Children taking erythromycin can have the following side effects: first, causing gastrointestinal reactions. The most common side effect of children taking erythromycin is gastrointestinal reactions, which can lead to abdominal pain, diarrhea, and even vomiting, etc. With the application of 1-2 days, children will slowly adapt and the gastrointestinal reactions will be gradually reduced, and children can also be given the application of Ding Gui Er navel patch to relieve the gastrointestinal reactions. Second, the symptoms of allergy. Some children have a very special constitution and may develop hives after taking erythromycin, in which case they should avoid applying erythromycin. Finally, some children may also develop liver and kidney damage. Because erythromycin is mainly metabolized by the liver and kidneys, too large a dose or too long a duration of the drug can easily cause damage to the liver and kidneys of children.