Also known as a hormonal IUD (intrauterine device), this is a small device inserted into the uterus by a doctor or gynecologist. The contraceptive function of the IUD is based on two main mechanisms: firstly, the hormones released thicken the cervical mucus, making it more difficult for sperm to enter the uterus; secondly, the endometrium, necessary for the implantation of a fertilized egg, is less developed. Go to the FAQ to find out more.
