My Son Is 2.4 Years Old, And Is Very Active

My son is 2.4 years old, and is very active and not responds when called by name, runs around in new places and doesn't sit or stand for long and not started speaking much but for few words and doesn't repeat few actions, but follows some commands like get this get that. doctor had prescribed axepta 10 mg, half tablet per day, is it safe for such a small kid.