The formula presentation is a theoretical model of herbal formula application that lies between the herbs and formulas on one hand, and the disease pattern on the other. It is the arrow aiming for the target in relation to disease treatment. The formula presentation is the guiding principle behind how a formula is selected. ‘Zheng’(证) refers to evidence, proof, results or efficacy (证验), and also symptoms (症状). Therefore, when all these definitions are taken together, the formula presentation refers to a formula’s key presentation, or instance where a formula displays its main efficacy or results.
Currently in China, many consider the earliest recording of this concept to be found in the Wu Shi Er Bing Fang (五十二病方, Prescriptions for Fifty-Two Diseases), yet many scholars believe that it wasn’t until Zhang Zhongjing’s (张仲景) writings that the concept really took hold, only to be further developed by later generations of physicians. The idea of a formula correspondence (方证相应) is seen in the postscript for line 317 of the Shang Han Lun (伤寒论, Treatise on Cold Damage) which states:
[Only when] the disease corresponds to the formula [can the formula] be taken.
This line offers the most succinct explanation and definition of a formula presentation and implies that all diseases have a corresponding formula, a ‘formula presentation.’ The Shang Han Lun also refers to specific ‘herb presentations’ (药证) such as a ‘Chai Hu (Bupleuri Radix) presentation’ (柴胡证), or a ‘Gui Zhi (Cinnamomi Ramulus) presentation’ (桂枝证). In addition, line 16 of the Shang Han Lun states:
Observe the pulse and signs, know what error [you] have committed, [and then] treat according to the signs.
The Shang Han Za Bing Lun (伤寒杂病论, Treatise on Cold Damage and Miscellaneous Diseases) was arguably the first text to suggest not just the concept of a formula presentation, but also the principle that became known as ‘determining treatment by patterns identified’ (辨证论治), which lays importance on not just simply knowing which formula treats specific signs, but also on having a clear understanding of the underlying pathomechanism involved. Once the pattern is clearly understood, the choice of the correct formula can be made. According to Professor Huang Huang (黄煌教授), once a formula presentation is clearly identified, not only will the formula be safe to use, but the treatment will also be effective. Following Zhang Zhongjing, physicians such as Sun Simiao (孙思邈), Zhu Gong (朱肱), Xu Lingtai (徐灵胎), Ke Qin (柯琴) and Yu Jiayan (喻嘉言) were highly influential in the ‘school of formula types’ (方类证派), adhering to the concept of ‘formula presentations with similar clauses’ (方证同条). Song dynasty Zhu Gong referred to a formula presentation simply as a ‘herb presentation.’ The Japanese physician Todo Yoshimasu (吉益东洞) was a strict adherent to the model laid out by Zhang Zhongjing, and was a major contributor to the Japanese Classical Formula School (日本古方派). Although many of these physicians adhered to the formula presentation model, there are some differences in their overall approach and in the method with which they arrived at the presentation. For example, Ke Qin wrote: “Patterns are differentiated from the conformations, therefore the pattern is named after the formula” (证从经分，以方名证), referring to the six conformations (六经), while Xu Lingtai wrote: “In order to [determine] the formula presentation type, [one must] not differentiate according to the conformations” (以方类证，方不分经). While both used the formula presentation model as their method to choose a formula, Ke Qin recorded signs and symptoms exactly as they appear in the Shang Han Lun’s six conformations, while Xu Lingtai worked with general signs and symptoms. Essentially, a formula presentation is experience: the experienced usage of herbs and formulas over thousands of years.