Thanks for your query.
I suggest you to continue with medication as advised by your doctor,sometimes it takes 48 hours for fever to come down after medication.
every 6 hourly if fever is above 100F.
do tepid sponging in case of high fever
Give plenty of fluids and soft bland diet.
In case symptoms persist get him re evaluated by doctor as some routine tests may be required.
Wishing your child good health.