title: Pharmacokinetic interaction between lansoprazole and theophylline.
abstract: The pharmacokinetic interaction potential of the new proton-pump inhibitor lansoprazole and theophylline was assessed in a double-blind, two-period (13-day duration per period), multiple-dose crossover study in 14 healthy male volunteers. Lansoprazole 60 mg or placebo once daily was coadministered with anhydrous theophylline 200 mg four times daily. Plasma theophylline concentrations were quantitated via high-performance liquid chromatography. Lansoprazole did not appear to affect substantially the absorption profile or clearance of theophylline. Theophylline area under the plasma concentration-versus-time curve over the 6-h dosing interval decreased slightly (13%) but statistically significantly during lansoprazole coadministration. As the magnitude of this effect was small, this interaction is likely to be clinically insignificant.
authors.affiliation: Drug Metabolism Department, Abbott Laboratories, Abbott Park, Illinois 6064-3500, USA.
authors.forename: G R
authors.initials: GR
authors.lastname: Granneman
authors.forename: M D
authors.initials: MD
authors.lastname: Karol
authors.forename: C S
authors.initials: CS
authors.lastname: Locke
authors.forename: J H
authors.initials: JH
authors.lastname: Cavanaugh
mesh_terms: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000042:Absorption; D000284:Administration, Oral; D000328:Adult; D002851:Chromatography, High Pressure Liquid; D018592:Cross-Over Studies; D004311:Double-Blind Method; D004347:Drug Interactions; D004791:Enzyme Inhibitors / Q000008:administration & dosage / Q000097:blood / Q000493:pharmacokinetics*; D006207:Half-Life; D006801:Humans; D064747:Lansoprazole; D008297:Male; D009853:Omeprazole / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000097:blood / Q000493:pharmacokinetics; D054328:Proton Pump Inhibitors; D013806:Theophylline / Q000008:administration & dosage / Q000097:blood / Q000493:pharmacokinetics*
chemical_list: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D004791:Enzyme Inhibitors; D054328:Proton Pump Inhibitors; D064747:Lansoprazole; D013806:Theophylline; D009853:Omeprazole