Herb & supplement monograph

Tea Tree Oil Drug Interactions, Uses, Effectiveness, Safety & More

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Interaction report

Drugs that interact with Tea Tree Oil

0 medications have a known interaction with Tea Tree Oil, graded by severity. Select any drug for the full evidence-based detail.

We don’t currently list any known drug interactions for Tea Tree Oil. This doesn’t guarantee none exist — always confirm with your pharmacist before combining supplements with your medications.

Read The List Like a Pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

  • Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
  • Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
  • Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
  • No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

  • Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
  • Probable. Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
  • Possible. Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists
  • Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

  • Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
  • Each drug listed above links to the full report for that exact Tea Tree Oil combination — clinical detail, likelihood, evidence level, and citations.
  • Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.
Monograph

Tea Tree Oil: Uses, Safety & Side Effects

The bottom line

Tea tree oil is an essential oil used on the skin for acne, fungal infections, and other skin problems, with some supportive but limited evidence. It is for topical use only and should never be swallowed, as it can be toxic. Always dilute it, do a patch test first, and check with your pharmacist or doctor before using.

Tea Tree Oil
Scientific name
Melaleuca alternifolia
Family
Myrtaceae
Part used
Leaves and twigs (steam-distilled into essential oil)
Common forms
Essential oil, creams, gels, ointments, soaps, shampoos, mouthwash
People commonly use it for
  • Acne
  • Fungal skin infections (athlete's foot, nail fungus)
  • Dandruff
  • Minor wounds and insect bites
  • Lice

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance
OverallUse caution

Generally safe when used diluted on the skin, but it is toxic if swallowed.

PregnancyPossibly Safe

When used topically and appropriately.

Read the full pregnancy detail
BreastfeedingPossibly Safe

When used topically and appropriately.

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Jump to a section

Overview

Tea tree oil is an essential oil made from the leaves of the Melaleuca alternifolia plant, a small tree native to Australia. The leaves are steam-distilled to create a strong-smelling oil that people have used for many years in traditional and folk medicine.

Today it is a popular ingredient in skincare and personal-care products. You will find it in acne treatments, antifungal creams, shampoos, soaps, and mouthwashes. It is used on the skin only and should not be swallowed.

How it works

Tea tree oil contains many natural compounds. One of the most studied is terpinen-4-ol, which researchers believe gives the oil much of its activity against bacteria, fungi, and possibly inflammation.

In laboratory studies, tea tree oil can slow or kill certain microbes and may calm skin redness and swelling. However, much of this work is done in test tubes or on animals, so it does not always predict how well the oil works on real skin conditions in people.

Effectiveness

Does Tea Tree Oil work?

Evidence overview · 33 uses evaluated
3 Possibly effective 30 Insufficient evidence
How to read these evidence grades

Natural Medicines’ 7-point scale. We show each rating’s label word-for-word.

1EffectiveStrong, consistent evidence it works.
2Likely EffectiveGood evidence, though not yet conclusive.
3Possibly EffectiveSome evidence suggests a benefit.
4Possibly IneffectiveSome evidence it may not help.
5Likely IneffectiveFairly strong evidence it doesn’t help.
6IneffectiveStrong evidence it doesn’t work.
7Insufficient Reliable Evidence to RateToo little research to say either way.
Possibly Effective Acne
Rating & evidence shown verbatim from Natural Medicines

Some clinical research shows that topical tea tree oil seems to improve symptoms of acne in adults and adolescents.

Possibly Effective Onychomycosis
Rating & evidence shown verbatim from Natural Medicines

Some clinical research suggests that topical pure tea tree oil seems to be beneficial for onychomycosis. It is unclear if the diluted oil is beneficial.

Possibly Effective Tinea pedis
Rating & evidence shown verbatim from Natural Medicines

Some clinical research suggests that topical tea tree oil 25% or 50% seems to be beneficial for tinea pedis, although it does not seem to work as well as standard treatments.

