Homoeopaths treat disease using very low dose preparations administered according to the principle that" like should be cured with like." Practitioners select a drug that would, if given to a healthy volunteer, cause the presenting symptoms of the patient. For example, the homoeopathic remedy Allium cepa is derived from the common onion. Contact with raw onions typically causes lacrimation, stinging and irritation around the eyes and nose, and clear nasal discharge. Allium cepa might be prescribed to patients with hay fever, especially if both nose and eyes are affected.
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