Chinese Silkvine Root-Bark Classic Formulas

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Dispels wind-damp and alleviates painful obstruction - Bei Wu Jia Pi is used for chronic wind-cold-damp bi, painful joints, stiffness, weakness of the lower limbs, and impaired flexion or extension, especially when older or constitutionally weak patients are involved.
Tonifies the Liver and Kidneys and strengthens sinews and bones - the bark is classically chosen when chronic bi disease coexists with low back soreness, weak knees, delayed walking, or soft tendons and bones rather than an isolated acute excess pattern.
Promotes urination and reduces edema - beyond musculoskeletal use, it appears in lower-body edema or damp leg-qi patterns in which warming, movement, and gentle drainage are all appropriate.
Supports recovery after long-standing weakness or trauma - traditional notes also describe use in medicinal wines and combined formulas for fractures, chronic weakness, and poor lower-body mobility.

Wu Jia Pi wine - classic medicinal-wine strategy recorded for chronic wind-damp pain, difficulty walking, low back weakness, and convalescent strengthening of sinews and bones.
Wu Jia Pi San - classical pairing with Du Zhong, Niu Xi, and related tonics for Liver-Kidney deficiency with weakness of the feet, waist pain, and poor tendon-bone support.
Wu Pi San - edema-focused formula logic in which Wu Jia Pi joins other peels and damp-draining medicinals to promote urination and reduce swelling.

TCM Wiki describes Cortex Acanthopanacis as pungent, bitter, and sweet, warm in nature, entering the Liver and Kidney channels, and acting to dispel wind-damp, tonify Liver and Kidney, strengthen tendons and bones, and induce diuresis.
American Dragon emphasizes its value for chronic wind-cold-damp bi with underlying Liver-Kidney deficiency, low back and leg weakness, restricted joint movement, and mild superficial edema.
Later trade and pharmacopeial notes warn that naming around Bei Wu Jia Pi can be inconsistent across regions, so the clinical task is to confirm genuine Acanthopanax gracilistylus root bark and not confuse it with toxic Xiang Jia Pi from Periploca.