Toxicology is the qualitative and quantitative study of the adverse effects of chemicals and other materials on living organisms. The dose of the substance is an important factor in toxicology, as it has a relationship with the effects on the individual. Factors that influence toxicity include the dose, the route of exposure, shape and structure of the chemical, the species, individual human factors and environment. Toxicology and Pharmacology are both studies that involve in assessing the properties of chemicals and their actions on the body, but differ significantly in other areas. Pharmacology focuses on the therapeutic effects of pharmaceutical substances and how they can be used most effectively for medical purpose. Whereas, toxicology is closely related to the adverse effects that can occur in living organisms that come into contact with chemical compounds. Toxicologists are also concerned with determining the risk of certain substances with risk assessment tools.Toxicity literally means poisonous or noxious and, logos refers to the underlying science that explains the adverse effects of toxicity at the organismal level. Toxicology is therefore a multidisciplinary field which is at the interface of Biology, Chemistry and Medicine, with a special focus on Pharmacology.