Pharmacology and Toxicology are allied scientific discipline concerned with investigations of physiological and biochemical actions of endogenous compounds and xenobiotics on living tissues. These studies range in scope from investigations at the molecular level to clinical pharmacological and toxicological responses in humans. The ability of pharmacologists to elucidate basic mechanisms of drug action in living cells and biological systems has permitted the development of a rational approach to drug design and use. In addition, pharmacologists and toxicologists study compounds to gain a better understanding of the molecular mechanisms of toxicity. It allows the students to develop close working relationships throughout the student's training and provides a high degree of flexibility in designing individual courses of study and research projects.