Below are the main rubriks (i.e strongest indications or symptoms) of Allium Cepa in traditional homeopathic usage, not approved by the FDA.
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Coryza with frequent sneezing and profuse acrid discharge, corroding upper lip and nose. Lachrymation also profuse but bland. (Euph. reverse).
Cold extends to the bronchi, with profuse secretion of mucus; coughing and much rattling (Chelidonium Majus Chelidon).
Modalities worse in the evening, and in warm room, better in open air (the coryza).
Anyone who has cut up raw onions for coming knows what is the effect upon the eyes and nose -irritation, which causes violent sneezing and lachrymation. Then, if the homoeopathic law of cure is true, it ought to be a good remedy for coryza, and so it is; but like every other remedy, it cures its own peculiar and characteristic form of the disease.
It has constant and frequent sneezing, with profuse acrid discharge, which burns and corrodes the nose and upper lip, and it is worse in the evening and indoors and better in open air. It has also profuse lachrymation, with burning, biting and smarting of the eyes, but the discharge is bland; that is, it does not make the eyes sore afterwards. There may or may not be headache.