Pharmacodynamics are often broadly speaking outlined because the organic chemistry and physiological study of drug effects. These effects will embody those manifested at intervals mammals (including humans), microorganisms, or combos of organisms (e.g. infection). Pharmacodynamics places specific stress on dose-response relationships i.e. the connection between drug concentration and impact. pharmacodynamics is that the study of however a drug modifies AN organism, whereas materia medica is that the study of organism-mediated drug metabolism i.e. however the organism modifies a drug.