Concern has been raised that the risk of venous thromboembolism (VTE) in users of the ORTHO EVRA patch is higher compared to users of oral contraceptives (OCs).
Postmarketing study of ORTHO EVRA and levonorgestrel oral contraceptives containing hormonal contraceptives with 30 mcg of ethinyl estradiol in relation to nonfatal venous thromboembolism.
Boston Collaborative Drug Surveillance Program, Department of Epidemiology, Boston University School of Medicine, 11 Muzzey Street, Lexington, MA 02421, USA. sjick@bu.edu
