The objective of this study was to develop once-daily metformin hydrochloride sustained-release tablets (MHSRT) and evaluate their in vitro release behavior. MHSRT were prepared by the film coating method. The in vitr...The objective of this study was to develop once-daily metformin hydrochloride sustained-release tablets (MHSRT) and evaluate their in vitro release behavior. MHSRT were prepared by the film coating method. The in vitro drug release rate of MHSRT and the commercial tablets Fortamet? made in the United States of America in water was fitted with zero order kinetic equation, and Ritger-Peppas kinetic equation in 0.1 M HCl and pH 6.8-phosphate buffer, respectively. The similarity factor f2 values of MHSRT in three different dissolution medium were 82, 80 and 74, respectively in comparison with imported Fortamet?, which were all greater than 50. The results of storage-stability showed that MHSRT were stable for at least 6 months under stress condition (40℃ ± 2℃, RH 75% ± 5%). Therefore, in this study, MHSRT were successfully prepared using optimized formulation technologies that meet mass produce. The in vitro release behavior of MHSRT was almost similar to that of imported Fortamet?.展开更多
AIM To prepare buspirone hydrochloride buccal adhesive tablet and investigate factors that influence drug release behavior and the drug release mechanism. METHODS Buspirone hydrochloride buccal adhesive tablet was pre...AIM To prepare buspirone hydrochloride buccal adhesive tablet and investigate factors that influence drug release behavior and the drug release mechanism. METHODS Buspirone hydrochloride buccal adhesive tablet was prepared with double layers structure composed of drug core and adhesive layer. The materials of the drug core were carbopol 974 and lactose, the adhesive layers were carbopol 974 and HPMC K 4M . The influence of drug release factors such as adhesive layer component, adhesive layer weight and adhesive tablet hardness was investigated. The relationship between adhesive layer weight and drug release mechanism in vitro was studied. RESULTS The results showed that the weight of the adhesive layer and the hardness of adhesive tablet showed significant effects on drug release, but the adhesive layer component showed no significant effect. The optimum prescription of buspirone hydrochloride buccal adhesive tablet was carbopol∶HPMC=1∶1, adhesive layer weight=50%, and adhesive tablet hardness=4 kg. The study of drug release mechanism from adhesive tablet showed that it was double directions when adhesive layer weight was 20%, and single direction first then double directions when 33 33%, and single direction all along when 50%. CONCLUSION The speed and direction of drug release from adhesive tablet can be controlled by regulating adhesive layer weight.展开更多
文摘The objective of this study was to develop once-daily metformin hydrochloride sustained-release tablets (MHSRT) and evaluate their in vitro release behavior. MHSRT were prepared by the film coating method. The in vitro drug release rate of MHSRT and the commercial tablets Fortamet? made in the United States of America in water was fitted with zero order kinetic equation, and Ritger-Peppas kinetic equation in 0.1 M HCl and pH 6.8-phosphate buffer, respectively. The similarity factor f2 values of MHSRT in three different dissolution medium were 82, 80 and 74, respectively in comparison with imported Fortamet?, which were all greater than 50. The results of storage-stability showed that MHSRT were stable for at least 6 months under stress condition (40℃ ± 2℃, RH 75% ± 5%). Therefore, in this study, MHSRT were successfully prepared using optimized formulation technologies that meet mass produce. The in vitro release behavior of MHSRT was almost similar to that of imported Fortamet?.
文摘AIM To prepare buspirone hydrochloride buccal adhesive tablet and investigate factors that influence drug release behavior and the drug release mechanism. METHODS Buspirone hydrochloride buccal adhesive tablet was prepared with double layers structure composed of drug core and adhesive layer. The materials of the drug core were carbopol 974 and lactose, the adhesive layers were carbopol 974 and HPMC K 4M . The influence of drug release factors such as adhesive layer component, adhesive layer weight and adhesive tablet hardness was investigated. The relationship between adhesive layer weight and drug release mechanism in vitro was studied. RESULTS The results showed that the weight of the adhesive layer and the hardness of adhesive tablet showed significant effects on drug release, but the adhesive layer component showed no significant effect. The optimum prescription of buspirone hydrochloride buccal adhesive tablet was carbopol∶HPMC=1∶1, adhesive layer weight=50%, and adhesive tablet hardness=4 kg. The study of drug release mechanism from adhesive tablet showed that it was double directions when adhesive layer weight was 20%, and single direction first then double directions when 33 33%, and single direction all along when 50%. CONCLUSION The speed and direction of drug release from adhesive tablet can be controlled by regulating adhesive layer weight.
