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

• Dispels wind-dampness and unblocks the channels and collaterals:  for wind-damp painful obstruction with pain in the joints.  Because it is good at unblocking the channels and invigorating the collaterals, it is also commonly used for spasm and cramps in the extremities, numbness in the extremities, and weak legs, including weakness as a sequelae of wind-stroke.*
• Clears heat and pacifies the Liver:  for patterns of ascendant Liver yang with such symtoms as headache and dizziness.*
• Clears and transforms damp-heat:  for damp-heat sores and itching, wind-damp-rash, or other forms of itching.*
• Also used for hypertension.*