Hairy Birthwort Classic Formulas … Natural Herb Library

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Dispels wind-damp and unblocks the collaterals - Xun Gu Feng was historically used for rheumatic pain, numb limbs, stiffness, and painful obstruction affecting the joints and channels.
Invigorates circulation and stops pain - traditional use extended to traumatic pain, channel tenderness, and pain that seemed fixed in the sinews and bones.
Applied in toxic or swollen conditions - folk use includes external treatment for bites, sores, or painful swellings.

Xun Gu Feng with Wei Ling Xian and Qin Jiao - historical wind-damp pairing for painful obstruction and channel stiffness.
Xun Gu Feng with Ru Xiang and Mo Yao - trauma-style combination for fixed pain and collateral obstruction.
External washes or powders with heat-toxin or bite remedies - a safer traditional direction than uncritical internal use.

Traditional herb references describe Xun Gu Feng as acrid, bitter, and neutral, entering the Liver and Kidney to dispel wind-damp, unblock the collaterals, and relieve pain.
The accepted source is Aristolochia mollissima Hance, now often treated taxonomically as Isotrema mollissimum, but the safety issues remain the same.
This record is retained for historical and identification completeness, not as a casual endorsement of modern internal use.