Patchouli Zhengqi Shui can treat colds caused by wind-cold, internal dampness stagnation (stagnation of dampness in the body caused by a cold diet) or summer summer dampness (the body is easily invaded by summer heat and dampness in the summer), but it cannot treat colds caused by other factors. Pohoi Xiang Zheng Qi Shui has the effects of harmonizing the middle and relieving the surface, resolving dampness and regulating qi, etc. It can treat cold and flu symptoms caused by internal dampness stagnation, summer dampness and external wind-cold, such as vomiting, diarrhea, dizziness, headache, chest and diaphragm congestion (distension of the forehead and stomach), and epigastric distension and pain (abdominal distension and abdominal pain). It can also be used for gastrointestinal colds when the above symptoms are seen. However, patchouli is not effective in treating colds caused by other factors. Some patients may have adverse reactions such as skin rash, tachycardia and anaphylaxis after taking Huo Xiang Zheng Qi Shui. Avoid smoking, alcohol and spicy, cold and greasy food. It is not advisable to take tonic Chinese medicines at the same time during the medication. It is forbidden for those who are allergic to this product and ethanol, and should be used with caution for those with allergies. It is recommended that patients should consult a doctor when they have a cold, and the doctor will judge whether the cold can be treated with patchouli water according to the cause of the cold.