Inserted deep into the vagina like a diaphragm. Keeps sperm from entering vagina. May also prevent maturation and release of egg. A small amount of hormone is released constantly. The hormone prevents the ovaries from releasing eggs.
Hormone also thickens cervical mucosa.
Protection for up to 5 years. Injectable contraceptive . Prevents implantation of embryo. Sequence of two separate doses of certain oral contraceptives taken within 72 hours of unprotected intercourse, and taken 12 hours apart. Contraceptive use of U.S. Women 15 to 44 years old.