The influence of pentoxifylline (Trental)**Trental; Hoechst-Roussel Pharmaceuticals, Inc., Somerville, New Jersey. on the antifertility effect of intrauterine devices in rats†‡†Supported in part by a basic research grant from Eastern Virginia Medical School, Norfolk, Virginia; a grant from the Southern Medical Association, Birmingham, Alabama; and an award from The American College of Obstetricians and Gynecology/Mead Johnson Laboratories, Washington, D.C.‡Presented at the 39th Annual Meeting of the Society for Gynecologic Investigation, San Antonio, Texas, March 18 to 21, 1992.