The invention provides a hydrogel-type sustained-release preparation comprising (1) at least one drug, (2) an additive which insures a penetration of water into the core of the preparation and (3) a hydrogel-forming polymer, wherein said preparation is capable of undergoing substantially complete gelation during its stay in the upper digestive tract such as stomach and small intestine and is capable of releasing the drug in the lower digestive tract including colon.
By the preparation of the invention, the drug is efficiently released and absorbed even in the colon so that a steady and sustained release effect can be achieved.
本发明提供了一种
水凝胶型缓释制剂,包括(1)至少一种药物,(2)一种保证
水分渗透进入制剂核心的添加剂,和(3)一种
水凝胶形成聚合物,其中该制剂能够在上消化道(如胃和小肠)停留期间经历几乎完全的凝胶化,能够在下消化道(包括结肠)释放药物。通过本发明的制剂,药物能够高效地在结肠中释放和吸收,从而实现稳定和持续的缓释效果。