Drug & supplement interaction

Delta-9-tetrahydrocannabinol (thc) + Methotrexate

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

No Known Interaction

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Updated July 2026 · Pair last verified Sep 13, 2026

The bottom line No known interaction

We found no known interaction between Delta-9-tetrahydrocannabinol (thc) 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

Delta-9-tetrahydrocannabinol (thc) 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 Delta-9-tetrahydrocannabinol (thc) 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.

Delta-9-tetrahydrocannabinol (thc) safety at a glance

Delta-9-tetrahydro... overall Use caution THC is psychoactive, can impair judgment and coordination, and its legal status varies; use only under medical supervision.

Pregnancy Unsafe When used orally or inhaled. Cannabinoid constituents in cannabis, such as THC, pass through the placenta and can reduce fetal growth and increase the risk for... Read the full pregnancy detail

Breastfeeding Likely Unsafe When used orally or inhaled. THC is concentrated and excreted in breast milk for longer than 6 weeks after cessation of use; prolonged use of cannabis containin... 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 Delta-9-tetrahydrocannabinol (thc)? 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. Delta-9-tetrahydrocannabinol (thc) has documented interactions with 16 drug classes — the most serious being alcohol (ethanol) (moderate), anesthesia (moderate) and anticoagulant/antiplatelet drugs (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

Delta-9-tetrahydrocannabinol (thc) Does Interact With Other Medications

Delta-9-tetrahydrocannabinol (thc) has 762 moderate, 336 minor known drug interactions in our database — Methotrexate isn’t one of them. If you take anything else, check it against the full list below.

Moderate 762 Minor 336 No known interaction 1,732 (incl. Methotrexate)

Taking anything else?

Check Another of Your Medications Against Delta-9-tetrahydrocannabinol (thc)

Covers the 2,830 medications we’ve checked against Delta-9-tetrahydrocannabinol (thc). Pick one to open its full report.

What to actually watch for

No Interaction Found — But Data Suggests Delta-9-tetrahydrocannabinol (thc) 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. 6 of them are worth acting on rather than waiting out — marked below.

Pancreatitis Worth acting on Additional detail

Delta-9-tetrahydrocannabinol (thc)

“There is limited reliable information available about the adverse effects associated with pure THC. When inhaled or used orally, cannabis can cause various adverse effects, many of which are thought to be related to THC.”

Delta-9-tetrahydrocannabinol (thc) · Natural Medicines adverse-effect record, reported in arrhythmia.

“Cannabis containing THC has been associated with endocrine adverse effects, including weight gain, worsened glycemic control, and acute pancreatitis. However, it is unclear if these adverse effects are due to the THC constituent of cannabis, other constituents, or a combination. For more information on cannabis-related adverse effects, see the Cannabis monograph.”

Delta-9-tetrahydrocannabinol (thc) · Natural Medicines adverse-effect record, reported in pancreatitis.

Methotrexate

Listed in the ADVERSE REACTIONS section of the FDA label for Methotrexate. Read the label on DailyMed ›
A severe skin reaction Worth acting on Additional detail
Delta-9-tetrahydrocannabinol (thc)
“Cannabis containing THC has been associated with dermatologic adverse effects, including erythema multiforme-like recurrent drug eruption. However, it is unclear if these adverse effects are due to the THC constituent of cannabis, other constituents, or a combination.”

Delta-9-tetrahydrocannabinol (thc) · Natural Medicines adverse-effect record, reported in erythema.
1 source cited

110258. Highlights of prescribing information. MARINOL (dronabinol) capsules, for oral use, CIII. August 2017. Available at: https://www.accessdata.fda.gov/drugsatfda_docs/label/2017/018651s029lbl.pdf. Accessed April 10, 2023.
Methotrexate

Listed in the ADVERSE REACTIONS section of the FDA label for Methotrexate. Read the label on DailyMed ›
Seizures Worth acting on Additional detail

Delta-9-tetrahydrocannabinol (thc)

Recorded for Delta-9-tetrahydrocannabinol (thc) in the same Natural Medicines adverse-effect record shown under Pancreatitis above.

