Medication interaction hub

What Supplements Interact with Guaifenesin?

Guaifenesin brand names: Robitussin, Humibid LA, Amibid LA, Numobid, Muco-Fen 800, and others. Every interaction below applies to the brands too.

26 Interactions 2 Major 15 Moderate 9 Minor
Curated & coded by · Clinical Pharmacist · Updated September 22, 2026

Drug–supplement interaction data sourced from Natural Medicines Pro, the licensed clinical database from TRC Healthcare / Therapeutic Research, with additional analysis by the HelloPharmacist Pharmacist Team. Our sources · Editorial policy

What is this page for?

One answer, for one medication: what supplements and herbal products interact with Guaifenesin? Every vitamin, herb, and supplement ingredient we’ve checked against it is on this page, ranked by severity, each linking to the full report for that exact pair.

This page covers supplement interactions only — to check Guaifenesin against your other medications, use the drug–drug interaction checker. Educational information from our licensed clinical databases, not medical advice. Our editorial policy

HelloPharmacist Bottom Line
Our Pharmacist Explains
What is this? The interaction data in the HelloPharmacist supplement database is licensed from Natural Medicines Pro by TRC Healthcare (Therapeutic Research). HelloPharmacist pharmacists often add our own analysis and context on top of that licensed data — such as this Bottom Line summary and the notes on individual interaction pages — and any such commentary is noted as ours.

Guaifenesin (Robitussin, Humibid LA) loosens chest mucus, and by itself it is a mild medicine, but two of the 26 supplements on this list rate major, so those two deserve your attention first. Activated charcoal can bind the drug in your gut and blunt what it does, and grapefruit raises blood levels of dextromethorphan, the cough suppressant paired with guaifenesin in Robitussin DM and many combination products.

The 15 moderate entries split into two groups. Fibers and gums such as glucomannan and slippery elm can slow or reduce absorption of whatever you swallow, so keep them well separated from your dose. Berberine herbs like goldenseal push dextromethorphan levels higher, which can show up as extra drowsiness or confusion, and 5-HTP adds a serotonin risk on top. The nine minors are mostly milder absorption effects. Check your label, since plain guaifenesin without dextromethorphan sidesteps roughly a third of this list.

— , Clinical Pharmacist · July 18, 2026

Major 2 Moderate 15 Minor 9 No known interaction 1,426

This box checks one ingredient at a time (like turmeric or magnesium). Taking a supplement product with a whole label of ingredients? Search the product instead — we check every ingredient on it ↓

Top Ingredient Interactions

Guaifenesin: Top Interactions at a Glance

The most significant Guaifenesin supplement & herbal interactions, colored by severity. Tap any ingredient to open the full report for that pair.

Showing the 12 highest-ranked of 26 interacting ingredients — plus 1,426 more checked with no known interaction. See the complete ranked list.

Start here

The Major Interactions to Know About

The most clinically significant Guaifenesin + supplement combinations in our database, best-documented first. Open any card for the full report.

Major Likelihood Probable Activated Charcoal + Guaifenesini

Activated charcoal reduces systemic exposure to many drugs, including those that undergo enterohepatic recirculation, regardless of the route of administration.

Read the full interaction Major Likelihood Probable Grapefruit + Guaifenesini

Grapefruit juice can increase blood levels of dextromethorphan, potentially increasing the effects and adverse effects of dextromethorphan.

Read the full interaction
The complete list

Every Supplement Checked Against Guaifenesin

All 1,452 ingredients in our database, ranked by severity — 26 with a Guaifenesin interaction on file and 1,426 with none found. Filter by severity or search any ingredient; hover the for what each ingredient is.

Looking for an interaction with a specific supplement product? Search products instead ↓

Straight answers

Can You Take It With Guaifenesin?

One-line answers, one card per combination — scroll through today’s 20 and tap any card for the full report. A different set rotates in daily until every combination has had its turn.

Can you take Grapefruit with Guaifenesin?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. Grapefruit juice can increase blood levels of dextromethorphan, potentially increasing the effects and adverse effects of dextromethorphan.

Full Grapefruit + Guaifenesin answer

Can you take Thyroid Extract with Guaifenesin?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Food and medications can interfere with thyroid hormone absorption.

Full Thyroid Extract + Guaifenesin answer

Can you take Agar with Guaifenesin?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Agar forms a thick gel, which may disrupt the absorption of nutrients and medications.

Full Agar + Guaifenesin answer

Can you take Algin with Guaifenesin?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Theoretically, algin can alter the absorption of oral drugs.

Full Algin + Guaifenesin answer

Can you take Black Psyllium with Guaifenesin?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Theoretically, psyllium might increase, decrease, or have no effect on the absorption of oral drugs.

