Drug & supplement interaction

Quebracho Blanco + Bismuth Subsalicylate (OTC drug)

Bismuth Subsalicylate (OTC drug) brand names: Pepto-Bismol, Kaopectate Anti-Diarrheal Caplets (U.S.), Maalox Total Stomach Relief, Maalox Multi Action, Kaopectate Liquid (U.S.), and others.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Oct 4, 2026
The bottom line No known interaction

We found no known interaction between Quebracho Blanco and Bismuth Subsalicylate (OTC drug) 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.

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Interaction report

Quebracho Blanco and Bismuth Subsalicylate (OTC drug)

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 Bismuth Subsalicylate (OTC drug) and Quebracho Blanco 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 Quebracho Blanco at all — not against Bismuth Subsalicylate (OTC drug), 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.

Quebracho Blanco safety at a glance

Quebracho Blanco overall Use caution Limited human safety data and the bark contains active alkaloids, so use cautiously.
Pregnancy Avoid Not enough safety information; avoid use during pregnancy.
Breastfeeding Avoid No reliable safety data, so avoid while breastfeeding.

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

Still wondering about combining Bismuth Subsalicylate (OTC drug) and Quebracho Blanco? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

What Quebracho Blanco Itself Has Been Linked To

This is not an interaction — nothing below involves Bismuth Subsalicylate (OTC drug). It is the side-effect record for Quebracho Blanco on its own, from the licensed Natural Medicines monograph. If something new turns up after you add Quebracho Blanco, this list is the first place to look.

  • Sweating Additional detail

    “Orally, quebracho blanco seems to be well tolerated. However, a thorough evaluation of safety outcomes has not been conducted. Some people who take quebracho blanco bark may experience salivation, headache, outbreaks of sweating, vertigo, stupor, and drowsiness. In large doses, it can cause nausea and vomiting (18).”

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

    1 source cited
    1. 18. Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.
  • Drowsiness / Dizziness / Headache Additional detail

    “Orally, quebracho blanco bark may cause headache, vertigo, stupor, and drowsiness (18).”

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

    1 source cited
    1. 18. Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.
  • Vomiting / Nausea Additional detail

    “Orally, quebracho blanco bark may cause salivation. In large doses, it can cause nausea and vomiting (18).”

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

    1 source cited
    1. 18. Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.

Everything above comes from the Natural Medicines adverse-effect record for Quebracho Blanco — expand a row for the licensed statement it rests on. We haven’t matched Bismuth Subsalicylate (OTC drug) to its FDA label in our system yet, so we can’t compare its own side-effect list here — the leaflet that comes with your prescription is the authoritative list for Bismuth Subsalicylate (OTC drug).

From our Q&A

Questions About Quebracho Blanco or Bismuth Subsalicylate (OTC drug)

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Quebracho Blanco or Bismuth Subsalicylate (OTC drug), 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 Bismuth Subsalicylate (OTC drug)

This page covers Quebracho Blanco only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Bismuth Subsalicylate (OTC drug) page lists 17 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Coffee Charcoal (moderate), European Mandrake (moderate), Glucomannan (moderate) and Guar Gum (moderate).

By severity: 1 major · 7 moderate · 9 minor.

From our pharmacist’s overview on the Bismuth Subsalicylate (OTC drug) page

“Everything on this page interacts with bismuth subsalicylate (Pepto-Bismol, Kaopectate) the same basic way, by changing how much of the medicine your gut actually absorbs, and one entry deserves genuine caution. Activated charcoal, the only major-rated interaction of the 17, is another stomach remedy people often take at the same time,…”

Reviewed by 2 · Jul 18, 2026

Open the Bismuth Subsalicylate (OTC drug) interaction page

How much people look this up

Where Quebracho Blanco and Bismuth Subsalicylate (OTC drug) 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 Quebracho Blanco
Top half

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

29 days ago today
Medication Bismuth Subsalicylate (OTC drug)
Top 25%

#519 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 Quebracho Blanco reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified October 4, 2026. The Quebracho Blanco and Bismuth Subsalicylate (OTC drug) 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 Quebracho Blanco

What is Quebracho Blanco?

  • Coughs and breathing problems
  • Asthma and bronchitis symptoms
  • Altitude or shortness of breath
  • Erectile dysfunction (traditional)
  • Fever and digestive upset

Quebracho Blanco is the bark of a South American tree traditionally used for breathing problems and coughs, but high-quality human studies are lacking. It contains alkaloids that may affect blood vessels and breathing, so safety is not well established—talk to your pharmacist or doctor before using it.

Aspidosperma quebracho-blanco · Apocynaceae · Bark · Tincture, liquid extract, dried bark for tea, capsules

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

Quebracho Blanco: dosing

There is no well-established or standardized dose for quebracho blanco. The amount of active alkaloids can vary a lot between products, which makes safe dosing hard to determine.If you choose to use a quebracho product, follow the directions on the label and do not exceed the recommended amount.

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

Read the full Quebracho Blanco monograph & all interactions
Medication

About Bismuth Subsalicylate

What Is Bismuth Subsalicylate Used For?

Brand names: Pepto-Bismol, Kaopectate Anti-Diarrheal Caplets (U.S.), Maalox Total Stomach Relief, Maalox Multi Action, Kaopectate Liquid (U.S.), Kaopectate Extra Strength Liquid (U.S.)

Bismuth subsalicylate is used for diarrhea and traveler's diarrhea. It also relieves upset stomach from overindulgence in food and drink.

That upset stomach can show up as heartburn, indigestion, nausea, gas, belching or a feeling of fullness. A few products (such as some Rite Aid, WinCo, DRx Choice regular strength suspensions and Stomach Relief Maximum Strength liquid) list the symptoms without “fullness.”

See full Bismuth Subsalicylate drug information
Keep checking

Other Drugs & Quebracho Blanco

Browse every other medication we’ve checked against Quebracho Blanco — 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 Quebracho Blanco 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 Quebracho Blanco list.

See the full Quebracho Blanco interactions page
See every supplement checked against Bismuth Subsalicylate (OTC drug), ranked by severity
Evidence & sources

Quebracho Blanco References

The 1 references that drive our Quebracho Blanco 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. Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.

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 Quebracho Blanco and Bismuth Subsalicylate (OTC drug) Together: Common Questions

Is it safe to take Quebracho Blanco with Bismuth Subsalicylate (OTC drug)?
We do not list a known interaction between Quebracho Blanco and Bismuth Subsalicylate (OTC drug). 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.
Does Bismuth Subsalicylate (OTC drug) interact with any supplements?
Yes. Bismuth Subsalicylate (OTC drug) has documented interactions with 17 supplements in our database — Quebracho Blanco is not one of them. The Bismuth Subsalicylate (OTC drug) 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

Quebracho Blanco monograph Uses, safety profile, and every drug interaction in one place Bismuth Subsalicylate drug information The full plain-English guide to this medication Bismuth Subsalicylate (OTC drug) supplement interactions Every supplement checked against Bismuth Subsalicylate (OTC drug), 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 1 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Bismuth Subsalicylate (OTC drug) and Quebracho Blanco?

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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.