It is best not to get the hepatitis B vaccine when you have a cough, but to wait until the cough has improved. The main reason is that when you have a cough, your body’s resistance will be reduced, and in most cases you will be taking medication that will affect the production of antibodies to the vaccine, and after the hepatitis B vaccine is injected, it may also aggravate the symptoms of the cough and may cause a high fever, so it is best not to inject it, but to wait until the symptoms improve and you are not taking medication before injecting the hepatitis B vaccine. Generally, a delay of a few days in the second injection will not affect the production of antibodies. After the vaccination, you should pay attention to your diet and rest, avoid overexertion, do not drink alcohol, and do not eat other spicy and stimulating foods, pay attention to a light diet, and eat fresh vegetables and fruits.