Medication interaction hub

What Supplements Interact with Thiopental?

Thiopental brand name: Pentothal. Every interaction below applies to the brands too.

9 Interactions 1 Major 7 Moderate 1 Minor
Curated & coded by · Clinical Pharmacist · Updated September 15, 2026

Drug–supplement interaction data sourced from Natural Medicines Pro, the licensed clinical database from TRC Healthcare / Therapeutic Research, with additional analysis by the HelloPharmacist Pharmacist Team. Our sources · Editorial policy

What is this page for?

One answer, for one medication: what supplements and herbal products interact with Thiopental? Every vitamin, herb, and supplement ingredient we’ve checked against it is on this page, ranked by severity, each linking to the full report for that exact pair.

This page covers supplement interactions only — to check Thiopental against your other medications, use the drug–drug interaction checker. Educational information from our licensed clinical databases, not medical advice. Our editorial policy

HelloPharmacist Bottom Line
Our Pharmacist Explains
What is this? The interaction data in the HelloPharmacist supplement database is licensed from Natural Medicines Pro by TRC Healthcare (Therapeutic Research). HelloPharmacist pharmacists often add our own analysis and context on top of that licensed data — such as this Bottom Line summary and the notes on individual interaction pages — and any such commentary is noted as ours.

If a procedure is on your calendar and thiopental (Pentothal) is the drug that will put you under, the nine supplements listed here deserve genuine attention before anyone reaches for the syringe. One of them, fever bark, carries the lone major rating because a compound in it, reserpine, has been linked to unstable blood pressure and heart function during general anesthesia. Most of the rest deepen or stretch the drug's sedation, from cannabis slowing how the body clears barbiturates to Datura wrightii adding its own breathing suppression, a pairing that can be fatal.

Thiopental is not something you take at home. An anesthesia team gives it, which means nearly all of this risk is avoidable through honest disclosure. Seven of the nine entries rate moderate and one minor, mostly deeper or longer-lasting sedation, so tell your surgical team about every herb and supplement you use, ideally days ahead, and let them decide what to pause.

— , Clinical Pharmacist · July 18, 2026

Major 1 Moderate 7 Minor 1 No known interaction 1,443

This box checks one ingredient at a time (like turmeric or magnesium). Taking a supplement product with a whole label of ingredients? Search the product instead — we check every ingredient on it ↓

Top Ingredient Interactions

Thiopental: Top Interactions at a Glance

The most significant Thiopental supplement & herbal interactions, colored by severity. Tap any ingredient to open the full report for that pair.

Showing the 9 highest-ranked of 9 interacting ingredients — plus 1,443 more checked with no known interaction. See the complete ranked list.

Start here

The Major Interactions to Know About

The most clinically significant Thiopental + supplement combinations in our database, best-documented first. Open any card for the full report.

Major Likelihood Probable Fever Bark + Thiopentali

Theoretically, fever bark might increase the risk of cardiovascular instability with general anesthesia.

Read the full interaction
The complete list

Every Supplement Checked Against Thiopental

All 1,452 ingredients in our database, ranked by severity — 9 with a Thiopental interaction on file and 1,443 with none found. Filter by severity or search any ingredient; hover the for what each ingredient is.

Looking for an interaction with a specific supplement product? Search products instead ↓

Straight answers

Can You Take It With Thiopental?

One-line answers, one card per combination — scroll through today’s 17 and tap any card for the full report. A different set rotates in daily until every combination has had its turn.

Can you take Adrue with Thiopental?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Animal research suggests that taking adrue in combination with sodium thiopental increases total sleep time three-fold compared to the effec...

Full Adrue + Thiopental answer

Can you take Cannabis with Thiopental?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, cannabis might increase the levels and adverse effects of barbiturates.

Full Cannabis + Thiopental answer

Can you take Cowhage with Thiopental?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, concomitant use of cowhage and anesthesia might increase the risk of arrhythmias.

