Drug & supplement interaction

Sulbutiamine + Thioridazine

Thioridazine brand name: Mellaril.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 13, 2026
The bottom line No known interaction

We found no known interaction between Sulbutiamine and Thioridazine in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first. Additionally, although there is no interaction, the two are separately associated with some of the same side effects, which would make a new symptom harder to attribute to one or the other.

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Interaction report

Sulbutiamine and Thioridazine

We checked these two against our interaction database. Here is what we found.

No Known Interaction Found

We did not find a documented interaction between Thioridazine and Sulbutiamine in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.

Worth understanding: our licensed dataset holds no drug-interaction record for Sulbutiamine at all — not against Thioridazine, and not against any other medication we track. This verdict therefore rests on the absence of any recorded data, not on research that looked at this combination and found nothing. We cannot rule an interaction out.

If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.

Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.

Sulbutiamine safety at a glance

Sulbutiamine overall Use caution Generally well tolerated short-term, but long-term safety and quality of evidence are limited.
Pregnancy Avoid Not enough safety data; avoid use during pregnancy.
Breastfeeding Avoid Not enough safety data; avoid use while breastfeeding.

Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Thioridazine and Sulbutiamine? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

No Interaction Found — But Data Suggests Sulbutiamine and Thioridazine May Share Several of the Same Side Effects

This is not an interaction. Neither one changes how your body handles the other, and nothing here says they react together. What our sources do show is that each has separately been linked to the effects below — so taking both can make those effects more likely to turn up, and harder to pin on one or the other if they do.

  • Tremor or shakiness / Drowsiness / Headache Additional detail

    Sulbutiamine

    “Cases of headache, insomnia, tremor, and drowsiness were each reported in one patient (0.06% of patients) using a combination of anti-infective medication and sulbutiamine.”

    Sulbutiamine · Natural Medicines adverse-effect record, reported in cluster headache.

    1 source cited
    1. 24374. Shah S. Adjuvant role of vitamin B analogue (sulbutiamine) with anti-infective treatment in infection associated asthenia. J Assoc Physicians India. 2003;51:891-5.

    Thioridazine

    Listed in the ADVERSE REACTIONS section of the FDA label for Thioridazine. Read the label on DailyMed ›

  • Nausea Additional detail

    Sulbutiamine

    “Five cases of nausea have been reported for patients using a combination of anti-infective medication and sulbutiamine.”

    Sulbutiamine · Natural Medicines adverse-effect record, reported in nausea and vomiting.

    1 source cited
    1. 24374. Shah S. Adjuvant role of vitamin B analogue (sulbutiamine) with anti-infective treatment in infection associated asthenia. J Assoc Physicians India. 2003;51:891-5.

    Thioridazine

    Listed in the ADVERSE REACTIONS section of the FDA label for Thioridazine. Read the label on DailyMed ›

Reported for Sulbutiamine but not commonly for Thioridazine: trouble sleeping.

Effects for Thioridazine come from the ADVERSE REACTIONS section of its FDA label; effects for Sulbutiamine come from the Natural Medicines adverse-effect record, quoted above. Wording is matched across sources by our own clinical vocabulary, so treat this as a prompt to pay attention, not a diagnosis.

From our Q&A

Questions About Sulbutiamine or Thioridazine

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Sulbutiamine or Thioridazine, not necessarily both, but if one is close to what you were about to ask it will usually go further than a database entry can:

Not quite your question? Ask our pharmacists directly — it is free, there is no account required, and answers usually come back within 24 hours.

Everything else you take

See Every Supplement That Interacts With Thioridazine

This page covers Sulbutiamine only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Thioridazine page lists 168 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), American Hellebore (major), Arsenic (major), Cesium (major) and Ephedra (major).

By severity: 11 major · 125 moderate · 32 minor.

From our pharmacist’s overview on the Thioridazine page

“Thioridazine (Mellaril) is an older antipsychotic already known for disturbing the heart's rhythm, and the supplements that worry me most here do the same thing, stretching the QT interval further. Grapefruit in large amounts sits in that group, alongside ephedra and several other major-rated entries.”

Reviewed by 2 · Jul 18, 2026

Open the Thioridazine interaction page

One more smart check

Taking Sulbutiamine as Part of a Dietary Supplement Product? Check It for Interactions

We hold 64 real supplement products containing Sulbutiamine, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Sulbutiamine. Even though Sulbutiamine itself has no known interaction with Thioridazine, another ingredient on your label might. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Sulbutiamine and Thioridazine Sit Against Everything Else

Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.

Supplement Sulbutiamine
Top half

#587 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Thioridazine
Steady interest

#2,523 of 2,830 medications looked up here in the last 7 days

29 days ago today

Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.

