Excerpted from Bensky:  Chinese Herbal Medicine Materia Medica, 3rd ed.

• Calms the Liver, extinguishes wind, and controls spasms and tremors:  a very important herb for treating internal stirring of Liver wind, whether caused by heat or cold.  Used for headache, dizziness, childhood convulsions, epilepsy, tonic-clonic spasms, opisthotonis, tetany, and wind-stroke.*
• Extinguishes wind and alleviates pain:  for headaches, dizziness, and migraine headaches that occur with wind-phlegm patterns.  Also used for wind-stroke with hemiplegia, dizziness, and numbesss in the extremiities.  Can be used for both excessive and deficient conditions.*
• Disperses painful obstruction:  for wind-damp painful obstruction with pain and numbness of the lower back and extremities.*