Homeopathy is a method of treatment that supports the body's own healing mechanism. It 's based on the law of similars "like cures like". A homeopathic remedy is an extremely pure, natural substance that has been diluted many times. In large quantities these subtances would cause the same symptoms the patient is trying to cure. In small, pure, diluted doses, it is not only safe and free from side effects, but it will trigger the body to heal itself.
Example: Allium cepa is a remedy that is used for watery eyes and runny nose, it is created from red onion. If you've cut open a red onion you'll notice the same symptoms. When the body creates a similar "symptom picture" to Allium cepa and you take a dose of Allium cepa, it activates the body to go about the process of stopping watery eyes and a runny nose.
Homeopathic remedies are regulated and manufactured under strict quality controls by the United States Food and Drug Administration-FDA. Homeopathic remedies come in several forms tablets, powders, liquids and ointments. Tablets are the most common and popular. Tablets are sugar pills with the liquid remedy infused. They are taken sub-lingually (dissolved under the tongue).
reference: google.com - homeopathy