Thuja occidentalis

What is Thuja occidentalis?

Thuja occidentalis is a homeopathic medicine prepared from the Northern White Cedar or Arborvitae, Thuja occidentalis (Cupressaceae). It is an evergreen coniferous tree native to Eastern Canada and the Northeastern United States.

Homeopathic medicines containing Thuja occidentalis have been used for centuries by people suffering from symptoms associated with scurvy, psoriasis, and bronchitis. Its essential oil has also been used in cleansers, insecticides, and soaps.

The process of preparing the homeopathic medicine Thuja occidentalis involves significantly diluting its plant-based raw material, the Northern White Cedar. Click here to learn more about the dilution process and why homeopathic medicines should not be confused with their raw materials.

What is homeopathic Thuja occidentalis typically used to treat?

  • Common and plantar warts
  • Eye irritation
  • Mental lethargy, drowsiness, and irritability
Common brands containing Thuja occidentalis:
  • Boiron®
  • Hyland’s®
  • Similasan®

How much homeopathic Thuja occidentalis can you take?

Homeopathic medicines containing this active ingredient have different purposes, dilutions, and directions. That is why it is always important to read and follow the Drug Facts label. The Warnings section indicates the maximum number of days you should use the product. If symptoms persist or worsen, stop use and ask a doctor.

Safety guide for Thuja occidentalis

Most over-the-counter (OTC) homeopathic ingredients are dilutions of the raw material. The level of dilution is identified on a homeopathic medicine’s Drug Facts label. The Homeopathic Pharmacopoeia of the United States (HPUS) established that OTC homeopathic medicines containing 2X and higher dilutions of Thuja occidentalis are safe for adults and children.

Therapeutic claims for Thuja occidentalis are based on traditional homeopathic practice, not accepted medical evidence. Homeopathic products are not evaluated by the U.S. Food and Drug Administration (FDA).

Ask a healthcare provider before use if:

  • You are pregnant or breastfeeding.

Do not use if:

  • Do not use more than the Drug Facts label indicates unless instructed by a healthcare provider.

Stop use and ask a doctor if:

  • Your condition gets worse or if symptoms persist for more than the duration displayed on the Drug Fact label, usually 3 to 7 days.
  • Your symptoms clear up and return within a few days.
  • You have an unexpected reaction. Get medical help right away.
  • You develop new symptoms.
  • You take too much. Immediately contact a healthcare provider or the Poison Control national helpline at 800.222.1222.


The Homoeopathic Pharmacopoeia of the United States (HPUS) is the official guidebook that outlines standards of identity and purity that homeopathic medicines must meet.

Materia Medica (or “materials of medicine”) contains information about the specific symptoms of disease and the homeopathic medicines used for their treatment.