What Is Eucalyptus and How Does It Work?

Eucalyptus is a tree that is native to Australia. Eucalpytus oil is extracted from the leaves of the tree. Eucalyptus oil is available as an essential oil that is used as a medicine to treat a variety of common diseases and conditions including nasal congestion, asthma, and as a tick repellant. Diluted eucalyptus oil may also be applied to the skin as a remedy for health problems such as arthritis and skin ulcers. Eucalyptus oil is also used to ease cold symptoms and provide respiratory health benefits. Eucalyptol, which is often used in mouthwashes and cold remedies, is derived from Eucalyptus globulus. Eucalyptus is often used as an essential oil with a diffuser for aromatherapy health benefits.

  • Eucalyptus is available under the following different brand and other names: fevertree, gum tree, red ironbark, and white ironbark.

What Are Dosages of Eucalyptus Oil?

Dosages of Eucalyptus Oil
  • Available as an oil.

Note: Eucalyptus oil must be diluted and should not be ingested at its full strength.

Dosage Considerations – Should be Given as Follows:
  • Arthritis: 5-20% in an oil-based formulation or 5-10% in an alcohol-based formulation
  • Nasal Congestion: 1 teaspoon in boiling water for steam inhalation; also rub on chest and around the nose

What Are Side Effects Associated with Using Eucalyptus?

Common side effects of eucalyptus include:

  • allergic reactions
  • Severe allergic reactions if oil is taken orally, including:

This document does not contain all possible side effects and others may occur. Check with your physician for additional information about side effects.

What Other Drugs Interact with Eucalyptus?

If your doctor has directed you to use this medication for diabetes, your doctor or pharmacist may already be aware of any possible drug interactions and may be monitoring you for them. Do not start, stop, or change the dosage of any medicine before checking with your doctor, health care provider, or pharmacist first.

  • Severe Interactions of Eucalyptus include:
    • none
  • Serious Interactions of eucalyptus include:
  • Eucalyptus has moderate interactions with at least 100 different drugs.
  • Eucalyptus has mild interactions with at least 301 different drugs.

This document does not contain all possible interactions. Therefore, before using this product, tell your doctor or pharmacist of all the products you use. Keep a list of all your medications with you, and share the list with your doctor and pharmacist. Check with your physician if you have health questions or concerns.

What Are Warnings and Precautions for Eucalyptus?


  • This medication contains eucalyptus. Do not take fevertree, gum tree, red ironbark, or white ironbark if you are allergic to eucalyptus or any ingredients contained in this drug.
  • Keep out of reach of children. In case of overdose, get medical help or contact a Poison Control Center immediately.


Effects of Drug Abuse

  • No information was provided.

Short-Term Effects

  • See "What Are Side Effects Associated with Using Eucalyptus?"

Long-Term Effects

  • See "What Are Side Effects Associated with Using Eucalyptus?"


  • Do NOT ingest oil - severe, potentially fatal toxicity
  • Diabetes, hypoglycemia

Pregnancy and Lactation

  • Avoid the use of eucalyptus during pregnancy or while breastfeeding
Medscape. Eucalyptus.

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