title: Evaluation of bioavailability and pharmacokinetics of two isosorbide-5-mononitrate preparations in healthy volunteers.
abstract: The objective of this study was to determine both the pharmacokinetic parameters and the bioavailability of two commercial 20-mg isosorbide-5-mononitrate (IS-5-MN) preparations (test and reference preparation) after single oral administration. For this purpose, the test and the reference preparation were examined in 24 healthy male volunteers according to a randomized 2-way cross-over design, blood samples were withdrawn up to 24 hours postadministration, and plasma concentrations of IS-5-MN were quantified by a gas chromatography (GC) method. Both preparations led to peak plasma levels of approximately 360 ng/mL IS-5-MN in the mean 0.76 hour (test) and 0.94 hour (reference preparation) after application; the plasma half-lives were about 5.2 hours, and for the areas under the curve (AUC(0-infinity)), mean values of 2741 (test preparation) and 2742 hour.ng/mL (reference preparation) were found. The statistical comparison (analysis of variance, confidence intervals) of the pharmacokinetic parameters found in the study resulted in bioequivalence of both IS-5-MN preparations. The undesired side effects/concomitant symptoms observed are known to occur after IS-5-MN administration.
authors.affiliation: L.A.B. Gesellschaft für Pharmakologische Untersuchungen mbH & Co, Neu-Ulm, Federal Republic of Germany.
authors.forename: V
authors.initials: V
authors.lastname: Hutt
authors.forename: R
authors.initials: R
authors.lastname: Theodor
authors.forename: G
authors.initials: G
authors.lastname: Pabst
authors.forename: R
authors.initials: R
authors.lastname: Bonn
authors.forename: E
authors.initials: E
authors.lastname: Fritschi
authors.forename: H
authors.initials: H
authors.lastname: Jaeger
mesh_terms: D000284:Administration, Oral; D000328:Adult; D001682:Biological Availability; D006801:Humans; D007548:Isosorbide Dinitrate / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000493:pharmacokinetics; D008297:Male; D013810:Therapeutic Equivalency; D014665:Vasodilator Agents / Q000008:administration & dosage / Q000493:pharmacokinetics*
chemical_list: D014665:Vasodilator Agents; D007548:Isosorbide Dinitrate; C030397:isosorbide-5-mononitrate