Herb & supplement monograph

Benfotiamine Drug Interactions, Uses, Effectiveness, Safety & More

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS ·Updated July 2026

What is this page for?

First and foremost: how Benfotiamine interacts with medications. The heart of this page is the interaction list — every drug Benfotiamine is known to interact with, and how serious each one is.

But these pages have grown well beyond that into a full monograph — what Benfotiamine is, what people use it for and how strong the evidence is, its safety and side effects, and answers to the questions we’re asked most — written and reviewed by the clinical staff at HelloPharmacist. It’s educational information from our licensed clinical databases, not medical advice, and we don’t sell or endorse products. Our editorial policy

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Reviewed by licensed pharmacists Sourced from Natural Medicines

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Interaction report

Drugs that interact with Benfotiamine

0 medications have a known interaction with Benfotiamine, graded by severity. Select any drug for the full evidence-based detail.

We don’t currently list any known drug interactions for Benfotiamine. This doesn’t guarantee none exist — always confirm with your pharmacist before combining supplements with your medications.

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 drug listed above links to the full report for that exact Benfotiamine combination — clinical detail, likelihood, evidence level, and citations.
Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Monograph

Benfotiamine: Uses, Safety & Side Effects

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Reviewed July 2026 ·

The bottom line

Benfotiamine is a man-made, fat-soluble form of vitamin B1 (thiamine) that the body may absorb more easily than regular thiamine. It is mostly studied for diabetic nerve problems, but the evidence is mixed and limited, so it should not replace prescribed treatments. Talk with your pharmacist or doctor before starting it.

Part used: Synthetic compound (a derivative of vitamin B1)
Common forms: Tablets, capsules

People commonly use it for

Diabetic nerve pain (neuropathy)
Supporting healthy nerve function
Thiamine deficiency
Oxidative stress
General wellness

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance

OverallUse caution

Generally well tolerated in studies, but long-term safety is not fully known.

PregnancyInsufficient reliable information

Insufficient reliable information is available; avoid using.

Read the full pregnancy detail

BreastfeedingInsufficient reliable information

Insufficient reliable information is available; avoid using.

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

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Overview

Benfotiamine is a synthetic (man-made) version of thiamine, also known as vitamin B1. Its chemical name is S-benzoylthiamine O-monophosphate. Unlike regular thiamine, which dissolves in water, benfotiamine is fat-soluble. This difference is thought to help it pass through cell membranes more easily and may lead to higher levels of active vitamin B1 in the body.

It is sold as a dietary supplement, usually in tablet or capsule form. People often take it hoping to support nerve health, manage problems linked to diabetes, or correct low thiamine levels. It is not a plant or herb but a laboratory-made compound based on a natural vitamin.

How it works

Once absorbed, benfotiamine is converted in the body into thiamine and its active form, thiamine diphosphate. Thiamine is an important helper (cofactor) for several enzymes that the body uses to turn food into energy.

Researchers believe benfotiamine may help reduce harmful byproducts of high blood sugar, sometimes called advanced glycation end-products (AGEs), and may lower certain types of cellular stress. These ideas come mostly from laboratory and animal studies, and it is not certain how strongly they apply to people in everyday life.

Effectiveness

Does Benfotiamine work?

Here’s what the research actually shows for each use — graded by Natural Medicines and reviewed by Dr. Brian Staiger, PharmD.

Evidence overview · 7 uses evaluated

1 Possibly effective 1 Leans ineffective 5 Insufficient evidence

How to read these evidence grades

Natural Medicines’ 7-point scale. We show each rating’s label word-for-word.

1EffectiveStrong, consistent evidence it works.

2Likely EffectiveGood evidence, though not yet conclusive.

3Possibly EffectiveSome evidence suggests a benefit.

4Possibly IneffectiveSome evidence it may not help.

5Likely IneffectiveFairly strong evidence it doesn’t help.

6IneffectiveStrong evidence it doesn’t work.

7Insufficient Reliable Evidence to RateToo little research to say either way.

Possibly Effective Diabetic neuropathy