Homeopathy is a form of alternative medicine, first expounded by German physician Samuel Hahnemann in 1796, that treats patients with heavily diluted preparations which are thought to cause effects similar to the symptoms presented. Homeopathic remedies are prepared by serial dilution with shaking by forceful striking, which homeopaths term "succussion," after each dilution under the assumption that this increases the effect of the treatment. This process is referred to as "potentization".

Dilution often continues until none of the original substance remains. Apart from the symptoms of the disease, homeopaths use aspects of the patient's physical and psychological state in recommending remedies. Homeopathic reference books known as repertories are then consulted, and a remedy is selected based on the index of symptoms.

Homeopathic remedies are considered safe, with rare exceptions. However, some homeopaths have been criticized for putting patients at risk with advice to avoid conventional medicine such as vaccinations, anti-malarial drugs, and antibiotics. In many countries, the laws that govern the regulation and testing of conventional drugs do not apply to homeopathic remedies.

Claims of homeopathy's efficacy beyond the placebo effect are unsupported by the collective weight of scientific and clinical evidence. Supporters claim that studies published in reputable journals support the efficacy of homeopathy; however, there are only a handful of them, they are not definitive, and they have not been independently replicated. Several high-quality studies exist showing no evidence for any effect from homeopathy, and the few positive studies of homeopathic remedies have generally been shown to have problems that prevent them from being considered unambiguous evidence for homeopathy's efficacy.

Homeopathic remedies generally contain few or no pharmacologically active ingredients, and for such remedies to have pharmacological effect would violate fundamental principles of science. Modern homeopaths have proposed that water has a memory that allows homeopathic preparations to work without any of the original substance; however, the physics of water are well understood, and no known mechanism permits such a memory. The lack of convincing scientific evidence supporting homeopathy's efficacy and its use of remedies lacking active ingredients have caused homeopathy to be described as "pseudoscience" and (more plainly) as "quackery" by Oliver Wendell Holmes, Sr.

in 1842 and other more recent writers.

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