Abstract
'Cheong Wi Dan (淸胃丹)' is a Chinese patent preparation which has been used for various diseases in Korea. This preparation consists of 19 powder crude drugs. Cheong Wi Dan is used for catarrh of the gastrointestines, indigestion, a pain in the chest and nausea. The microscopic method is ve교 useful to identify individual gradients in powdery mixture because it requires only a small amount of specimens. In this study, it is demonstrated that the microscopic method is very useful for the identification of 19 crude drug ingredients included in Cheong Wi Dan.