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
Delta-9-tetrahydrocannabinol (thc)
“A case of acute kidney injury has been reported in a 94-year-old adult after consumption of cannabis containing THC; it was likely caused by pre-existing mild dehydration related to a lack of fluid intake, followed by cannabis-induced diarrhea.”

Delta-9-tetrahydrocannabinol (thc) · Natural Medicines adverse-effect record, reported in diarrhea.
1 source cited

111071. Moussa MK, Hall MAK, Akwe J. Cannabis-induced acute encephalopathy in a 94-year-old woman due to family administration of cannabidiol (CBD) products: A case report. Cureus 2023;15(4):e37927.
Methotrexate

Listed in the ADVERSE REACTIONS section of the FDA label for Methotrexate. Read the label on DailyMed ›
Hives Worth acting on Additional detail
Delta-9-tetrahydrocannabinol (thc)
“Taking a prescription drug called dronabinol (Marinol), a synthetic form of THC, has been associated with hypersensitivity reactions, including lip swelling and oral lesions, skin hives, rash, or flushing, or throat tightness.”

Delta-9-tetrahydrocannabinol (thc) · Natural Medicines adverse-effect record, reported in urinary tract infections (utis).
2 sources cited

110258. Highlights of prescribing information. MARINOL (dronabinol) capsules, for oral use, CIII. August 2017. Available at: https://www.accessdata.fda.gov/drugsatfda_docs/label/2017/018651s029lbl.pdf. Accessed April 10, 2023.

110257. Pisani S, McGoohan K, Velayudhan L, Bhattacharyya S. Safety and Tolerability of Natural and Synthetic Cannabinoids in Older Adults: A Systematic Review and Meta-Analysis of Open-Label Trials and Observational Studies. Drugs Aging 2021;38(10):887-910. PubMed
Methotrexate

Listed in the ADVERSE REACTIONS section of the FDA label for Methotrexate. Read the label on DailyMed ›
A higher chance of infection Worth acting on Additional detail

Delta-9-tetrahydrocannabinol (thc)

Recorded for Delta-9-tetrahydrocannabinol (thc) in the same Natural Medicines adverse-effect record shown under Hives above.

Methotrexate

Listed in the ADVERSE REACTIONS section of the FDA label for Methotrexate. Read the label on DailyMed ›
Erection problems Additional detail
Delta-9-tetrahydrocannabinol (thc)
“A meta-analysis of clinical research involving adults with a mean age of at least 50 years shows that increasing the dose of natural or synthetic THC in cannabinoid-based medicines is associated with a modest increase in the rate of male impotence.

Cannabis containing THC has been associated with other genitourinary adverse effects, including priapism and abnormal menstruation.”

Delta-9-tetrahydrocannabinol (thc) · Natural Medicines adverse-effect record, reported in erectile dysfunction (ed).
1 source cited

105559. Velayudhan L, McGoohan K, Bhattacharyya S. Safety and tolerability of natural and synthetic cannabinoids in adults aged over 50 years: A systematic review and meta-analysis. PLoS Med. 2021;18(3):e1003524. PubMed
Methotrexate

Listed in the ADVERSE REACTIONS section of the FDA label for Methotrexate. Read the label on DailyMed ›
Ringing in the ears Additional detail
Delta-9-tetrahydrocannabinol (thc)
“A meta-analysis of clinical research involving adults with a mean age of at least 50 years shows that increasing the dose of natural or synthetic THC in cannabinoid-based medicines is associated with a modest increase in overall adverse effects, including visual symptoms.

Cannabis containing THC has been associated with other ocular or otic adverse effects, including dry eye, reddening of the eyes, and tinnitus.”

Delta-9-tetrahydrocannabinol (thc) · Natural Medicines adverse-effect record, reported in dry eye.
1 source cited

105559. Velayudhan L, McGoohan K, Bhattacharyya S. Safety and tolerability of natural and synthetic cannabinoids in adults aged over 50 years: A systematic review and meta-analysis. PLoS Med. 2021;18(3):e1003524. PubMed
Methotrexate

Listed in the ADVERSE REACTIONS section of the FDA label for Methotrexate. Read the label on DailyMed ›
Sore throat Additional detail
Delta-9-tetrahydrocannabinol (thc)
“Using a specific oromucosal spray that contains THC 2.7 mg and cannabidiol 2.5 mg per actuation (Sativex, GW Pharmaceuticals) may cause pharyngitis, hoarseness, and throat irritation.”

