Asparagus and Ophiopogon japonicus can nourish lung yin, moisten lung dryness, clear lung heat, nourish stomach yin, clear stomach heat, and produce fluid to quench thirst. For constipation due to intestinal dryness caused by fever, fluid can be added to moisten the intestine to relieve constipation. The properties of the two drugs are similar, and they are used in succession.

However, Radix Asparagi is bitter and cold, and it is stronger than Radix Ophiopogonis in clearing fire and moistening dryness, and it is suitable for deficiency of kidney yin and hyperactivity of deficiency fire.

Ophiopogon japonicus is slightly cold. Although it is weak in clearing fire and nourishing, it is also less greasy, and it can clear the heart, remove annoyance and concentrate on peace of mind, so it can treat the symptoms of deficiency of heart yin and hyperactivity of heart fire.