10/26/2011 02:25 pm ET Updated Dec 26, 2011

More Blood Clots Seen With Newer Birth Control Pills

Newer forms of progesterone in combination hormonal contraceptives carry higher venous thromboembolic (VTE) risk than older forms, a population-based study affirmed.

Women on the pill with the older, levonorgestrel version were at three times the risk of VTE as those not on any hormonal contraception, said Ojvind Lidegaard, MD, of Rigshospitalet at the University of Copenhagen, Denmark, and colleagues.

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