Medical research has demonstrated that newer birth control formulations containing a synthetic new progestin, Drospirenone, are more likely to cause venous thromboembolism (VTE) blood clots than older drugs. This data has lead the Food and Drug Administration (FDA) to consider new safety measures in meetings later this week. The increased risk is significant because VTE can cause heart attacks, strokes and blockages in lungs, (pulmonary embolism PE) or blood vessels, (deep vein thrombosis DVT) which can be deadly.
Yaz, Yasmin (manufactured by Bayer) and generic versions of the drugs use drospirenone which appears to reduce side effects found in older drugs, including bloating and mood swings. Evaluating the VTE risk of birth control drugs is difficult because all hormone-based contraceptive drugs increase the risk of VTE. Furthermore VTE risk can be increased by smoking, obesity or family history (genetic blood clotting defects).
Yaz, Yasmin and other generic pills containing drospirenone are the focus of a FDA discussion this week. Bayer says its studies have shown no difference in VTE risk between its drospirenone drugs and the older birth control drugs. But several large, independent studies suggest the risk with Yaz and similar medications is slightly higher. The latest analysis by the FDA estimates the risk of VTE with drospirenone-containing pills is 1.5-fold higher than other hormone-based contraceptives.
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