Delta-9-tetrahydrocannabinol (thc) · Natural Medicines adverse-effect record, reported in myasthenia gravis.
1 source cited

61759. Rog, D. J., Nurmikko, T. J., Friede, T., and Young, C. A. Randomized, controlled trial of cannabis-based medicine in central pain in multiple sclerosis. Neurology 9-27-2005;65(6):812-819. PubMed
Methotrexate

Listed in the ADVERSE REACTIONS section of the FDA label for Methotrexate. Read the label on DailyMed ›
Sweating Additional detail
Delta-9-tetrahydrocannabinol (thc)
“Cannabinoids such as THC can increase anxiety, confusion, depressed mood, and hallucinations, and reduce motivation. Cannabis dabbing, the making of a waxy product with extremely high concentrations of THC, is thought to increase the risk of anxiety, agitation, paranoia, and psychosis.”

Delta-9-tetrahydrocannabinol (thc) · Natural Medicines adverse-effect record, reported in anxiety.
6 sources cited

96384. Whiting PF, Wolff RF, Deshpande S, et al. Cannabinoids for medical use: A systematic review and meta-analysis. JAMA. 2015;313(24):2456-73. PubMed

110252. Murray CH, Glazer JE, Lee R, Nusslock R, de Wit H. ?9-THC reduces reward-related brain activity in healthy adults. Psychopharmacology (Berl) 2022;239(9):2829-2840. PubMed

110257. Pisani S, McGoohan K, Velayudhan L, Bhattacharyya S. Safety and Tolerability of Natural and Synthetic Cannabinoids in Older Adults: A Systematic Review and Meta-Analysis of Open-Label Trials and Observational Studies. Drugs Aging 2021;38(10):887-910. PubMed

108341. Mullins MF. Cannabis dabbing: An emerging trend. Nursing. 2021;51(5):46-50.

91914. Hancock-Allen JB, Barker L, VanDyke M, Holmes DB. Notes from the Field: Death Following Ingestion of an Edible Marijuana Product--Colorado, March 2014. MMWR Morb Mortal Wkly Rep. 2015;64(28):771-2. PubMed

103796. Monte AA, K Shelton SK, Mills E., Acute Illness Associated With Cannabis Use, by Route of Exposure: An Observational Study. Ann Intern Med. 2019 Apr 16;170(8):531-537. PubMed
Methotrexate

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

Showing the 10 most notable of 22 shared effects — ranked by how unusual each one is, not just whether both lists mention it.

Reported for Delta-9-tetrahydrocannabinol (thc) but not commonly for Methotrexate: raised blood pressure, an irregular heartbeat, a heart attack and memory problems.

Effects for Methotrexate come from the ADVERSE REACTIONS section of its FDA label; effects for Delta-9-tetrahydrocannabinol (thc) 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

Delta-9-tetrahydrocannabinol (thc) in Pregnancy & Breastfeeding

Pregnancy Unsafe

When used orally or inhaled. Cannabinoid constituents in cannabis, such as THC, pass through the placenta and can reduce fetal growth and increase the risk for preterm birth. Cannabis use during pregnancy is also associated with placental abruption, stillbirth, preterm delivery, fetal abnormalities, low birth weight, small for gestational age, increased need for neonatal intensive care, and childhood leukemia. Prenatal cannabis use has also been associated with long-term adverse developmental effects in the offspring, such as worsened cognition, increased risk for neurodevelopmental disorders such as autism spectrum disorder, and increased risk for psychological issues during adolescence. Due to the observational nature of these studies, it is unclear if cannabis causes these adverse effects. Umbilical artery Doppler scans also show that cannabis use can increase placental vascular resistance. Cannabis use during pregnancy has been associated with increased risk of anemia and hypertension in the mother. Although the safety of pure THC has not been investigated during pregnancy, it is likely that THC is at least partially responsible for these safety concerns. The rate of negative fetal outcomes due to cannabis use during pregnancy may have been previously underestimated due to reliance on maternal self-reporting of use. Recent programs requiring maternal urine toxicology testing have increased awareness of maternal cannabis use and suggest that negative fetal outcomes occur more frequently than previously recorded.

