Drug & supplement interaction

Dolomite + 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 Dolomite 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

Dolomite 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 Dolomite 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.

Dolomite safety at a glance

Dolomite overall Avoid Dolomite may be contaminated with heavy metals such as lead, arsenic, and mercury.
Pregnancy Avoid Avoid during pregnancy because of possible heavy metal contamination, especially lead.
Breastfeeding Possibly 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 Dolomite? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Methotrexate

Interactions in our licensed database are recorded against drug classes, not just single drug names. Methotrexate is filed under 6 classifications — including organic anion-transporting polypeptide substrates (oatp), organic anion transporter 3 (oat3) substrates, hepatotoxic drugs. Dolomite has documented interactions with 7 drug classes — the most serious being thiazide diuretics (major), bisphosphonates (moderate) and levothyroxine (synthroid, others) (moderate) — and none of Methotrexate’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

Dolomite Does Interact With Other Medications

Dolomite has 56 major, 72 moderate known drug interactions in our database — Methotrexate isn’t one of them. If you take anything else, check it against the full list below.

Major 56 Moderate 72 No known interaction 2,702 (incl. Methotrexate)
Taking anything else?

Check Another of Your Medications Against Dolomite

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

What to actually watch for

No Interaction Found — But Data Suggests Dolomite and Methotrexate May Share Several of the Same Side Effects

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. 2 of them are worth acting on rather than waiting out — marked below.

  • Seizures Worth acting on Additional detail

    Dolomite

    “Orally, some dolomite products are contaminated with heavy metals including aluminum, arsenic, lead, mercury, nickel, and others that may cause heavy metal poisoning. Contaminated products have induced seizure activity in patients with otherwise well-controlled seizure disorders.”

    Dolomite · Natural Medicines adverse-effect record, reported in epilepsy.

    2 sources cited
    1. 997. Roberts HJ. Potential toxicity due to dolomite and bonemeal. South Med J 1983;76:556-9. PubMed
    2. 11719. Scelfo GM, Flegal AR. Lead in calcium supplements. Environ Health Perspect 2000;108:309-19. PubMed

    Methotrexate

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

  • Kidney problems Worth acting on Additional detail

    Dolomite

    “Dolomite contains calcium and magnesium. Large amounts of calcium carbonate can cause hypercalcemia and alkalosis (9). Furthermore, large amounts of magnesium may cause hypermagnesemia (9) with symptoms including thirst, hypotension, drowsiness, confusion, loss of tendon reflexes, muscle weakness, respiratory depression, cardiac arrhythmias, coma, cardiac arrest, and death (9).”

    Dolomite · Natural Medicines adverse-effect record, reported in arrhythmia.

    3 sources cited
    1. 9. Martindale W. Martindale the Extra Pharmacopoeia. Pharmaceutical Press, 1999.
    2. 48411. Steenkamp, V., Stewart, M. J., Curowska, E., and Zuckerman, M. A severe case of multiple metal poisoning in a child treated with a traditional medicine. Forensic Sci.Int. 8-28-2002;128(3):123-126. PubMed
    3. 997. Roberts HJ. Potential toxicity due to dolomite and bonemeal. South Med J 1983;76:556-9. PubMed

    “Dolomite contains calcium and magnesium. Calcium used orally can cause gastrointestinal irritation and constipation (9). Magnesium can cause gastrointestinal irritation, nausea, vomiting, and diarrhea (9,15).”

    Dolomite · Natural Medicines adverse-effect record, reported in constipation.

    4 sources cited
    1. 9. Martindale W. Martindale the Extra Pharmacopoeia. Pharmaceutical Press, 1999.
    2. 15. McEvoy GK, ed. AHFS Drug Information. Bethesda, MD: American Society of Health-System Pharmacists, 1998.
    3. 48411. Steenkamp, V., Stewart, M. J., Curowska, E., and Zuckerman, M. A severe case of multiple metal poisoning in a child treated with a traditional medicine. Forensic Sci.Int. 8-28-2002;128(3):123-126. PubMed
    4. 997. Roberts HJ. Potential toxicity due to dolomite and bonemeal. South Med J 1983;76:556-9. PubMed

    Methotrexate

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

  • Cough Additional detail

    Dolomite

    “In a group of workers involved with digging and excavating dolomite, symptoms of exposure included cough, phlegm, wheezing, and shortness of breath. However, there was no increased risk in abnormalities in chest radiographs.”

    Dolomite · Natural Medicines adverse-effect record, reported in cough.

    1 source cited
    1. 96058. Neghab M, Abedini R, Soltanzadeh A, et al. Respiratory disorders associated with heavy inhalation exposure to dolomite dust. Iran Red Crescent Med J. 2012;14(9):549-57.

    Methotrexate

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

  • Low blood pressure / Drowsiness Additional detail

    Dolomite

    Recorded for Dolomite in the same Natural Medicines adverse-effect record shown under Kidney problems above.

    Methotrexate

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

  • Nausea / Diarrhea / Vomiting reported in 5.9% of FDA reports for Methotrexate Additional detail

    Dolomite

    “Orally, dolomite may be unsafe due to concerns that it may be contaminated with heavy metals, including aluminum, arsenic, lead, mercury, nickel, and others.

    Most Common Adverse Effects:

    Orally: Belching, constipation, diarrhea, flatulence, nausea, and vomiting.

