Last week, the nurse said my son's medicine (收鼻液分沁 due to allegry) may make him sleepy. However, he was still very active and didn't sleep earlier. Then, we checked with the nurse again. She said that medicine usually makes children sleepy but some may be more active, ie. the reaction is opposit. So, we asked the doctor to change another medicine. The new one did really make him sleepy. Maybe you can call the nurse and check again.
Children are usually not feeling well when taking medicine, so they may be more 脾氣暴燥 and 扭計.