Lactation Likely Unsafe

When used orally or inhaled. THC is concentrated and excreted in breast milk for longer than 6 weeks after cessation of use; prolonged use of cannabis containing THC during lactation has been associated with delayed motor development. Observational research in mothers who successfully abstained from cannabis use for 6 weeks (confirmed by a negative THC urine screen) after smoking cannabis prenatally at least twice weekly, found that THC levels in breastmilk increased during the first 2 weeks of abstinence and then decreased but remained detectable at 6 weeks. For patients planning to breastfeed, recommend abstaining from THC use prenatally and during lactation. Recommendations to discard breastmilk until THC levels are undetectable are not practical, as this may take more than 6 weeks.

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 Delta-9-tetrahydrocannabinol (thc) 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 Delta-9-tetrahydrocannabinol (thc) 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 Delta-9-tetrahydrocannabinol (thc) 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 Delta-9-tetrahydrocannabinol (thc) 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 Delta-9-tetrahydrocannabinol (thc)

Top half

#513 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 Delta-9-tetrahydrocannabinol (thc) reference on this page ↓
Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Delta-9-tetrahydrocannabinol (thc) 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 Dr. Brian Staiger, PharmD, BCPS.

Supplement

About Delta-9-tetrahydrocannabinol (thc)

What is Delta-9-tetrahydrocannabinol (thc)?

Chronic or nerve pain
Nausea and vomiting from chemotherapy
Appetite loss and weight loss
Muscle spasticity
Sleep problems
Anxiety and stress

THC is the main mind-altering compound in cannabis and is best known for causing a 'high.' A prescription form (dronabinol) is approved for chemotherapy-related nausea and appetite loss, but for most other uses the evidence is mixed or limited, and THC can impair thinking and driving. It should be avoided in pregnancy and breastfeeding and used only with medical guidance.

Cannabis sativa · Cannabaceae · Flowering tops and resin of the cannabis plant (THC is a single cannabinoid isolated or concentrated from these) · Prescription oral capsules (dronabinol), oral oil/solution, dried flower, vape and concentrate products (such as butane hash oil/dabs), tinctures, and edibles

An interaction check asks whether these two react with each other — it does not ask whether Delta-9-tetrahydrocannabinol (thc) is a good idea for someone in your situation. Here is what our Delta-9-tetrahydrocannabinol (thc) record says about it on its own.

Delta-9-tetrahydrocannabinol (thc): dosing

There is no single standard dose of THC for general use, and the right amount varies widely from person to person based on tolerance, the product, and the reason for use. Concentrated products contain much more THC than dried flower, which makes accidental overuse easy.For prescription products such as dronabinol, a doctor sets the dose.

From our Delta-9-tetrahydrocannabinol (thc) monograph — the full record covers uses, side effects and every documented interaction.

Read the full Delta-9-tetrahydrocannabinol (thc) 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 & Delta-9-tetrahydrocannabinol (thc)

Browse every other medication we’ve checked against Delta-9-tetrahydrocannabinol (thc) — both the ones with a known interaction and the ones without. Select any drug for the full detail.

0Major

762Moderate

336Minor

1,731No known interaction

762 Moderate 336 Minor 1,731 No interaction

Moderate

762 interactions

Showing 60 of 762 moderate interactions — see all 762 on the Delta-9-tetrahydrocannabinol (thc) page.

Minor

336 interactions

Showing 60 of 336 minor interactions — see all 336 on the Delta-9-tetrahydrocannabinol (thc) page.

No interaction 1,731 drugs checked — show the list

We also checked Delta-9-tetrahydrocannabinol (thc) against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 1,731 medications checked with no known interaction — see the full Delta-9-tetrahydrocannabinol (thc) list.

See the full Delta-9-tetrahydrocannabinol (thc) interactions page

See every supplement checked against Methotrexate, ranked by severity

Evidence & sources

Delta-9-tetrahydrocannabinol (thc) References

The 76 references that drive our Delta-9-tetrahydrocannabinol (thc) 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.

Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.
Hebel SK, ed. Drug Facts and Comparisons. 52nd ed. St. Louis: Facts and Comparisons, 1998.
Tyrey L. Delta 9-Tetrahydrocannabinol: a potent inhibitor of episodic luteinizing hormone secretion. J Pharmacol Exp Ther 1980;213:306-8. DOI
Briggs GB, Freeman RK, Yaffe SJ. Drugs in Pregnancy and Lactation. 5th ed. Philadelphia, PA: Lippincott Williams & Wilkins; 1998.
Marinol Prescribing Information. Solvay Pharmaceuticals, Rev March 2008. Available at: http://www.solvaypharmaceuticals-us.com/static/wma/pdf/1/3/2/5/0/004InsertText500012RevMar2008.pdf (Accessed 2 July 2009).
Yamreudeewong W, Wong HK, Brausch LM, Pulley KR. Probable interaction between warfarin and marijuana smoking. Ann Pharmacother 2009;43:1347-53. PubMed
Pellinen, P., Honkakoski, P., Stenback, F., Niemitz, M., Alhava, E., Pelkonen, O., Lang, M. A., and Pasanen, M. Cocaine N-demethylation and the metabolism-related hepatotoxicity can be prevented by cytochrome P450 3A inhibitors. Eur.J Pharmacol 1-3-1994;2 PubMed
Johnson, E. M. Substance abuse and women's health. Public Health Rep. 1987;102(4 Suppl):42-48.
Astley, S. J. and Little, R. E. Maternal marijuana use during lactation and infant development at one year. Neurotoxicol.Teratol. 1990;12(2):161-168. PubMed
Levy, R., Schurr, A., Nathan, I., Dvilanski, A., and Livne, A. Impairment of ADP-induced platelet aggregation by hashish components. Thromb.Haemost. 12-31-1976;36(3):634-640. DOI
Sheweita, S. A. Narcotic drugs change the expression of cytochrome P450 2E1 and 2C6 and other activities of carcinogen-metabolizing enzymes in the liver of male mice. Toxicology 9-30-2003;191(2-3):133-142. PubMed
Rog, D. J., Nurmikko, T. J., Friede, T., and Young, C. A. Randomized, controlled trial of cannabis-based medicine in central pain in multiple sclerosis. Neurology 9-27-2005;65(6):812-819. PubMed
Perras, C. Sativex for the management of multiple sclerosis symptoms. Issues Emerg.Health Technol. 2005;(72):1-4.
Zhu, H. J., Wang, J. S., Markowitz, J. S., Donovan, J. L., Gibson, B. B., Gefroh, H. A., and Devane, C. L. Characterization of P-glycoprotein inhibition by major cannabinoids from marijuana. J Pharmacol Exp.Ther. 2006;317(2):850-857. PubMed
Holland, M. L., Panetta, J. A., Hoskins, J. M., Bebawy, M., Roufogalis, B. D., Allen, J. D., and Arnold, J. C. The effects of cannabinoids on P-glycoprotein transport and expression in multidrug resistant cells. Biochem.Pharmacol 4-14-2006;71(8):1146-115 PubMed
Rog, D. J., Nurmikko, T. J., and Young, C. A. Oromucosal delta9-tetrahydrocannabinol/cannabidiol for neuropathic pain associated with multiple sclerosis: an uncontrolled, open-label, 2-year extension trial. Clin Ther. 2007;29(9):2068-2079.
Reece, A. S. Chronic toxicology of cannabis. Clin Toxicol.(Phila) 2009;47(6):517-524. PubMed
Lynch, M. E. and Campbell, F. Cannabinoids for treatment of chronic non-cancer pain; a systematic review of randomized trials. Br.J.Clin.Pharmacol. 2011;72(5):735-744. PubMed
Li, M. C., Brady, J. E., DiMaggio, C. J., Lusardi, A. R., Tzong, K. Y., and Li, G. Marijuana use and motor vehicle crashes. Epidemiol.Rev. 2012;34(1):65-72. PubMed
Richards, B. L., Whittle, S. L., and Buchbinder, R. Neuromodulators for pain management in rheumatoid arthritis. Cochrane.Database.Syst.Rev. 2012;1:CD008921. PubMed
Asbridge, M., Hayden, J. A., and Cartwright, J. L. Acute cannabis consumption and motor vehicle collision risk: systematic review of observational studies and meta-analysis. BMJ 2012;344:e536. PubMed
Formukong, E. A., Evans, A. T., and Evans, F. J. The inhibitory effects of cannabinoids, the active constituents of Cannabis sativa L. on human and rabbit platelet aggregation. J.Pharm.Pharmacol. 1989;41(10):705-709.
Hollister, L. E. Interactions of cannabis with other drugs in man. NIDA Res.Monogr 1986;68:110-116. DOI
Hancock-Allen JB, Barker L, VanDyke M, Holmes DB. Notes from the Field: Death Following Ingestion of an Edible Marijuana Product--Colorado, March 2014. MMWR Morb Mortal Wkly Rep. 2015;64(28):771-2. PubMed
Huson HB, Granados TM, Rasko Y. Surgical considerations of marijuana use in elective procedures. Heliyon. 2018;4(9):e00779. PubMed
Goyal H, Awad HH, Ghali JK. Role of cannabis in cardiovascular disorders. J Thorac Dis. 2017;9(7):2079-2092. PubMed
Gunn JK, Rosales CB, Center KE, et al. Prenatal exposure to cannabis and maternal and child health outcomes: a systematic review and meta-analysis. BMJ Open. 2016;6(4):e009986. PubMed
Whiting PF, Wolff RF, Deshpande S, et al. Cannabinoids for medical use: A systematic review and meta-analysis. JAMA. 2015;313(24):2456-73. PubMed
Shere A, Goyal H. Cannabis can augment thrombolytic properties of rtPA: Intracranial hemorrhage in a heavy cannabis user. Am J Emerg Med. 2017;35(12):1988.e1-1988.e2. PubMed
Duran M, Pérez E, Abanades S, et al. Preliminary efficacy and safety of an oromucosal standardized cannabis extract in chemotherapy-induced nausea and vomiting. Br J Clin Pharmacol. 2010;70(5):656-63. PubMed
Bonnet U, Preuss UW. The cannabis withdrawal syndrome: current insights. Subst Abuse Rehabil. 2017;8:9-37. PubMed
Damkier P, Lassen D, Christensen MMH, Madsen KG, Hellfritzsch M, Pottegård A. Interaction between warfarin and cannabis. Basic Clin Pharmacol Toxicol. 2019;124(1):28-31. PubMed
Product information for Marinol. AbbVie. North Chicago, IL 60064. August 2017. Available at: https://www.accessdata.fda.gov/drugsatfda_docs/label/2017/018651s029lbl.pdf.
Corsi DJ, Walsh L, Weiss D, et al. Association Between Self-reported Prenatal Cannabis Use and Maternal, Perinatal, and Neonatal Outcomes. JAMA. 2019 Jul 9;322(2):145-152. PubMed
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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.

