The purpose of this research was to develop and evaluate buccal mucoadhesive controlled release tablets of lercanidipine hydrochloride using polyethylene oxide and different viscosity grades of hydroxypropyl methylcellulose individually and in combination. Effect of polymer type, proportion and combination was studied on the drug release rate, release mechanism and mucoadhesive strength of the prepared formulations. Buccal mucoadhesive tablets were made by direct compression and were characterized for content uniformity, weight variation, friability, surface pH, thickness and mechanism of release. In order to estimate the relative enhancement in bioavailability one optimized formulation was evaluated in rabbits. Further, placebo tablets were also evaluated for acceptability in human subjects. Results indicated acceptable physical characteristics of designed tablets with good content uniformity and minimum weight variation. Drug release and mucoadhesive strength were found to depend upon polymer type, proportion and viscosity. The formulations prepared using poly ethylene oxide gave maximum mucoadhesion. The release mechanism of most formulations was found to be of anomalous non-Fickian type. In vivo studies of selected formulation in rabbits demonstrated significant enhancement in bioavailability of lercanidipine hydrochloride relative to orally administered drug. Moreover, in human acceptability studies of placebo formulations, the designed tablets adhered well to the buccal mucosa for more than 4 h without causing any discomfort. It may be concluded that the designed buccoadhesive controlled release tablets have the potential to overcome the disadvantage of poor and erratic oral bioavailability associated with the presently marketed formulations of lercanidipine hydrochloride.

译文

:本研究的目的是单独和组合使用聚环氧乙烷和不同粘度等级的羟丙基甲基纤维素来开发和评估盐酸乐卡地平的口腔粘膜粘膜控释片剂。研究了聚合物类型,比例和组合对制剂的药物释放速率,释放机理和粘膜粘附强度的影响。通过直接压制制备颊粘膜粘附片剂,并对其含量均匀性,重量变化,易碎性,表面pH,厚度和释放机理进行表征。为了估计生物利用度的相对提高,在兔子中评估了一种优化的制剂。此外,还评估了安慰剂片剂在人类受试者中的可接受性。结果表明设计好的片剂具有可接受的物理特性,具有良好的含量均匀性和最小的重量变化。发现药物释放和粘膜粘附强度取决于聚合物类型,比例和粘度。使用聚环氧乙烷制备的制剂具有最大的粘膜粘附力。发现大多数制剂的释放机制是异常的非菲克式的。在兔子中对选定制剂的体内研究表明,相对于口服给药的药物,盐酸乐卡地平的生物利用度显着提高。此外,在人类对安慰剂制剂的可接受性研究中,设计的片剂在颊粘膜上粘附良好超过4小时,而不会引起任何不适。可以得出结论,所设计的颊粘膜控释片剂具有克服目前与盐酸乐卡地平市售制剂相关的口服生物利用度差和不稳定的潜力。

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