Also studied for 30 conditions — evidence insufficient to rate
Insufficient Reliable Evidence To Rate Bacterial vaginosis
Rating & evidence shown verbatim from Natural Medicines

Although there is interest in using intravaginal tea tree oil for bacterial vaginosis, there is insufficient reliable information about the clinical effects of tea tree oil for this condition.

Insufficient Reliable Evidence To Rate Blepharitis
Rating & evidence shown verbatim from Natural Medicines

Topical tea tree oil has only been evaluated in combination with other ingredients; its effect when used alone is unclear.

Insufficient Reliable Evidence To Rate Cheilitis
Rating & evidence shown verbatim from Natural Medicines

Although there is interest in using topical tea tree oil for cheilitis, there is insufficient reliable information about the clinical effects of tea tree oil for this purpose.

Insufficient Reliable Evidence To Rate Contact dermatitis
Rating & evidence shown verbatim from Natural Medicines

Preliminary clinical research suggests that topical tea tree oil is beneficial for nickel-induced contact dermatitis.

Insufficient Reliable Evidence To Rate Dandruff
Rating & evidence shown verbatim from Natural Medicines

It is unclear if topical tea tree oil is beneficial for dandruff in adults and adolescents.

Insufficient Reliable Evidence To Rate Dental plaque
Rating & evidence shown verbatim from Natural Medicines

It is unclear if brushing or rinsing with tea tree oil is beneficial for dental plaque; the available evidence is conflicting.

Insufficient Reliable Evidence To Rate Dry eye
Rating & evidence shown verbatim from Natural Medicines

It is unclear if topical tea tree oil is beneficial for improving symptoms of dry eye due to cataract surgery or meibomian gland dysfunction.

Insufficient Reliable Evidence To Rate Furuncles (boils)
Rating & evidence shown verbatim from Natural Medicines

Although there is interest in using topical tea tree oil for boils, there is insufficient reliable information about the clinical effects of tea tree oil for this condition.

Insufficient Reliable Evidence To Rate Gingivitis
Rating & evidence shown verbatim from Natural Medicines

It is unclear if brushing or rinsing with tea tree oil is beneficial for gingivitis; the available evidence is conflicting.

Insufficient Reliable Evidence To Rate Halitosis
Rating & evidence shown verbatim from Natural Medicines

It is unclear if tea tree oil mouth rinses are beneficial for halitosis.

Insufficient Reliable Evidence To Rate Hemorrhoids
Rating & evidence shown verbatim from Natural Medicines

Topical tea tree oil has only been evaluated in combination with other ingredients; its effect when used alone is unclear.

Insufficient Reliable Evidence To Rate Herpes labialis (cold sores)
Rating & evidence shown verbatim from Natural Medicines

It is unclear if topical tea tree oil is beneficial for herpes labialis.

Insufficient Reliable Evidence To Rate Hirsutism
Rating & evidence shown verbatim from Natural Medicines

Topical tea tree oil has only been evaluated in combination with other ingredients; its effect when used alone is unclear.

Insufficient Reliable Evidence To Rate Insect bite
Rating & evidence shown verbatim from Natural Medicines

Although there is interest in using topical tea tree oil for insect bites, there is insufficient reliable information about the clinical effects of tea tree oil for this purpose.

Insufficient Reliable Evidence To Rate Lice
Rating & evidence shown verbatim from Natural Medicines

Topical tea tree oil has only been evaluated in combination with other ingredients; its effect when used alone is unclear.

Insufficient Reliable Evidence To Rate Methicillin-resistant Staphylococcus aureus (MRSA)
Rating & evidence shown verbatim from Natural Medicines

It is unclear if topical tea tree oil is beneficial for the prevention of MRSA colonization or the treatment of MRSA infection.

Insufficient Reliable Evidence To Rate Nipple Fissures
Rating & evidence shown verbatim from Natural Medicines

It is unclear if topical tea tree oil improves nipple-related complications of breastfeeding, such as nipple fissures and pain.

