The purpose of this study is to look at the safety and effectiveness of Elagolix 150 mg when taken

together with a combined oral contraceptive (COC) that contains an estrogen and a progesterone, in premenopausal women with endometriosis pain.

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You may be eligible to take part in the study if you:

• Ages 18 to 49 years of age experiencing endometriosis pain

• Have documentation of a surgical diagnosis for Endometriosis

• Willing to utilize non-hormonal birth control and contraceptives