Where does our data come from?
  • Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions.
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Sulbutiamine reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Sulbutiamine and Thioridazine records this page draws on were last updated July 10, 2026.
  • What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
Data structure & sourcing designed and verified by .
Supplement

About Sulbutiamine

What is Sulbutiamine?

  • Fatigue and low energy
  • Memory and focus
  • Mental clarity
  • Mood support
  • Vitamin B1 deficiency support

Sulbutiamine is a man-made, fat-soluble form of vitamin B1 (thiamine) developed in Japan, often taken for fatigue and to support mental energy and focus. Human evidence is limited and mostly older or small, so its real benefits are uncertain. It is generally well tolerated short-term, but you should talk with a pharmacist or doctor before using it, especially if you have a health condition.

Synthetic compound (not from a plant) · Tablets, capsules

An interaction check asks whether these two react with each other — it does not ask whether Sulbutiamine is a good idea for someone in your situation. Here is what our Sulbutiamine record says about it on its own.

Sulbutiamine: dosing

There is no firmly established standard dose for sulbutiamine as a supplement. Amounts used in older studies and on product labels vary, and there is not enough strong evidence to recommend one clear dose.The safest approach is to follow the directions on the product label and not take more than suggested.

From our Sulbutiamine monograph — the full record covers uses, side effects and every documented interaction.

Read the full Sulbutiamine monograph & all interactions
Medication

About Thioridazine

What Is Thioridazine Used For?

Brand name: Mellaril

Thioridazine Hydrochloride tablets are used for the management of schizophrenia — but only in patients who have already tried at least two other antipsychotic medications without adequate results, either because those drugs didn't work well enough or caused intolerable side effects.

Because thioridazine carries serious heart-rhythm risks, it is considered a last-resort option for schizophrenia, not a first-line treatment. It is not approved for dementia-related psychosis or any other psychiatric condition.

See full Thioridazine drug information
Keep checking

Other Drugs & Sulbutiamine

Browse every other medication we’ve checked against Sulbutiamine — both the ones with a known interaction and the ones without. Select any drug for the full detail.

0Major
0Moderate
0Minor
2,829No known interaction
2,829 No interaction
No interaction 2,829 drugs checked — show the list

We also checked Sulbutiamine against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,829 medications checked with no known interaction — see the full Sulbutiamine list.

See the full Sulbutiamine interactions page
See every supplement checked against Thioridazine, ranked by severity
Evidence & sources

Sulbutiamine References

The 4 references that drive our Sulbutiamine monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.

  1. Shah S. Adjuvant role of vitamin B analogue (sulbutiamine) with anti-infective treatment in infection associated asthenia. J Assoc Physicians India. 2003;51:891-5.
  2. Loo H, Poirier M, Ollat H, et al. [Effects of subutiamine (Arcalion 200) on psycho-behavioral inhibition in major depressive episodes]. Encephale. 2000;26(2):70-5.
  3. Kiew K, Wan Mohamad W, Ridzuan A, et al. Effects of sulbutiamine on diabetic polyneuropathy: an open randomized controlled study in type 2 diabetics. Malays J Med Sci. 2002;9(1):21-7.
  4. Sevim S, Kaleagasi H, Tasdelen B. Sulbutiamine shows promising results in reducing fatigue in patients with multiple sclerosis. Mult Scler Relat Disord. 2017;16:40-43. PubMed

Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Pharmacist Counseling Corner

Taking Sulbutiamine and Thioridazine Together: Common Questions

Is it safe to take Sulbutiamine with Thioridazine?
We do not list a known interaction between Sulbutiamine and Thioridazine. That does not guarantee the combination is risk-free, so confirm with your pharmacist or doctor — especially if you take other medications or have a health condition.
Do Sulbutiamine and Thioridazine have any of the same side effects?
Yes — our sources link each of them separately to 4 of the same effects. That is not an interaction: neither changes how your body handles the other. It does mean that if one of those effects turns up, it can be harder to tell which one is behind it. They are listed on this page with the source behind each.
Does Thioridazine interact with any supplements?
Yes. Thioridazine has documented interactions with 168 supplements in our database — Sulbutiamine is not one of them. The Thioridazine interaction page linked on this page lists every one, ranked by severity.

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

Where next

Keep Exploring

Sulbutiamine monograph Uses, safety profile, and every drug interaction in one place Thioridazine drug information The full plain-English guide to this medication Thioridazine supplement interactions Every supplement checked against Thioridazine, ranked by severity Supplement interaction checker Check any supplement or product against your medications Browse medications A–Z Every drug we’ve checked against herbs & supplements References The 4 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Thioridazine and Sulbutiamine?

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This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.