Drug & supplement interaction

Tragacanth + 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.

Moderate Interaction
Medically reviewed by · Updated October 2026
The bottom line Moderate

Tragacanth has a moderate interaction with Bismuth Subsalicylate (OTC drug). Theoretically, tragacanth might alter absorption of oral drugs.

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

Tragacanth and Bismuth Subsalicylate (OTC drug)

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

Moderate

ORAL DRUGS

Why this applies to Bismuth Subsalicylate (OTC drug)

Bismuth Subsalicylate (OTC drug) falls under ORAL DRUGS — the group Tragacanth interacts with.

Theoretically, tragacanth might alter absorption of oral drugs.
Tragacanth contains hydrocolloidal fiber which can decrease, increase, or not affect oral drug absorption. To avoid changes in absorption, take tragacanth 30-60 minutes after oral medications.
Severity Moderate 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 simple version: tragacanth is a plant gum that swells into a thick, slippery gel when it hits fluid. When you swallow it alongside Pepto-Bismol or another bismuth subsalicylate product, that gel could trap some of the medicine and change how much your gut soaks up. It might slow it down, lessen it, or have no real effect. This is a theoretical concern based on how the fiber behaves, not something proven in studies, so I wouldn't lose sleep over it.

The practical worry would be slightly weaker relief from your diarrhea, heartburn, or upset stomach. An easy fix is spacing them out: take your bismuth first, then wait about 30 to 60 minutes before the tragacanth. If you have questions, your pharmacist is happy to help.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Brinker F. Herb Contraindications and Drug Interactions. 2nd ed. Sandy, OR: Eclectic Medical Publications, 1998.

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

Tragacanth Also Interacts With Other Medications

Tragacanth has 2,021 moderate known drug interactions in our database — the Bismuth Subsalicylate (OTC drug) one above is one of them. If you take anything else, check it against the full list below.

Moderate 2,021 No known interaction 809 (incl. Bismuth Subsalicylate (OTC drug))
Taking anything else?

Check Another of Your Medications Against Tragacanth

Covers the 2,830 medications we’ve checked against Tragacanth. Pick one to open its full report.

From our Q&A

Questions About Tragacanth 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 Tragacanth 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 Tragacanth 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

One more smart check

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

We hold 34 real supplement products containing Tragacanth, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Tragacanth. Your product may carry other ingredients that interact with Bismuth Subsalicylate (OTC drug) too, on top of Tragacanth — 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 Tragacanth 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 Tragacanth
Top half

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

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

#521 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 Tragacanth

What is Tragacanth?

Tragacanth
  • Soothing sore throat and cough
  • Digestive upset and constipation
  • Thickening or binding agent in products
  • Skin soothing in creams and pastes

Tragacanth is a plant gum used mainly as a thickener and emulsifier in foods, cosmetics, and medicines, and traditionally to soothe the throat and gut. There is very little solid human research showing it treats any specific condition. It is generally considered safe in food amounts, but anyone with allergies or who is pregnant or breastfeeding should check with a pharmacist or doctor first.

Read the full Tragacanth 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 & Tragacanth

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

0Major
2,021Moderate
0Minor
808No known interaction
2,021 Moderate 808 No interaction
Moderate

2,021 interactions

Showing 60 of 2,021 moderate interactions — see all 2,021 on the Tragacanth page.

No interaction 808 drugs checked — show the list

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

Showing the 60 most looked-up of 808 medications checked with no known interaction — see the full Tragacanth list.

See the full Tragacanth interactions page
See every supplement checked against Bismuth Subsalicylate (OTC drug), 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
Tragacanth monograph › Uses, safety, and every drug interaction in one place Bismuth Subsalicylate (OTC drug) supplement interactions › Every supplement checked against Bismuth Subsalicylate (OTC drug), ranked by severity Bismuth Subsalicylate 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 Tragacanth and Bismuth Subsalicylate (OTC drug) Together: Common Questions

Can you take Tragacanth with Bismuth Subsalicylate (OTC drug)?
There is a moderate interaction, so it may be acceptable with monitoring or timing changes — but check with your pharmacist first. Read the full details on this page and confirm with your pharmacist before combining them.
How serious is the Tragacanth and Bismuth Subsalicylate (OTC drug) interaction?
We rate it Moderate. This combination may require monitoring, a dose adjustment, or separating the times you take each one. Consult your pharmacist before using them together.

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

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

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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.