A levonorgestrel-releasing intrauterine system appears to be effective and well accepted by patients in the long-term treatment of those with moderate-to- severe endometriosis-related pain following conservative surgery. A randomized control trial found that the intrauterine system had a significantly lower average value of dysmenorrhea and noncyclic pelvic pain score when compared with patients receiving expectant management.

Abstract: Obstetrics & Gynecology, March 2012.