Development and validation of an in vitroein vivo correlation (IVIVC) model for propranolol hydrochloride extended-release matrix formulations

The objective of this study was to develop an in vitroein vivo correlation (IVIVC) model for hydrophilic matrix extended-release (ER) propranolol dosage formulations. The in vitro release characteristics of the drug were determined using USP apparatus I at 100 rpm, in a medium of varying pH (from pH 1.2 to pH 6.8). In vivo plasma concentrations and pharmacokinetic parameters in male beagle dogs were obtained after administering oral, ER formulations and immediate-release (IR) commercial products. The similarity factor f₂ was used to compare the dissolution data. The IVIVC model was developed using pooled fraction dissolved and fraction absorbed of propranolol ER formulations, ER-F and ER-S, with different release rates. An additional formulation ER-V, with a different release rate of propranolol, was prepared for evaluating the external predictability. The results showed that the percentage prediction error (%PE) values of C_max and AUC_0-∞ were 0.86% and 5.95%, respectively, for the external validation study. The observed low prediction errors for C_max and AUC0eN demonstrated that the propranolol IVIVC model was valid.