Drug & supplement interaction

Ignatius Bean + Letrozole

Letrozole brand name: Femara.

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 Ignatius Bean and Letrozole 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

Ignatius Bean and Letrozole

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 Letrozole and Ignatius Bean 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 Ignatius Bean at all — not against Letrozole, 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.

Ignatius Bean safety at a glance

Ignatius Bean overall Avoid The seed contains strychnine and brucine and is poisonous if taken in crude form.
Pregnancy Unsafe When used orally due to toxic effects. Read the full pregnancy detail
Breastfeeding Unsafe When used orally due to toxic effects. Read the full breastfeeding detail

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 Letrozole and Ignatius Bean? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

What Ignatius Bean Itself Has Been Linked To

This is not an interaction — nothing below involves Letrozole. It is the side-effect record for Ignatius Bean on its own, from the licensed Natural Medicines monograph. If something new turns up after you add Ignatius Bean, this list is the first place to look. 5 entries are worth acting on rather than waiting out — marked below.

  • Severe muscle breakdown Worth acting on Additional detail

    “Orally, Ignatius bean is generally regarded as unsafe for use. Any benefits of therapy may not outweigh the risk of toxicity. Ignatius bean 30-50 mg, which contains approximately 5 mg of strychnine, can cause restlessness, anxiety, heightened sense perception, enhanced reflexes, equilibrium disorders, painful back and neck stiffness, twitching, spasms of jaw and neck muscles, myoglobinuric renal failure, rhabdomyolys…”

    Ignatius Bean · Natural Medicines adverse-effect record, reported in anxiety.

    4 sources cited
    1. 55854. Ellenhorn M. Ellenhorn's Medical Toxicology: Diagnoses and Treatment of Human Poisoning. Baltimore, MD: Williams & Wilkins, 1997.
    2. 17. Ellenhorn MJ, et al. Ellenhorn's Medical Toxicology: Diagnoses and Treatment of Human Poisoning. 2nd ed. Baltimore, MD: Williams & Wilkins, 1997.
    3. 18. Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.
    4. 505. Hardman JG, Limbird LL, Molinoff PB, eds. Goodman and Gillman's The Pharmacological Basis of Therapeutics, 9th ed. New York, NY: McGraw-Hill, 1996.

    “Orally, Ignatius bean 30-50 mg, which contains approximately 5 mg of strychnine, has been reported to cause rhabdomyolysis, painful back and neck stiffness, spasms of jaw and neck muscles, and extreme muscle tension.”

    Ignatius Bean · Natural Medicines adverse-effect record, reported in muscle breakdown.

    1 source cited
    1. 55854. Ellenhorn M. Ellenhorn's Medical Toxicology: Diagnoses and Treatment of Human Poisoning. Baltimore, MD: Williams & Wilkins, 1997.
  • Seizures Worth acting on Additional detail

    “Orally, Ignatius bean 30-50 mg, which contains approximately 5 mg of strychnine, has been reported to cause restlessness, anxiety, heightened sense perception, enhanced reflexes, and twitching. It has also been reported to cause seizures within 15 minutes of ingestion.”

    Ignatius Bean · Natural Medicines adverse-effect record, reported in anxiety.

    4 sources cited
    1. 55854. Ellenhorn M. Ellenhorn's Medical Toxicology: Diagnoses and Treatment of Human Poisoning. Baltimore, MD: Williams & Wilkins, 1997.
    2. 18. Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.
    3. 505. Hardman JG, Limbird LL, Molinoff PB, eds. Goodman and Gillman's The Pharmacological Basis of Therapeutics, 9th ed. New York, NY: McGraw-Hill, 1996.
    4. 17. Ellenhorn MJ, et al. Ellenhorn's Medical Toxicology: Diagnoses and Treatment of Human Poisoning. 2nd ed. Baltimore, MD: Williams & Wilkins, 1997.
  • Kidney problems Worth acting on Additional detail

    “Orally, Ignatius bean has been associated with myoglobinuric renal failure.”

    Ignatius Bean · Natural Medicines adverse-effect record, reported in kidney failure.

    1 source cited
    1. 55854. Ellenhorn M. Ellenhorn's Medical Toxicology: Diagnoses and Treatment of Human Poisoning. Baltimore, MD: Williams & Wilkins, 1997.
  • Shortness of breath Worth acting on Additional detail

    “Orally, Ignatius bean 30-50 mg, which contains approximately 5 mg of strychnine, has been reported to cause respiratory acidosis and difficulty breathing due to respiratory spasms.”

    Ignatius Bean · Natural Medicines adverse-effect record, reported in myasthenia gravis.

    1 source cited
    1. 55854. Ellenhorn M. Ellenhorn's Medical Toxicology: Diagnoses and Treatment of Human Poisoning. Baltimore, MD: Williams & Wilkins, 1997.
  • Liver problems Worth acting on Additional detail

    Recorded for Ignatius Bean in the same Natural Medicines adverse-effect record shown under Severe muscle breakdown above.

  • Anxiety or restlessness Additional detail

    Recorded for Ignatius Bean in the same Natural Medicines adverse-effect record shown under Severe muscle breakdown above.

