Tripterygium wilfordii, or lei gong teng (Chin. 雷公藤), sometimes called Thunder God Vine, is a vine used in traditional Chinese medicine for treatment of fever, chills, edema and carbuncle. Tripterygium wilfordii recently has been investigated as a treatment for a variety of disorders including rheumatoid arthritis, chronic hepatitis, chronic nephritis, ankylosing spondylitis, as well as several skin disorders. It is also under investigation for its apparent antifertility effects, which it is speculated, may provide a basis for a Male oral contraceptive.