The rapid growth of pharmaceutical and chemical industry has unleashed a tidal wave of toxins into the environment. Prior to harnessing the ever-increasing array of synthetic compounds for commercial or agricultural use, it is imperative to be cognizant of all the potential adverse effects associated with these chemicals. This is where toxicology comes into the picture, toxicology is the study of the interaction of various compounds (chemical or biological) with the biological system (be it at organismal level or environmental). Over the years, toxicology has played a vital role in the screening newly developed drugs before they can be used in humans; scientists are able to follow the drug behavior prior to their use in humans. Toxicology testing can be performed on cell-lines and on a wide variety of animals such as mice, rats, and hamsters.