Kaunitz, Andrew M.; Bissonnette, François; Monteiro, Ilza; Lukkari-Lax, Eeva; Muysers, Christoph; Jensen, Jeffrey T.
Obstetrics & Gynecology. 116(3):625-632, September 2010.
doi: 10.1097/AOG.0b013e3181ec622b
The levonorgestrel-releasing intrauterine system is more effective in reducing menstrual blood loss and alleviating heavy menstrual bleeding than oral medroxyprogesterone acetate.