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  • Title: Risk of venous thromboembolism with drospirenone-containing oral contraceptives.
    Author: Brown DA, Vartan CM.
    Journal: Am J Health Syst Pharm; 2011 Jun 01; 68(11):1003-10. PubMed ID: 21593228.
    Abstract:
    PURPOSE: The risk of venous thromboembolism (VTE) with drospirenone-containing oral contraceptives (OCs) is reviewed. SUMMARY: Increasing attention and media have raised awareness and concern about whether drospirenone-containing OCs increase the risk of VTE. Two studies found that when compared with nonuse of OCs, use of drospirenone-containing OCs was associated with a fourfold to over sixfold increased risk of having a thrombotic event. One of these studies found an increased risk associated with short-term use of drospirenone-containing OCs; however, this study was limited by the small number of participants taking drospirenone despite the large number of study participants. The cohort study that found a higher rate of VTE among drospirenone users was only able to indicate an association between drospirenone use and VTE, not a cause-and-effect relationship. Three studies concluded that drospirenone-containing OCs did not appear to cause an increased risk of VTE. The hemostatic studies found no difference in the various variables assessed between drospirenone- and desogestrel-containing OCs or between cyclic and continuous administration of drospirenone-containing OCs. These results should be interpreted cautiously, as each study had limitations, such as not controlling for confounders (e.g., recent surgery, immobility, obesity), not providing p values to assess homogeneity between treatment groups, and not providing total numbers of participants or specific types of OCs. Patients who receive drospirenone-containing OCs should be educated regarding the signs and symptoms of VTE, along with an appropriate action plan. CONCLUSION: The majority of available data does not support the conclusion that drospirenone-containing OCs pose an increased risk of VTE compared with other OCs.
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