The objective of the present study was to develop a pharmaceutically equivalent, stable, robust, cost effective and quality improved formulation of Gabapentin controlled release tablets by using different grades of controlled release polymer. The design of dosage form was performed by choosing Hydroxypropyl Methyl Cellulose (HPMC K100MCR), Hydroxypropyl Methyl Cellulose (HPMC K15MCR), Microcrystalline Cellulose (MCC) and Di-calcium phosphate polymers as matrix builders. The drug-polymer compatibility studies were performed. Blend Uniformity was studied and accordingly the flowability was optimized for the powder blend. Tablets were prepared by direct compression with free flowing powder. The network formed by HPMC, MCC and DCP had been coupled satisfactorily with the controlled resistance, in vitro release and FT-IR. Mean dissolution time was also reported to compare various dissolution profiles. The formula was finalized by comparing the in vitro dissolution with that of the innovator SR and IR tablets. Optimized formulation of Gabapentin was formulated using 23% HPMC K100MCR and 10% of DCP. In vitro drug release profile was examined 98.69% within 12h. The releases of the formulation were fitting to Hixson Crowell model suggesting controlled zero order release from the formulation. The results suggested that direct compression is a suitable method to formulate controlled release Gabapentin tablets and it can perform therapeutically better than conventional immediate release dosage form.
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