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I'll be glad to help.
As you know in the case of both cold and flu - the primary cause is a virus and there's no cure for it.
Tylenol and motrin can control the fever however.
If the fever has been going on for over 2 weeks, there's probably another reason for the fevers other than just a virus. Most often, immune system becomes compromised during a viral infection - leading to a possible bacterial "co-infection".
I would recommend a work up by your provider for other causes - the most worrisome of which would be pneumonia.
Wish him a speedy recovery.