Sijunzi decoction is an ancient prescription based on four basic Chinese herbal medicines: ginseng, atractylodes macrocephala, poria cocos and licorice, which is mainly used to treat spleen and stomach qi deficiency. This prescription is the basic prescription for treating spleen and stomach qi deficiency syndrome, and many prescriptions for invigorating spleen and benefiting qi in later generations have evolved from this prescription.

Ginseng in the prescription is sweet and warm, and it is king to replenish qi and tonify the middle; Atractylodes macrocephala strengthens the spleen and dries the dampness, and ginseng is the minister of benefiting qi and strengthening the spleen; Poria cocos is supplemented with dampness and spleen; Roasting licorice is the best way to relieve pain. Four tastes are peaceful, warm but not dry, nourishing but not strong, hence the name Sijunzi Decoction.