title: Influence of lansoprazole treatment on diazepam plasma concentrations.
abstract: The possible influence of long-term treatment with lansoprazole on the single-dose pharmacokinetics of diazepam was investigated in 12 healthy male volunteers. In this double-blind randomized crossover study, 60 mg lansoprazole or placebo was administered once daily for 10 days. One hour after administration on day 7, 0.1 mg/kg diazepam was administered intravenously, and blood was collected up to 96 hours after the injection for plasma diazepam and desmethyldiazepam measurement. During the placebo session, the plasma elimination half-life, clearance, and volume of distribution of diazepam were 26.0 +/- 1.6 hours, 22.5 +/- 1.1 ml/hr/kg, and 0.82 +/- 0.04 L/kg, respectively. These parameters were not significantly different during the lansoprazole session. The mean plasma concentrations of desmethyldiazepam were similar in both sessions. These findings illustrate that long-term treatment with a therapeutic dose of lansoprazole does not interfere with the metabolism of diazepam.
authors.affiliation: Heymans Institute of Pharmacology, University of Gent, Belgium.
authors.forename: R A
authors.initials: RA
authors.lastname: Lefebvre
authors.forename: B
authors.initials: B
authors.lastname: Flouvat
authors.forename: S
authors.initials: S
authors.lastname: Karolac-Tamisier
authors.forename: E
authors.initials: E
authors.lastname: Moerman
authors.forename: E
authors.initials: E
authors.lastname: Van Ganse
mesh_terms: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000328:Adult; D000704:Analysis of Variance; D000897:Anti-Ulcer Agents / Q000494:pharmacology*; D003975:Diazepam / Q000097:blood / Q000493:pharmacokinetics*; D004311:Double-Blind Method; D004347:Drug Interactions; D006801:Humans; D064747:Lansoprazole; D008297:Male; D009853:Omeprazole / Q000031:analogs & derivatives* / Q000494:pharmacology; D012016:Reference Values
chemical_list: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000897:Anti-Ulcer Agents; D064747:Lansoprazole; D009853:Omeprazole; D003975:Diazepam