Objectives: This paper was aim to report the effects of Gamisoyosan-gagambang (加味逍遙散加味方) on the Primary Dysmenorrhea patients. Methods: Two patients who had been suffering from primary dysmenorrhea were enrolled in this study. They received oriental treatment such as herbal medicine. We gave them Gamisoyosan-gagambang several times. During the treatments, we requested them to visit hospital once every two weeks. If they could not come to hospital, we called them to take follow-up. The progress of symptoms was evaluated by visual analogue scale(VAS). Results: After treatment, most symptoms were improved and also VAS was reduced. Conclusions: This clinical cases indicate that Gamisoyosan-gagambang is effective in treatment of the primary dysmenorrhea patients. More clinical data and studies are requested for the treatment of primary dysmenorrhea.