Intra uterine device (IUD) is a highly effective contraceptive method but concerns about the risk of upper genital tract infection, often limits its use. Scientist believed that prophylactic antibiotic administration around the time of inserting IUD significantly reduces the risk of IUD related pelvic inflammatory disease (PID). This study is designed to investigate the effect of prophylactic antibiotic on pelvic inflammatory disease associated with IUD insertion.