During the time and resource-consuming processes of drug discovery and development, enormous number of molecular compounds are evaluated using diverse parameters in order to determine the selection of which chemicals to synthetize, test and promote, with the sole aim of identifying those with the best likelihood of becoming an effective medicine for the patients. The molecules must show high biological activity together with low toxicity. Chemical absorption, distribution, metabolism, excretion (ADME), play key roles in drug discovery and development.