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Why Bayer Will Likely Ignore Studies of Blood Clot Risks in Its Contraceptives

Three new studies showing a higher risk of lethal blood clots or gallbladder disease in women using birth control pills like Yaz put contraceptive maker Bayer (BAYRY) and the FDA on notice: new warnings may need to be added to the product. Whether either of them will actually do anything about it remains an open question.

The studies will hurt Bayer as it faces 6,850 lawsuits alleging that Yaz's drospirenone ingredient is more dangerous than those used in competing pills. About 190 deaths from heart attack, stroke or pulmonary embolism have been associated with Yaz and similar pills.

Two of the studies looked at blood clots; the third looked at gall bladder disease:

Contraceptive makers have historically been slow to act when faced with evidence that their products may be more dangerous than competitors'. Johnson & Johnson (JNJ) settled hundreds of cases alleging its Ortho Evra patch carried a higher risk of blood clots in 2008. About 130 deaths are associated with that product. But the patch is still sold by J&J and an FDA "review" of the product is in its third year.

The FDA does not require companies to wait until it asks for new risk warnings to be added, but it is rare for a company to voluntarily tighten the instructions for its drugs on their own. Doing so is an admission that the company knows there is a problem, and companies don't like making such admissions. Nonetheless, courts have not looked kindly on companies that failed to act after they learned of problems on their products.

It is unlikely that Bayer will do anything to alert doctors to think more carefully before prescribing Yaz and its sister brands (Yasmin, Beyaz, Natazia, Angeliq and Ocella). The company already sponsored guidelines to ob/gyns suggesting the drug is no more risky than others; previous studies have gotten contradictory results; and Yaz is Bayer's second-biggest product by sales.

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