Drug & supplement interaction

Xanthan Gum + Famotidine

Famotidine brand names: Pepcid, Famotidine, Pepcid AC, Famotidine Injection.

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

Xanthan Gum has a minor interaction with Famotidine. Theoretically, xanthan gum can alter the absorption of oral drugs due to its fiber qualities.

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

Xanthan Gum and Famotidine

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

Minor

ORAL DRUGS

Why this applies to Famotidine

Famotidine falls under ORAL DRUGS — the group Xanthan Gum interacts with.

Theoretically, xanthan gum can alter the absorption of oral drugs due to its fiber qualities. Xanthan gum slows gastric emptying and has been used to control the release of drugs in tablet formulations. To avoid any alterations in drug absorption, xanthan gum should be taken 30-60 minutes after oral medications.
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 gist with famotidine (Pepcid) and xanthan gum. Because xanthan gum forms a thick gel in your stomach, it can slow how fast things empty out and may, in theory, slow down or slightly reduce how much famotidine your body absorbs. If that happened, your acid-blocking medicine might work a touch less reliably, meaning more heartburn or stomach discomfort sneaking through.

I want to be honest with you: this is a theoretical concern based on how fiber behaves, not something proven to cause real problems. It's rated minor. The simple fix is good timing. Take your famotidine first, then wait about 30 to 60 minutes before having the xanthan gum. If you use it daily as a thickener, just mention it to your pharmacist so you can space things sensibly.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Osilesi O, Trout DL, Glover EE, et al. Use of xanthan gum in dietary management of diabetes mellitus. Am J Clin Nutr 1985;42: 597-603. PubMed
  2. Beneke CE, Viljoen AM, Hamman JH. Polymeric plant-derived excipients in drug delivery. Molecules. 2009;14(7):2602-20. 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

Xanthan Gum Also Interacts With Other Medications

Xanthan Gum has 2,021 minor known drug interactions in our database — the Famotidine one above is one of them. If you take anything else, check it against the full list below.

Minor 2,021 No known interaction 809 (incl. Famotidine)
Taking anything else?

Check Another of Your Medications Against Xanthan Gum

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

From our Q&A

Questions About Xanthan Gum or Famotidine

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Xanthan Gum or Famotidine, 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 Famotidine

This page covers Xanthan Gum only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Famotidine page lists 41 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), African Wild Potato (moderate), Banderol (moderate), Beer (moderate) and Biofeedback (moderate).

By severity: 1 major · 19 moderate · 21 minor.

From our pharmacist’s overview on the Famotidine page

“Famotidine (Pepcid) treats heartburn and acid reflux, a low-stakes job most days, but its interaction list earns genuine caution because one entry is rated major. That entry is activated charcoal, which can bind famotidine in the gut and sharply cut how much of the drug reaches your blood.”

Reviewed by 2 · Jul 18, 2026

Open the Famotidine interaction page

One more smart check

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

We hold 260 real supplement products containing Xanthan Gum, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Xanthan Gum. Your product may carry other ingredients that interact with Famotidine too, on top of Xanthan Gum — 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 Xanthan Gum and Famotidine 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 Xanthan Gum
Top 25%

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

29 days ago today
Medication Famotidine
Top 25%

#289 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 Xanthan Gum

What is Xanthan Gum?

Xanthan Gum
  • Food thickener and stabilizer
  • Bulk-forming laxative
  • Thickening liquids for swallowing problems
  • Gluten-free baking aid
  • Blood sugar support (limited evidence)

Xanthan gum is a fermentation-made fiber widely used to thicken and stabilize foods and to thicken liquids for people with swallowing difficulties. It is generally recognized as safe in the small amounts found in food, but large doses can cause gas, bloating, and loose stools. Talk to your pharmacist or doctor before using it for any medical purpose.

Read the full Xanthan Gum monograph & all interactions
Medication

About Famotidine

What Is Famotidine Used For?

Brand names: Pepcid, Famotidine, Pepcid AC, Famotidine Injection

Famotidine treats a range of acid-related conditions. Over-the-counter tablet products — including Acid Controller, Acid Reducer, Acid Relief, Amazon Basic Care Acid Reducer, basic care acid reducer, and Calmicid AC — are used to relieve and prevent heartburn associated with acid indigestion and sour stomach.

Prescription-strength famotidine tablets and oral suspension are indicated for active duodenal ulcers (ulcers in the small intestine), active gastric ulcers (stomach ulcers), GERD (acid reflux disease), erosive esophagitis (acid-damaged esophagus), and pathological hypersecretory conditions such as Zollinger-Ellison syndrome. The oral suspension is also indicated in children from birth onward for GERD and, in children one year and older, for peptic ulcer disease. Famotidine injection is used in hospitalized patients who cannot take medication by mouth.

See full Famotidine drug information
Keep checking

Other Drugs & Xanthan Gum

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

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

2,021 interactions

Showing 60 of 2,021 minor interactions — see all 2,021 on the Xanthan Gum page.

No interaction 808 drugs checked — show the list

We also checked Xanthan Gum 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 Xanthan Gum list.

See the full Xanthan Gum interactions page
See every supplement checked against Famotidine, 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
Xanthan Gum monograph › Uses, safety, and every drug interaction in one place Famotidine supplement interactions › Every supplement checked against Famotidine, ranked by severity Famotidine 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 Xanthan Gum and Famotidine Together: Common Questions

Can you take Xanthan Gum with Famotidine?
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 Xanthan Gum and Famotidine 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 Famotidine and Xanthan Gum?

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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.