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

• Clears heat and cools the blood:  for all warm-heat pathogen dieseases where heat enters the nutritive level causing very high fever, thirst, and a scarlet tongue.  Also indicated in cases of hemorrhage due to heaqt entering the blood level.*
• Nourishes the yin and generates fluids:  for yin deficiency with heat signs, as well as injury to the fluids.  Manifestations include dry mouth, continuous low-grade fever, and constipation.  Also for throat pain associated with yin deficiency and wasting and thirsting disorder.*

Sheng Di Huang - Rehmanniae Radix