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预胶化淀粉由马铃薯淀粉经过沉淀、过滤。乙醇洗脱和酶降解而获得。其优点是容易压片，各种理化性质的药物以不同比例与之混合，在较长时间内以零级速率恒定释药。预胶化淀粉片的释药速度可通过不同参数进行调节。以茶碱的预胶化淀粉片为例，当茶碱含量达3O％时，片剂在pH6．8
Pregelatinized starch is precipitated from potato starch and filtered. Ethanol elution and enzymatic degradation obtained. Its advantage is easy to tablet, a variety of physical and chemical properties of drugs in different proportions mixed with them, in a long period of time to zero-rate constant release. The release rate of pregelatinized starch tablets can be adjusted by different parameters. Theophylline pregelatinized starch tablets, for example, when the theophylline content of 3O%, the tablet at pH6.8