Classical and Modern Chinese Herbal Formulations
Composition logic
Formulas are tested as systems. Know the roles of chief (jun), deputy (chen), assistant (zuo), and envoy (shi); how proportions create direction; and how classical formulas are modified for patterns. Study source texts, ingredient lists, preparation methods, and typical indications. Patent medicines raise different issues: labeled ingredients may differ from classical formulas, and fillers, binders, and concentration vary.
Traps
Name confusion is common: similar pinyin, similar English, or the same formula under different sources. Do not assume a famous formula is appropriate for every patient with the named pattern. Watch for substitutions, omitted ingredients, and changed ratios; a small change can shift the formula's temperature or direction. Questions may ask which herb is chief-read the whole formula, not the first ingredient.
Worked example
Gui Zhi Tang and Ma Huang Tang both release the exterior and contain Gui Zhi. Gui Zhi Tang includes white peony, ginger, jujube, and honey-fried licorice; it harmonizes ying-wei for sweating with aversion to wind. Ma Huang Tang adds Xing Ren and uses Ma Huang as chief for wind-cold with no sweating and wheezing. Rule of thumb: identify the chief herb and the presence or absence of sweating before choosing a release formula.