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

Special populations

Ignatius Bean in Pregnancy & Breastfeeding

Pregnancy And Lactation Unsafe

When used orally due to toxic effects.

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

From our Q&A

Questions About Ignatius Bean or Letrozole

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Ignatius Bean or Letrozole, not necessarily both, but if one is close to what you were about to ask it will usually go further than a database entry can:

Not quite your question? Ask our pharmacists directly — it is free, there is no account required, and answers usually come back within 24 hours.

Everything else you take

See Every Supplement That Interacts With Letrozole

This page covers Ignatius Bean only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Letrozole page lists 142 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Grapefruit (major), St. John's Wort (major), 7-methoxyflavone (moderate) and Acacia Rigidula (moderate).

By severity: 3 major · 99 moderate · 40 minor.

From our pharmacist’s overview on the Letrozole page

“Letrozole (Femara) is prescribed to keep hormone-driven breast cancer from returning, so a supplement that shifts its blood level can quietly undercut treatment. Give this list of 142 ingredients genuine respect, and learn the three major entries first.”

Reviewed by 2 · Jul 18, 2026

Open the Letrozole interaction page

One more smart check

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

We hold 2 real supplement products containing Ignatius Bean, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Ignatius Bean. Even though Ignatius Bean itself has no known interaction with Letrozole, 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 Ignatius Bean and Letrozole 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 Ignatius Bean
Top half

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

29 days ago today
Medication Letrozole
Top 5%

#50 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 Ignatius Bean reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Ignatius Bean and Letrozole 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 Ignatius Bean

What is Ignatius Bean?

Ignatius Bean
  • Grief, sadness, and emotional upset (homeopathic use)
  • Anxiety and stress (homeopathic use)
  • Mood swings
  • Digestive complaints (traditional use)
  • Historically used as a stimulant or for paralysis

Ignatius bean is a seed that naturally contains strychnine and brucine, which are highly toxic poisons. The raw seed or crude extracts should never be taken because even small amounts can cause dangerous muscle spasms and death. Today it is mainly seen in highly diluted homeopathic products (Ignatia), and you should talk to a pharmacist or doctor before using anything made from this plant.

Strychnos ignatii · Loganiaceae · Seed (the dried ripe seed, called the bean) · Homeopathic pellets and dilutions (Ignatia amara); raw seed is not used as a regular supplement

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

Ignatius Bean: dosing

There is no safe established dose of crude Ignatius bean. Because the seed contains strychnine, taking measured amounts of the raw plant is dangerous and is not recommended under any circumstances.Homeopathic Ignatia products come in their own dilutions and pellet strengths, with directions on the label.

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

Read the full Ignatius Bean monograph & all interactions
Medication

About Letrozole

What Is Letrozole Used For?

Brand name: Femara

Letrozole (brand name Femara) is used to treat breast cancer in postmenopausal women whose tumors are driven by estrogen. It is used in three settings: as adjuvant (after-surgery) treatment for hormone receptor positive early breast cancer; as extended adjuvant treatment for women who have already completed about five years of tamoxifen therapy; and as first- or second-line treatment for locally advanced or metastatic (spread) breast cancer.

Femara is specifically indicated for first-line treatment of hormone receptor positive or receptor-unknown locally advanced or metastatic breast cancer, and for advanced breast cancer in women whose disease has progressed after antiestrogen therapy.

See full Letrozole drug information
Keep checking

Other Drugs & Ignatius Bean

Browse every other medication we’ve checked against Ignatius Bean — 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 Ignatius Bean 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 Ignatius Bean list.

See the full Ignatius Bean interactions page
See every supplement checked against Letrozole, ranked by severity
Evidence & sources

Ignatius Bean References

The 6 references that drive our Ignatius Bean 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. Ellenhorn MJ, et al. Ellenhorn's Medical Toxicology: Diagnoses and Treatment of Human Poisoning. 2nd ed. Baltimore, MD: Williams & Wilkins, 1997.
  2. Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.
  3. Hardman JG, Limbird LL, Molinoff PB, eds. Goodman and Gillman's The Pharmacological Basis of Therapeutics, 9th ed. New York, NY: McGraw-Hill, 1996.
  4. Hardman J, Limbird L. Goodman and Gillman's The Pharmacological Basis of Therapeutics, 9th ed. New York, NY: McGraw-Hill, 1996.
  5. Ellenhorn M. Ellenhorn's Medical Toxicology: Diagnoses and Treatment of Human Poisoning. Baltimore, MD: Williams & Wilkins, 1997.
  6. Gruenwald J. PDR for Herbal Medicines. 1st ed 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 Ignatius Bean and Letrozole Together: Common Questions

Is it safe to take Ignatius Bean with Letrozole?
We do not list a known interaction between Ignatius Bean and Letrozole. 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 Letrozole interact with any supplements?
Yes. Letrozole has documented interactions with 142 supplements in our database — Ignatius Bean is not one of them. The Letrozole 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

Ignatius Bean monograph Uses, safety profile, and every drug interaction in one place Letrozole drug information The full plain-English guide to this medication Letrozole supplement interactions Every supplement checked against Letrozole, 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 6 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Letrozole and Ignatius Bean?

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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.