《伤寒论·辨少阴病脉证并治》
少阴病，得了二三天，里实证具备而又见咽喉干燥的，应当急以攻下，用大承气汤。
少阴病，得之二三日，口燥咽干者，急下之，宜大承气汤。
For the Shaoyin syndrome that occurs two or three days after the onset of the disease and includes internal retention of pathogenic factors and dryness of the throat, the Da Cheng Qi Tang should be used immediately to expel the pathogens.