Beijing Team Hospital Management Co., Ltd.

Junli Zheng

Wenbin Yang

Qingwei Jiang

Quanzhi Liu

Weifeng Yi

An osmotic pump controlled release tablet and the preparation method thereof are disclosed. The osmotic pump controlled release tablet is composed of tablet core, semipermeable membrane and optional film coating. The material of said semipermeable membrane is composed of ethyl cellulose and povidone in the ratio of 1:1&#x2dc;1:4 by weight. Said tablet core comprises drug containing layer and push layer. The osmotic pump controlled release tablet also characterizes in that; (1) the angle &#x3b8;formed by the outer curved surface of the drug containing layer and the lateral surface is 120&#xb0;-180&#xb0;; and/or (2) the ratio of Lto r is 0.27-1.0, wherein Lis the vertical distance from the central vertex of the outer curved surface of the drug containing layer to the plane formed by the intersection line between the outer curved surface of the drug containing layer and the lateral surface, and r is the radius of the tablet core.

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Beijing, China

Junli Zheng