According to the definition by ABDA (Federal Union of German Associations of Pharmacists) and DPhG (German Pharmaceutical Society) from 1997 clinical pharmacy is the science and practice of evidence-based drug use in patients. In addition to pharmaceutical chemistry, biology, technology and pharmacology, clinical pharmacy thus extends the focus from a more isolated view of the drug to the individual patient or population using the drug. The collection and evaluation of scientifically based information on the safe, appropriate and cost-effective use of drugs is just as much a subject of clinical pharmacy as identifying problems related to drugs and health and developing strategies for solutions together with patients, physicians and other health professionals. The aim is to optimise drug therapy and to improve the patients' quality of life. In this way, clinical pharmacy makes a significant contribution to safety during drug therapy.
Pharmaceutical Biochemistry deals with the biochemical background of drug action at a molecular level, including aspects of drug metabolism and clinical chemistry. The biosynthesis and functions of biomolecules in interplay within the cellular metabolism, its regulation and adaptation are observed. Further aspects include the regulation of gene expression, transcription and processing of RNA, signal transduction and molecular biological transport processes. All these structures and processes represent the status in healthy and partially diseased organism and are investigated with regard to desired and undesirable drug effects at the molecular, cellular, tissue or overall body level and partly over time (disease and recovery progress). From the physiological and biochemical processes in an organism (bio)-chemical quantities can be derived as clinical-chemical parameters, of which the analytical recording and interpretation are the subject of clinical chemistry.