Thanks for writing your query.
Dexa injection contains Dexamethasone
which is a steroid and should be avoided unless strongly indicated.
should be avoided in fever. If some bacterial infection is also present in body, they can increase the infection in addition to other side effects of steroids.
For fever antipyretic Paracetamol
500 mg should be given. One tablet can be taken as and when required in mild fever or 3-4 times a day if fever is persistent.
I hope this is helpful to you.