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Materia Medica Viva Volume 1 – Page 159

ALLIUM CEPA
Common red onion N.O. Liliaceae
Mode of preparation: For Homeopathic use we use the tincture of the onion or of the whole fresh plant. This is gathered from July to August.
THE ESSENTIAL FEATURES
Allium cepa has established an undisputed reputation for acting upon the upper respiratory system and in curing common colds that settle in the nose and travel downwards, with a watery, acrid discharge from the nose while at the same time there is redness of eyes with lacrimation which is bland. It affects primarily the left side of the nose and later on moves to the right side. There is aggravation from warm room and in the evening and amelioration from open air.
In my experience this remedy has been misused for this ailment (common colds) and has been prescribed too frequently when other remedies should have been indicated.
A note of warning: since this remedy has in its pathogenesis the tendency to drive the inflammation from the uppermost part of the respiratory system -the nose- downwards -towards the larynx and bronchii-, I have observed in especially sensitive patients with a tendency to developing allergic asthma that their respiratory difficulties are much aggravated from a wrong prescription of Allium cepa. I would warn you not to use high potencies in cases you may suspect such sensitivities and you are not sure about the remedy.
I have found out that if this remedy is really indicated, apart from the other local symptoms mentioned above, we must have an effect upon the head and the whole organism. The patient feels really rotten, has dullness, torpor, difficulty in thinking and much sleepiness. It is very doubtful whether a patient with a cold that has only the local symptoms on the nose or larynx with a clear head and no general weakness would react to this remedy.
It is a remedy that will cure cases of common colds that spread easily to the ears producing a lot of pains like Pulsatilla, Chamomilla,