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for sunday start, you must use non-hormonal back-up contraception (such as a condom, spermicide or diaphragm) for the first seven days of patch use. If these instructions are followed, the birth control patch will be as effective during the first cycle as it will be in subsequent cycles of use.
For first day start, if you apply your first patch during the first 24 hours of your period, no additional back-up is required. If you do not use the first birth control patch within the first 24 hours of your period, a non-hormonal back-up contraception (such as a condom, spermicide or diaphragm) should be used for the first seven days of patch use. If these instructions are followed, the birth control patch will be as effective during the first cycle as it will be in subsequent cycles of use.