Full Black Psyllium + Guaifenesin answer

Can you take Blond Psyllium with Guaifenesin?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Theoretically, psyllium might increase, decrease, or have no effect on the absorption of oral drugs.

Full Blond Psyllium + Guaifenesin answer

Can you take Carob with Guaifenesin?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Theoretically, carob might also impair the absorption of oral drugs.

Full Carob + Guaifenesin answer

Can you take Karaya Gum with Guaifenesin?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Co-administration of oral drugs with bulk forming laxatives such as karaya gum may decrease, increase, or have no effect on the absorption o...

Full Karaya Gum + Guaifenesin answer

Can you take Marshmallow with Guaifenesin?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Theoretically, mucilage in marshmallow might impair absorption of oral drugs.

Full Marshmallow + Guaifenesin answer

Can you take Xanthan Gum with Guaifenesin?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Theoretically, xanthan gum can alter the absorption of oral drugs due to its fiber qualities.

Full Xanthan Gum + Guaifenesin answer

Can you take Activated Charcoal with Guaifenesin?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. Activated charcoal reduces systemic exposure to many drugs, including those that undergo enterohepatic recirculation, regardless of the rout...

Full Activated Charcoal + Guaifenesin answer

Can you take Coffee Charcoal with Guaifenesin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Coffee charcoal can reduce the absorption of orally administered drugs and should be separated from oral drug administration by at least two...

Full Coffee Charcoal + Guaifenesin answer

Can you take European Mandrake with Guaifenesin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, concurrent use might increase absorption of some drugs because of inhibited gastrointestinal (GI) motility caused by European...

Full European Mandrake + Guaifenesin answer

Can you take Glucomannan with Guaifenesin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, glucomannan may decrease absorption of drugs taken orally.

Full Glucomannan + Guaifenesin answer

Can you take Berberine with Guaifenesin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, berberine may increase serum levels of dextromethorphan.

Full Berberine + Guaifenesin answer

Can you take Bitter Orange with Guaifenesin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Bitter orange might increase blood levels of dextromethorphan.

Full Bitter Orange + Guaifenesin answer

Can you take Corydalis Yanhusuo with Guaifenesin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, Corydalis yanhusuo may increase serum levels of dextromethorphan.

Full Corydalis Yanhusuo + Guaifenesin answer

Can you take Goldenseal with Guaifenesin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, goldenseal might increase serum levels of dextromethorphan.

Full Goldenseal + Guaifenesin answer

Can you take Griffonia Simplicifolia with Guaifenesin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking Griffonia simplicifolia seed extract with dextromethorphan might increase the risk of serotonergic adverse effects, su...

Full Griffonia Simplicifolia + Guaifenesin answer

Can you take Guar Gum with Guaifenesin?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Guar gum might reduce the absorption of some oral drugs, potentially decreasing their effectiveness.

Full Guar Gum + Guaifenesin answer
Read the list like a pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

  • Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
  • Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
  • Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
  • No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

  • Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
  • Probable. Interaction 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.
  • Possible. 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
  • Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

  • Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
  • Each entry links to a full report with the clinical detail, likelihood, evidence level, and citations for that exact combination.
  • Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

How Does Our Interaction Checker Work?

Behind every verdict on this page is a category system. Our source database doesn’t document supplement interactions drug-by-drug — it documents them against groups of medications that behave the same way (for example, “drugs processed by the CYP3A4 liver enzyme” or “blood-thinning medications”).

So the check works in three steps: (1) Guaifenesin is classified into the pharmacology categories it belongs to, (2) every supplement interaction documented against any of those categories is inherited by Guaifenesin, and (3) each ingredient keeps its own severity, likelihood, and evidence grades from the underlying record. That’s why one supplement can carry several records for one drug — it may interact through more than one category.

Guaifenesin sits in 2 interaction categories. Open any one to see what the group means:

Oral Drugs 17 ingredients

A pharmacology grouping from our source database: medications in this group share a property that certain supplements are known to interact with, so an interaction documented for the group applies to every drug in it.

17 of the supplement ingredients on this page reach Guaifenesin through this category.

Dextromethorphan (Robitussin Dm, Others) 9 ingredients

A pharmacology grouping from our source database: medications in this group share a property that certain supplements are known to interact with, so an interaction documented for the group applies to every drug in it.

9 of the supplement ingredients on this page reach Guaifenesin through this category.

About Guaifenesin

Guaifenesin is an expectorant used to relieve chest congestion by helping you cough up mucus.

Generic name: Guaifenesin  ·  Brand names: Robitussin, Humibid LA, Amibid LA, Numobid, Muco-Fen 800, Bidex, Organidin, X-pect, Mucinex.

