The present invention provides a prolonged-release liquid type of pharmaceutical preparation prepared by coating a pharmaceutically active drug-ion exchange resin complex which was treated previously with an impregnating agent, with a water permeable diffusion barrier material, followed by suspending the coated complex in a solution containing preservatives. The formulation of the present invention does not develop the rupture of the diffusion barrier film even in a solution containing preservatives. Therefore the formulation of the present invention is a prolonged-release liquid type of pharmaceutical preparation which is stable and does not lose the controlled release of the active ingredient.
本发明提供了一种长效缓释液态制剂,该制剂是通过用浸渍剂预处理过的药物离子交换
树脂复合物进行涂层,并用透
水性扩散障壁材料进行包覆,然后将包覆复合物悬浮在含有
防腐剂的溶液中制备而成。本发明的配方即使在含有
防腐剂的溶液中也不会破裂扩散障膜。因此,本发明的配方是一种稳定的长效缓释液态制剂,不会失去活性成分的控制释放。