Is desogen (ethinyl estradiol and desogestrel) effective for endometriosis?

Can be, for pain: For treatment of pelvic pain surgery is helpful but many women get excellent results with medications. For fertility purposes surgical treatment or, alternatively ivf, are the only options.

Yes: Progesterone can help with the symptoms of endometriosis whether with estrogen like in the oral contraceptives or by itself like in depo-provera.