See the full Guaifenesin drug information
Check a real product

Take a Supplement Product? Check the Whole Bottle Against Guaifenesin

Most supplements are combination products — and the interaction may come from an ingredient you didn’t buy it for. Search any product below (or scan its label) and we’ll check every ingredient on it against Guaifenesin.

Search a supplement product

Type a product name, brand, or UPC — smart search across our full catalog.

Grounded search over our product catalog — every verdict comes from our interaction database, never AI guesswork. How we use AI

Or scan the bottle

Photograph any Supplement Facts panel — we read the ingredients and check each one against your medications. Free, in seconds.

Open the label scanner

Prefer typing? The interaction checker looks up products by name too.

Products that contain Guaifenesin-interacting ingredients

Real supplements from the NIH label database that contain the top interacting ingredients on this page — each one is worth a full label check before combining with Guaifenesin.

Yeast-Cleanse by Solaray contains Grapefruit Ultimate GCB by M3 Supplement Company contains Grapefruit Neuro Health by Nature’s Craft contains Grapefruit NDF Happy Peach by Bioray Kids contains Grapefruit
Pharmacist Counseling Corner

Guaifenesin & Supplements: Common Questions

What supplements interact with Guaifenesin?
Our database currently documents 26 ingredients with a known Guaifenesin interaction (2 major, 15 moderate, 9 minor). The practical move: scan the major group first, then look up the exact supplements you take rather than reading all 26. The highest-ranked right now: Activated Charcoal, Grapefruit, Coffee Charcoal.
Which Guaifenesin supplement interactions are the most serious?
Focus on the major group: Activated Charcoal and Grapefruit. A major rating means the combination can be clinically significant, not that harm is guaranteed — but it's exactly the kind of thing to run past your pharmacist before your next dose, not after. Jump to the ranked list.
Can I take vitamins or supplements while on Guaifenesin?
Plenty of supplements coexist fine with Guaifenesin; a shorter list does not. Rather than memorizing it, check the specific ingredients on your labels — the ranked list above covers every one we've checked, and multi-ingredient products can be checked label-by-label with our scanner. Try the label scanner or the interaction checker.
Do brands like Robitussin have the same supplement interactions as Guaifenesin?
Yes — Robitussin, Humibid LA, Amibid LA, Numobid, Muco-Fen 800 and other brands all contain Guaifenesin, so everything on this page applies to them equally. Interactions belong to the active drug, never to the brand on the box; the same is true of generics.
Where do these interaction ratings come from?
Every rating comes from the Natural Medicines database — the same evidence-graded reference pharmacists and hospitals use — and each interaction carries three separate grades: severity (how bad it can be), likelihood (how well it's documented in studies and case reports), and an evidence level. Our pharmacists review the content; we never let an AI decide an interaction. See how to read the ratings and our editorial policy.
What about Guaifenesin and my other medications?
This page covers Guaifenesin against supplements and herbal ingredients. Checking Guaifenesin against your other prescription or OTC medications is a different tool — our drug interaction checker covers that side. Head to the drug–drug interaction checker, or read the full Guaifenesin drug information.

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

Where next

More Free Pharmacist Tools

Supplement interaction checker Check any supplement or product against your medications Supplement label scanner Photograph a Supplement Facts panel; we check every ingredient Browse medications A–Z Every drug we’ve checked against herbs & supplements Ingredient directory Every vitamin, herb & mineral we track, with interaction data Product directory Look up any bottle by name, brand, or barcode Ask a pharmacist Free, personal answer from our licensed team
Sourcing

Where This Data Comes From — and Why You Can Trust It

🧪 Licensed clinical database

Every interaction verdict on this page comes from Natural Medicines Pro (TRC Healthcare / Therapeutic Research) — the same evidence-graded reference used by pharmacists and hospitals. We license this data directly; we do not scrape it, and no AI invents an interaction.

🧑‍⚕️ Pharmacist review

This page is curated and coded by , Clinical Pharmacist, with additional analysis by the HelloPharmacist Pharmacist Team. Editorial commentary is ours; the licensed interaction records are shown as sourced.

🔄 Kept current

Our interaction database refreshes on a weekly cycle, and this page re-checks the live database every time it’s rebuilt — what you see reflects the database as of September 22, 2026.

🔍 Full transparency

How every dataset on this site is sourced, licensed, and updated is documented publicly: our data sources · editorial policy · how we use AI.

Educational information, not medical advice. An interaction being on file does not mean it will happen to you — and absence of one is not proof of safety. Never start or stop a medication or supplement without talking to your pharmacist or doctor.