A Multinational, Randomized, Double-Blind, Placebo-Controlled, Parallel Group Study to Investigate the Efficacy, Safety and Duration of Effect of a Single Administration of Various Doses of Cetrorelix SR in Subjects With Histologically Confirmed Endometriosis

Inclusion Criteria: * Premenopausal female, * history of regular menstrual periods, * any of the symptoms dysmenorrhea, * dyspareunia or pelvic pain assessed as moderate to severe, * endometriosis confirmed by histology within 36 months, * use of barrier contraception throughout the study Exclusion Criteria: * Insufficient wash out period for other endometriosis treatments, * resection or destruction of endometriotic lesions less than 12 weeks prior to screening, * need for strong opioid analgesics, * need for immediate surgical treatment of endometriosis, * any condition that interferes with adherence to study procedures or study assessments