Drug & supplement interaction

Brewer's Yeast + Sofosbuvir, Velpatasvir

Sofosbuvir, Velpatasvir brand name: Epclusa.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 20, 2026
The bottom line No known interaction

We found no known interaction between Brewer's Yeast and Sofosbuvir, Velpatasvir 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

Brewer's Yeast and Sofosbuvir, Velpatasvir

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 Sofosbuvir, Velpatasvir and Brewer's Yeast 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.

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.

Brewer's Yeast safety at a glance

Brewer's Yeast overall Use caution Generally well tolerated in food amounts, but it can cause gas and may not be safe for people with weakened immune systems or certain conditions.
Pregnancy Use caution Likely fine in normal food amounts, but the safety of concentrated supplements during pregnancy is not well studied, so check with your provider.
Breastfeeding Use caution Food amounts are likely fine, but there is not enough information on supplement doses, so use caution and ask your provider.

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

Still wondering about combining Sofosbuvir, Velpatasvir and Brewer's Yeast? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Sofosbuvir, Velpatasvir

Interactions in our licensed database are recorded against drug classes, not just single drug names. Sofosbuvir, Velpatasvir is filed under 7 classifications — including cytochrome p450 2b6 (cyp2b6) substrates, cytochrome p450 2c8 (cyp2c8) substrates, p-glycoprotein substrates. Brewer's Yeast has documented interactions with 4 drug classes — the most serious being monoamine oxidase inhibitors (maois) (major), antidiabetes drugs (moderate) and lithium (moderate) — and none of Sofosbuvir, Velpatasvir’s classifications are among them.

Classification data comes from our licensed Natural Medicines dataset. A medication can belong to classes beyond those recorded there, so this describes how the check was run — it is not a safety guarantee.

Keep it in perspective

Brewer's Yeast Does Interact With Other Medications

Brewer's Yeast has 9 major, 87 moderate, 40 minor known drug interactions in our database — Sofosbuvir, Velpatasvir isn’t one of them. If you take anything else, check it against the full list below.

Major 9 Moderate 87 Minor 40 No known interaction 2,694 (incl. Sofosbuvir, Velpatasvir)
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.

What to actually watch for

No Interaction Found — But Data Suggests Brewer's Yeast and Sofosbuvir, Velpatasvir 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. One of them is worth acting on rather than waiting out — marked below.

  • A severe allergic reaction Worth acting on Additional detail

    Brewer's Yeast

    “Allergic reactions to brewer's yeast can occur in hypersensitive individuals. Symptoms include itching, urticaria, local or general exanthemas, and Quincke's edema (2). Rarely, anaphylaxis may occur. In one case, a 33-year-old male experienced dyspnea, chest tightness, and throat tightness shortly after ingesting a few sips of craft beer brewed using brewer's yeast.”

    Brewer's Yeast · Natural Medicines adverse-effect record, reported in pruritus.

    2 sources cited
    1. 2. Blumenthal M, ed. The Complete German Commission E Monographs: Therapeutic Guide to Herbal Medicines. Trans. S. Klein. Boston, MA: American Botanical Council, 1998.
    2. 111107. Mourey F, Decherf A, Jeanne JF, et al. Saccharomyces cerevisiae I-3856 in irritable bowel syndrome with predominant constipation. World J Gastroenterol 2022;28(22):2509-2522.

    Sofosbuvir, Velpatasvir

    Listed in the ADVERSE REACTIONS section of the FDA label for Sofosbuvir, Velpatasvir. Read the label on DailyMed ›

  • Swelling Additional detail

    Brewer's Yeast

    Recorded for Brewer's Yeast in the same Natural Medicines adverse-effect record shown under A severe allergic reaction above.

    Sofosbuvir, Velpatasvir

    Listed in the ADVERSE REACTIONS section of the FDA label for Sofosbuvir, Velpatasvir. Read the label on DailyMed ›

  • Headache Additional detail

    Brewer's Yeast

    “Orally, brewer's yeast can cause migraine-like headaches in sensitive individuals (2).”

    Brewer's Yeast · Natural Medicines adverse-effect record, reported in migraine headache.

    1 source cited
    1. 2. Blumenthal M, ed. The Complete German Commission E Monographs: Therapeutic Guide to Herbal Medicines. Trans. S. Klein. Boston, MA: American Botanical Council, 1998.

    Sofosbuvir, Velpatasvir

    Listed in the ADVERSE REACTIONS section of the FDA label for Sofosbuvir, Velpatasvir. Read the label on DailyMed ›

Reported for Brewer's Yeast but not commonly for Sofosbuvir, Velpatasvir: an allergic reaction, chest pain, stomach pain and bloating or gas.

Effects for Sofosbuvir, Velpatasvir come from the ADVERSE REACTIONS section of its FDA label; effects for Brewer's Yeast 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.

Everything else you take

See Every Supplement That Interacts With Sofosbuvir, Velpatasvir

This page covers Brewer's Yeast only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Sofosbuvir, Velpatasvir page lists 147 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Grapefruit (major), St. John's Wort (major), Acacia Rigidula (moderate) and Adrafinil (moderate).

By severity: 3 major · 108 moderate · 36 minor.

