Yes. The fears surrounding intrauterine devices (IUDs) stem mainly from problems with the Dalkon Shield, an IUD introduced in the 1970s. The construction of the Dalkon Shield increased the risk of bacterial infections, which resulted in pelvic inflammatory disease for many women. Today's IUDs are constructed differently and are safe and highly effective. IUDs are not good options for women at risk for contracting sexually transmitted infections, however.