Herb Formulas Notebook

Da Yuan Yin

(Reach the Source Drink)

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Source: Discussion of Warm Epidemics (1642)
Author: Wu You-Xing / You-Ke

Category: Formulas that Harmonise

Pattern: Foul turbidity lodged in the Membrane Source (Mo Yuan)

Key Symptoms: Alternating fever and chills (both strong) at regular intervals 1-3 times per day, a stifling sensation in the chest, nausea or vomiting, headache, irritability, scanty turbid yellow urine

Tongue: Deep red edges with a thick, foul, pasty coating
Pulse: Wiry and rapid and neither floating nor submerged

Cao Guo 1.5g
Hou Po 3g
Bing Lang 6g
Huang Qin 3g
Zhi Mu 3g
Bai Shao 3g
Gan Cao 1.5g

In the UK Bing Lang must be substituted. Zhi Shi and either Yu Li Ren or Fei Zi for parasites are the standard substitutions. Alternatively if being used for malarial disorders as many discussions of the Membrane Source imply then Qing Hao may be suitable although the fresh herb is really needed if the antimalarial component Artemisinin is wanted.

Preparation: Decoction.

Actions: Opens the Membrane Source (Mo Yuan) by thrusting out pathogens, clears away filth, transforms turbidity

Contraindications: Unsuitable for Damp-Warm disorders where Heat is stronger than Dampness, or for Lurking Heat and Constrained Dampness. It must also be stopped once the Qi dynamic has been opened and the pathogen discharged.

Once the Qi dynamic has been restored and the pathogen has been discharged it will usually transmute into a Heat pattern as the constrained Yang Qi will now forcefully move to the Exterior. Repeated and inappropriate use of this formula is said to cause Ministerial Fire to flare upward, stirring Liver Wind and causing spams and convulsions.

The Membrane Source (Mo Yuan) is a concept whose exact definition has changed over time but which generally seems to relate the membranes surrounding the vital organs and especially the diaphragm. As such it associated with the San Jiao and with Shaoyang as half interior, half exterior.

Research Links:
Science Direct
Google Scholar
Journal of Chinese Medicine

Reference Notes: (click to display)

These pages are intended to assist clinicians and are not intended for self-diagnosis or treatment for which a qualified professional should be consulted.