These small plastic rods are implanted in women's arms for up to7 years. Prescription is required and can cost. Effective rate is than 1 pregnancy for every 100 women every year. Effectiveness has decreased with those women who are higher in weight. Safe for all women, however, bleeding and irregular menstruation can occur. Also, there is no STI protection.
IUD long term contraceptive option. two types: Copper IUD: Paragard. Hormone free. Works by impairing the mobility of the sperm and making it difficult for a fertilized egg to implant. Needs to be replaced after 10 years. May cause a heavier period. Hormonal IUD: Mirena. Works by thickening the cervix mucous and thins the lining of the uterus, as well as a low dose of progesterone inhibiting ovulation. Needs to be replaced after 5 years. May decrease period flow.