Rhus tox is short for Rhus toxicodendron, better known as a North American species of plant called poison ivy. For most people, the leaves are poisonous if touched, though some people are immune to the effects. Rhus tox is a homeopathic method that uses dilutions or potencies of the oil to treat various ailments, such as stiffness, arthritis, and tendinitis.

Homeopathic remedies typically use the ingredients that caused the initial reaction in extremely diluted form, so much so that no molecule of the original substance can be detected. In this form, the homeopathic medicine can possibly cure conditions that the original substance would have caused.

Since poison ivy can cause stiffness, homeopathic Rhus tox traditionally is used to relieve stiffness of various types, including physical, mental, and emotional. Many people find it useful for rheumatism and arthritis, and it has also been said to be good for tendinitis. Some people claim that it works well together with arnica montana, which is another homeopathic remedy that is used for a variety of aches and pains.

Rhus tox can be taken in a variety of different ways and in different potencies. Some people are susceptible to it, and only one homeopathic pill will cure their condition. For others, the remedy needs to be taken for a longer period, perhaps three times a day. Some people carry it in a packet or handbag, and take a pill whenever they feel the need, particularly for chronic conditions such as arthritis. As with all homeopathic remedies, no harm usually occurs if too much is taken since there essentially is no trace of the original poison ivy left in the diluted remedy.

Homeopathic remedies are also said to be useful for particular types of people or states of mind. Rhus tox is thought to be particularly beneficial for those people who are to some extent inflexible in both mind and body. It also is thought to be effective when used to cure dizziness, depressive feelings, high body temperatures, eczema, burns and itches, sensitive scalp, stiff and painful muscles, and menstrual difficulties. These may appear to be unrelated symptoms, but some people claim that they have been cured or their symptoms have subsided after using Rhus tox.

In most countries, Rhus tox can easily be obtained at any large retail pharmacy which stocks homeopathic medicines. Different potencies usually are available, typically 6C and 30C doses. Stronger versions can be bought from specialist homeopathic pharmacies, but are usually better taken under the guidance of a qualified homeopath.