I'm allergic to either cephalaxin or ibuprofen... or both of
them, I don't know.
I took both medications once while I was having the flu... and my
eyes puffed up. At the same time, my throat was slowly constricting
itself.
I rushed back to the clinic and had an antihistamine jab, which
almost immediately cleared up the symptoms. The doctor then
declared me as being allergic to both medications, just to play
safe.