patch

patch: a hormonal contraceptive method in the form of a patch that is worn on the lower back or upper arm and releases hormones to prevent pregnancy. It is 99 percent effective with perfect use at preventing pregnancy. The Patch is worn for a week at a time, and each week it is replaced with a fresh one. After three weeks, one week is “patch free,” which is when the person’s period will start. The patch does not protect against sexually transmitted infections and must be prescribed by a health care provider.