title: Glucuronidation in therapeutic drug monitoring.
abstract: BACKGROUND
  Glucuronidation is a major drug-metabolizing reaction in humans. A pharmacological effect of glucuronide metabolites is frequently neglected and the value of therapeutic drug monitoring has been questioned. However, this may not always be true.
  
  
  METHODS
  In this review the impact of glucuronidation on therapeutic drug monitoring has been evaluated on the basis of a literature search and experience from the own laboratory.
  
  
  RESULTS
  The potential role of monitoring glucuronide metabolite concentrations to optimize therapeutic outcome is addressed on the basis of selected examples of drugs which are metabolized to biologically active/reactive glucuronides. Furthermore indirect effects of glucuronide metabolites on parent drug pharmacokinetics are presented. In addition, factors that may modulate the disposition of these metabolites (e.g. genetic polymorphisms, disease processes, age, and drug-drug interactions) are briefly mentioned and their relevance for the clinical situation is critically discussed.
  
  
  CONCLUSIONS
  Glucuronide metabolites can have indirect as well as direct pharmacological or toxicological effects. Although convincing evidence to support the introduction of glucuronide monitoring into clinical practice is currently missing, measurement of glucuronide concentrations may be advantageous in specific situations. If the glucuronide metabolite has an indirect effect on the pharmacokinetics of the parent compound, monitoring of the parent drug may be considered. Furthermore pharmacogenetic approaches considering uridine diphosphate (UDP) glucuronosyltransferases polymorphisms may become useful in the future to optimize therapy with drugs subject to glucuronidation.
authors.affiliation: Department of Clinical Chemistry and Laboratory Medicine, Klinikum Stuttgart, Stuttgart, Germany. m.shipkova@klinikum-stuttgart.de
authors.forename: Maria
authors.initials: M
authors.lastname: Shipkova
authors.forename: Eberhard
authors.initials: E
authors.lastname: Wieland
mesh_terms: D016903:Drug Monitoring / Q000379:methods; D020719:Glucuronides / Q000378:metabolism*; D014453:Glucuronosyltransferase / Q000187:drug effects / Q000378:metabolism; D006801:Humans; D004364:Pharmaceutical Preparations
chemical_list: D020719:Glucuronides; D004364:Pharmaceutical Preparations; D014453:Glucuronosyltransferase