A study of 1672 women, performed by doctors from the R.W. Johnson Pharmaceutical Research Institute, show Ortho EVRA, a weekly contraceptive patch, to be safe and effective. Ortho EVRA delivers a steady dose of progestin and estrogen, the same hormones found in oral contraceptives, into the bloodstream to prevent pregnancy. A patch is worn for one week at a time on the lower abdomen or buttocks. Women must wear patches for three consecutive weeks followed by one week without use of a patch. Side effects are similar to those experienced with other hormonal contraceptives. The Food and Drug Administration (FDA) is currently reviewing Ortho EVRA for approval. If approved, Ortho EVRA would be the first prescription contraceptive patch in the world.