Insufficient Reliable Evidence To Rate Ocular demodicosis
Rating & evidence shown verbatim from Natural Medicines

It is unclear if topical tea tree oil is beneficial for ocular demodicosis; available evidence is conflicting.

Insufficient Reliable Evidence To Rate Oropharyngeal candidiasis
Rating & evidence shown verbatim from Natural Medicines

It is unclear if rinsing the mouth with tea tree oil is beneficial for the prevention of oropharyngeal candidiasis in various populations.

Insufficient Reliable Evidence To Rate Otitis externa
Rating & evidence shown verbatim from Natural Medicines

Although there is interest in using tea tree oil in the ear for otitis externa, there is insufficient reliable information about the clinical effects of tea tree oil for this condition.

Insufficient Reliable Evidence To Rate Otitis media
Rating & evidence shown verbatim from Natural Medicines

Although there is interest in using tea tree oil in the ear for otitis media, there is insufficient reliable information about the clinical effects of tea tree oil for this condition.

Insufficient Reliable Evidence To Rate Pharyngitis
Rating & evidence shown verbatim from Natural Medicines

Although there is interest in gargling with tea tree oil for pharyngitis, there is insufficient reliable information about the clinical effects of tea tree oil for this purpose.

Insufficient Reliable Evidence To Rate Rosacea
Rating & evidence shown verbatim from Natural Medicines

Topical tea tree oil has only been evaluated in combination with other ingredients; its effect when used alone is unclear.

Insufficient Reliable Evidence To Rate Scabies
Rating & evidence shown verbatim from Natural Medicines

Although there is interest in using topical tea tree oil for scabies, there is insufficient reliable information about the clinical effects of tea tree oil for this condition.

Insufficient Reliable Evidence To Rate Seborrheic dermatitis
Rating & evidence shown verbatim from Natural Medicines

Although there is interest in using topical tea tree oil for seborrheic dermatitis, there is insufficient reliable information about the clinical effects of tea tree oil for this condition.

Insufficient Reliable Evidence To Rate Tinea corporis
Rating & evidence shown verbatim from Natural Medicines

Although there is interest in using topical tea tree oil for tinea corporis, there is insufficient reliable information about the clinical effects of tea tree oil for this condition.

Insufficient Reliable Evidence To Rate Toothache
Rating & evidence shown verbatim from Natural Medicines

Although there is interest in rinsing the mouth with tea tree oil for toothache, there is insufficient reliable information about the clinical effects of tea tree oil for this purpose.

Insufficient Reliable Evidence To Rate Vaccine reaction
Rating & evidence shown verbatim from Natural Medicines

Topical tea tree oil has only been evaluated in combination with other ingredients; its effect when used alone is unclear.

Insufficient Reliable Evidence To Rate Water warts
Rating & evidence shown verbatim from Natural Medicines

It is unclear if topical tea tree oil is beneficial for water warts in children.

Insufficient Reliable Evidence To Rate Wound healing
Rating & evidence shown verbatim from Natural Medicines

Although there is interest in topical tea tree oil for wound healing, there is insufficient reliable information about the clinical effects of tea tree oil for this purpose.

Source & disclaimer. Effectiveness ratings and evidence summaries are provided by Natural Medicines (Therapeutic Research Center) and shown as licensed. Where Natural Medicines hasn’t rated a use, HelloPharmacist’s pharmacists may add their own reviewed rating and evidence (each such entry is labeled). This is educational information, not medical advice — talk with your pharmacist or doctor before starting, stopping, or changing a supplement.

Safety & precautions

Tea tree oil is for external use only. Swallowing it can cause serious poisoning, including confusion, loss of coordination, and other dangerous effects. Keep it well out of reach of children and pets.

Always dilute the oil with a carrier oil (such as coconut or olive oil) before applying it, and do a small patch test on your skin first to check for a reaction. Avoid getting it in the eyes, inside the nose, or on broken or very sensitive skin.

