Drug & supplement interaction

Brewer's Yeast + Griseofulvin

Griseofulvin brand names: Fulvicin PG, Fulvicin-U/F, Grisactin Ultra, Grisactin.

Minor Interaction
Medically reviewed by · Updated September 2026
The bottom line Minor

Brewer's Yeast has a minor interaction with Griseofulvin. Theoretically, taking antifungals with some brewer's yeast products might decrease the effectiveness of brewer's yeast.

Read the full interaction report
SeverityMinor
LikelihoodPossible
EvidenceD
What do Severity, Likelihood & Evidence mean?
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Interaction report

Brewer's Yeast and Griseofulvin

Here is the interaction we found between these two, with the evidence behind it.

Minor

ANTIFUNGALS

Why this applies to Griseofulvin

Griseofulvin falls under ANTIFUNGALS — the group Brewer's Yeast interacts with.

Theoretically, taking antifungals with some brewer's yeast products might decrease the effectiveness of brewer's yeast.
Some brewer's yeast products contain live yeast. Therefore, simultaneously taking antifungals might kill a significant number of the organisms.
Severity Minor Likelihood Possible Evidence D

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.

Dr. Brian Staiger, PharmD, BCPS
Dr. Brian Staiger explains PharmD, Clinical Pharmacist

Here's the good news: this one isn't about your medicine being affected. Griseofulvin works by fighting fungal infections, and brewer's yeast is a type of fungus. So if your brewer's yeast product contains live, active yeast, taking it alongside an antifungal like griseofulvin could knock out some of those live organisms and make the supplement less useful. Your griseofulvin keeps doing its job normally.

This is only a theoretical concern based on how the two work, and it's rated minor. Many brewer's yeast supplements are inactivated anyway, so it may not matter at all. If you're taking brewer's yeast for a specific reason, just ask your pharmacist about spacing the doses apart.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Lewis SJ, Freedman AR. Review article: the use of biotherapeutic agents in the prevention and treatment of gastrointestinal disease. Aliment Pharmacol Ther 1998;12:807-22. PubMed

What These Ratings Mean

Every interaction above is graded three ways — here’s the key to each label.

Severity how clinically significant the interaction is
Major

Clinically significant. Avoid the combination, or use only under close professional supervision.

Moderate

Usually worth avoiding or managing — may need monitoring, a dose change, or timing apart.

Minor

Generally not serious. Be aware of it and mention it to your pharmacist.

Likelihood how strong the evidence is that the interaction actually happens in people
  • LikelyWell-controlled human studies have demonstrated the likely existence of this interaction.
  • ProbableInteraction 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.
  • PossibleInteraction 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.
  • UnlikelyInteraction has been demonstrated in animal or in lab research but has been shown not to occur in humans.
Evidence the quality of the studies behind the rating (graded A–D)
  • AHigh-quality meta-analysis (quantitative systematic review).
  • BCase-control study.
  • CConsensus.
  • DAnecdotal evidence.

These ratings are for information only. Never start, stop, or otherwise change your therapy before speaking with your provider.

Keep it in perspective

Brewer's Yeast Also Interacts With Other Medications

Brewer's Yeast has 9 major, 87 moderate, 39 minor known drug interactions in our database — the Griseofulvin one above is one of them. If you take anything else, check it against the full list below.

Major 9 Moderate 87 Minor 39 No known interaction 2,695 (incl. Griseofulvin)
Taking anything else?

Check Another of Your Medications Against Brewer's Yeast

Covers the 2,830 medications we’ve checked against Brewer's Yeast. Pick one to open its full report.

Everything else you take

See Every Supplement That Interacts With Griseofulvin

This page covers Brewer's Yeast only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Griseofulvin page lists 61 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Alfalfa (moderate), Alkanna (moderate), Alpine Ragwort (moderate) and Angelica Archangelica (moderate).

By severity: 1 major · 47 moderate · 13 minor.

