title: Comparative bioavailability study of two salbutamol tablets in healthy adult volunteers.
abstract: This study was carried out to compare the rate and extent of absorption of a generic salbutamol in oral dosage form (Brethmol, 4 mg) with the proprietary equivalent product (Ventolin, 4 mg), in healthy adult subjects, under fasting conditions. The study was a single dose, randomized, two way crossover study with a four-week washout period. It involved 22 healthy volunteers who received a single dose (4 mg) of the test and the reference products after an overnight fast of at least 10 hours. Blood samples were collected at pre-dose and a serial of 14 samples were collected from each of the subject from 1 h until 48 h post-dose. Plasma concentrations of salbutamol were analyzed using GCMS method. The mean AUC(0-yen) values were 91.26 and 96.45 h.ng/ml for reference and test product, respectively. The mean C(max) values were 12.26 and 12.38 ng/ml and the mean t(max) values were 2.80 and 2.33 hours for reference and test product, respectively. Analysis of variance showed that the 90% confidence intervals on the relative difference of the ratio for the AUC(0-yen) and the C(max) for the test and reference products were contained within the bioequivalence limit (80 - 125%) (C(max): 89.8 - 110.5% and AUC(0-yen): 91.6 - 121.5%). There was no statistically significant difference for the t(max) between the test and reference formulations (p = 0.30). The test formulation was found to be bioequivalent to the reference formulation with regard to AUC(0-yen) and C(max). There was no statistically significant difference in Brethmol and Ventolin t(max). In conclusion, Brethmol and Ventolin are bioequivalent in healthy subjects.
authors.affiliation: Department of Pharmacology, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia. zamrichik@ummc.edu.my
authors.forename: Z
authors.initials: Z
authors.lastname: Chik
authors.forename: R C
authors.initials: RC
authors.lastname: Basu
authors.forename: R
authors.initials: R
authors.lastname: Pendek
authors.forename: T C
authors.initials: TC
authors.lastname: Lee
authors.forename: Z
authors.initials: Z
authors.lastname: Mohamed
mesh_terms: D000318:Adrenergic beta-Agonists / Q000008:administration & dosage / Q000097:blood / Q000493:pharmacokinetics*; D000328:Adult; D000420:Albuterol / Q000008:administration & dosage / Q000097:blood / Q000493:pharmacokinetics*; D001682:Biological Availability; D018592:Cross-Over Studies; D016568:Drugs, Generic / Q000493:pharmacokinetics*; D005260:Female; D006801:Humans; D008297:Male; D013607:Tablets
chemical_list: D000318:Adrenergic beta-Agonists; D016568:Drugs, Generic; D013607:Tablets; D000420:Albuterol