Natazia (estradiol valerate and estradiol valerate/dienogest), a fourth generation oral contraceptive made by pharmaceutical giant Bayer HealthCare Pharmaceuticals, Inc, was FDA-approved on March 15, 2012, for the treatment of heavy menstrual bleeding.
In February 2012, the FDA gave Natazia a Black Box Warning regarding “Thromboembolic Disorders and Other Vascular Problems.” The warning states:
“Data from a large, prospective cohort safety study of various COCs (combined oral contraceptives) suggest that this increased risk, as compared to that in non-COC users, is greatest during the first 6 months of COC use. Data from this safety study indicate that the greatest risk of VTE is present after initially starting a COC or restarting (following a 4 week or greater pill-free interval) the same or a different COC.”