Drug & supplement interaction

Marsh Labrador Tea + Reslizumab

Reslizumab brand name: Cinqair.

No Known Interaction
Medically reviewed by · Updated October 2026 · Pair last verified Oct 4, 2026
The bottom line No known interaction

We found no known interaction between Marsh Labrador Tea and Reslizumab in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first.

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Interaction report

Marsh Labrador Tea and Reslizumab

We checked these two against our interaction database. Here is what we found.

No Known Interaction Found

We did not find a documented interaction between Reslizumab and Marsh Labrador Tea in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.

If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.

Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.

Marsh Labrador Tea safety at a glance

Marsh Labrador Tea overall Use caution The plant contains toxic grayanotoxins, so any internal use carries a risk of poisoning.
Pregnancy Likely Unsafe When used orally; avoid using. Marsh Labrador tea is considered to be a potential uterine stimulant and abortifacient. Read the full pregnancy detail
Breastfeeding Avoid Not enough safety data and it contains potentially toxic substances, so avoid use.

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center) — the full detail is in the Special populations card below. Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Reslizumab and Marsh Labrador Tea? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
Keep it in perspective

Marsh Labrador Tea Does Interact With Other Medications

Marsh Labrador Tea has 248 moderate known drug interactions in our database — Reslizumab isn’t one of them. If you take anything else, check it against the full list below.

Moderate 248 No known interaction 2,582 (incl. Reslizumab)
Taking anything else?

Check Another of Your Medications Against Marsh Labrador Tea

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

What to actually watch for

What Marsh Labrador Tea Itself Has Been Linked To

This is not an interaction — nothing below involves Reslizumab. It is the side-effect record for Marsh Labrador Tea on its own, from the licensed Natural Medicines monograph. If something new turns up after you add Marsh Labrador Tea, this list is the first place to look. 2 entries are worth acting on rather than waiting out — marked below.

  • Seizures Worth acting on Additional detail

    “Orally, large amounts of marsh Labrador tea can cause poisoning due to its ledol constituent (2). The essential oil of marsh Labrador tea can cause severe irritation of the gastrointestinal tract, vomiting, diarrhea, irritation and damage to the kidneys and urinary tract, heavy perspiration, myalgias, and arthralgias.”

    Marsh Labrador Tea · Natural Medicines adverse-effect record, reported in diarrhea.

    2 sources cited
    1. 2. Blumenthal M, ed. The Complete German Commission E Monographs: Therapeutic Guide to Herbal Medicines. Trans. S. Klein. Boston, MA: American Botanical Council, 1998.
    2. 97164. Dampc A, Luczkiewicz M. Bog Labrador tea--the aromatic beverage and spice: a review of origin, processing and safety. J Sci Food Agric. 2015;95(8):1577-83. PubMed
  • Kidney problems Worth acting on Additional detail

    Recorded for Marsh Labrador Tea in the same Natural Medicines adverse-effect record shown under Seizures above.

  • Sweating Additional detail

    Recorded for Marsh Labrador Tea in the same Natural Medicines adverse-effect record shown under Seizures above.

  • Drowsiness / Dizziness Additional detail

    “Orally, large amounts of marsh Labrador tea can cause CNS depression, dizziness, and drowsiness. Conversely, marsh Labrador tea containing large quantities of ledol, a constituent of marsh Labrador tea essential oil, can cause central nervous system excitation in a dose-dependent manner.”

    Marsh Labrador Tea · Natural Medicines adverse-effect record, reported in vertigo.

    1 source cited
    1. 97164. Dampc A, Luczkiewicz M. Bog Labrador tea--the aromatic beverage and spice: a review of origin, processing and safety. J Sci Food Agric. 2015;95(8):1577-83. PubMed
  • Diarrhea / Vomiting Additional detail

    Recorded for Marsh Labrador Tea in the same Natural Medicines adverse-effect record shown under Seizures above.

Everything above comes from the Natural Medicines adverse-effect record for Marsh Labrador Tea — expand a row for the licensed statement it rests on. We read the ADVERSE REACTIONS section of Reslizumab’s FDA label too, and the two lists don’t meaningfully overlap — which is why no Reslizumab column appears here.

Special populations

Marsh Labrador Tea in Pregnancy & Breastfeeding

Pregnancy Likely Unsafe

When used orally; avoid using. Marsh Labrador tea is considered to be a potential uterine stimulant and abortifacient.

DISCLAIMER: This tool is intended for informational purposes only, and should not be interpreted as specific medical advice. Patients should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.© 2026 Therapeutic Research Center

Overlapping uses

What Reslizumab Is Prescribed For, and What Marsh Labrador Tea Has Been Studied For

These two come up together because they touch the same health topic — not because they do the same job. Reslizumab is a prescription medicine with approved uses on its FDA label. Marsh Labrador Tea is a supplement: what follows is what researchers have looked at it for, and how strong that evidence is.

Reslizumab is prescribed for: Cinqair (reslizumab) is approved as an add-on maintenance treatment for adults 18 years and older with severe asthma that has an eosinophilic phenotype — meaning the asthma is driven by high levels of a white blood cell called eosinophils. It is given alongside other asthma medicines, not instead of them. Cinqair is not a rescue inhaler and must not be used to treat sudden asthma attacks, acute bronchospasm, or status asthmaticus (a prolonged, severe asthma attack). It is also not approved for any other conditions involving high eosinophil counts.

Marsh Labrador Tea has been studied for:

  • Asthma studied, not established Marsh Labrador Tea has been studied for this. Natural Medicines rates the evidence: Insufficient Reliable Evidence To Rate Read what the research shows

    Marsh Labrador Tea for asthma

    Although there has been interest in using oral marsh Labrador tea for asthma, there is insufficient reliable information about the clinical effects of marsh Labrador tea for this condition.

