Drug & supplement interaction

Canadian Fleabane + Methenamine Mandelate

Methenamine Mandelate brand names: Mandelamine, Methimazole.

No Known Interaction
Medically reviewed by · Updated June 2026 · Pair last verified Sep 13, 2026
The bottom line No known interaction

We found no known interaction between Canadian Fleabane and Methenamine Mandelate 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

Canadian Fleabane and Methenamine Mandelate

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 Methenamine Mandelate and Canadian Fleabane 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.

Canadian Fleabane safety at a glance

Canadian Fleabane overall Use caution Used traditionally, but human safety data are limited so use cautiously.
Pregnancy Avoid Not enough safety information, so avoid use during pregnancy.
Breastfeeding Avoid Not enough safety information, so avoid use while breastfeeding.

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

Still wondering about combining Methenamine Mandelate and Canadian Fleabane? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Methenamine Mandelate

Interactions in our licensed database are recorded against drug classes, not just single drug names. Methenamine Mandelate is filed under 4 classifications — including antithyroid drugs, antibiotic drugs, hepatotoxic drugs. Canadian Fleabane has documented interactions with 1 drug class — the most serious being anticoagulant/antiplatelet drugs (moderate) — and none of Methenamine Mandelate’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

Canadian Fleabane Does Interact With Other Medications

Canadian Fleabane has 122 moderate known drug interactions in our database — Methenamine Mandelate isn’t one of them. If you take anything else, check it against the full list below.

Moderate 122 No known interaction 2,708 (incl. Methenamine Mandelate)
Taking anything else?

Check Another of Your Medications Against Canadian Fleabane

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

What to actually watch for

What Methenamine Mandelate’s Own FDA Label Lists

This is not an interaction — none of it involves Canadian Fleabane. These are the most notable effects listed in the ADVERSE REACTIONS section of Methenamine Mandelate’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. 8 of them are worth acting on rather than waiting out — marked below.

  • Pancreatitis Worth acting on
  • Yellowing of the skin or eyes Worth acting on
  • A low platelet count Worth acting on
  • Kidney problems Worth acting on
  • Anemia Worth acting on
  • Hives Worth acting on
  • A low white blood cell count Worth acting on
  • Liver problems Worth acting on
  • A change in taste
  • Numbness or tingling

Showing the 10 most notable of 21 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 Methenamine Mandelate. Read the label on DailyMed › Where a percentage is shown, it is the share of 186 voluntary FDA FAERS reports for Methenamine Mandelate that mention that effect — a reporting proportion, not an incidence rate and not evidence the drug caused it. Canadian Fleabane’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Canadian Fleabane side to compare — that is a limit of the record, not a statement that Canadian Fleabane has no side effects.

Everything else you take

See Every Supplement That Interacts With Methenamine Mandelate

This page covers Canadian Fleabane only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Methenamine Mandelate page lists 91 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Beer (major), Siberian Cocklebur (major), Wine (major) and Ascophyllum Nodosum (moderate).

By severity: 4 major · 77 moderate · 10 minor.

From our pharmacist’s overview on the Methenamine Mandelate page

“People take methenamine mandelate (Mandelamine) day after day to keep urinary tract infections at bay, and that long habit is exactly why the 91 supplements on this page deserve genuine vigilance. Four carry a major rating, and most of those point at the liver: Siberian cocklebur has been linked to outright liver failure, and heavy bee…”

Reviewed by 2 · Jul 18, 2026

Open the Methenamine Mandelate interaction page

How much people look this up

Where Canadian Fleabane and Methenamine Mandelate 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 Canadian Fleabane
Top half

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

29 days ago today
Medication Methenamine Mandelate
Top 25%

#300 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 Canadian Fleabane reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Canadian Fleabane and Methenamine Mandelate 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 .
Supplement

About Canadian Fleabane

What is Canadian Fleabane?

