What is rhus toxicodendron 4x hpus?

Rhus toxicodendron 4x HPUS is a homeopathic dilution prepared from the fresh leaves of the poison ivy plant, Toxicodendron radicans. The "4x" designation indicates that the original substance has been diluted four times in a 1 to 10 ratio, resulting in a final concentration of 1 part rhus toxicodendron to 10,000 parts diluent. The "HPUS" abbreviation stands for Homeopathic Pharmacopeia of the United States, indicating that the product meets the standards and guidelines set by the Homeopathic Pharmacopoeia Convention of the United States (HPCUS).