The main objective of this study is to confirm the effectiveness and safety profile of NPC-01 in comparison with placebo in the treatment of dysmenorrhea (primary and secondary dysmenorrhea).~Additionally we also investigate the differences of effectiveness of NPC-01 in comparison with IKH-01 in the treatment of secondary dysmenorrhea as a reference, because IKH-01 is already marketed at them.~To achieve these, closed testing procedure is used in this study. After confirming statistical differences between NPC-01 and Placebo in the total dysmenorrhea, stratified analysis is carried out for primary dysmenorrhea (NPC-01, Placebo), and secondary dysmenorrhea (NPC-01, IKH-01 and Placebo).
The purpose of this study is to determine whether NPC-01 is effective in the treatment of dysmenorrhea.