title: Decrease in oral bioavailability of cyclosporin A by coadministration of probucol in rats.
abstract: To assess the pharmacokinetic interaction of cyclosporin A with probucol, we administered cyclosporin A (10 mg/kg body weight) to rats orally or intravenously with or without pretreatment of probucol (10 mg/animal, daily for 8 days). The whole blood cyclosporin A concentration-time curves after oral administration showed a 34% reduction in peak concentration and a 30% decrease in area under the blood concentration-time curve (AUC) by administration of probucol. No apparent change in elimination half-life or volume of the central compartment was observed with the treatment of probucol. After intravenous administration of cyclosporin A, the blood levels could be described by a two-compartment open model. No differences were observed in the AUC, elimination half-life or total clearance of cyclosporin A by the pretreatment of probucol. Calculated bioavailability following oral administration of cyclosporin A decreased by 33% with the treatment of probucol. These results suggest that probucol may not profoundly influence the disposition of cyclosporin A. Coadministration of probucol could decrease the fraction of absorbed cyclosporin A after oral administration.
authors.affiliation: Department of Clinical Pharmacology, Jichi Medical School, Tochigi, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Sugimoto
authors.forename: K
authors.initials: K
authors.lastname: Sakamoto
authors.forename: A
authors.initials: A
authors.lastname: Fujimura
mesh_terms: D000284:Administration, Oral; D000818:Animals; D000924:Anticholesteremic Agents / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D001682:Biological Availability; D002784:Cholesterol / Q000097:blood; D018592:Cross-Over Studies; D016572:Cyclosporine / Q000008:administration & dosage / Q000009:adverse effects / Q000493:pharmacokinetics*; D004305:Dose-Response Relationship, Drug; D006937:Hypercholesterolemia / Q000139:chemically induced / Q000188:drug therapy; D007166:Immunosuppressive Agents / Q000008:administration & dosage / Q000009:adverse effects / Q000493:pharmacokinetics*; D007275:Injections, Intravenous; D008297:Male; D011341:Probucol / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D011897:Random Allocation; D051381:Rats; D017208:Rats, Wistar; D015430:Weight Gain / Q000187:drug effects
chemical_list: D000924:Anticholesteremic Agents; D007166:Immunosuppressive Agents; D016572:Cyclosporine; D002784:Cholesterol; D011341:Probucol