Effectiveness ratings and the research summaries above are the verbatim record from the Natural Medicines database, which grades evidence from “Effective” down to “Insufficient Reliable Evidence To Rate”. A rating below the top of that scale means researchers have looked at it — not that it works, and never that it can stand in for a prescribed medicine. Do not stop or replace Reslizumab on your own; if you are taking Marsh Labrador Tea for the same health topic, tell your prescriber, especially if the medicine is being adjusted to a target.

How much people look this up

Where Marsh Labrador Tea and Reslizumab 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 Marsh Labrador Tea
Steady interest

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

29 days ago today
Medication Reslizumab
Steady interest

#1,916 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.

Where does our data come from?
  • Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions.
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Marsh Labrador Tea reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified October 4, 2026. The Marsh Labrador Tea and Reslizumab records this page draws on were last updated October 6, 2026.
  • What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
Data structure & sourcing designed and verified by .
Supplement

About Marsh Labrador Tea

What is Marsh Labrador Tea?

Marsh Labrador Tea
  • Colds and respiratory complaints
  • Cough and congestion
  • Mild aches and joint discomfort
  • Topical relief of skin irritation, swelling, and insect bites
  • Traditional use as a diuretic

Marsh Labrador tea is a bog-growing shrub used in folk medicine for coughs, colds, and skin problems, but high-quality human evidence for any use is lacking. Because it contains grayanotoxins (andromedotoxin) that can be poisonous, it is not considered safe for routine use, and pregnant or breastfeeding people should avoid it.

Rhododendron tomentosum · Ericaceae · Leaves and flowering twigs (and an essential oil distilled from them) · Tea (infusion), essential oil, topical preparations

An interaction check asks whether these two react with each other — it does not ask whether Marsh Labrador Tea is a good idea for someone in your situation. Here is what our Marsh Labrador Tea record says about it on its own.

Marsh Labrador Tea: dosing

There is no established safe or standardized dose for Marsh Labrador tea. Because the plant naturally contains toxic grayanotoxins, even traditional preparations carry risk, and stronger or longer brews increase that risk.If you choose to use a commercial product, follow the directions on the label exactly and do not exceed them. Never assume that "natural" means harmless.

From our Marsh Labrador Tea monograph — the full record covers uses, side effects and every documented interaction.

Read the full Marsh Labrador Tea monograph & all interactions
Medication

About Reslizumab Injection

What Is Reslizumab Injection Used For?

Brand name: Cinqair

Cinqair (reslizumab) is approved as an add-on maintenance treatment for adults 18 years and older with severe asthma that has an eosinophilic phenotype — meaning the asthma is driven by high levels of a white blood cell called eosinophils. It is given alongside other asthma medicines, not instead of them.

Cinqair is not a rescue inhaler and must not be used to treat sudden asthma attacks, acute bronchospasm, or status asthmaticus (a prolonged, severe asthma attack). It is also not approved for any other conditions involving high eosinophil counts.

See full Reslizumab Injection drug information
Keep checking

Other Drugs & Marsh Labrador Tea

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

0Major
248Moderate
0Minor
2,581No known interaction
248 Moderate 2,581 No interaction
Moderate

248 interactions

Showing 60 of 248 moderate interactions — see all 248 on the Marsh Labrador Tea page.

No interaction 2,581 drugs checked — show the list

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

Showing the 60 most looked-up of 2,581 medications checked with no known interaction — see the full Marsh Labrador Tea list.

See the full Marsh Labrador Tea interactions page
See every supplement checked against Reslizumab, ranked by severity
Evidence & sources

Marsh Labrador Tea References

The 3 references that drive our Marsh Labrador Tea monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.

  1. Blumenthal M, ed. The Complete German Commission E Monographs: Therapeutic Guide to Herbal Medicines. Trans. S. Klein. Boston, MA: American Botanical Council, 1998.
  2. Brinker F. Herb Contraindications and Drug Interactions. 2nd ed. Sandy, OR: Eclectic Medical Publications, 1998.
  3. Dampc A, Luczkiewicz M. Bog Labrador tea--the aromatic beverage and spice: a review of origin, processing and safety. J Sci Food Agric. 2015;95(8):1577-83. PubMed

Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Pharmacist Counseling Corner

Taking Marsh Labrador Tea and Reslizumab Together: Common Questions

Is it safe to take Marsh Labrador Tea with Reslizumab?
We do not list a known interaction between Marsh Labrador Tea and Reslizumab. That does not guarantee the combination is risk-free, so confirm with your pharmacist or doctor — especially if you take other medications or have a health condition.
Are Marsh Labrador Tea and Reslizumab used for the same thing?
They overlap in purpose, which usually means the real question is whether you need both rather than whether they are safe together. This page lists the shared uses and how strong the evidence is for Marsh Labrador Tea in each. That is a conversation for your prescriber, especially if Reslizumab is being adjusted to a target.
Does Marsh Labrador Tea interact with any other medications?
Yes. Marsh Labrador Tea has 248 documented drug interactions in our database — Reslizumab is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.

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

Where next

Keep Exploring

Marsh Labrador Tea monograph Uses, safety profile, and every drug interaction in one place Reslizumab Injection drug information The full plain-English guide to this medication Reslizumab supplement interactions Every supplement checked against Reslizumab, ranked by severity Supplement interaction checker Check any supplement or product against your medications Browse medications A–Z Every drug we’ve checked against herbs & supplements References The 3 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Reslizumab and Marsh Labrador Tea?

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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.