  • Diarrhea
  • Minor bleeding
  • Urinary complaints
  • Digestive upset
  • Sore throat and inflammation

Canadian Fleabane is a common North American weed used in traditional medicine for diarrhea, minor bleeding, and urinary issues, but high-quality human studies are lacking. Because its safety has not been well studied, it is best to talk with your pharmacist or doctor before using it, and to avoid it during pregnancy and breastfeeding.

Erigeron canadensis · Asteraceae · Aerial parts (leaves, stems, flowers) and the essential oil · Tea, tincture, dried herb, liquid extract, essential oil

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

Canadian Fleabane: dosing

There is no established, science-based standard dose for Canadian Fleabane. Traditional preparations such as teas and tinctures vary widely in strength, and product labels differ from brand to brand.If you choose to use a commercial product, follow the directions on the label and do not exceed them. The essential oil is very concentrated and is not meant to be taken by mouth without professional guidance.

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

Read the full Canadian Fleabane monograph & all interactions
Medication

About Methimazole

What Is Methimazole Used For?

Brand names: Mandelamine, Methimazole

Methimazole tablets are used in adults and children with hyperthyroidism (an overactive thyroid) due to Graves' disease or toxic multinodular goiter when surgery or radioactive iodine is not the right option. They work to lower thyroid hormone levels and ease symptoms.

Methimazole tablets are also used to bring thyroid hormone levels down before a patient undergoes thyroidectomy (thyroid surgery) or radioactive iodine treatment, making those procedures safer.

Most-Reported Side Effects for Methenamine Mandelate

From FAERS, the FDA’s public side-effect reporting system (186 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Urinary tract infection 29 reports
Fatigue 21 reports
Asthenia 19 reports
Fall 19 reports
Diarrhea 18 reports
See full Methimazole drug information
Keep checking

Other Drugs & Canadian Fleabane

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

0Major
122Moderate
0Minor
2,707No known interaction
122 Moderate 2,707 No interaction
Moderate

122 interactions

Showing 60 of 122 moderate interactions — see all 122 on the Canadian Fleabane page.

No interaction 2,707 drugs checked — show the list

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

Showing the 60 most looked-up of 2,707 medications checked with no known interaction — see the full Canadian Fleabane list.

See the full Canadian Fleabane interactions page
See every supplement checked against Methenamine Mandelate, ranked by severity
Evidence & sources

Canadian Fleabane References

The 2 references that drive our Canadian Fleabane 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. Saluk-Juszczak J, Olas B, Pawlaczyk I, Gancarz R, Wachowicz B. Effects of the extract from Conyza canadensis on human blood platelet aggregation. Gen Physiol Biophys 2007;26(2):150-2.
  2. Olas B, Saluk-Juszczak J, Pawlaczyk I, et al. Antioxidant and antiaggregatory effects of an extract from Conyza canadensis on blood platelets in vitro. Platelets 2006;17(6):354-60.

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 Canadian Fleabane and Methenamine Mandelate Together: Common Questions

Is it safe to take Canadian Fleabane with Methenamine Mandelate?
We do not list a known interaction between Canadian Fleabane and Methenamine Mandelate. 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.
How was the Canadian Fleabane and Methenamine Mandelate combination checked?
Interactions in our licensed database are recorded against drug classes. Methenamine Mandelate is filed under 4 classifications, and Canadian Fleabane has documented interactions with 1 drug class — none of Methenamine Mandelate'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 Canadian Fleabane interact with any other medications?
Yes. Canadian Fleabane has 122 documented drug interactions in our database — Methenamine Mandelate 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 Methenamine Mandelate interact with any supplements?
Yes. Methenamine Mandelate has documented interactions with 91 supplements in our database — Canadian Fleabane is not one of them. The Methenamine Mandelate 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

Canadian Fleabane monograph Uses, safety profile, and every drug interaction in one place Methimazole drug information The full plain-English guide to this medication Methenamine Mandelate supplement interactions Every supplement checked against Methenamine Mandelate, 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 2 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Methenamine Mandelate and Canadian Fleabane?

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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.