The prescriptions named after Sini San in Treatise on Febrile Diseases include Sini San, Sini Tang and Danggui Sini Tang. Four limbs syncope exists in all three indications, but its pathogenesis and medication are very different. The difference is as Zhou Yangjun said: "Sini decoction is aimed at returning to Yang, Sini powder is aimed at reconciliation, and Danggui Sini decoction is aimed at nourishing blood and dredging veins."

Sini Powder: It consists of Bupleurum, Fructus Aurantii Immaturus, Radix Paeoniae Alba and Radix Glycyrrhizae Preparata. It is an ancestral prescription for soothing the liver and relieving depression and harmonizing the liver and spleen. Indications: Yang deficiency, stagnation of liver and spleen. This is due to the introduction of exogenous pathogens into the meridians and the stagnation of Yang Qi at four o'clock, so the cold is only in the limbs, not in the wrists and ankles, and symptoms such as body heat and pulse string can still be seen.