This formula was first recorded by Wu Kun, 1584. It is a formula that has traditionally been directed towards Phlegm and Heat.
Phlegm-Heat may develop as a consequence of invasion by exogenous Wind-Heat or Wind-Cold (which transforms into Heat). As such it is often seen as an acute disorder – with or without the concomitant clinical manifestations of an Exterior syndrome. Because the pathogens may obstruct the Lung Qi, fluids may stagnate and are readily transformed into Phlegm under the influence of Heat. Alternatively, Phlegm-Heat may develop in patients with chronic Phlegm-Damp obstruction. In these cases, the underlying cause is deficiency of the Spleen Qi with impaired fluid metabolism, which leads to the development of Phlegm.