Children are not able to get vaccinated after taking medication for several reasons. The first is that children’s immunity is disturbed when they are sick, because most of the reason why children take medicine is because they are suffering from various diseases. At this time, the immune function of children’s bodies is more disturbed, and rashly giving vaccinations to children will often cause even more disturbance of the immune function, which will easily cause children to develop fever, cough and other symptoms. The second reason is that drugs may have a crossover effect with the vaccination, some of the children’s medications often affect the vaccination effect, for example, if children are vaccinated against Haemophilus pneumoniae and then take cephalosporin at this time, it will often interfere with the vaccination effect.