Clearing method in Shang Han Lun.

Clearing method is one of the eight therapeutic methods introduced in Shang Han Lun (Treatise on Cold Damage)by Zhang Zhong-Jing in the Eastern Han Dynasty (3rd Century). This method is mainly used for the treatment of interior heat syndrome of Yangming Meridian Diseases during febrile disease, and Baihu Tang is usually regarded as a representative formula. Additionally, there are other prescriptions in Shang Han Lun, which should also be classified in the category of clearing method. These formulae will be discussed in this article.