There is no fixed formula for Huo Xiang Zheng Qi San, which mainly consists of drugs such as Dahua Pi, Angelica dahurica, Perilla frutescens, Poria, Semen Armeniacae, Atractylodes Macrocephalae, Pericarpium Citri Reticulatae, Huperziae Miltiorrhizae, Pogostemonum and Licorice. The formula can be added or subtracted according to the disease. Patchouli Zhengqi San has the efficacy of relieving surface evils and eliminating dampness (relieving the evils externally and eliminating the dampness in the body), regulating qi and neutralizing the middle (regulating the qi of the spleen and stomach to make the functions of the spleen and stomach smooth), and is mainly used in the treatment of diseases such as malignant cold (fear of cold), fever, headache, fullness of the chest and diaphragm, and pain in the epigastric region (abdomen). If there is a high degree of superficial evil (evil qi on the surface of the muscles), with chills, fever and no sweating, Elsholtzia can be added to help relieve the superficial evil; if there is also qi stagnation and distension of the epigastrium (abdomen), Muxiang and Yanhuisuo can be added to move qi and relieve pain (to relieve pain by regulating the qi mechanism of the human body). However, this formula is not suitable for wind-heat colds, and is contraindicated in those who are allergic to this product, and should be used with caution in those with allergies. It should be noted that if you feel unwell, it is recommended to go to the hospital as soon as possible, do not self-medicate to avoid delaying the condition.