The hormonal birth control patch (brand name: Ortho Evra) uses estrogen and progestin to prevent pregnancy. It is applied to 1 of 4 places -- the buttocks, abdomen, upper torso or outer arm. The patch is used on a 4-week cycle. You put on a new patch once a week for 3 weeks. You don't use a patch during the 4th week and your period will start.
The patch's side effects are similar to those of the pill. Women who use the patch should not smoke.
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