Medication interaction hub
What Supplements Interact with acetaminophen, dextromethorphan, phenylephrine, guaifenesin?
acetaminophen, dextromethorphan, phenylephrine, guaifenesin brand name: DayQuil Severe. Every interaction below applies to the brands too.
1 Interaction
1 Minor
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 acetaminophen, dextromethorphan, phenylephrine, 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 acetaminophen, dextromethorphan, phenylephrine, 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.People fighting off a cold with DayQuil Severe (acetaminophen, dextromethorphan, phenylephrine, guaifenesin) are often the same people dosing themselves with echinacea, and that pairing is the only supplement interaction on record here, rated minor and considered unlikely to matter. Echinacea can nudge the liver enzymes that break down the acetaminophen and dextromethorphan in this formula, but the research points in both directions and no meaningful change has been demonstrated in people. For most, this is about as calm as an interaction list gets.
A single minor entry is still not a promise of safety, since combination cold medicines tend to get layered on top of whatever else is already in the cabinet. Letting your pharmacist know about herbal products alongside your cold remedy covers that gap. Echinacea earns its spot on this page mostly because people reach for it at exactly the moment they reach for a product like this one.
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 ↓
The complete list
Every Supplement Checked Against acetaminophen, dextromethorphan, phenylephrine, guaifenesin
All 1,452 ingredients in our database, ranked by severity — 1 with a acetaminophen, dextromethorphan, phenylephrine, guaifenesin interaction on file and 1,451 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 ↓
1,452 ingredients
No ingredients match “”.
EchinaceaAmerican Cone Flower, black Sampson, black Susans, +7 more Unlikely
What it is: Echinacea is a popular herb taken to help prevent or shorten the common cold, but study results are mixed and the overall benefit appears sm...
Echinacea is reported to have varying effects on a number of Cytochrome P450 metabolizing enzymes in the liver, including CYP1A2 and CYP3A4, which play a role in acetaminophen and dextromethorphan metabolism (both contained in DayQuil Severe), respectively.
Read the full Echinacea + acetaminophen, dextromethorphan, phenylephrine, guaifenesin interaction
Straight answers
Can You Take It With acetaminophen, dextromethorphan, phenylephrine, guaifenesin?
One-line answers, one card per combination — scroll through today’s 1 and tap any card for the full report. A different set rotates in daily until every combination has had its turn.
Can you take Echinacea with acetaminophen, dextromethorphan, phenylephrine, guaifenesin?
Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Echinacea is reported to have varying effects on a number of Cytochrome P450 metabolizing enzymes in the liver, including CYP1A2 and CYP3A4,...
Full Echinacea + acetaminophen, dextromethorphan, phenylephrine, 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) acetaminophen, dextromethorphan, phenylephrine, guaifenesin is classified into the pharmacology categories it belongs to, (2) every supplement interaction documented against any of those categories is inherited by acetaminophen, dextromethorphan, phenylephrine, 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.
acetaminophen, dextromethorphan, phenylephrine, guaifenesin sits in 1 interaction category. Open any one to see what the group means:
Dayquil Severe (Cyp1A2, Cyp3A4 Substrates) 1 ingredient
A drug-metabolism group: these medications are processed by the named liver enzyme (a cytochrome P450). Supplements that speed this enzyme up or slow it down can lower or raise the medication's levels in your body.
1 of the supplement ingredient on this page reaches acetaminophen, dextromethorphan, phenylephrine, guaifenesin through this category.
Check a real product
Take a Supplement Product? Check the Whole Bottle Against acetaminophen, dextromethorphan, phenylephrine, 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 acetaminophen, dextromethorphan, phenylephrine, guaifenesin.
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Products that contain acetaminophen, dextromethorphan, phenylephrine, 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 acetaminophen, dextromethorphan, phenylephrine, guaifenesin.
Pharmacist Counseling Corner
acetaminophen, dextromethorphan, phenylephrine, guaifenesin & Supplements: Common Questions
What supplements interact with acetaminophen, dextromethorphan, phenylephrine, guaifenesin?
In our interaction database, 1 supplement and herbal ingredients have an interaction with acetaminophen, dextromethorphan, phenylephrine, guaifenesin on file — 0 rated major, 0 moderate, and 1 minor. That number sounds scarier than it is: severity matters far more than the count, which is why the list on this page is ranked instead of alphabetical. Start at the top. The highest-ranked right now: Echinacea.
Which acetaminophen, dextromethorphan, phenylephrine, guaifenesin supplement interactions are the most serious?
None of the acetaminophen, dextromethorphan, phenylephrine, guaifenesin supplement interactions on file are currently rated major. The most significant are rated minor. Still worth a quick look through the ranked list for anything you take daily. Jump to the ranked list.
Can I take vitamins or supplements while on acetaminophen, dextromethorphan, phenylephrine, guaifenesin?
That depends entirely on which supplement. The honest answer for acetaminophen, dextromethorphan, phenylephrine, guaifenesin is in the ranked list above — and if what you take is a combination product with a dozen ingredients, don't check them one by one: photograph the label with our scanner and we'll check the whole thing at once. Try the label scanner or the interaction checker.
Do brands like DayQuil Severe have the same supplement interactions as acetaminophen, dextromethorphan, phenylephrine, guaifenesin?
Yes — DayQuil Severe all contain acetaminophen, dextromethorphan, phenylephrine, 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 acetaminophen, dextromethorphan, phenylephrine, guaifenesin and my other medications?
This page covers acetaminophen, dextromethorphan, phenylephrine, guaifenesin against supplements and herbal ingredients. Checking acetaminophen, dextromethorphan, phenylephrine, 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.
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
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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 Dr. Brian Staiger, PharmD, BCPS, 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.