Because there is little safety data, pregnant and breastfeeding people should be cautious—avoid swallowing it entirely, limit topical use, keep it away from the breast and nipple area, and talk with a doctor or pharmacist first.

Side effects

The most common side effects are skin-related: redness, itching, burning, dryness, or a rash where the oil is applied. Using it undiluted makes irritation more likely.

Some people develop an allergic skin reaction (contact dermatitis), which can get worse with repeated use. Older or oxidized oil may be more irritating. There have also been reports linking topical tea tree oil products to temporary breast tissue growth in young boys, though this is not fully understood. Stop use and seek care if you notice swelling, a severe rash, or trouble breathing.

Tea Tree Oil: Reported Adverse Effects

Documented safety reports on Tea Tree Oil from the evidence-graded Natural Medicines (TRC Healthcare) database, shown word-for-word from the licensed record.

Orally, tea tree oil can cause significant toxicity and should not be used. Topically, tea tree oil is generally well tolerated.

Most Common Adverse Effects:

Topically: Allergic reactions, burning, dryness, irritation, pruritus, redness, and stinging.

Reports by condition
Acne Dermatologic

Ingestion of as little as 2.5 mL of tea tree oil can cause petechial body rash. It can take up to a week for symptoms to resolve.

Topically, tea tree oil is usually well tolerated. However, it can cause local irritation and inflammation in some patients. Treatment with topical corticosteroids may be needed in some cases. Severe allergic contact dermatitis has also been reported. Tea tree oil can cause skin dryness, and less frequently pruritus, stinging, burning, and redness in patients with acne. It may also cause mild oral mucosal burning.

  1. Elliott C. Tea tree oil poisoning. Med J Aust 1993;159:830-1.
  2. Satchell AC, Saurajen A, Bell C, Barnetson RS. Treatment of interdigital tinea pedis with 25% and 50% tea tree oil solution: a randomized, placebo-controlled, blinded study. Australas J Dermatol 2002;43:175-8..
  3. Martin KW, Ernst E. Herbal medicines for treatment of fungal infections: a systematic review of controlled clinical trials. Mycoses 2004;47:87-92.
  4. Enshaieh S, Jooya A, Siadat AH, and Iraji F. The efficacy of 5% topical tea tree oil gel in mild to moderate acne vulgaris: a randomized, double-blind placebo-controlled study. Indian J Dermatol Venereol Leprol 2007;73(1):22-25.
  5. Christoffers WA, Blömeke B, Coenraads PJ, Schuttelaar ML. Co-sensitization to ascaridole and tea tree oil. Contact Dermatitis. 2013 Sep;69(3):187-9.
  6. Corazza M, Borghi A, Gallo R, Schena D, Pigatto P, Lauriola MM, Guarneri F, Stingeni L, Vincenzi C, Foti C, Virgili A. Topical botanically derived products: use, skin reactions, and usefulness of patch tests. A multicentre Italian study. Contact Dermatiti
  7. Navarro-Triviño FJ, Prados-Carmona Á, Ruiz-Villaverde R. Systemic allergic contact dermatitis caused by tea tree oil in a cream for treatment of molluscum contagiosum. Contact Dermatitis 2022;87(3):285-287.
  8. Bekhof AMW, van Hunsel FPAM, van de Koppel S, Woerdenbag HJ. Safety assessment and adverse drug reaction reporting of tea tree oil (Melaleuca aetheroleum). Phytother Res 2022.
  9. Ambrogio F, Foti C, Cazzato G, et al. Spreading Allergic Contact Dermatitis to Tea Tree Oil in an Over-the-Counter Product Applied on a Wart. Medicina (Kaunas) 2022;58(5):561.
  10. Samaran Q, Litovsky J, Girod M, Dereure O, Raison-Peyron N. Allergic Contact Dermatitis to Tea Tree Oil With No Sensitization to Fragrance Markers. Dermatitis 2023.
  11. Bassett IB, Pannowitz DL, Barnetson RS. A comparative study of tea-tree oil versus benzoylperoxide in the treatment of acne. Med J Aust 1990;153:455-8.
  12. Kwon HH, Yoon JY, Park SY, Min S, Suh DH. Comparison of clinical and histological effects between lactobacillus-fermented Chamaecyparis obtusa and tea tree oil for the treatment of acne: an eight-week double-blind randomized controlled split-face study. D
  13. Jandourek A, Vaishampayan JK, Vazquez JA. Efficacy of melaleuca oral solution for the treatment of fluconazole refractory oral candidiasis in AIDS patients. AIDS 1998;12:1033-7.
Depression Neurologic/CNS
Dermatitis Immunologic

