Ribavirin for children has the following side effects: 1. Causes adverse reactions in the gastrointestinal tract. Children may experience abdominal pain, diarrhea, vomiting, and poor appetite after taking ribavirin. 2. Some children may suffer from insomnia and poor sleep quality after taking ribavirin.3 Children taking ribavirin may also experience a drop in white blood cell and red blood cell counts, and even a drop in hemoglobin. Therefore, children must be careful when taking ribavirin, and the best way to apply ribavirin is to use it externally, such as applying ribavirin for spraying.