title: Comparative bioavailability of two tablet formulations of ranitidine hydrochloride in healthy volunteers.
abstract: This investigation was carried out to evaluate the bioavailability of a new tablet formulation of ranitidine HCl (300 mg), Ranid, relative to the reference product, Zantac, (300 mg) tablets. The bioavailability was carried out on 24 healthy male volunteers who received a single dose (300 mg) of the test (T) and the reference (R) products in the fasting state, in a randomized balanced 2-way crossover design. After dosing, serial blood samples were collected for a period of 16 hours. Plasma harvested from blood was analyzed for ranitidine by a sensitive and validated high-performance liquid chromatographic assay. The maximum plasma concentration (Cmax), area under the plasma concentration time curve up to the last measurable concentration (AUC0-t), and to infinity (AUC0-infinity) and the absorption rate (Cmax/AUC0-infinity) were analyzed statistically under the assumption of a multiplicative model. The time to maximum concentration (Tmax) was analyzed assuming an additive model. The parametric confidence intervals (90%) of the mean values of the pharmacokinetic characteristics (AUC0-t, AUC0-infinity), Cmax and Cmax/AUC0-infinity) for T/R ratio were in each case well within the bioequivalence acceptable range of 80-125%. The test formulation was found bioequivalent to the reference formulation by the Schuirmann's two one-sided t-tests and by Wilcoxon Mann Whitney two one-sided tests procedure. Therefore, the 2 formulations were considered to be bioequivalent.
authors.affiliation: College of Pharmacy, King Saud University, Riyadh, Saudi Arabia.
authors.forename: S A
authors.initials: SA
authors.lastname: Bawazir
authors.forename: M W
authors.initials: MW
authors.lastname: Gouda
authors.forename: Y M
authors.initials: YM
authors.lastname: El-Sayed
authors.forename: K I
authors.initials: KI
authors.lastname: Al-Khamis
authors.forename: M J
authors.initials: MJ
authors.lastname: Al-Yamani
authors.forename: E M
authors.initials: EM
authors.lastname: Niazy
authors.forename: K A
authors.initials: KA
authors.lastname: Al-Rashood
mesh_terms: D000328:Adult; D019540:Area Under Curve; D001682:Biological Availability; D002851:Chromatography, High Pressure Liquid; D018592:Cross-Over Studies; D005215:Fasting / Q000097:blood; D006635:Histamine H2 Antagonists / Q000008:administration & dosage / Q000097:blood* / Q000493:pharmacokinetics*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011899:Ranitidine / Q000008:administration & dosage / Q000097:blood* / Q000493:pharmacokinetics*; D013810:Therapeutic Equivalency
chemical_list: D006635:Histamine H2 Antagonists; D011899:Ranitidine