Hepatitis B vaccine and BCG vaccine have no effect if they are repeated. Hepatitis B vaccine is a vaccine to prevent hepatitis B, and BCG is a vaccine to prevent tuberculosis. Hepatitis B vaccine is a biological agent, belongs to the anti-hepatitis B virus vaccine, repeat vaccination of hepatitis B vaccine basically has no side effects, the main component is the surface antigen of hepatitis B virus, the injection can produce antibodies to avoid hepatitis B virus infection, repeat vaccination, there is no adverse effect on the human body. BCG vaccine is a vaccine to prevent tuberculosis, BCG vaccination can make the body immune to Mycobacterium tuberculosis, which can prevent the reproduction and dissemination of the bacteria in the body, and can prevent tuberculosis meningitis and cornual tuberculosis, in general, repeated vaccination does not have much effect on the health of the body, when fever, nausea and other symptoms of discomfort, please consult a doctor immediately. It is recommended that hepatitis B vaccination and BCG vaccination should be carried out in regular hospitals, pay attention to rest after vaccination, eat a light diet, eat less spicy and stimulating food, avoid strenuous exercise, pay attention to the wound do not touch water.