    Serious Adverse Effects (Rare):

    Orally: Dermatologic, gastrointestinal, hematologic, and neurologic disorders caused by heavy metals in contaminated dolomite…”

    Dolomite · Natural Medicines adverse-effect record, reported in constipation.

    Methotrexate

    Listed in the ADVERSE REACTIONS section of the FDA label for Methotrexate, and in voluntary FDA adverse-event reports. Read the label on DailyMed ›

Reported for Dolomite but not commonly for Methotrexate: an irregular heartbeat, shortness of breath, muscle weakness and constipation.

Effects for Methotrexate come from the ADVERSE REACTIONS section of its FDA label; effects for Dolomite 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

Dolomite in Pregnancy & Breastfeeding

Lactation Possibly 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 Dolomite 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 Dolomite 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 Dolomite 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

One more smart check

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

We hold 3 real supplement products containing Dolomite, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Dolomite. Even though Dolomite itself has no known interaction with Methotrexate, 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 Dolomite 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 Dolomite
Steady interest

#778 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 Dolomite reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Dolomite and Methotrexate records this page draws on were last updated July 11, 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 Dolomite

What is Dolomite?

Dolomite
  • Source of calcium
  • Source of magnesium
  • Bone health support
  • Antacid for heartburn
  • Mineral supplementation

Dolomite is a natural mineral that provides both calcium and magnesium. However, many health authorities advise against using it because dolomite products have been found to contain heavy metals like lead, arsenic, and mercury, and safer, better-tested calcium and magnesium supplements are widely available.

Mineral rock (calcium magnesium carbonate) · Tablets, chewable tablets, powder, capsules

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

Dolomite: dosing

There is no well-established or recommended dose for dolomite, and we do not recommend it because of contamination concerns. They can help you reach your nutrient needs without the risk of heavy metals.

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

Read the full Dolomite 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 & Dolomite

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

56Major
72Moderate
0Minor
2,701No known interaction
56 Major 72 Moderate 2,701 No interaction
Major

56 interactions

Moderate

72 interactions

Showing 60 of 72 moderate interactions — see all 72 on the Dolomite page.

No interaction 2,701 drugs checked — show the list

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

Showing the 60 most looked-up of 2,701 medications checked with no known interaction — see the full Dolomite list.

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

Dolomite References

The 16 references that drive our Dolomite 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. Martindale W. Martindale the Extra Pharmacopoeia. Pharmaceutical Press, 1999.
  2. McEvoy GK, ed. AHFS Drug Information. Bethesda, MD: American Society of Health-System Pharmacists, 1998.
  3. Roberts HJ. Potential toxicity due to dolomite and bonemeal. South Med J 1983;76:556-9. PubMed
  4. Friedman PA, Bushinsky DA. Diuretic effects on calcium metabolism. Semin Nephrol 1999;19:551-6.
  5. Murry JJ, Healy MD. Drug-mineral interactions: a new responsibility for the hospital dietician. J Am Diet Assoc 1991;91:66-73.
  6. Butner LE, Fulco PP, Feldman G, et al. Calcium carbonate-induced hypothyroidism. Ann Intern Med 2000:132:595. PubMed
  7. Schneyer CR. Calcium carbonate and reduction of levothyroxine efficacy. JAMA 1998;279:750. PubMed
  8. Singh N, Singh PN, Hershman JM. Effect of calcium carbonate on the absorption of levothyroxine. JAMA 2000;283:2822-5. PubMed
  9. Ryan MP. Diuretics and potassium/magnesium depletion. Directions for treatment. Am J Med 1987;82:38-47.. PubMed
  10. Hollifield JW. Magnesium depletion, diuretics, and arrhythmias. Am J Med 1987;82:30-7.. PubMed
  11. Heidenreich O. Mode of action of conventional and potassium-sparing diuretics--aspects with relevance to Mg-sparing effects. Magnesium 1984;3:248-56..
  12. Kahela P, Anttila M, Tikkanen R, Sundquist H. Effect of food, food constituents and fluid volume on the bioavailability of sotalol. Acta Pharmacol Toxicol (Copenh) 1979;44:7-12.. PubMed
  13. Pletz MW, Petzold P, Allen A, et al. Effect of calcium carbonate on bioavailability of orally administered gemifloxacin. Antimicrob Agents Chemother 2003;47:2158-60.. PubMed
  14. Scelfo GM, Flegal AR. Lead in calcium supplements. Environ Health Perspect 2000;108:309-19. PubMed
  15. Steenkamp, V., Stewart, M. J., Curowska, E., and Zuckerman, M. A severe case of multiple metal poisoning in a child treated with a traditional medicine. Forensic Sci.Int. 8-28-2002;128(3):123-126. 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 Dolomite and Methotrexate Together: Common Questions

Is it safe to take Dolomite with Methotrexate?
We do not list a known interaction between Dolomite 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 Dolomite and Methotrexate have any of the same side effects?
Yes — our sources link each of them separately to 8 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.
How was the Dolomite and Methotrexate combination checked?
Interactions in our licensed database are recorded against drug classes. Methotrexate is filed under 6 classifications, and Dolomite has documented interactions with 7 drug classes — none of Methotrexate'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 Dolomite interact with any other medications?
Yes. Dolomite has 128 documented drug interactions in our database — Methotrexate 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 Methotrexate interact with any supplements?
Yes. Methotrexate has documented interactions with 82 supplements in our database — Dolomite 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

Dolomite 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 16 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Methotrexate and Dolomite?

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.