When we get a fever, it's the body's natural response to fighting an infection/illness. I wouldn't be too quick to jump to the pain killers, I would be more inclined to keep up his fluids and try and cool him naturally with tepid baths and facewashers first.
I read an article yesterday on parents overdosing their kids on paracetemol and ibuprofen. They recommended leaving a temp under 40degrees. I'm on my phone but can't link it sorry.