According to the label change women using the weekly patch which is the only birth-control patch approved by the FDA is taking in substantially more estrogen than women who take a daily birth-control pill. These pills typically contain 35 micrograms of estrogen. These higher levels of estrogen put some women at increased risk of blood clots.

Dr. Steven R. Goldstein, a professor of obstetrics and gynecology at New York University School of Medicine said, "When the patch came out, I enthusiastically used [it] in women who don't like to take pills. But I thought that there was too much estrogen in it, because four of the women lasted one or two months and complained of symptoms, which are usually attributed to excess estrogen."

He added, "My advice is that for a patient who had been on the patch for any period of time and is doing well, I don't see a need to take her off. With most of the estrogen-related blood clots, the risk is greatest in the first six months of use."


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