Toxicology is a field of medicine that studies the properties of poisonous substances, mechanisms of action of these substances on animal organisms, the pathological process (poisoning) caused by them, its treatment and prophylaxis. Toxicology will examine all kinds of nature poisons: chemical compounds, pesticides, radioactive substances, bacterial toxins and other non-organic, vegetative and other poisonous agents of animal nature. The oldest medicine was still familiar with some poison and poisoning, which depicts discoloration and gallons work.