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

• Promotes urination and leaches out dampness:  for the stagnation associated with dampness with such symptoms as urinary difficulty, edema, painful urinary dribbling, diarrhea, or dizziness.  Especially useful when there is damp-heat in the lower burner.*
• Settles ministerial fire in the Kidneys by draining damp-heat from the lower burner:  spermatorrhea due to lower burner damp-heat disturbing the ministerial fire of the Kidneys.*