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  • Official Know-It-All
    Ortho Evra is 99 percent effective against pregnancy if it is used correctly. If you are using the patch for the first time, apply it on the first day of your menstrual cycle and it is effective immediately with no need for backup contraception. You also could choose a Sunday start, where the patch is applied the first Sunday following your cycle, and back up contraception is needed for one week until the patch takes effect.

    Source:

    Ortho Evra: Page 31

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