Drug & supplement interaction

Lathyrus + Methotrexate

Methotrexate brand names: Rheumatrex, Otrexup, Rasuvo, Reditrex.

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 Lathyrus and Methotrexate 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

Lathyrus and Methotrexate

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 Methotrexate and Lathyrus 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 Lathyrus at all — not against Methotrexate, 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.

Lathyrus safety at a glance

Lathyrus overall Use caution Heavy or prolonged intake of grass pea is linked to a serious nerve disorder called lathyrism.
Pregnancy Likely Unsafe When used orally; avoid using. Read the full pregnancy detail
Breastfeeding Likely Unsafe When used orally; avoid using. 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 Methotrexate and Lathyrus? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

No Interaction Found — But Data Suggests Lathyrus and Methotrexate May Share a Side Effect

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. One of them is worth acting on rather than waiting out — marked below.

  • Seizures Worth acting on Additional detail

    Lathyrus

    “Orally, consuming a diet high in lathyrus can cause neurotoxic manifestations including muscular rigidity, spasticity, weakness, paralysis, weak pulse, shallow breathing, convulsions, or death (6,58002,58008,58009,58012,58014,58018,58021,58023,58024). Consumption of lathyrus can also result in problems with collagen crosslinking.”

    Lathyrus · Natural Medicines adverse-effect record, reported in asthma.

    6 sources cited
    1. 6. The Review of Natural Products by Facts and Comparisons. St. Louis, MO: Wolters Kluwer Co., 1999.
    2. 58002. Spencer, P. S. Food toxins, ampa receptors, and motor neuron diseases. Drug Metab Rev 1999;31(3):561-587. PubMed
    3. 58008. Drory, V. E., Rabey, M. J., and Cohn, D. F. Electrophysiologic features in patients with chronic neurolathyrism. Acta Neurol.Scand 1992;85(6):401-403. PubMed
    4. 58009. Krogsgaard-Larsen, P. and Hansen, J. J. Naturally-occurring excitatory amino acids as neurotoxins and leads in drug design. Toxicol Lett 1992;64-65 Spec No:409-416. PubMed
    5. 58012. Pratap Rudra, M. P., Singh, M. R., Junaid, M. A., Jyothi, P., and Rao, S. L. Metabolism of dietary ODAP in humans may be responsible for the low incidence of neurolathyrism. Clin Biochem 2004;37(4):318-322. PubMed
    6. 58014. Yan, Z. Y., Spencer, P. S., Li, Z. X., Liang, Y. M., Wang, Y. F., Wang, C. Y., and Li, F. M. Lathyrus sativus (grass pea) and its neurotoxin ODAP. Phytochemistry 2006;67(2):107-121. PubMed

    “Orally, lathyrus consumption is associated with the disease lathyrism. Neurological symptoms are known as neurolathyrism. Symptoms of neurolathyrism include muscular rigidity, spasticity, weakness, paralysis of leg muscles, weak pulse, shallow breathing, convulsions, or death (6).”

    Lathyrus · Natural Medicines adverse-effect record, reported in spasticity.

    6 sources cited
    1. 58002. Spencer, P. S. Food toxins, ampa receptors, and motor neuron diseases. Drug Metab Rev 1999;31(3):561-587. PubMed
    2. 58009. Krogsgaard-Larsen, P. and Hansen, J. J. Naturally-occurring excitatory amino acids as neurotoxins and leads in drug design. Toxicol Lett 1992;64-65 Spec No:409-416. PubMed
    3. 58012. Pratap Rudra, M. P., Singh, M. R., Junaid, M. A., Jyothi, P., and Rao, S. L. Metabolism of dietary ODAP in humans may be responsible for the low incidence of neurolathyrism. Clin Biochem 2004;37(4):318-322. PubMed
    4. 58014. Yan, Z. Y., Spencer, P. S., Li, Z. X., Liang, Y. M., Wang, Y. F., Wang, C. Y., and Li, F. M. Lathyrus sativus (grass pea) and its neurotoxin ODAP. Phytochemistry 2006;67(2):107-121. PubMed
    5. 58018. Spencer, P. S., Roy, D. N., Ludolph, A., Hugon, J., Dwivedi, M. P., and Schaumburg, H. H. Lathyrism: evidence for role of the neuroexcitatory aminoacid BOAA. Lancet 11-8-1986;2(8515):1066-1067. PubMed
    6. 58024. Spencer, P. S. and Schaumburg, H. H. Lathyrism: a neurotoxic disease. Neurobehav.Toxicol Teratol. 1983;5(6):625-629.

