Medication interaction hub

What Supplements Interact with Benzocaine, Dextromethorphan?

Benzocaine, Dextromethorphan brand name: Tetra-Formula. Every interaction below applies to the brands too.

24 Interactions 1 Major 20 Moderate 3 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 Benzocaine, Dextromethorphan? 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 Benzocaine, Dextromethorphan 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.

Tetra-Formula pairs benzocaine, a throat-numbing agent, with dextromethorphan, a cough suppressant that raises serotonin activity, and that second ingredient explains why 21 of the 24 supplement interactions on file share one theme, pushing serotonin higher and raising the risk of serotonin syndrome (agitation, racing heart, fever, confusion). This over-the-counter product deserves more caution than most cold remedies. The single major-rated entry is lithium, and everyday products like St. John's wort sit in the moderate group for the same reason.

Twenty of the 24 rate moderate and three minor, but even the moderates matter here, partly because a cough medicine feels too ordinary to question. If you take anything that supports mood or sleep by acting on serotonin, ask your pharmacist about this product first. The remaining three entries involve the benzocaine side, mainly DMSO, which can pull topical drugs deeper through skin and mucous membranes, so do not use the two together.

— , Clinical Pharmacist · July 18, 2026

Major 1 Moderate 20 Minor 3 No known interaction 1,428

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

Benzocaine, Dextromethorphan: Top Interactions at a Glance

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

Showing the 12 highest-ranked of 24 interacting ingredients — plus 1,428 more checked with no known interaction. See the complete ranked list.

Start here

The Major Interactions to Know About

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

Major Likelihood Probable Lithium + Benzocaine, Dextromethorphani

Theoretically, taking lithium supplements with serotonergic drugs might both mask and increase the risk of serotonin syndrome.

Read the full interaction
The complete list

Every Supplement Checked Against Benzocaine, Dextromethorphan

All 1,452 ingredients in our database, ranked by severity — 24 with a Benzocaine, Dextromethorphan interaction on file and 1,428 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 Benzocaine, Dextromethorphan?

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 Black Cohosh with Benzocaine, Dextromethorphan?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Combining serotonergic drugs with black cohosh might cause additive serotonergic effects.

Full Black Cohosh + Benzocaine, Dextromethorphan answer

Can you take Acetyl-l-carnitine with Benzocaine, Dextromethorphan?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, acetyl-L-carnitine might increase the risk of serotonergic side effects, including serotonin syndrome and cerebral vasoconstr...

Full Acetyl-l-carnitine + Benzocaine, Dextromethorphan answer

Can you take Ayahuasca with Benzocaine, Dextromethorphan?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, ayahuasca might increase levels of serotonin, which may have additive effects with serotonergic drugs.

Full Ayahuasca + Benzocaine, Dextromethorphan answer

Can you take Black Seed with Benzocaine, Dextromethorphan?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, combining serotonergic drugs with black seed might increase the risk of serotonergic side effects, including serotonin syndro...

Full Black Seed + Benzocaine, Dextromethorphan answer

Can you take Dimethylsulfoxide (dmso) with Benzocaine, Dextromethorphan?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Topical DMSO might increase the effects and adverse effects of topical drugs.

Full Dimethylsulfoxide (dmso) + Benzocaine, Dextromethorphan answer

Can you take Ergot with Benzocaine, Dextromethorphan?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Certain ergot alkaloids, such as dihydroergotamine, act as serotonin agonists.

Full Ergot + Benzocaine, Dextromethorphan answer

Can you take Fermented Wheat Germ Extract with Benzocaine, Dextromethorphan?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, concomitant use of fermented wheat germ extract with serotonergic medications may increase the risk of serotonergic adverse e...

Full Fermented Wheat Germ Extract + Benzocaine, Dextromethorphan answer

Can you take Garcinia with Benzocaine, Dextromethorphan?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, combining garcinia with other serotonergic drugs might increase the risk of serotonergic side effects, including serotonin sy...

Full Garcinia + Benzocaine, Dextromethorphan answer

Can you take Hawaiian Baby Woodrose with Benzocaine, Dextromethorphan?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, concomitant use may increase the risk for serotonergic adverse effects.

Full Hawaiian Baby Woodrose + Benzocaine, Dextromethorphan answer

Can you take Iboga with Benzocaine, Dextromethorphan?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking iboga with serotonergic drugs might increase levels of serotonin, resulting in additive effects with serotonergic drug...

Full Iboga + Benzocaine, Dextromethorphan answer

Can you take Kratom with Benzocaine, Dextromethorphan?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking kratom in combination with serotonergic drugs may increase levels of serotonin, increasing the risk of serotonin syndr...

Full Kratom + Benzocaine, Dextromethorphan answer

Can you take L-tryptophan with Benzocaine, Dextromethorphan?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, combining L-tryptophan with serotonergic drugs might cause additive serotonergic effects.

