Allium cepa is
a very well-known homeopathic remedy derived from onions.
Allium cepa is used to treat conditions affecting
the mucous membranes of the nose, eyes, and throat. It is a popular
remedy in cases of allergies such as hayfever, and in cases of colds.
Symptoms that might indicate use of allium cepa include
runny/streaming nose, sneezing, irritated eyes and/or nose, acrid nasal
discharge, inflamed/irritated sinuses.