The preparation method of the powder of which dissolution rate improves is characterized by including of the process that slightly soluble drug having acidic group (e.g., 3-(5-2-[5-methyl-2-(4-methylphenyl)-1,3-oxazol-4-yl]ethoxy}-3,4-dihydronaphthalen-1-yl)propanoic acid etc.) is made to metal salt solution and is neutralized to precipitate. By the method of the present invention, since a powder of which specific surface area increases and dissolution rate improves can be obtained, it is excellent as a preparation method of drug bulk.
该粉末的制备方法的特点在于包括以下过程:将具有酸性基团的微溶性药物(例如3-(5-2-[5-甲基-2-(4-甲基苯基)-1,3-
噁唑-4-基]乙氧基}-3,4-二氢
萘-1-基)
丙酸等)加入
金属盐溶液中,中和后沉淀。通过本发明的方法,由于可以获得比表面积增加和溶解速度提高的粉末,因此作为药物原料的制备方法非常优秀。