.
Not transdermal or transmucosal dosing; no supplement-specific event rate.
Source 2: current product label
dailymed.nlm.nih.gov · Source check Sep 10, 2026
Population: People prescribed fentanyl
CNS-depressant and serotonergic interaction warnings; heat and formulation-specific exposure risks.
How this applies: Exact fentanyl RxCUI 4337 IN, with stated salt/formulation/route bridge.
Not appropriate for opioid-naive patients or acute postoperative pain; surgical IV studies cannot define patch co-use safety.
Source 3: federal supplement safety guidance
nccih.nih.gov · Source check Sep 10, 2026
Population: Users of the specified supplement.
Possible but unproven sleep-inducing effects; advises against combining valerian with alcohol or sedatives.
How this applies: Original source interpreted for fentanyl only within the stated preparation and endpoint limits.
Not a direct fentanyl combination trial; original preparation, dose and endpoint limits apply. No exact-pair adverse-event rate or protective spacing established.
Source 4: federal botanical identity and safety guidance
ods.od.nih.gov · Source check Sep 10, 2026
Population: Users of Valeriana officinalis.
The fact sheet covers only V. officinalis among more than 250 valerian species; possible additive sedation is theoretical.
How this applies: Original source interpreted for fentanyl only within the stated preparation and endpoint limits.
Not a direct fentanyl combination trial; original preparation, dose and endpoint limits apply. No exact-pair adverse-event rate or protective spacing established.
Source 5: original human study
pubmed.ncbi.nlm.nih.gov · Source check Sep 10, 2026
Population: 391 participants with anxiety and insomnia.
Neither botanical improved its primary anxiety/insomnia outcome over placebo.
How this applies: Original source interpreted for fentanyl only within the stated preparation and endpoint limits.
Not a direct fentanyl combination trial; original preparation, dose and endpoint limits apply. No exact-pair adverse-event rate or protective spacing established.
Research assessment: · Open full citations ↗
Review and change history
- Publication status
- Published research summary
- Clinical review
- Not yet recorded
| Date | Update |
|---|---|
| Article prepared | |
| Prepared exact fentanyl article with formulation-specific evidence and uncertainty. | |
| Research summary published |
Article revision: 99c26e825f62e9c6
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.