Precautions after hepatitis B vaccination mainly include eating a light diet, not taking a bath within three days, and contraindications are mainly the use of immunosuppressive drugs. Because the needle eye will be left after the booster shot, alcohol is more irritating and may affect the recovery of the needle eye or aggravate the symptoms of side effects, so alcohol is not recommended after hepatitis B vaccination. After hepatitis B vaccination, you should avoid eating spicy and stimulating food, and you should not take a shower for three days, otherwise it may irritate the needle eye and make it infected. Seafood contains more foreign proteins, which may cause allergic reactions in some vaccinated people, and may also react with the medicinal properties of the vaccine, affecting the effect of hepatitis B vaccine. Diet after hepatitis B vaccination should be light. Hepatitis B vaccine is mainly through the stimulation of the body’s immune system to produce the appropriate antibodies, so as to play a role in preventing the hepatitis B virus, so the contraindication to hepatitis B vaccination is mainly the use of immunosuppressant drugs, otherwise it may make the body immunity decline, can not effectively play a role in the production of antibodies to hepatitis B, which reduces the effect of hepatitis B vaccine. After hepatitis B vaccination, the precautions should be read carefully, and in case of serious adverse reactions to the vaccine, it is recommended to go to the hospital in time for relevant examinations and systematic treatment after clarifying the cause of the disease.