How does ORTHO EVRA prevent pregnancy?

The ORTHO EVRA birth control patch is 99 percent effective when used correctly. Clinical studies have compared ORTHO EVRA with birth control pills and found it to be equally effective.
ORTHO EVRA prevents pregnancy the same way as birth control pills. It works primarily by preventing ovulation, which means that the ovary does not release an egg to be fertilized. ORTHO EVRA also causes changes to the cervical mucus (making it more difficult for sperm to enter the uterus).
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