Full Cowhage + Thiopental answer

Can you take Datura Wrightii with Thiopental?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Datura wrightii causes respiratory depression.

Full Datura Wrightii + Thiopental answer

Can you take Delta-9-tetrahydrocannabinol (thc) with Thiopental?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, THC might increase the levels and adverse effects of barbiturates.

Full Delta-9-tetrahydrocannabinol (thc) + Thiopental answer

Can you take Pinellia Ternata with Thiopental?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Evidence from animal research shows that a Pinellia ternata preparation decreases activity and increases sleeping time.

Full Pinellia Ternata + Thiopental answer

Can you take Selenium with Thiopental?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, selenium might prolong the sedating effects of barbiturates.

Full Selenium + Thiopental answer

Can you take Eastern Red Cedar with Thiopental?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. In mice and rats given hexobarbital or pentobarbital, sleep time is reduced and metabolism of the drug is increased when they inhale essenti...

Full Eastern Red Cedar + Thiopental answer

Can you take Fever Bark with Thiopental?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. Theoretically, fever bark might increase the risk of cardiovascular instability with general anesthesia.

Full Fever Bark + Thiopental answer

Can you take Adrue with Thiopental?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Animal research suggests that taking adrue in combination with sodium thiopental increases total sleep time three-fold compared to the effec...

Full Adrue + Thiopental answer

Can you take Cannabis with Thiopental?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, cannabis might increase the levels and adverse effects of barbiturates.

Full Cannabis + Thiopental answer

Can you take Cowhage with Thiopental?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, concomitant use of cowhage and anesthesia might increase the risk of arrhythmias.

Full Cowhage + Thiopental answer

Can you take Datura Wrightii with Thiopental?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Datura wrightii causes respiratory depression.

Full Datura Wrightii + Thiopental answer

Can you take Delta-9-tetrahydrocannabinol (thc) with Thiopental?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, THC might increase the levels and adverse effects of barbiturates.

Full Delta-9-tetrahydrocannabinol (thc) + Thiopental answer

Can you take Pinellia Ternata with Thiopental?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Evidence from animal research shows that a Pinellia ternata preparation decreases activity and increases sleeping time.

Full Pinellia Ternata + Thiopental answer

Can you take Selenium with Thiopental?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, selenium might prolong the sedating effects of barbiturates.

Full Selenium + Thiopental answer

Can you take Eastern Red Cedar with Thiopental?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. In mice and rats given hexobarbital or pentobarbital, sleep time is reduced and metabolism of the drug is increased when they inhale essenti...

Full Eastern Red Cedar + Thiopental answer
Read the list like a pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

  • Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
  • Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
  • Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
  • No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

  • Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
  • Probable. Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
  • Possible. Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists
  • Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

  • Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
  • Each entry links to a full report with the clinical detail, likelihood, evidence level, and citations for that exact combination.
  • Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

How Does Our Interaction Checker Work?

Behind every verdict on this page is a category system. Our source database doesn’t document supplement interactions drug-by-drug — it documents them against groups of medications that behave the same way (for example, “drugs processed by the CYP3A4 liver enzyme” or “blood-thinning medications”).

So the check works in three steps: (1) Thiopental is classified into the pharmacology categories it belongs to, (2) every supplement interaction documented against any of those categories is inherited by Thiopental, and (3) each ingredient keeps its own severity, likelihood, and evidence grades from the underlying record. That’s why one supplement can carry several records for one drug — it may interact through more than one category.

Thiopental sits in 2 interaction categories. Open any one to see what the group means:

Barbiturates 6 ingredients

A pharmacology grouping from our source database: medications in this group share a property that certain supplements are known to interact with, so an interaction documented for the group applies to every drug in it.

6 of the supplement ingredients on this page reach Thiopental through this category.

Anesthesia 5 ingredients

A pharmacology grouping from our source database: medications in this group share a property that certain supplements are known to interact with, so an interaction documented for the group applies to every drug in it.

5 of the supplement ingredients on this page reach Thiopental through this category.

