Drug & supplement interaction

European Chestnut + Pyrimethamine

Pyrimethamine brand name: Daraprim.

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

We found no known interaction between European Chestnut and Pyrimethamine 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

European Chestnut and Pyrimethamine

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 Pyrimethamine and European Chestnut 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 European Chestnut at all — not against Pyrimethamine, 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.

European Chestnut safety at a glance

European Chestnut overall Use caution The nut is a common food, but concentrated leaf or bark extracts have not been well studied for safety.
Pregnancy Avoid There is not enough safety information, so medicinal use during pregnancy is best avoided.
Breastfeeding Avoid Safety during breastfeeding is unknown, so medicinal use is best avoided.

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

Still wondering about combining Pyrimethamine and European Chestnut? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

What Pyrimethamine’s Own FDA Label Lists

This is not an interaction — none of it involves European Chestnut. These are the most notable effects listed in the ADVERSE REACTIONS section of Pyrimethamine’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. 6 of them are worth acting on rather than waiting out — marked below.

  • A severe skin reaction Worth acting on
  • A low white blood cell count Worth acting on mentioned in 5.8% of FDA reports for Pyrimethamine
  • A low platelet count Worth acting on
  • Anemia Worth acting on
  • A severe allergic reaction Worth acting on
  • An allergic reaction Worth acting on
  • Reduced appetite
  • Vomiting mentioned in 8.2% of FDA reports for Pyrimethamine

From the ADVERSE REACTIONS section of the FDA label for Pyrimethamine. Read the label on DailyMed › Where a percentage is shown, it is the share of 1,238 voluntary FDA FAERS reports for Pyrimethamine that mention that effect — a reporting proportion, not an incidence rate and not evidence the drug caused it. European Chestnut’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no European Chestnut side to compare — that is a limit of the record, not a statement that European Chestnut has no side effects.

Everything else you take

See Every Supplement That Interacts With Pyrimethamine

This page covers European Chestnut only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Pyrimethamine page lists 24 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Biofeedback (moderate), Coffee Charcoal (moderate), Dendrobium (moderate) and European Mandrake (moderate).

By severity: 1 major · 14 moderate · 9 minor.

From our pharmacist’s overview on the Pyrimethamine page

“Pyrimethamine (Daraprim) fights serious parasitic infections such as toxoplasmosis, often in people whose immune systems are already weakened, and a supplement that undercuts it can let the infection gain ground. That is why the 24 ingredients here warrant real wariness.”

Reviewed by 2 · Jul 18, 2026

Open the Pyrimethamine interaction page

How much people look this up

Where European Chestnut and Pyrimethamine 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 European Chestnut
Steady interest

#1,143 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Pyrimethamine
Steady interest

#2,609 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 European Chestnut reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The European Chestnut and Pyrimethamine records this page draws on were last updated July 10, 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 European Chestnut

What is European Chestnut?

  • Coughs and respiratory irritation
  • Diarrhea and digestive upset
  • Sore throat
  • Wound and skin care
  • General antioxidant support

European Chestnut is a tree whose leaves and nuts have a long history of use for coughs, diarrhea, and skin care, mostly in traditional folk medicine. High-quality human studies are lacking, so its benefits remain unproven, and it should be used cautiously and discussed with a pharmacist or doctor.

Castanea sativa · Fagaceae · Leaves, nuts (seeds), bark, and flowers · Tea, liquid extract, capsules, honey, and topical preparations

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

European Chestnut: dosing

There is no standardized or well-established medicinal dose for European Chestnut. Products vary widely in strength and in which part of the plant they use.If you choose to use a chestnut product, follow the directions on the label and do not exceed the recommended amount.

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

Read the full European Chestnut monograph & all interactions
Keep checking

Other Drugs & European Chestnut

Browse every other medication we’ve checked against European Chestnut — 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 European Chestnut 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 European Chestnut list.

See the full European Chestnut interactions page
See every supplement checked against Pyrimethamine, ranked by severity
Evidence & sources

European Chestnut References

The 1 references that drive our European Chestnut 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. McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997.

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 European Chestnut and Pyrimethamine Together: Common Questions

Is it safe to take European Chestnut with Pyrimethamine?
We do not list a known interaction between European Chestnut and Pyrimethamine. 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 Pyrimethamine interact with any supplements?
Yes. Pyrimethamine has documented interactions with 24 supplements in our database — European Chestnut is not one of them. The Pyrimethamine 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

European Chestnut monograph Uses, safety profile, and every drug interaction in one place Pyrimethamine supplement interactions Every supplement checked against Pyrimethamine, 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 1 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Pyrimethamine and European Chestnut?

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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.