Orally, tea tree oil can cause or worsen systemic contact dermatitis. Topically, tea tree oil is usually well tolerated. However, it can cause allergic contact eczema and allergic contact dermatitis in some children and adults. Corticosteroids may be needed in some cases.

In young children, ingestion of 10 mL or less of tea tree oil can cause significant ataxia, drowsiness, disorientation, and coma.

  1. Carson CF, Riley TV, Cookson BD. Efficacy and safety of tea tree oil as a topical antimicrobial agent. J Hosp Infect 1998;40:175-8.
  2. De Groot A. C. and Weyland J. W. Systemic contact dermatitis from tea tree oil. Contact Dermatitis 1992;27(4):279-280.
  3. De Groot AC. Airborn allergic contact dermatitis from tea tree oil. Contact Dermatitis 1996;35:304-5.
  4. Rubel DM, Freeman S, Southwell IA. Tea tree oil allergy: what is the offending agent? Report of three cases of tea tree oil allergy and review of the literature. Australas J Dermatol 1998;39:244-7.
  5. Bhushan M, Beck MH. Allergic contact dermatitis from tea tree oil in a wart paint. Contact Dermatitis 1997;36:117-8.
  6. Knight TE, Hausen BM. Melaleuca oil (tea tree oil) dermatitis. J Am Acad Dermatol 1994;30:423-7..
  7. Bruynzeel DP. Contact dermatitis due to tea tree oil. Trop Med Int Health 1999;4:630.
  8. Greig JE, Thoo SL, Carson CF, Riley TV. Allergic contact dermatitis following use of a tea tree oil hand-wash not due to tea tree oil. Contact Dermatitis 1999;41:354-5.
  9. Varma S, Blackford S, Statham BN, Blackwell A. Combined contact allergy to tea tree oil and lavender oil complicating chronic vulvovaginitis. Contact Dermatitis 2000;42:309-10.
  10. Khanna M, Qasem K, Sasseville D. Allergic contact dermatitis to tea tree oil with erythema multiforme-like id reaction. Am J Contact Dermat 2000;11:238-42..
  11. Corazza M, Borghi A, Gallo R, Schena D, Pigatto P, Lauriola MM, Guarneri F, Stingeni L, Vincenzi C, Foti C, Virgili A. Topical botanically derived products: use, skin reactions, and usefulness of patch tests. A multicentre Italian study. Contact Dermatiti
  12. Martínez Campayo N, Goday Buján JJ, Fonseca Capdevila E. Allergic contact dermatitis due to tea tree oil. Actas Dermosifiliogr (Engl Ed). 2020;111(9):787-788.
  13. Lauriola MM, Sena P, De Bitonto A, Corazza M. Allergic contact dermatitis due to "therapeutic uses" of tea tree oil on the lips and toenails. Dermatitis. 2021;32(3):e40-e41.
  14. Bekhof AMW, van Hunsel FPAM, van de Koppel S, Woerdenbag HJ. Safety assessment and adverse drug reaction reporting of tea tree oil (Melaleuca aetheroleum). Phytother Res 2022.
  15. Ambrogio F, Foti C, Cazzato G, et al. Spreading Allergic Contact Dermatitis to Tea Tree Oil in an Over-the-Counter Product Applied on a Wart. Medicina (Kaunas) 2022;58(5):561.
  16. Samaran Q, Litovsky J, Girod M, Dereure O, Raison-Peyron N. Allergic Contact Dermatitis to Tea Tree Oil With No Sensitization to Fragrance Markers. Dermatitis 2023.
  17. Del Beccaro MA. Melaleuca oil poisoning in a 17-month-old. Vet Hum Toxicol 1995;37:557-8.
  18. Jacobs MR, Hornfeldt CS. Melaleuca oil poisoning. J Toxicol Clin Toxicol 1994;32:461-4..
  19. Morris MC, Donoghue A, Markowitz JA, Osterhoudt KC. Ingestion of tea tree oil (Melaleuca oil) by a 4-year-old boy. Pediatr Emerg Care 2003;19:169-71.
Drug-induced hearing loss Ocular/Otic