Check a real product

Take a Supplement Product? Check the Whole Bottle Against Thiopental

Most supplements are combination products — and the interaction may come from an ingredient you didn’t buy it for. Search any product below (or scan its label) and we’ll check every ingredient on it against Thiopental.

Search a supplement product

Type a product name, brand, or UPC — smart search across our full catalog.

Grounded search over our product catalog — every verdict comes from our interaction database, never AI guesswork. How we use AI

Or scan the bottle

Photograph any Supplement Facts panel — we read the ingredients and check each one against your medications. Free, in seconds.

Open the label scanner

Prefer typing? The interaction checker looks up products by name too.

Pharmacist Counseling Corner

Thiopental & Supplements: Common Questions

What supplements interact with Thiopental?
In our interaction database, 9 supplement and herbal ingredients have an interaction with Thiopental on file — 1 rated major, 7 moderate, and 1 minor. That number sounds scarier than it is: severity matters far more than the count, which is why the list on this page is ranked instead of alphabetical. Start at the top. The highest-ranked right now: Fever Bark, Adrue, Cannabis.
Which Thiopental supplement interactions are the most serious?
Focus on the major group: Fever Bark. A major rating means the combination can be clinically significant, not that harm is guaranteed — but it's exactly the kind of thing to run past your pharmacist before your next dose, not after. Jump to the ranked list.
Can I take vitamins or supplements while on Thiopental?
That depends entirely on which supplement. The honest answer for Thiopental is in the ranked list above — and if what you take is a combination product with a dozen ingredients, don't check them one by one: photograph the label with our scanner and we'll check the whole thing at once. Try the label scanner or the interaction checker.
Do brands like Pentothal have the same supplement interactions as Thiopental?
Yes — Pentothal all contain Thiopental, so everything on this page applies to them equally. Interactions belong to the active drug, never to the brand on the box; the same is true of generics.
Where do these interaction ratings come from?
Every rating comes from the Natural Medicines database — the same evidence-graded reference pharmacists and hospitals use — and each interaction carries three separate grades: severity (how bad it can be), likelihood (how well it's documented in studies and case reports), and an evidence level. Our pharmacists review the content; we never let an AI decide an interaction. See how to read the ratings and our editorial policy.
What about Thiopental and my other medications?
This page covers Thiopental against supplements and herbal ingredients. Checking Thiopental against your other prescription or OTC medications is a different tool — our drug interaction checker covers that side. Head to the drug–drug interaction checker.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Where next

More Free Pharmacist Tools

Supplement interaction checker Check any supplement or product against your medications Supplement label scanner Photograph a Supplement Facts panel; we check every ingredient Browse medications A–Z Every drug we’ve checked against herbs & supplements Ingredient directory Every vitamin, herb & mineral we track, with interaction data Product directory Look up any bottle by name, brand, or barcode Ask a pharmacist Free, personal answer from our licensed team
Sourcing

Where This Data Comes From — and Why You Can Trust It

🧪 Licensed clinical database

Every interaction verdict on this page comes from Natural Medicines Pro (TRC Healthcare / Therapeutic Research) — the same evidence-graded reference used by pharmacists and hospitals. We license this data directly; we do not scrape it, and no AI invents an interaction.

🧑‍⚕️ Pharmacist review

This page is curated and coded by , Clinical Pharmacist, with additional analysis by the HelloPharmacist Pharmacist Team. Editorial commentary is ours; the licensed interaction records are shown as sourced.

🔄 Kept current

Our interaction database refreshes on a weekly cycle, and this page re-checks the live database every time it’s rebuilt — what you see reflects the database as of September 15, 2026.

🔍 Full transparency

How every dataset on this site is sourced, licensed, and updated is documented publicly: our data sources · editorial policy · how we use AI.

Educational information, not medical advice. An interaction being on file does not mean it will happen to you — and absence of one is not proof of safety. Never start or stop a medication or supplement without talking to your pharmacist or doctor.