Recently, my 4-year-old's fever did not recede even though he had been on medication for 4 days. I was too worried and finally sent him to A & E Department. He stayed in hospital for 3 days for observation. Fortunately, he was discharged on the 3rd day.
His doctor said kids who have got a temperature must do 3 things:
1. drink lots of water, about 1 litre per day
2. take warm bath
3. wipe away the sweat on his body frequently
If his mood is fine, don't worry too much. If he is inert, better seek medical attention immediately.