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

• Clears and transforms phlegm-heat:  for heat in the Lungs with viscous sputum, stifling sensation in the chest, or coughing up blood.  Also for Gallbladder fire harboring phlegm and phlegm-heat.*
• Clears heat and stops vomiting:  for vomiting of bitter or sour matter due to heat in the Stomach with bad breath, aversion to heat, and a yellow, greasy tongue.  The Stomach heat can be due to either excess or deficiency. This herb is very effective at stopping vomiting and can be used, with other appropriate herbs, in treating other types of vomiting including that accociated with morning sickness.*