Correct use of half-summers generally does not produce side effects, contraindications are mainly allergic to half-summers, pregnancy and maternity, Yin deficiency, internal heat, epistaxis patients and so on. The Chinese medicine has a certain degree of toxicity, so often use ginger concoction after use, but excessive long-term consumption will still produce certain toxic side effects on the body, the most common is that there will be abdominal pain, diarrhea, nausea, vomiting, and sore throat, numbness of the mouth and tongue and other discomforts. At the same time for the half-summers allergic to the crowd, may also appear skin itching and hives and other discomforts. Therefore, when using half-summers, must be cautious, need to follow the doctor’s instructions to use medication, not the right evidence, half-summers allergic to the crowd, pregnant women, lactating women, deficiency of yin and internal heat, epistaxis of the patient and so on as far as possible not to use half-summers, otherwise not only the effect of the counterproductive, and may be a serious complication. It is recommended to take half-sia under the guidance of a doctor to avoid adverse effects.