Full L-tryptophan + Benzocaine, Dextromethorphan answer

Can you take Methylene Blue with Benzocaine, Dextromethorphan?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Combining serotonergic drugs with methylene blue can cause additive serotonergic effects, including serotonin syndrome.

Full Methylene Blue + Benzocaine, Dextromethorphan answer

Can you take Phenethylamine (pea) with Benzocaine, Dextromethorphan?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, combining serotonergic drugs with phenethylamine might increase the risk of serotonergic adverse effects.

Full Phenethylamine (pea) + Benzocaine, Dextromethorphan answer

Can you take Psilocybin with Benzocaine, Dextromethorphan?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, combining psilocybin with serotonergic drugs might cause additive serotonergic effects.

Full Psilocybin + Benzocaine, Dextromethorphan answer

Can you take Same with Benzocaine, Dextromethorphan?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Taking SAMe with serotonergic drugs might increase the risk of serotonin syndrome and other serotonergic side effects.

Full Same + Benzocaine, Dextromethorphan answer

Can you take St. John's Wort with Benzocaine, Dextromethorphan?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, St.

Full St. John's Wort + Benzocaine, Dextromethorphan answer

Can you take Syrian Rue with Benzocaine, Dextromethorphan?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, Syrian rue might increase the risk of serotonergic adverse effects, including serotonin syndrome, when taken with serotonergi...

Full Syrian Rue + Benzocaine, Dextromethorphan answer

Can you take Turpentine Oil with Benzocaine, Dextromethorphan?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Some in vitro research shows that alpha-pinene, the major constituent of turpentine oil, does not increase the absorption of chlorpromazine...

Full Turpentine Oil + Benzocaine, Dextromethorphan answer

Can you take Alchemilla with Benzocaine, Dextromethorphan?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. While no side effects have been reported from orally using Alchemilla, a clinical study titled "Treatment of Aphthous Stomatitis with Topica...

Full Alchemilla + Benzocaine, Dextromethorphan 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) Benzocaine, Dextromethorphan is classified into the pharmacology categories it belongs to, (2) every supplement interaction documented against any of those categories is inherited by Benzocaine, Dextromethorphan, 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.

Benzocaine, Dextromethorphan sits in 3 interaction categories. Open any one to see what the group means:

Serotonergic Drugs 20 ingredients

Medications that raise serotonin activity. Combining them with serotonin-active supplements can, in rare cases, push serotonin too high.

20 of the supplement ingredients on this page reach Benzocaine, Dextromethorphan through this category.

Topical Drugs 3 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.

3 of the supplement ingredients on this page reach Benzocaine, Dextromethorphan through this category.

Serotonergic Drugs 1 ingredient

Medications that raise serotonin activity. Combining them with serotonin-active supplements can, in rare cases, push serotonin too high.

1 of the supplement ingredient on this page reaches Benzocaine, Dextromethorphan through this category.

Check a real product

Take a Supplement Product? Check the Whole Bottle Against Benzocaine, Dextromethorphan

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 Benzocaine, Dextromethorphan.

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Products that contain Benzocaine, Dextromethorphan-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 Benzocaine, Dextromethorphan.

SHRED Tropic Heat by Core Nutritionals contains Acetyl-l-carnitine Strong Bones by Herbal Terra contains Black Cohosh Natural Changes by Nature's Sunshine contains Black Cohosh Menopause Support for Women by Stonehenge Health contains Black Cohosh David Winston's Women's Transition Compound by Herbalist & Alchemist contains Black Cohosh
Pharmacist Counseling Corner

Benzocaine, Dextromethorphan & Supplements: Common Questions

What supplements interact with Benzocaine, Dextromethorphan?
More than you might expect — 24 in total, though they are far from equal: 1 are rated major, 20 moderate, and 3 minor. The ranked list on this page puts the ones that genuinely matter first, and every entry opens a full report on that exact pair. The highest-ranked right now: Lithium, 5-htp, Acetyl-l-carnitine.
Which Benzocaine, Dextromethorphan supplement interactions are the most serious?
Focus on the major group: Lithium. 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 Benzocaine, Dextromethorphan?
Usually yes — most people on Benzocaine, Dextromethorphan can take most supplements. The catch is the exceptions, and they aren't always the exotic ones (St. John's Wort trips up more prescriptions than almost anything sold next to it). Look up each ingredient you actually take in the list above, and treat "no known interaction" as a green-ish light, not a guarantee. Try the label scanner or the interaction checker.
Do brands like Tetra-Formula have the same supplement interactions as Benzocaine, Dextromethorphan?
Yes — Tetra-Formula all contain Benzocaine, Dextromethorphan, 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 Benzocaine, Dextromethorphan and my other medications?
This page covers Benzocaine, Dextromethorphan against supplements and herbal ingredients. Checking Benzocaine, Dextromethorphan 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 , 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.