Endometriosis

Inclusion Criteria

- Women between 18 and 45 years of age, inclusive
- Women with endometriosis confirmed by laparoscopy or laparotomy within ten years but no later than 2 weeks before the Screening Visit
- A score of at least 30 on a 100 mm visual analog scale (VAS) for endometriosis-associated pelvic pain at Screening Visit and Baseline Visit
- Good general health (except for findings related to endometriosis, with or without infertility), as evidenced by medical history and complete physical and gynecological examination
- Willingness to use a barrier method of contraception is required

Exclusion Criteria

- Pregnancy or lactation (less than three months since delivery, abortion, or lactation before start of treatment)
- Wish for pregnancy within intended treatment period
- Before menarche or after menopause
- Amenorrhea (more than three consecutive months in the six months before screening)
- Undiagnosed abnormal genital bleeding
- Previous/use of hormonal agents
- Any disease or condition that may worsen under hormonal treatment
- Signs and/or symptoms of therapy-resistant endometriosis despite more than one prior attempt at drug treatment or surgical therapy
- Need for primary surgical treatment of endometriosis
- Regular use of pain medication due to other underlying diseases
- Contra-indication for the supportive analgesic medication (ibuprofen)