Side effects include nausea and vomiting, both of which were reported less frequently in women taking the progestin-only pills. Depo-Provera, approved by FDA in 1992, is injected by a health professional into the buttocks or arm muscle every three months. The benefits are similar to those of the minipill and another progestin-only contraceptive, Norplant. Norplant, approved by FDA in 1990, and the newer Norplant 2, approved in 1996, are the third type of progestin-only contraceptive. Made up of matchstick-sized rubber rods, this contraceptive is surgically implanted under the skin of the upper arm, where it steadily releases the contraceptive steroid levonorgestrel.
Norplant failures are rare, but are higher with increased body weight.
Some women may experience inflammation or infection at the site of the implant. Other side effects include menstrual cycle changes, weight gain, and breast tenderness. An IUD is a mechanical device inserted into the uterus by a health-care professional. The Paragard IUD can remain in place for 10 years, while the Progestasert IUD must be replaced every year. It's not entirely clear how IUDs prevent pregnancy.