Comparative studies on the in vitro drug dissolution profiles for hydroxyzine hydrochloride tablets

OBJECTIVE: A significant practical problem in the standardization of dissolution testing is addressed. In vitro releasing characteristics of hydroxyzine hydrochloride tablets are presented to further the documentation of bioequivalency criteria. DESIGN: The assessment model compares the official United States Pharmacopeia disintegration approach for dissolution analysis with that of the Food and Drug Administration's recommended rotating paddle technique for inducing aqueous disruption of the solid oral dosage form. RESULTS: The rationale and significance of the study focuses attention on the variation in release of the active ingredient observed relative to the four formulation strengths. With differences in the extent of dissolution noted and official standards in mind, emphasis is placed on the development of an alternate test protocol. CONCLUSIONS: Dissolution data derived via ultraviolet spectrophotometry revealed statistically significant differences in the amount of hydroxyzine hydrochloride being released from its coated structure, the extent of which was found to be dependent on the acid nature of the simulated gastric dissolution medium used and intensity of mixing action employed.