Bayer releases two studies it commissioned as proof that the drugs are safe, but other studies have found that contraceptives like Yaz and Yasmin increase the risk of blood clots more than other types of birth control pills.
Yasmin, first marketed in 2001, and Yaz, introduced in 2006, are made with a synthetic progestin called drospirenone. Two 2009 studies published in The British Medical Journal have called drospirenone’s safety into question.
One study, which looked at blood clot risks in healthy Danish women ages 15 to 49, found that of 4,213 cases of various kinds of blood clots reported between 1995 and 2005, more than 2,000 occurred in women who used oral contraceptives. Contraceptive pills made with the synthetic progestins desogestrel, gestodone and drospirenone all had a higher risk of blood clots compared to those made with an older form of progestin called levonorgestrel.
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