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Are there any birth control pills that pose a greater risk of blood clots?
Birth control pills with only progestin (a progesterone-like hormone) do not increase the risk of blood clots.
Birth control pills with the estrogen ethinyl estradiol (most birth control pills) increase the risk of blood clots in both arteries and veins. Birth control pills with the estrogen estradiol increase the risk of blood clots in veins. Birth control pills with only progestin (a hormone similar to progesterone) do not increase the risk of blood clots.
