Intrauterine devices (IUDs) and implantable contraceptives may not be popular, but they are among the most reliable contraceptive methods available."IUDs and implants should be considered first-line contraceptives for a majority of women,” says Eve Espey, MD, MPH, an associate professor of obstetrics and gynecology at the University of New Mexico in Albuquerque. She co-authored a paper on these choices in the American Congress of Obstetricians and Gynecologists’ Practice Bulletin.