There is some concern that topical use of tea tree oil in the middle ear for treatment of ear infections might cause ototoxicity. There is preliminary evidence from animal research that preparations of pure tea tree oil can cause ototoxicity and impaired hearing. However, so far there are no reports of ototoxicity in humans. Until more is known, tell patients to avoid pure or highly concentrated tea tree oil preparations. Concentrations of 2% seem less likely to have this effect.

  1. Zhang SY, Robertson D. A study of tea tree oil ototoxicity. Audiol Neurootol 2000;5:64-8.
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.

Adverse-effects data: Natural Medicines, Therapeutic Research Center

Dosing

There is no official standardized dose for tea tree oil. Many skin products contain it at low concentrations, often diluted to a small percentage of the total product.

The safest approach is to follow the directions on the product label and not apply more or more often than directed. If you are using pure essential oil, dilute it with a carrier oil before use. When in doubt about strength or how to use it, ask your pharmacist or doctor. Never take it by mouth.

Pregnancy & Breastfeeding

Tea Tree Oil & Pregnancy

Possibly Safe

When used topically and appropriately.

  1. Robbers JE, Tyler VE. Tyler's Herbs of Choice: The Therapeutic Use of Phytomedicinals. New York, NY: The Haworth Herbal Press, 1999.
Likely Unsafe

When used orally. Ingestion of tea tree oil can be toxic.

  1. Foster S, Tyler VE. Tyler's Honest Herbal, 4th ed., Binghamton, NY: Haworth Herbal Press, 1999.

Tea Tree Oil & Breastfeeding

Possibly Safe

When used topically and appropriately.

  1. Robbers JE, Tyler VE. Tyler's Herbs of Choice: The Therapeutic Use of Phytomedicinals. New York, NY: The Haworth Herbal Press, 1999.
Likely Unsafe

When used orally. Ingestion of tea tree oil can be toxic.

  1. Foster S, Tyler VE. Tyler's Honest Herbal, 4th ed., Binghamton, NY: Haworth Herbal Press, 1999.
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

