Drug & supplement interaction

Meadowsweet + Zanamivir

Zanamivir brand name: Relenza.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 27, 2026
The bottom line No known interaction

We found no known interaction between Meadowsweet and Zanamivir 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. Additionally, although there is no interaction, the two are separately associated with some of the same side effects, which would make a new symptom harder to attribute to one or the other.

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Interaction report

Meadowsweet and Zanamivir

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 Zanamivir and Meadowsweet 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.

Meadowsweet safety at a glance

Meadowsweet overall Use caution Generally used in food-like amounts, but it contains salicylates and human safety data are limited.
Pregnancy Likely Unsafe When used orally. Some evidence suggests meadowsweet might stimulate uterine activity. Read the full pregnancy detail
Breastfeeding Avoid Not enough safety information; best avoided while breastfeeding.

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 Zanamivir and Meadowsweet? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Zanamivir

Interactions in our licensed database are recorded against drug classes, not just single drug names. Zanamivir is filed under a single classification — oral drugs. Meadowsweet has documented interactions with 3 drug classes — the most serious being aspirin (moderate), choline magnesium trisalicylate (trilisate) (moderate) and salsalate (disalcid) (moderate) — and none of Zanamivir’s classifications are among them.

Classification data comes from our licensed Natural Medicines dataset. A medication can belong to classes beyond those recorded there, so this describes how the check was run — it is not a safety guarantee.

Keep it in perspective

Meadowsweet Does Interact With Other Medications

Meadowsweet has 39 moderate known drug interactions in our database — Zanamivir isn’t one of them. If you take anything else, check it against the full list below.

Moderate 39 No known interaction 2,791 (incl. Zanamivir)
Taking anything else?

Check Another of Your Medications Against Meadowsweet

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

What to actually watch for

No Interaction Found — But Data Suggests Meadowsweet and Zanamivir May Share Several of the Same Side Effects

This is not an interaction. Neither one changes how your body handles the other, and nothing here says they react together. What our sources do show is that each has separately been linked to the effects below — so taking both can make those effects more likely to turn up, and harder to pin on one or the other if they do.

  • Vomiting / Nausea Additional detail

    Meadowsweet

    “Orally, large doses of meadowsweet can cause nausea and other stomach complaints (18).

    Meadowsweet contains salicylate constituents. There is insufficient reliable information available to know if the side effects and toxicity normally associated with salicylates could occur with meadowsweet use. Adverse reactions associated with salicylates include gastric irritation, hematochezia, nausea, and vomiting (4).”

    Meadowsweet · Natural Medicines adverse-effect record, reported in nausea and vomiting.

    2 sources cited
    1. 18. Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.
    2. 4. Newall CA, Anderson LA, Philpson JD. Herbal Medicine: A Guide for Healthcare Professionals. London, UK: The Pharmaceutical Press, 1996.

    Zanamivir

    Listed in the ADVERSE REACTIONS section of the FDA label for Zanamivir. Read the label on DailyMed ›

Reported for Meadowsweet but not commonly for Zanamivir: stomach upset and ringing in the ears.

Effects for Zanamivir come from the ADVERSE REACTIONS section of its FDA label; effects for Meadowsweet come from the Natural Medicines adverse-effect record, quoted above. Wording is matched across sources by our own clinical vocabulary, so treat this as a prompt to pay attention, not a diagnosis.

Special populations

Meadowsweet in Pregnancy & Breastfeeding

Pregnancy Likely Unsafe

When used orally. Some evidence suggests meadowsweet might stimulate uterine activity.

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 Zanamivir Is Prescribed For, and What Meadowsweet Has Been Studied For

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

Zanamivir is prescribed for: Relenza (zanamivir) inhalation powder is used to treat uncomplicated, acute influenza A and B in adults and children aged 7 and older — but only when symptoms have been present for no more than 2 days. The sooner treatment starts, the better. Relenza is also used to help prevent (prophylax) influenza in adults and children aged 5 and older, including in household settings where someone is sick and in broader community outbreaks. It is not a substitute for your annual flu vaccine, and it has not been shown to prevent influenza in nursing home residents.

Meadowsweet has been studied for:

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

    Meadowsweet for headache

    Although there has been interest in using oral meadowsweet for headache, there is insufficient reliable information about the clinical effects of meadowsweet for these conditions.

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 Zanamivir on your own; if you are taking Meadowsweet for the same health topic, tell your prescriber, especially if the medicine is being adjusted to a target.

Everything else you take

See Every Supplement That Interacts With Zanamivir

This page covers Meadowsweet only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Zanamivir page lists 17 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Coffee Charcoal (moderate), European Mandrake (moderate), Glucomannan (moderate) and Guar Gum (moderate).

By severity: 1 major · 7 moderate · 9 minor.

From our pharmacist’s overview on the Zanamivir page

“Activated charcoal is the single entry I would want anyone on zanamivir (Relenza) to understand first. It holds the one major rating among the 17 supplements known to interact, because charcoal binds many drugs and can lower how much reaches the body, even when a medicine is not swallowed.”

