Some research suggests that the risk of leg and lung blood clots may be higher for women who use the birth-control patch instead of the pill. The Food and Drug Administration said it updated the label on the Ortho Evra birth-control patch in January 2008 to reflect the results of one study that found women using the patch faced twice the risk of clots, compared with women on the pill. But a second study found no difference in risk between the two forms of birth control.

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