Toxicology is the science that studies the physical and chemical properties of poisons, the mechanisms of their action on the organism and changes its status under the influence of poisons. Toxicology is seeking funds for prevention and treatment of poisoning, as well as opportunities for beneficial use of toxic deistviyu in various fields of biology and medicine. In their tasks and methods of toxicology studies closely related to pharmacology (see). This is because some medicinal substances in high doses, can have toxic effects and, on the contrary, some poisons in small doses therapeutic.