Sheng Mai Yin (Sheng Mai San) is a powerful tonic formula that addresses profound deficiency of Lung Qi (vital energy) and Yin (fluids). Shortness of breath, a weak pulse, sweating without exertion, and a dry or possibly red tongue are the typical signs. The presentation may be either chronic or acute. Profuse sweating caused by heat stroke in the hot weather, sports, for example, could lead to depletion of the Yin fluids in a short period of time. Conversely, spontaneous sweating or night sweating due to Qi deficiency may gradually deplete the fluids and further diminish to the Lung Qi, resulting in loss of strength and short of breath.

Due to the depletion of Yin fluids, a relative excess of Yang may result in heat signs. Irritability, palpitations and restlessness are commonly seen in such cases. Since this pattern involves primarily the upper burner (thoracic cavity), it is not surprising that this formula is also used for certain conditions involving the Heart. Sheng Mai Yin is also one of the only TCM formulas indicated for acute collapse.

Sheng Mai Pian is an elegantly balanced formula consisting of just 3 medicinal herbs. The chief herb is Dang Shen (Codonopsis) or Ren Shen (Ginseng) which both are famous and powerful Qi tonic herbs. Dang Shen is often used as a Ginseng substitute for its similar action, but is also milder and more affordable. Dang Shen tonifies the Qi of the Spleen and Lungs, restoring vital energy and also tonifies Blood. It also promotes the generation of fluids and stops sweating. Its applications include fatigue, tiredness, short of breath, and loss of appetite etc.^† Codonopsis is also reported to strengthen the immune function and increase the count of red blood cells and the level of hemoglobin.

Mai Dong or Mai Men Dong (Ophiopogon) is a deputy herb in this formula which has several functions. Mai Dong nourishes Yin and moistens the Lungs while clearing heat from the Heart and reducing irritability. Pairing Mai Dong with Ren Shen gives Sheng Mai Yin a very strong ability to generate fluids.

Wu Wei Zi (Schisandra) is an astringent herb that is used to stop sweating by containing Lung Qi. When the Lung Qi is weak, it is often unable to control the pores, allowing spontaneous sweating at any time of day or night, with or without exertion. Wu Wei Zi also stops cough and generated body fluids, in harmony with Ren Shen and Mai Dong.