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包含固体分散体的新型胃内漂浮缓释系统

吴伟, 周全, 曾仁杰, 李凤前   

  1. 1. 第二军医大学药学院, 上海 200433;
    2. 成都军区总医院药剂科, 成都 610083
  • 收稿日期:1999-01-27 修回日期:1999-06-02 出版日期:1999-12-15 发布日期:1999-12-15

A Novel Sustained Release Gastric Floating Tablet Containing Nimodipine Solid Dispersion

Wu Wei, Zhou Quan, Zeng Renjie, Li Fengqian   

  1. 1. School of pharmacy Second Military Medical University Shanghai 200433;
    2. Department of pharmacy General Hospital of Chengdu Military Region, Chengdu 610083
  • Received:1999-01-27 Revised:1999-06-02 Online:1999-12-15 Published:1999-12-15

摘要: 依据流体动力学平衡体系制备了一种包含尼莫地平固体分散体的新型胃内漂浮缓释系统, 提高难溶性药物尼莫地平溶出速率的同时控制其释放, 以达到既高效又长效的目的。尼莫地平固体分散体以poloxamer188为载体溶剂──熔融法制备。缓释漂浮片由尼莫地平固体分散体、羟丙甲纤维素、碳酸镁、十六醇等组成, 均匀设计法优化处方。较优处方于体内外均显示了较好的漂浮状态。体内同位素示踪研究表明该系统可明显延长体内的滞留时间, 而非漂浮片则很快通过吸收部位。饮食对该系统的体内转运有明显的影响, 空腹服用将大大缩短该系统的体内滞留时间。统计矩分析表明该系统的相对生物利用度为普通尼莫地平片的四倍, 体内平均滞留时间为其二倍。

关键词: 漂浮, 固体分散体, 尼莫地平, 缓释, 体内转运

Abstract: A novel sustained release gastric floating tablet containing solid dispersion withenhanced bioavailability and prolonged gastrointestinal resident time of the model drug nimodipine,apoorly soluble drug, was manufactured. Solid dispersion of nimodipine was prepared by a solventmelting method using poloxamer 188 as carrier. The floating tablet was made up of nimodipinepoloxamer 188 solid dispersion, hydroxypropylmethylcellulose, magnesium carbonate, hexadecanol,and several other additives. Formulations were optimized using an experimental design. Optimal formulation showed immediate buoyancy after introduction into simulated gastric fluid and maintained asustained floating state for over 10 h. Noninvasive scintigraphy also showed that the dosage formfloated to the surface of the gastric fluid from the bottom of the stomach. Food had an important effect on in vivo transit. Under fed conditions, the floating dosage form seemingly left small intestineabout 5 h after ingestion, and the non-floating tablet was emptied within 3 h. Under fasted conditions,the floating dosage form remained in the stomach and small intestine for only 3 h and the non-floatingtablet disintegrated and left the absorption site within 2 h. Pharmacokinetics in healthy male volunteers indicated that the relative bioavailability of this novel dosage form was about 4 times that of aconventional nimodipine tablet, and the mean resident time was twice that of the conventional tablet.

Key words: Floating, Solid dispersion, Nimodipine, Hydroxypropylmethylcellulose, Bioavailability, Gastrointestinal transit

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