Sustained-release Tablets is prepared using metformin hydrochloride as model drug,soluble HPMC and insoluble ethylcellulose as sustained material.

• 以盐酸二甲双胍为模型药物,以羟丙甲基纤维素及乙基纤维素为缓释骨架材料,制备相对刚性骨架缓释片。