title: Modifications in cyclosporine (CsA) microemulsion blood concentrations by olestra.
abstract: OBJECTIVE
  Determine whether olestra alters the absorption of cyclosporine microemulsion in pediatric renal transplant recipients.
  
  
  METHODS
  Prospective, open-label, crossover pharmacokinetic study.
  
  
  METHODS
  General clinical research center in a university medical setting providing tertiary care.
  
  
  METHODS
  Seven pediatric-adolescent renal transplant recipients, ages 9 to 18, 5 to 24 months post-transplant with mean serum creatinine of 0.9 mg/dL (range, 0.7-1.6 mg/dL).
  
  
  METHODS
  Patients participated in 2 study periods: 1. Patients were given their usual dose of Neoral (Novartis Pharmaceuticals Corporation, East Hanover, NJ) without olestra, 2. patients were given their usual dose of Neoral combined with 0.35 g/kg (maximum of 16 g of olestra or approximately 2 ounces of Lays WOW [Frito Lay, Plano, TX] potato chips). The 2 study periods were separated by a minimum 7-day washout period. CsA blood concentrations were obtained at 1, 2, 3, 4, 6, 8, and 12 hours after drug administration.
  
  
  RESULTS
  Each patient in the study had a consistent decrease in area under the curve (AUC) when given olestra along with their usual dose of Neoral, compared with giving Neoral alone (5,018 ng*hr/mL versus 4,086 ng*hr/mL; P <.001). There also was a decrease in maximum concentration (Cmax) when Neoral was given with olestra compared with giving Neoral alone (1,202 ng/mL versus 876 ng/mL; P =.015). There was no statistical difference in the mean elimination rate or the trough values for both regimens (half-life 4.767 hours versus 4.771 hours and trough levels of 143 ng/mL versus 124 ng/mL).
  
  
  CONCLUSIONS
  Olestra decreases total CsA exposure in pediatric renal transplant recipients. The noted decrease in AUC was not adequately predicted by CsA trough values which could lead to rejection episodes in the clinical setting.
authors.affiliation: Pediatric Renal Dietition, Intermountain Pediatric-Adolescent Renal Disease Program, University of Utah Health Sciences Center, Salt Lake City, UT 84112-5350, USA.
authors.forename: Cynthia J
authors.initials: CJ
authors.lastname: Terrill
authors.forename: Jennifer
authors.initials: J
authors.lastname: Lill
authors.forename: K Troy
authors.initials: KT
authors.lastname: Somerville
authors.forename: Joseph R
authors.initials: JR
authors.lastname: Sherbotie
mesh_terms: D000284:Administration, Oral; D000293:Adolescent; D019540:Area Under Curve; D001682:Biological Availability; D002648:Child; D018592:Cross-Over Studies; D016572:Cyclosporine / Q000008:administration & dosage / Q000097:blood / Q000493:pharmacokinetics*; D018752:Diet, Fat-Restricted; D004655:Emulsions; D019358:Fat Substitutes / Q000008:administration & dosage / Q000494:pharmacology*; D005227:Fatty Acids / Q000008:administration & dosage / Q000494:pharmacology*; D005260:Female; D006084:Graft Rejection / Q000517:prevention & control; D006801:Humans; D007166:Immunosuppressive Agents / Q000008:administration & dosage / Q000097:blood / Q000493:pharmacokinetics*; D007408:Intestinal Absorption; D016030:Kidney Transplantation / Q000276:immunology; D008297:Male; D011446:Prospective Studies; D013395:Sucrose / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000494:pharmacology*
chemical_list: D004655:Emulsions; D019358:Fat Substitutes; D005227:Fatty Acids; D007166:Immunosuppressive Agents; D013395:Sucrose; C013692:sucrose polyester; D016572:Cyclosporine