title: Relative bioavailability of 3 different chlormezanone 200 mg preparations after single dose oral administration.
abstract: Eighteen male volunteers have been treated with 3 different oral formulations of chlormezanone according to a randomized 3-way change-over design. The test preparation was a tablet (Krewel), reference preparation 1 was a suspension (Krewel), and reference preparation 2 was a tablet (Muskel Trancopal, Sanofi Winthrop GmbH). All preparations contained 200 mg of chlormezanone. Divided in 3 periods the volunteers received single doses of the test and the 2 reference formulations, respectively. Blood samples have been drawn immediately prior to each administration and at 21 sampling points within 144 h after dosing. A wash-out period of 2 weeks was maintained between successive drug doses. Plasma concentrations of chlormezanone were determined by a validated reversed-phase HPLC method with UV detection, with a lower limit of quantification of 0.1 microgram/ml. The following mean values have been obtained for the test preparation: AUC0-infinity 121 micrograms x h/ml, Cmax of 2.9 micrograms/ml at 1.5 h, t1/2 38 h, after administration of the suspension: AUC0-infinity 111 micrograms x h/ml, Cmax 2.6 micrograms/ml, tmax 1.5 h, t1/2 40 h, and after administration of the reference tablet: AUC0-infinity 121 micrograms x h/ml, Cmax 3.0 micrograms/ml, tmax 1.6 h, t1/2 38 h. The test preparation shows a relative bioavailability of 109% compared to the suspension and has been proven to be bioequivalent to the reference tablet with regard to extent and rate of absorption.
authors.affiliation: Biokinet GmbH, Vienna, Austria.
authors.forename: H
authors.initials: H
authors.lastname: Schütz
authors.forename: A
authors.initials: A
authors.lastname: Eichinger
authors.forename: V
authors.initials: V
authors.lastname: Nitsche
authors.forename: R
authors.initials: R
authors.lastname: Hofmann
mesh_terms: D000284:Administration, Oral; D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D001682:Biological Availability; D002720:Chlormezanone / Q000008:administration & dosage / Q000097:blood / Q000493:pharmacokinetics*; D002851:Chromatography, High Pressure Liquid; D018592:Cross-Over Studies; D006801:Humans; D008297:Male; D009125:Muscle Relaxants, Central / Q000008:administration & dosage / Q000097:blood / Q000493:pharmacokinetics*; D012015:Reference Standards; D012044:Regression Analysis; D013056:Spectrophotometry, Ultraviolet; D013810:Therapeutic Equivalency
chemical_list: D009125:Muscle Relaxants, Central; D002720:Chlormezanone