Low body temperature following intake of antipyratic can occur. Fever
induces host defence mechanisms preventing multiplication of organisms.
Although fever can also cause some complication, high dose or multiple antipyratics should not be given only to bring down the temperature.
Don't scare as ibuprofen
effect lasts for short duration and now his temperature borderline normal.
So I would suggest you to give paracetamol
instead of ibuprofen,as it chances of hypothermia
is less with paracetamol.