It would be best to continue with the antipyretics, you could try some tepid sponging if the fever is very high.
Does he have any other associated symptoms of a sore throat, cold, etc?
If the symptoms still persist after a couple of days, it would be best to consult your doctor and get a proper clinical examination and blood tests if suggested by your doctor/ pediatrician.
It would help to maintain a healthy balanced diet as children tend to eat less when they are unwell.
Let us know about how he is doing, what your doctor advises and also if you need any other information.