Related: nutrient depletion

Methotrexate Is Linked to Lower Levels of One Nutrient

Natural Medicines records Methotrexate as a medicine that can lower these. This is not an interaction with Delta-9-tetrahydrocannabinol (thc) — it is a separate effect of the medicine, and it is a reason some people are advised to supplement rather than to avoid one:

FOLIC ACID›

Read the full Methotrexate nutrient depletion report ›

Depletion records come from the licensed Natural Medicines database. Do not start a supplement on the strength of this page — ask your pharmacist or doctor whether it applies to you.

Pharmacist Counseling Corner

Taking Delta-9-tetrahydrocannabinol (thc) and Methotrexate Together: Common Questions

Is it safe to take Delta-9-tetrahydrocannabinol (thc) with Methotrexate?

We do not list a known interaction between Delta-9-tetrahydrocannabinol (thc) 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 Delta-9-tetrahydrocannabinol (thc) and Methotrexate have any of the same side effects?

Yes — our sources link each of them separately to 10 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 Delta-9-tetrahydrocannabinol (thc) and Methotrexate combination checked?

Interactions in our licensed database are recorded against drug classes. Methotrexate is filed under 6 classifications, and Delta-9-tetrahydrocannabinol (thc) has documented interactions with 16 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 Delta-9-tetrahydrocannabinol (thc) interact with any other medications?

Yes. Delta-9-tetrahydrocannabinol (thc) has 1,098 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 — Delta-9-tetrahydrocannabinol (thc) 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

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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.