You can’t get a booster shot with metronidazole. Taking metronidazole for vaccination may result in adverse reactions and prolonged recovery. The new crown vaccine needs to be in a healthy state, is taking metronidazole indicates that the body has inflammation and infection, in the period of illness, the immunity is relatively low, at this time to play the new crown vaccine will affect the production of antibodies, so that the vaccine can not be achieved the normal effect, and there is a risk of adverse reactions. During the use of metronidazole, the patient’s physique is weak, after the vaccine appeared body fatigue and fatigue and other symptoms, resulting in prolonged recovery from the disease, affecting normal life and work. In general, no matter what the vaccine is, it should not be administered during the onset of other diseases, as this will not allow the vaccine to exert its original effect and may also cause adverse consequences. Consult your physician for advice.