
A new
study of 1.3 million Danish women over nine years adds to the evidence that
some newer birth-control pills, including the best-seller Yaz, have a higher
risk of causing potentially dangerous blood clots.
Newer
pills containing drospirenone, a synthetic hormone, were linked to a six-fold
increase in the risk of venous thromboembolism, which is the formation of clots
in the lower leg or thigh that can break loose and travel to the lungs.
That
risk was compared with a three-fold increase in women using older
contraceptives containing the synthetic hormone levonorgestrel. The studywas published Tuesday on the Web site
of BMJ, formerly known as the British Medical Journal.
A BMJ
editorial added, “It is crucial, however, not to exaggerate...