The main side effects of Xinguan booster injection are fever, local reaction, allergic reaction, etc. However, not everyone who receives booster injection will have adverse reactions, and the adverse reactions are different, and less common side effects may also occur. 1. Fever: the main side effects of booster shots are fever, inoculation booster shots is to better promote the production of antibodies, strengthen the effect of immunization, thereby reducing the chances of infection, a few people may have a low fever after inoculation, drink more water to better promote the body’s metabolism, the body’s excessive heat discharged in a timely manner. 2. Local reaction: due to the vaccination booster shot will cause local skin damage and drug stimulation, some people will have local reaction at the vaccination site, such as local skin congestion, pain, itching and so on. 3. Allergic reaction: some people do not have allergic reaction when they receive the first few shots of vaccine, but have allergic reaction when they receive booster shots, which may be related to the dosage and the composition of the vaccine from different manufacturers. If there is a mild allergic reaction to the vaccine, you can follow the doctor’s instructions after consultation and take chlorpheniramine maleate tablets and other anti-allergic drugs orally to relieve the symptoms. It is recommended to vaccinate when you are healthy, do not vaccinate after a cold or fever, observe the vaccination site for half an hour before leaving, try to avoid exertion, alcohol and spicy stimulating food, mild adverse reactions usually disappear in 2~3 days, if it lasts for a long time or the adverse reaction is more serious, you should consult a doctor for examination in a timely manner, and follow the doctor’s instructions for treatment.