Reviewed by 2 · Jul 18, 2026

Open the Zanamivir interaction page

One more smart check

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

We hold 197 real supplement products containing Meadowsweet, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Meadowsweet. Even though Meadowsweet itself has no known interaction with Zanamivir, another ingredient on your label might. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Meadowsweet and Zanamivir 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 Meadowsweet
Top half

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

29 days ago today
Medication Zanamivir
Steady interest

#1,711 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 Meadowsweet reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 27, 2026. The Meadowsweet and Zanamivir records this page draws on were last updated July 11, 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 Meadowsweet

What is Meadowsweet?

Meadowsweet
  • Heartburn and indigestion
  • Cold and flu symptoms
  • Mild aches and pains
  • Fever
  • Joint discomfort

Meadowsweet is a traditional European herb that contains natural salicylates (aspirin-like compounds) and is used mainly for digestive upset, colds, and minor aches. High-quality human studies are lacking, so its benefits are not well proven, and people sensitive to aspirin should be cautious. Talk with your pharmacist or doctor before using it.

Filipendula ulmaria · Rosaceae · Flowers and above-ground (aerial) parts, sometimes the root · Tea, dried herb, tincture, liquid extract, capsules

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

Meadowsweet: dosing

There is no well-established, standardized dose for meadowsweet. Traditional use varies widely depending on the form — for example, dried flowers steeped as a tea, or a tincture or capsule taken according to the maker's directions.Because product strengths differ a great deal, the safest approach is to follow the directions on the product label and not exceed the recommended amount.

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

Read the full Meadowsweet monograph & all interactions
Medication

About Zanamivir Oral Inhalation

What Is Zanamivir Oral Inhalation Used For?

Brand name: Relenza

Relenza (zanamivir) inhalation powder is used to treat uncomplicated, acute influenza A and B in adults and children aged 7 and older — but only when symptoms have been present for no more than 2 days. The sooner treatment starts, the better.

Relenza is also used to help prevent (prophylax) influenza in adults and children aged 5 and older, including in household settings where someone is sick and in broader community outbreaks. It is not a substitute for your annual flu vaccine, and it has not been shown to prevent influenza in nursing home residents.

Most-Reported Side Effects for Zanamivir

From FAERS, the FDA’s public side-effect reporting system (2,524 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Abnormal behaviour 398 reports
Overdose 395 reports
Drug exposure during pregnancy 244 reports
Hallucination 159 reports
Drug exposure via breast milk 123 reports
See full Zanamivir Oral Inhalation drug information
Keep checking

Other Drugs & Meadowsweet

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

0Major
39Moderate
0Minor
2,790No known interaction
39 Moderate 2,790 No interaction
Moderate

39 interactions

No interaction 2,790 drugs checked — show the list

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

Showing the 60 most looked-up of 2,790 medications checked with no known interaction — see the full Meadowsweet list.

See the full Meadowsweet interactions page
See every supplement checked against Zanamivir, ranked by severity
Evidence & sources

Meadowsweet References

The 3 references that drive our Meadowsweet 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. Newall CA, Anderson LA, Philpson JD. Herbal Medicine: A Guide for Healthcare Professionals. London, UK: The Pharmaceutical Press, 1996.
  2. McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997.
  3. Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.

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 Meadowsweet and Zanamivir Together: Common Questions

Is it safe to take Meadowsweet with Zanamivir?
We do not list a known interaction between Meadowsweet and Zanamivir. 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.
Do Meadowsweet and Zanamivir have any of the same side effects?
Yes — our sources link each of them separately to 2 of the same effects. That is not an interaction: neither changes how your body handles the other. It does mean that if one of those effects turns up, it can be harder to tell which one is behind it. They are listed on this page with the source behind each.
Are Meadowsweet and Zanamivir 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 Meadowsweet in each. That is a conversation for your prescriber, especially if Zanamivir is being adjusted to a target.
How was the Meadowsweet and Zanamivir combination checked?
Interactions in our licensed database are recorded against drug classes. Zanamivir is filed under 1 classification, and Meadowsweet has documented interactions with 3 drug classes — none of Zanamivir's classifications are among them. A medication can belong to classes beyond those recorded in our dataset, so this describes how the check was run rather than guaranteeing safety.
Does Meadowsweet interact with any other medications?
Yes. Meadowsweet has 39 documented drug interactions in our database — Zanamivir is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.
Does Zanamivir interact with any supplements?
Yes. Zanamivir has documented interactions with 17 supplements in our database — Meadowsweet is not one of them. The Zanamivir interaction page linked on this page lists every one, ranked by severity.

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

Where next

Keep Exploring

Meadowsweet monograph Uses, safety profile, and every drug interaction in one place Zanamivir Oral Inhalation drug information The full plain-English guide to this medication Zanamivir supplement interactions Every supplement checked against Zanamivir, 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 Zanamivir and Meadowsweet?

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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.