From our pharmacist’s overview on the Griseofulvin page

“If you take griseofulvin for a fungal infection of the skin, scalp, or nails, give this list of 61 ingredients real attention. The single major entry is activated charcoal, which binds the drug in your gut so less of it reaches your blood and the infection gets less treatment.”

Reviewed by 2 · Jul 18, 2026

Open the Griseofulvin interaction page

One more smart check

Taking Brewer's Yeast as Part of a Dietary Supplement Product? Check It for Interactions

We hold 126 real supplement products containing Brewer's Yeast, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Brewer's Yeast. Your product may carry other ingredients that interact with Griseofulvin too, on top of Brewer's Yeast — and those would not show on this page. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Brewer's Yeast and Griseofulvin 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 Brewer's Yeast
Top half

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

29 days ago today
Medication Griseofulvin
Steady interest

#2,581 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.

Supplement

About Brewer's Yeast

What is Brewer's Yeast?

Brewer's Yeast
  • Source of B vitamins
  • Diarrhea (certain types)
  • Cold and flu support
  • Digestive health
  • Acne and skin health
  • Blood sugar support

Brewer's yeast is a nutrient-rich fungus that provides B vitamins, protein, and minerals, and a related yeast product (S. boulardii) is used for some types of diarrhea. Most other health claims have limited or weak evidence. It is generally well tolerated as a food or supplement, but talk to your pharmacist or doctor before using it regularly, especially if you have a weakened immune system.

Read the full Brewer's Yeast monograph & all interactions
Medication

About Griseofulvin

What Is Griseofulvin Used For?

Brand names: Fulvicin PG, Fulvicin-U/F, Grisactin Ultra, Grisactin

Griseofulvin treats dermatophyte (ringworm-type) fungal infections of the skin, hair, and nails that haven't cleared up with topical (cream or ointment) treatment alone. It is used for tinea corporis (ringworm of the body), tinea pedis (athlete's foot), tinea cruris (jock itch), tinea barbae (ringworm of the beard area), tinea capitis (ringworm of the scalp), and tinea unguium (fungal nail infection).

It only works against specific dermatophyte fungi. Griseofulvin does not treat bacterial infections, yeast infections (candidiasis), or other fungal infections such as histoplasmosis, sporotrichosis, or tinea versicolor. A lab test or fungal culture should confirm the infection before treatment starts.

See full Griseofulvin drug information
Keep checking

Other Drugs & Brewer's Yeast

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

9Major
87Moderate
39Minor
2,694No known interaction
9 Major 87 Moderate 39 Minor 2,694 No interaction
Major

9 interactions

Moderate

87 interactions

Showing 60 of 87 moderate interactions — see all 87 on the Brewer's Yeast page.

Minor

39 interactions

No interaction 2,694 drugs checked — show the list

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

Showing the 60 most looked-up of 2,694 medications checked with no known interaction — see the full Brewer's Yeast list.

See the full Brewer's Yeast interactions page
See every supplement checked against Griseofulvin, ranked by severity
Sources

Sources & How We Checked

Interaction details are evidence-graded and sourced from the Natural Medicines database. The medication overview comes from MedlinePlus.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

Keep exploring
Brewer's Yeast monograph › Uses, safety, and every drug interaction in one place Griseofulvin supplement interactions › Every supplement checked against Griseofulvin, ranked by severity Griseofulvin drug information › The full plain-English guide to this medication Supplement interaction checker › Check any supplement or product against your medications Browse medications A–Z › Every drug we've checked against herbs & supplements Ask a pharmacist › Free, personal answer from our licensed team
Pharmacist Counseling Corner

Taking Brewer's Yeast and Griseofulvin Together: Common Questions

Can you take Brewer's Yeast with Griseofulvin?
There is only a minor interaction, which is usually not serious. Read the full details on this page and confirm with your pharmacist before combining them.
How serious is the Brewer's Yeast and Griseofulvin interaction?
We rate it Minor. This interaction is generally not clinically significant, but it remains worth noting and discussing with your pharmacist.

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

Still Have a Question About Griseofulvin and Brewer's Yeast?

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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.