    Methotrexate

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

Reported for Lathyrus but not commonly for Methotrexate: wheezing.

Effects for Methotrexate come from the ADVERSE REACTIONS section of its FDA label; effects for Lathyrus come from the Natural Medicines adverse-effect record, quoted above. Where a percentage is shown, it is the share of 489,806 voluntary FDA FAERS reports for Methotrexate that mention that effect — a reporting proportion, not an incidence rate and not evidence the drug caused it. Wording is matched across sources by our own clinical vocabulary, so treat this as a prompt to pay attention, not a diagnosis.

Special populations

Lathyrus in Pregnancy & Breastfeeding

Pregnancy And Lactation Likely Unsafe

When used orally; avoid using.

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 Lathyrus or Methotrexate

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Lathyrus or Methotrexate, 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 Methotrexate

This page covers Lathyrus only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Methotrexate page lists 82 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Apple (major), Beer (major), Grapefruit (major) and Siberian Cocklebur (major).

By severity: 7 major · 60 moderate · 15 minor.

From our pharmacist’s overview on the Methotrexate page

“The liver is where methotrexate and supplements clash most. Methotrexate (Rheumatrex, Otrexup, Rasuvo), used for rheumatoid arthritis, psoriasis, and certain cancers, can strain the liver on its own, and 38 of the 82 interacting ingredients on this list add liver risk of their own, alcohol included, which makes this a list to approach…”

Reviewed by 2 · Jul 18, 2026

Open the Methotrexate interaction page

How much people look this up

Where Lathyrus and Methotrexate 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 Lathyrus
Steady interest

#1,244 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Methotrexate
Top 5%

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

What is Lathyrus?

  • Food and famine crop in some regions
  • Source of dietary protein
  • Traditional folk remedies
  • Animal fodder

Lathyrus most often refers to the grass pea (Lathyrus sativus), a hardy legume eaten as food in parts of Asia and Africa. While it is nutritious, heavy or prolonged consumption is linked to a serious neurological disorder called lathyrism, so it is not recommended as a dietary supplement. There is no good evidence supporting Lathyrus for any specific health condition.

Lathyrus sativus · Fabaceae · Seeds (grass pea / chickling pea); occasionally other plant parts · Dried seeds, flour, cooked legume dishes; not commonly sold as a standardized supplement

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

Lathyrus: dosing

There is no established or standardized supplement dose for Lathyrus, and it is not recommended as a supplement. Because of the toxin it contains, larger and more frequent intake increases the risk of harm.If grass pea is part of your traditional diet, it is safest to eat it in moderation as one of many foods, and to prepare it by soaking and boiling. Do not rely on it as a main protein source.

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

Read the full Lathyrus monograph & all interactions
Medication

About Methotrexate

What Is Methotrexate Used For?

Brand names: Rheumatrex, Otrexup, Rasuvo, Reditrex

Methotrexate treats a wide range of serious conditions. In cancer care, it is used for acute lymphoblastic leukemia, non-Hodgkin lymphoma, osteosarcoma, breast cancer, head and neck cancer, and gestational trophoblastic neoplasia (a rare tumor related to pregnancy). It is also used to prevent and treat meningeal leukemia (cancer affecting the lining of the brain and spinal cord).

Outside of cancer, methotrexate is prescribed for adults with rheumatoid arthritis (RA), children with polyarticular juvenile idiopathic arthritis (a form of childhood arthritis), and adults with severe psoriasis that hasn't responded well to other treatments.

