Ortho Evra contraceptive patch will come with a new warning about a study suggesting users could face twice the risks of blood clots compared with birth control pills.
The label instructions for Ortho Evra also will carry results from another study that found the chances of blood clots were equal with the patch and a birth control pill.
The patch, which is replaced once a week, is viewed as more convenient than daily pills.
Scientists have known for years that the estrogen used in contraceptives raises the risks of blood clots, which can cause heart attacks or strokes. Women who use Ortho Evra are exposed to about 60 percent more estrogen than pill users.
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