Qian Hu Root Classic Formulas … Natural Herb Library

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Redirects Lung qi downward and transforms phlegm ... Qian Hu is a classic cough root for productive cough, chest congestion, and thick sputum that needs movement rather than simple moistening.
Releases the exterior and vents wind-heat ... it is used when cough overlaps with early exterior invasion, slight fever, or body discomfort.
Opens the chest and eases constrained respiratory fullness ... especially when cough, phlegm, and poor qi descent occur together.

Xing Su San ... classic cool-dry or wind-cold cough formula where Qian Hu helps descend Lung qi and move phlegm.
Jin Fei Cao San ... traditional cough formula using Qian Hu when exterior influence and sputum are both present.
Qian Hu San type productive-cough formulas ... standard pairing logic with Jie Geng, Sang Bai Pi, and other Lung-qi herbs.

Materia medica consistently places Qian Hu in the Lung as a descending herb for cough with phlegm and early exterior involvement.
Authentication matters because current taxonomy has shifted while older trade and research language often still says Peucedanum praeruptorum.