Pharmacodynamics is the study of how a drug works on the body to elicit a biological response.  A large part of pharmacodynamics at OSOD involves studying relationships among drug dose, response duration and magnitude. In addition, these studies are often used to provide additional mechanistic data explaining how a drug induces a specific physiological response, such as disrupting specific cellular or biochemical processes, altering the production or secretion of proteins, or inhibiting enzyme activities.