Homeopathic doctors write a form of non-medical prescription known as a "remedy," with the natural and synthetic substances serving as health-restoring "spiritual medicine." While the efficacy of such medicines is questionable, commercial homeopathic remedies are regulated and widely considered safe, according to WebMD.
Homeopathy involves developing a remedy and prescribing it in highly-diluted form; only trace amounts of active ingredients are generally used. The philosophy emerged in the 1700s when other early, experimental forms of medicine were also being developed. It is still practiced in many areas of the world, and often used for treating less-serious, but chronic conditions like allergies and arthritis.