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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To Mandragora Officinarium mandragora we may join the excessive use of garlic, onions, and leeks, because all physicians consider them very injurious, as occasioning deeply corrupted, malignant humidity, which inflame the blood, injure the eyes, the head, the brain, and stomach, predisposing to lethargy, sopor, somnolency, vertigo, epilepsy, and indeed insanity,
Onions go to the head with their acridity, and injure the brain, and if one eats too much of them they can indeed cause insanity and madness,
If many are eaten raw, they make a person foolish by reason of their aromas which mount into the head,
If too many are eaten, the onion-juice takes away the senses, by reason of its great heat and acridity, and greatly injures the stomach,
I find something injurious in the onion, and consider the opinion of Spigelius well founded, that a too free and continued use of it as food causes disturbances of the brain,
Inexpressible anxiety, turning himself hither and thither full of despair, with severe colic,
Pains, with sore fingers, make him frantic,
Very melancholy, with catarrh,
In the afternoon, after wine and coffee, he was completely confused and absentminded by much business, forgot and twisted everything in the utmost confusion (the fourth day),
He makes mistakes in spelling a foreign language,
Working people take in the morning onions with bread and salt for the bad air, as they do treacle, but idlers are made foolish, melancholy, and sleepy by it use,
Cardanus affirms that even the offspring of those who eat onions freely are disposed to insanity,≡ more ...