A birth control device inserted directly into the uterus to prevent pregnancy. Intrauterine devices are also an extremely effective form of contraception, with failure rates as low as 0.2 percent. They are also reversible, and they do not permanently affect fertility. However, they do not provide protection against sexually transmitted infections (STIs).

Using an intrauterine device can cause vaginal dryness, particularly with hormonal IUDs (this is also common with other hormonal birth control treatments). Physicians often recommend water-based personal lubricants for patients who experience this symptom.