This is a simple formula with a clear-cut single action: clearing Heat Toxin (or Fire Toxin). Clinically this formula may be used alone, or as a base for more complex formulations. In regards to pathogenesis, these conditions may arise due to external contraction or from internally generated Heat due to overindulgence in heating foods. This formula is mainly applied in acute conditions, in which the health Qi (zheng qi) is robust, i.e. purely excess type syndromes.