Cold and flu granules are a compounded proprietary Chinese medicine containing Chinese herbal ingredients that can have side effects. Some patients may experience palpitations, shortness of breath, insomnia and even increased blood pressure as side effects, mainly due to the presence of ephedra in the ingredients, which has the side effect of constricting blood vessels and enhancing heart rate. In addition, licorice also has certain hormone-like effects, and side effects of facial and lower limb skin edema can occur. Some patients may also develop allergies to these drugs in the ingredients, such as red rash, itching, and even side effects of laryngeal edema and choking cough. This proprietary Chinese medicine preparation is mainly suitable for the relief of wind-heat cold symptoms. It should not be used for the symptoms of cold and fear of cold, runny nose, headache, etc. that appear in patients with wind-heat cold, but will make these symptoms more obvious.