To be able to match a remedy for every single patient, Homeopathy works based on the “like cures like” principle. This principle was first introduced by Dr. Samuel Hahnemann (1755-1843), creator of Homeopathy. However, the idea underlying this principle predates Dr. Hahnemann and can be traced back to the works of the Father of Medicine Hippocrates (460-377 B.C.) and Paracelsus (1493-1541).
In the course of his studies, which involved countless experiments on himself as well as on his fellow colleagues and patients, the physician and pharmacologist Hahnemann came to the conclusion that the best medicine for a sick person would be the one that is able to reproduce similar symptoms in a healthy person.
For example, coffee, which produces excitability and sleeping difficulty in healthy subjects, can be used as a homeopathic remedy to relieve sleeplessness. Also, the humble onion, which can cause a runny nose, sneezes and watery eyes, can (when prepared as a homeopathic remedy – Allum Capa), be used to treat the symptoms of a person suffering exactly that type of a cold.