Tonifying method in Shang Han Lun

Tonifying method is one of the eight therapeutic methods introduced in Shang Han Lun (Treatise on Cold Damage伤寒论) written by Zhang Ji (Zhang Zhongjing) in the Eastern Han Dynasty (3th century). This method functions in invigorating qi, blood, yin and yang, and it is used for various deficiency syndromes. In this article, two representative formulae will be introduced: Xiao Jian Zhong Tang (Minor Centre-Fortifying Decoction小建中汤) and Zhigancao Tang (Prepared Licorice Decoction炙甘草汤).