Pregnancy & lactation ratings: Natural Medicines, Therapeutic Research Center

References & further reading

The 31 references that drive our Tea Tree Oil 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. Robbers JE, Tyler VE. Tyler's Herbs of Choice: The Therapeutic Use of Phytomedicinals. New York, NY: The Haworth Herbal Press, 1999.
  2. Foster S, Tyler VE. Tyler's Honest Herbal, 4th ed., Binghamton, NY: Haworth Herbal Press, 1999. DOI
  3. De Groot AC. Airborn allergic contact dermatitis from tea tree oil. Contact Dermatitis 1996;35:304-5.
  4. Rubel DM, Freeman S, Southwell IA. Tea tree oil allergy: what is the offending agent? Report of three cases of tea tree oil allergy and review of the literature. Australas J Dermatol 1998;39:244-7. PubMed
  5. Carson CF, Riley TV, Cookson BD. Efficacy and safety of tea tree oil as a topical antimicrobial agent. J Hosp Infect 1998;40:175-8. PubMed
  6. Bhushan M, Beck MH. Allergic contact dermatitis from tea tree oil in a wart paint. Contact Dermatitis 1997;36:117-8. PubMed
  7. Del Beccaro MA. Melaleuca oil poisoning in a 17-month-old. Vet Hum Toxicol 1995;37:557-8.
  8. Jandourek A, Vaishampayan JK, Vazquez JA. Efficacy of melaleuca oral solution for the treatment of fluconazole refractory oral candidiasis in AIDS patients. AIDS 1998;12:1033-7. DOI
  9. Zhang SY, Robertson D. A study of tea tree oil ototoxicity. Audiol Neurootol 2000;5:64-8. PubMed
  10. Bassett IB, Pannowitz DL, Barnetson RS. A comparative study of tea-tree oil versus benzoylperoxide in the treatment of acne. Med J Aust 1990;153:455-8. PubMed
  11. Jacobs MR, Hornfeldt CS. Melaleuca oil poisoning. J Toxicol Clin Toxicol 1994;32:461-4.. PubMed
  12. Elliott C. Tea tree oil poisoning. Med J Aust 1993;159:830-1. PubMed
  13. Knight TE, Hausen BM. Melaleuca oil (tea tree oil) dermatitis. J Am Acad Dermatol 1994;30:423-7.. PubMed
  14. Bruynzeel DP. Contact dermatitis due to tea tree oil. Trop Med Int Health 1999;4:630.
  15. Greig JE, Thoo SL, Carson CF, Riley TV. Allergic contact dermatitis following use of a tea tree oil hand-wash not due to tea tree oil. Contact Dermatitis 1999;41:354-5. PubMed
Keep reading

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.

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

Pharmacist Counseling Corner

Tea Tree Oil: Common Questions

What is Tea Tree Oil used for, and does it work?
People use Tea Tree Oil for many reasons, but the evidence varies by use. According to the Natural Medicines database, there is at least some clinical evidence supporting Tea Tree Oil for Acne, Onychomycosis and Tinea pedis. For most other uses it has been studied for, the evidence is currently insufficient to rate. See the graded list on this page, and always confirm with your pharmacist or doctor.
Does Tea Tree Oil interact with prescription medications?
We do not currently list any known drug interactions for Tea Tree Oil. This does not guarantee that none exist, so always confirm with your pharmacist before combining it with your medications.
How are Tea Tree Oil interactions rated?
Each interaction is graded major, moderate, or minor based on how clinically significant it is and the strength of the evidence behind it. Major interactions are the most serious and are best avoided, or used only under close professional supervision.
Is it safe to take Tea Tree Oil with my medications?
It depends on the specific medication. Some combinations are fine, while others call for monitoring, timing changes, or should be avoided. Check your exact drug above and confirm with your pharmacist or doctor before starting, stopping, or changing anything.
Where does this Tea Tree Oil interaction information come from?
Our interaction data is built on the Natural Medicines database — an evidence-graded reference for vitamins, herbs, and supplements — and is reviewed by licensed HelloPharmacist pharmacists, who may add clinical context.
What is Tea Tree Oil mainly used for?
It is most often applied to the skin for acne, fungal infections such as athlete's foot, dandruff, and minor cuts or insect bites. The evidence is supportive but limited for most uses.
Can I swallow Tea Tree Oil?
No. Tea Tree Oil is toxic if taken by mouth and can cause serious symptoms like confusion and loss of coordination. It should only be used on the skin.
Do I need to dilute Tea Tree Oil before using it?
Yes, in most cases. Diluting it with a carrier oil lowers the risk of skin irritation, and you should always do a small patch test first.
Is Tea Tree Oil safe during pregnancy or breastfeeding?
Safety data is limited, so be cautious. Avoid swallowing it, limit topical use, keep it away from the breast area, and check with your doctor or pharmacist first.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

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