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Conflicting Study Data Drive FDA Review of Contraceptives Containing Drospirenone
Oral Contraceptives Linked to Increased Venous Thromboembolism Risk
By News Staff
Previous research had yielded conflicting results. Two studies published in BMJ in 2009 also found that drospirenone was associated with an increased risk for VTEs. However, two postmarketing studies required by regulatory agencies, including the FDA, did not report any difference in the risk of blood clots between drospirenone-containing products and products containing other progestins, including levonorgestrel. Current labeling of drospirenone products includes information about those conflicting studies.
The FDA said in a May 31 drug safety communication that the agency is reviewing the two most recent studies and all other available information to assess whether there is a greater risk of VTEs in women who use drospirenone products. Furthermore, findings from an FDA-commissioned study exploring the association of blood clots with use of hormonal contraceptives are being finalized and reviewed. The agency said results of that study, which involved more than 800,000 women, are expected later this summer.
For now, the agency has issued the following information for physicians:
- continue to follow drug label recommendations when prescribing oral contraceptive products that contain drospirenone;
- discuss the known benefits and potential risks of drospirenone products with patients;
- educate patients to recognize the signs and symptoms of blood clots -- including persistent leg pain, severe chest pain or sudden shortness of breath -- and instruct them to contact their physician immediately if they develop these symptoms; and
- report adverse events involving drospirenone-containing oral contraceptives to the FDA's MedWatch program.
In addition to prevention of pregnancy, some contraceptives containing drospirenone are approved to treat symptoms of premenstrual dysphoric disorder or moderate acne, as well as to raise folate levels, in women who choose to use an oral contraceptive for birth control.