title: Pharmacokinetics of cyclosporine and steady-state aspirin during coadministration.
abstract: Anecdotal reports from clinical trials assessing the use of cyclosporine in the treatment of rheumatoid arthritis suggest an association between enhanced renal impairment and combined use of cyclosporine with nonsteroidal anti-inflammatory drugs. To explore possible pharmacokinetic contributions to this phenomenon, a randomized, two-period crossover investigation was performed in 24 healthy volunteers in which a single oral dose of 300 mg cyclosporine was administered alone and on day 10 of multiple oral dosing of aspirin 960 mg three times daily. Serial blood samples were obtained over 48 hours after each cyclosporine dose and over a steady-state dosing interval for aspirin on day 9 (aspirin alone) and day 10 (coadministration of cyclosporine and aspirin). Cyclosporine whole blood concentrations were determined by a specific monoclonal radioimmunoassay and plasma concentrations of acetylsalicylic acid and metabolites by high-performance liquid chromatography. Lack of a pharmacokinetic interaction was conclusively demonstrated for the rate and extent of cyclosporine and acetylsalicylic acid absorption and for the rate and extent of salicylic acid formation after a single dose of cyclosporine was coadministered during steady-state aspirin dosing. If a clear association between enhanced renal impairment and the combined use of cyclosporine and aspirin is substantiated, the underlying mechanism appears to be pharmacodynamic rather than pharmacokinetic.
authors.affiliation: Department of Human Pharmacology, Sandoz Pharma, Ltd., Basle, Switzerland.
authors.forename: J M
authors.initials: JM
authors.lastname: Kovarik
authors.forename: E A
authors.initials: EA
authors.lastname: Mueller
authors.forename: M
authors.initials: M
authors.lastname: Gaber
authors.forename: A
authors.initials: A
authors.lastname: Johnston
authors.forename: E
authors.initials: E
authors.lastname: Jähnchen
mesh_terms: D000328:Adult; D001241:Aspirin / Q000008:administration & dosage / Q000493:pharmacokinetics*; D016572:Cyclosporine / Q000008:administration & dosage / Q000493:pharmacokinetics*; D004347:Drug Interactions; D006207:Half-Life; D006801:Humans; D008297:Male; D008657:Metabolic Clearance Rate
chemical_list: D016572:Cyclosporine; D001241:Aspirin