What is the dose ratio of Gui Zhi and Bai Shao in Gui Zhi Tang?

• A. 1:1 Ratio, 9:9g
• B. 2:1 Ratio, 9:4.5g
• C. 1:2 Ratio, 9:18g
• D. 1:1 Ratio, 6:6g

Answer: (A)

The key idea is balancing exterior release with yin nourishment. In Gui Zhi Tang, Gui Zhi and Bai Shao are used in equal amounts to harmonize the surface aspect (releasing wind-cold) with the internal yin aspect (preserving fluids). Gui Zhi helps unlock the exterior and promote sweating, while Bai Shao nourishes the liver-blood and restrains excessive sweating, preventing yin deficiency from developing as the pathogen is expelled. When both herbs are equal, the formula can unfold the pathogen from the surface without draining the body's fluids, producing the characteristic pattern of wind-cold with mild deficiency signs. If Gui Zhi is relatively higher, the response can become too activating, leading to more sweating and possible dryness; if Bai Shao is relatively higher, the exterior release may be insufficient and symptoms linger. The classical preparation uses equal amounts of the two herbs to achieve this balance.