FORMULATION DEVELOPMENT AND EVALUATION OF CANDESARTAN BUCCAL TABLETS

Buccal tablets are prepared by direct compression method using different polymers like carbopol, hydroxypropyl methylcellulose and sodium alginate. Nine formulations were prepared while (F1) to (F3) were prepared by taking individual concentrations whereas all the remaining formulations were prepared by taking combinations of polymers. Aim of study is to develop and optimize mucoadhesive buccal tablets of candesartan by direct compression method. All the batches were evaluated for thickness, weight variation, hardness and content uniformity. In-vitro release study is carried and release mechanisms were explored. Individual carbopol concentration (F1) has high swelling index with low water absorption ratio. Individual concentration of sodium alginate (F3) obtained high drug release, while low concentration of carbopol and high concentration of hydroxypropyl methylcellulose in combinations (F4) gave 86% drug release and with equal ratios of carbopol and hydroxypropyl methylcellulose (F7) gave 88% drug release. But low concentration of hydroxypropyl methylcellulose and high concentration of sodium alginate (F5) in combination form gave 95% drug release. While equal ratios of both hydroxypropyl methylcellulose and sodium alginate in combination (F8) gave 98% drug release. Among all formulations (F3) sodium alginate showed 93% drug release, while (F7) with equal ratio of hydroxypropyl methylcellulose and sodium alginate showed 98% drug release within 8 h. Compared to all polymers sodium alginate showed good drug release either in individual or combinations. All formulations followed zero order release kinetics.