thanks for your query at HCM
your child is having very high grade fever
, whenever there is fever do cold
sponging with wet cloth until fever comes down .
you have not mentioned age and weight .
if child is old enough to drink give plenty of drinking water .
syrup 15 miligram per kilogram three times a day .
give ors sachet mixed in water and give as much as child can drink
sachet half sachet mixed in water twuce daily .
this for temporarily if not controlled you might have to visit er