title: Therapeutic drug monitoring of mycophenolate mofetil and enteric-coated mycophenolate sodium in patients with systemic lupus erythematosus.
abstract: OBJECTIVE
  Mycophenolic acid (MPA), the active form of mycophenolate mofetil (MMF) and enteric-coated mycophenolate sodium (EC-MPS), is used to treat systemic lupus erythematosus (SLE). MMF and EC-MPS pharmacokinetics were examined to devise guidance for therapeutic drug monitoring (TDM) for SLE patients with normal renal function.
  
  
  METHODS
  This observational study included 21 patients receiving MMF (1000 mg twice daily) and 14 taking EC-MPS (720 mg twice daily). MPA AUC between 0 and 12 h (AUC(0-12h)), C(max), T(max), and 12-h trough concentrations (C(12h)) were determined.
  
  
  RESULTS
  Means of dose-normalized MMF- or EC-MPS-MPA C(max) were 64.6 +/- 25 and 61.4 +/- 27.1 h mg/l, respectively. MPA T(max) for EC-MPS was longer and more variable than for MMF. MMF-MPA AUC(0-12h) and C(12h) were correlated (r = 0.78, p = 0.0001), but EC-MPS-MPA C(max) and single concentrations were weakly correlated. A limited-sampling strategy (LSS) combining C(max) and C(12h) gave satisfactory predictive performance to estimate MPA AUC(0-12h) after EC-MPS administration.
  
  
  CONCLUSIONS
  For TDM in SLE patients with GFR > 60 ml/min/1.73 m(2), C(12h) after MMF ingestion could predict MPA AUC(0-12h), while an LSS around T(max) should be used for patients on EC-MPS.
authors.affiliation: Pharmacie de l'Hôpital Haut-Lévêque, 5 avenue Magellan, 33604 Pessac, CHU de Bordeaux, Pessac, France. sarah.djabarouti@chu-bordeaux.fr
authors.forename: Sarah
authors.initials: S
authors.lastname: Djabarouti
authors.forename: Pierre
authors.initials: P
authors.lastname: Duffau
authors.forename: Estibaliz
authors.initials: E
authors.lastname: Lazaro
authors.forename: Candice
authors.initials: C
authors.lastname: Chapouly
authors.forename: Carine
authors.initials: C
authors.lastname: Greib
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Viallard
authors.forename: Jean-Luc
authors.initials: JL
authors.lastname: Pellegrin
authors.forename: Marie-Claude
authors.initials: MC
authors.lastname: Saux
authors.forename: Dominique
authors.initials: D
authors.lastname: Breilh
mesh_terms: D000284:Administration, Oral; D000328:Adult; D019540:Area Under Curve; D016903:Drug Monitoring / Q000379:methods*; D005260:Female; D005919:Glomerular Filtration Rate; D006801:Humans; D007166:Immunosuppressive Agents / Q000008:administration & dosage / Q000493:pharmacokinetics* / Q000627:therapeutic use; D008180:Lupus Erythematosus, Systemic / Q000188:drug therapy*; D008297:Male; D008875:Middle Aged; D009173:Mycophenolic Acid / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000493:pharmacokinetics / Q000627:therapeutic use; D013608:Tablets, Enteric-Coated; D013997:Time Factors
chemical_list: D007166:Immunosuppressive Agents; D013608:Tablets, Enteric-Coated; D009173:Mycophenolic Acid