Overview Efficacy and Safety, Long-Term Study of NPC-16 to Treat Dysmenorrhea Status: Completed Trial end date: 2017-01-28 Target enrollment: Participant gender: Summary The purpose of this long-term study is to determine whether NPC-16 is effective in the treatment of dysmenorrhea. Phase: Phase 3 Details Lead Sponsor: NobelpharmaTreatments: Ethinyl EstradiolLevonorgestrel