WASHINGTON (AP) - Federal health regulators are leaning toward adding new warning labels about the risk of blood clots to packages
of widely prescribed birth control pills such as Yaz, in light of growing evidence suggesting the newer contraceptive drugs are more risky than older drugs.

On Thursday, the Food and Drug Administration will ask outside experts to weigh in on the issue and determine whether some women
should not take the drugs.

Yaz and several other pills contain a manmade hormone called drospirenone (pronouncer: dro-speer'-a-non) which was heavily marketed as carrying fewer side effects than earlier drugs.

But several large, independent studies have suggested the rate of blood clots with drugs with the hormone is slightly higher than with other drugs.

FDA says the evidence is not conclusive, but it should appear in drug labeling.