Drug & supplement interaction

Cat's Foot + Zanamivir

Zanamivir brand name: Relenza.

No Known Interaction

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Updated June 2026 · Pair last verified Sep 27, 2026

The bottom line No known interaction

We found no known interaction between Cat's Foot 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.

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Interaction report

Cat's Foot 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 Cat's Foot 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.

Worth understanding: our licensed dataset holds no drug-interaction record for Cat's Foot at all — not against Zanamivir, and not against any other medication we track. This verdict therefore rests on the absence of any recorded data, not on research that looked at this combination and found nothing. We cannot rule an interaction out.

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.

Cat's Foot safety at a glance

Cat's Foot overall Not established Very little human safety data exists, so caution is advised.

Pregnancy Avoid Not enough safety information; best to avoid during pregnancy.

Breastfeeding Avoid No reliable safety data, so avoid while breastfeeding.

Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Zanamivir and Cat's Foot? Ask Dr. Brian Staiger, PharmD, BCPS directly ›

What to actually watch for

What Zanamivir’s Own FDA Label Lists

This is not an interaction — none of it involves Cat's Foot. These are the most notable effects listed in the ADVERSE REACTIONS section of Zanamivir’s own FDA label, for the medication by itself. Knowing the drug’s own list makes it easier to work out the likely cause if something new turns up while you take both. 2 of them are worth acting on rather than waiting out — marked below.

Wheezing Worth acting on
A higher chance of infection Worth acting on
Chills
Cough
Joint pain
Fever
Dizziness
Diarrhea
Vomiting
Headache

Showing the 10 most notable of 11 label-listed effects — ranked by how unusual each one is across medicines generally, with serious effects weighted up.

From the ADVERSE REACTIONS section of the FDA label for Zanamivir. Read the label on DailyMed › Cat's Foot’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Cat's Foot side to compare — that is a limit of the record, not a statement that Cat's Foot has no side effects.

Everything else you take

See Every Supplement That Interacts With Zanamivir

This page covers Cat's Foot 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

How much people look this up

Where Cat's Foot 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 Cat's Foot

Steady interest

#1,392 of 1,452 supplements looked up here in the last 7 days

29 days ago today

Medication Zanamivir

Steady interest

#2,128 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. Cat's Foot is not yet covered by that licensed database, so its write-up cites publicly available medical sources directly (see the references below).
Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Cat's Foot reference on this page ↓
Freshness: we automatically re-check this combination every week — this pair was last verified September 27, 2026. The Cat's Foot and Zanamivir records this page draws on were last updated June 22, 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 Dr. Brian Staiger, PharmD, BCPS.

Supplement

About Cat's Foot

What is Cat's Foot?

Cough and sore throat
Digestive upset
Gallbladder and liver complaints
Mild inflammation
Diarrhea

Cat's Foot (Antennaria dioica) is a small flowering plant from the daisy family used in traditional European herbal medicine, mostly as a tea for coughs and digestive complaints. There is very little modern scientific research on its safety or effectiveness, so its benefits remain unproven. Talk with a pharmacist or doctor before using it, and avoid it if you are pregnant or breastfeeding.

Antennaria dioica · Asteraceae · Flowers and aerial (above-ground) parts · Tea (infusion), dried herb, tincture, sometimes capsules

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

Cat's Foot: dosing

There is no established standard dose for Cat's Foot. It has not been studied enough to know what amount is safe or effective.If you choose to use a product, follow the directions on the label and do not exceed the recommended amount.

From our Cat's Foot monograph — the full record covers uses, side effects and every documented interaction.

Read the full Cat's Foot 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 & Cat's Foot

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

0Major

0Moderate

0Minor

2,829No known interaction

2,829 No interaction

No interaction 2,829 drugs checked — show the list

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

Showing the 60 most looked-up of 2,829 medications checked with no known interaction — see the full Cat's Foot list.

See the full Cat's Foot interactions page

See every supplement checked against Zanamivir, ranked by severity

Evidence & sources

Cat's Foot References

The 3 sources that drive our Cat's Foot monograph — publicly available pages from reputable medical and government organizations. Every link was verified to work before publishing. Cat's Foot is not covered by the licensed Natural Medicines interaction database, so its page cites these public sources directly.

Using Dietary Supplements Wisely — NIH NCCIH Source
Herbs at a Glance — NIH NCCIH Source
Herbal Supplements — MedlinePlus Source

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 Cat's Foot and Zanamivir Together: Common Questions

Is it safe to take Cat's Foot with Zanamivir?

We do not list a known interaction between Cat's Foot 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.

Does Zanamivir interact with any supplements?

Yes. Zanamivir has documented interactions with 17 supplements in our database — Cat's Foot 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

Cat's Foot 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 Cat's Foot?

Our pharmacists answer your medication & supplement questions — free.

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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.