Overview Efficacy and Safety, Long-Term Study of NPC-01 to Treat Dysmenorrhea Associated With Endometriosis Status: Completed Trial end date: 2012-02-01 Target enrollment: Participant gender: Summary The purpose of this long-term study is to determine whether NPC-01 is effective in the treatment of dysmenorrhea associated with endometriosis. Phase: Phase 3 Details Lead Sponsor: NobelpharmaTreatments: EstradiolEthinyl EstradiolNorethindroneNorethindrone acetate