Balloonflower Root (Ku Jie Geng)

Traditional Use

Primary Actions

• Opens and disseminates Lung Qi while transforming phlegm - used for cough, wheezing, chest oppression, and stubborn sputum when phlegm blocks the Lung's normal diffusion and descent in either wind-cold or wind-heat presentations.
• Benefits the throat and restores the voice - classically used for sore throat, hoarseness, painful swallowing, and loss of voice when the Lung channel is constrained by phlegm, wind-heat, or toxic swelling.
• Expels pus from the Lung and throat - an important herb for Lung abscess, throat suppuration, and foul purulent sputum because it opens the upper burner and promotes outward drainage rather than internal entrapment.
• Guides other herbs upward to the chest and throat - frequently added to formulas as an envoy herb so companion medicinals reach the Lung, pharynx, and upper burner more effectively.

Secondary Actions

• Helps coordinate the upward and downward movement of Lung Qi when paired with descending herbs such as Xing Ren or Zhi Ke, making it useful in formulas that must both ventilate and descend.
• As a synonym-grade market name rather than a distinct species, Ku Jie Geng is best understood as the same platycodon root drug used under a more specific trade label.

Classic Formulas

• Jie Geng Tang (桔梗汤) - recorded in Shang Han Lun and Jin Gui Yao Lue as the classic two-herb pairing of Jie Geng with Gan Cao for throat pain, swelling, cough, and upper-burner obstruction.
• Zhi Sou San (止嗽散) - from Yi Xue Xin Wu, where Jie Geng helps open Lung Qi and stop lingering cough with persistent phlegm after an external pathogen has not fully resolved.
• Yin Qiao San (银翘散) - from Wen Bing Tiao Bian, using Jie Geng to ventilate the Lung and benefit the throat in early wind-heat disease with fever and painful sore throat.

Classical References

• SYNONYM NOTE: Me & Qi and Sacred Lotus list Ku Jie Geng (苦桔梗) as an alternate name for the standard drug Jie Geng rather than a separate crude herb. This import-variant record is retained because the XLSX source filed the synonym as a distinct entry, but its therapeutic identity is shared with herb #119 (balloonflower-root).
• Shen Nong Ben Cao Jing and later materia medica traditions consistently describe Jie Geng as treating cough with rebellious Qi, throat obstruction, chest fullness, and suppurative disorders of the Lung.
• Classical physicians described Jie Geng as a 'boat herb' that carries medicinals upward to the chest and throat, which explains its repeated use as an envoy in upper-burner formulas even when it is not the chief ingredient.