Chinese Gall Classic Formulas — Natural Herb Library

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Astringes the Lungs and stops chronic cough - Wu Bei Zi is used after the acute pathogen has passed, when lingering deficiency or residual heat leaves the Lungs unable to contain Qi and fluids, causing persistent cough, sweating, or weak breath.
Binds the intestines and stops chronic diarrhea or dysentery - its powerful astringent action is classically chosen for prolonged loose stools, lingering dysentery, and even rectal prolapse when the bowels have lost their holding function.
Restrains sweating and secures essence - by tightening leakage, Wu Bei Zi is used for spontaneous sweating, night sweats, involuntary seminal emission, and other disorders of fluids or essence failing to stay contained.
Stops bleeding and heals sores - whether taken internally for nosebleed, bloody stool, or uterine bleeding, or used externally for wounds, hemorrhoids, and weeping lesions, Wu Bei Zi is valued for its contracting and drying action.

Gu Chong Tang (固冲汤) - a womb-stabilizing and bleeding-controlling formula in which Wu Bei Zi contributes strong astringency for flooding and spotting with instability.
Yu Suo Dan (玉锁丹) - classical essence-securing formula pairing Wu Bei Zi with Fu Ling and Long Gu for seminal emission and lower leakage from Kidney insecurity.
Wu Bei Zi with Ming Fan external wash - traditional hemorrhoid and prolapse method using its strong topical astringent and tissue-tightening action.

Me and Qi describes Wu Bei Zi as a strongly astringent cold herb that restrains the Lungs, binds the intestines, stops sweating, secures essence, stops bleeding, and heals sores.
The same source cites Ben Cao Gang Mu in describing Wu Bei Zi as able to restrain the Lungs, stop bleeding, transform phlegm, stop thirst, and collect sweat, while also recording the famous navel application for night sweats.
Sacred Lotus agrees on the core profile of sour, salty, and cold, entering the Lung, Large Intestine, and Kidney channels, and places Wu Bei Zi among the key astringent and stabilizing medicinals.