Huo Xiang Zheng Qi Shui and Anti-Viral Oral Liquid can be used to treat colds and flu, but Huo Xiang Zheng Qi Shui is used for colds and flu caused by external wind-cold and internal dampness stagnation (the stagnation of dampness in the body caused by too cold diet, etc.); Anti-Viral Oral Liquid is used for wind-heat colds and flu, and their indications are not the same, so there is no comparison of the effectiveness of the two. Patchouli Zhengqi Shui is composed of Cangzhu, Chenpi, Houpu, Angelica dahurica, Poria, and Dabu Pi, etc. It has the efficacy of relieving surface dampness (relieving the evil qi of external sensation and dispelling the dampness in the body), regulating qi and neutralizing the middle (regulating the qi of the spleen and stomach to make the function of the spleen and stomach smooth). Pouli Xiang Zheng Qi Shui can be used for colds and flu caused by external wind-cold, internal dampness or summer dampness, with headache and heaviness, chest and diaphragm constriction, distension and pain in the epigastric region, vomiting and diarrhea; gastrointestinal colds and flu with the above symptoms. Nausea, vomiting, rash, itching, dizziness, flushing, palpitation (rapid heartbeat, often accompanied by panic) and other discomforts may occur after taking Huo Xiang Zheng Qi Shui, and is forbidden to those who are allergic to the product and the ingredients contained in it, or those who are allergic to alcohol. Antiviral Oral Liquid is composed of Panax quinquefolium, Gypsum, Rehmannia glutinosa, Radix et Rhizoma Dioscoreae, Rhizoma Dioscoreae and Rhizoma Ulmoides, etc. It has the efficacy of clearing away heat, dispelling dampness, cooling the blood and removing toxins (referring to the treatment of blood-heat and toxicity). It is used for wind-heat cold and influenza. This drug is prohibited for pregnant and lactating women. Patients are advised to use the medicine under the guidance of a doctor.