Most-Reported Side Effects for Methotrexate

From FAERS, the FDA’s public side-effect reporting system (489,806 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Rheumatoid arthritis 42,798 reports
Arthralgia 40,830 reports
Fatigue 33,049 reports
Nausea 28,999 reports
Joint swelling 25,026 reports
See full Methotrexate drug information
Keep checking

Other Drugs & Lathyrus

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

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

Lathyrus References

The 22 references that drive our Lathyrus 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. The Review of Natural Products by Facts and Comparisons. St. Louis, MO: Wolters Kluwer Co., 1999.
  2. Spencer, P. S. Food toxins, ampa receptors, and motor neuron diseases. Drug Metab Rev 1999;31(3):561-587. PubMed
  3. Porcel, S., Leon, F., Valero, A. M., Calderin, P. M., Cuevas, M., and Cuesta, E. A. Occupational rhinitis and asthma by Lathyrus sativus flour: characterization of allergens. J.Allergy Clin.Immunol. 2001;107(4):743-744. PubMed
  4. Drory, V. E., Rabey, M. J., and Cohn, D. F. Electrophysiologic features in patients with chronic neurolathyrism. Acta Neurol.Scand 1992;85(6):401-403. PubMed
  5. Krogsgaard-Larsen, P. and Hansen, J. J. Naturally-occurring excitatory amino acids as neurotoxins and leads in drug design. Toxicol Lett 1992;64-65 Spec No:409-416. PubMed
  6. Pratap Rudra, M. P., Singh, M. R., Junaid, M. A., Jyothi, P., and Rao, S. L. Metabolism of dietary ODAP in humans may be responsible for the low incidence of neurolathyrism. Clin Biochem 2004;37(4):318-322. PubMed
  7. Yan, Z. Y., Spencer, P. S., Li, Z. X., Liang, Y. M., Wang, Y. F., Wang, C. Y., and Li, F. M. Lathyrus sativus (grass pea) and its neurotoxin ODAP. Phytochemistry 2006;67(2):107-121. PubMed
  8. Anton, Girones M., de la Hoz, Caballer B., Munoz, Martin T., Cuevas, Agustin M., and Sanchez-Cano, M. Occupational rhinoconjunctivitis and asthma by exposure to Lathyrus sativus flour. Allergol.Immunopathol.(Madr.) 2005;33(6):326-328.
  9. Haimanot, R. T., Kidane, Y., Wuhib, E., Kalissa, A., Alemu, T., Zein, Z. A., and Spencer, P. S. Lathyrism in rural northwestern Ethiopia: a highly prevalent neurotoxic disorder. Int J Epidemiol. 1990;19(3):664-672. PubMed
  10. Spencer, P. S., Roy, D. N., Ludolph, A., Hugon, J., Dwivedi, M. P., and Schaumburg, H. H. Lathyrism: evidence for role of the neuroexcitatory aminoacid BOAA. Lancet 11-8-1986;2(8515):1066-1067. PubMed
  11. Valdivieso, R., Quirce, S., and Sainz, T. Bronchial asthma caused by Lathyrus sativus flour. Allergy 1988;43(7):536-539.
  12. Ludolph, A. C., Hugon, J., Dwivedi, M. P., Schaumburg, H. H., and Spencer, P. S. Studies on the aetiology and pathogenesis of motor neuron diseases. 1. Lathyrism: clinical findings in established cases. Brain 1987;110 ( Pt 1):149-165. PubMed
  13. Striefler, M., Cohn, D. F., Hirano, A., and Schujman, E. The central nervous system in a case of neurolathyrism. Neurology 1977;27(12):1176-1178.
  14. Spencer, P. S. and Schaumburg, H. H. Lathyrism: a neurotoxic disease. Neurobehav.Toxicol Teratol. 1983;5(6):625-629.
  15. Cohn, D. F. and Streifler, M. Intoxication by the chickling pea (Lathyrus sativus): nervous system and skeletal findings. Arch.Toxicol.Suppl 1983;6:190-193. PubMed

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 Lathyrus and Methotrexate Together: Common Questions

Is it safe to take Lathyrus with Methotrexate?
We do not list a known interaction between Lathyrus and Methotrexate. 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 Lathyrus and Methotrexate have any of the same side effects?
Yes — our sources link each of them separately to one 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.
Does Methotrexate interact with any supplements?
Yes. Methotrexate has documented interactions with 82 supplements in our database — Lathyrus is not one of them. The Methotrexate 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

Lathyrus monograph Uses, safety profile, and every drug interaction in one place Methotrexate drug information The full plain-English guide to this medication Methotrexate supplement interactions Every supplement checked against Methotrexate, 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 22 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Methotrexate and Lathyrus?

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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.