From our pharmacist’s overview on the Sofosbuvir, Velpatasvir page

“Epclusa (the sofosbuvir and velpatasvir combination) is a finite course meant to cure hepatitis C, so I treat its supplement interactions with genuine seriousness, since anything that lowers the drug's level can undermine the cure itself. St.”

Reviewed by 2 · Jul 18, 2026

Open the Sofosbuvir, Velpatasvir 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. Even though Brewer's Yeast itself has no known interaction with Sofosbuvir, Velpatasvir, 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 Brewer's Yeast and Sofosbuvir, Velpatasvir 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

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

29 days ago today
Medication Sofosbuvir, Velpatasvir
Steady interest

#2,358 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 Brewer's Yeast reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Brewer's Yeast and Sofosbuvir, Velpatasvir 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 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.

Saccharomyces cerevisiae · Saccharomycetaceae · Whole dried yeast cells (and their fermentation products) · Tablets, capsules, powder, flakes, liquid

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

Brewer's Yeast: dosing

There is no single official or proven dose for brewer's yeast. Products vary widely in their form (tablets, powder, flakes) and in how much yeast they contain.The best approach is to follow the directions on the product label and start with a lower amount to see how your stomach handles it. They can help you decide whether it is appropriate and whether a different, better-studied product (such as a specific probiotic) might be a better fit.

From our Brewer's Yeast monograph — the full record covers uses, side effects and every documented interaction.

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

About Sofosbuvir and Velpatasvir

What Is Sofosbuvir and Velpatasvir Used For?

Brand name: Epclusa

Sofosbuvir and velpatasvir treats chronic hepatitis C virus (HCV) infection caused by genotypes 1, 2, 3, 4, 5, or 6 — covering all the major strains. It is approved for adults and children 3 years of age and older, whether or not they have cirrhosis (liver scarring).

It is used on its own in patients without cirrhosis or with compensated cirrhosis (where the liver is scarred but still functioning). In patients with decompensated cirrhosis (more advanced liver disease where the liver is no longer coping), it is used in combination with another medicine called ribavirin. Epclusa is a brand that is also available as oral pellets for younger children.

See full Sofosbuvir and Velpatasvir 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
40Minor
2,693No known interaction
9 Major 87 Moderate 40 Minor 2,693 No interaction
Major

9 interactions

Moderate

87 interactions

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

Minor

40 interactions

No interaction 2,693 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 2,693 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 Sofosbuvir, Velpatasvir, ranked by severity
Evidence & sources

Brewer's Yeast References

The 6 references that drive our Brewer's Yeast 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. Blumenthal M, ed. The Complete German Commission E Monographs: Therapeutic Guide to Herbal Medicines. Trans. S. Klein. Boston, MA: American Botanical Council, 1998.
  2. 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
  3. Bahijiri, S. M., Mira, S. A., Mufti, A. M., and Ajabnoor, M. A. The effects of inorganic chromium and brewer's yeast supplementation on glucose tolerance, serum lipids and drug dosage in individuals with type 2 diabetes. Saudi.Med.J. 2000;21(9):831-837. DOI
  4. Schrauzer, G. N. and de, Vroey E. Effects of nutritional lithium supplementation on mood. A placebo-controlled study with former drug users. Biol.Trace Elem.Res. 1994;40(1):89-101. PubMed
  5. Gayathri R, Aruna T, Malar S, Shilpa B, Dhanasekar KR. Efficacy of Saccharomyces cerevisiae CNCM I-3856 as an add-on therapy for irritable bowel syndrome. Int J Colorectal Dis. 2020;35(1):139-145. PubMed
  6. Mourey F, Decherf A, Jeanne JF, et al. Saccharomyces cerevisiae I-3856 in irritable bowel syndrome with predominant constipation. World J Gastroenterol 2022;28(22):2509-2522.

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 Brewer's Yeast and Sofosbuvir, Velpatasvir Together: Common Questions

Is it safe to take Brewer's Yeast with Sofosbuvir, Velpatasvir?
We do not list a known interaction between Brewer's Yeast and Sofosbuvir, Velpatasvir. 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 Brewer's Yeast and Sofosbuvir, Velpatasvir have any of the same side effects?
Yes — our sources link each of them separately to 3 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.
How was the Brewer's Yeast and Sofosbuvir, Velpatasvir combination checked?
Interactions in our licensed database are recorded against drug classes. Sofosbuvir, Velpatasvir is filed under 7 classifications, and Brewer's Yeast has documented interactions with 4 drug classes — none of Sofosbuvir, Velpatasvir's classifications are among them. A medication can belong to classes beyond those recorded in our dataset, so this describes how the check was run rather than guaranteeing safety.
Does Brewer's Yeast interact with any other medications?
Yes. Brewer's Yeast has 136 documented drug interactions in our database — Sofosbuvir, Velpatasvir is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.
Does Sofosbuvir, Velpatasvir interact with any supplements?
Yes. Sofosbuvir, Velpatasvir has documented interactions with 147 supplements in our database — Brewer's Yeast is not one of them. The Sofosbuvir, Velpatasvir 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

Brewer's Yeast monograph Uses, safety profile, and every drug interaction in one place Sofosbuvir and Velpatasvir drug information The full plain-English guide to this medication Sofosbuvir, Velpatasvir supplement interactions Every supplement checked against Sofosbuvir, Velpatasvir, 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 6 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Sofosbuvir, Velpatasvir 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.