Review: contraceptive patch and vaginal ring are as effective as oral contraceptives
Dr L Lopez, Family Health International, Research Triangle Park, NC, USA; email@example.com
How do the contraceptive skin patch and vaginal ring compare with combination oral contraceptives (COCs) for contraceptive effectiveness, cycle control, and side effects?
Studies selected compared the contraceptive skin patch (norelgestromin, 150 µg, plus ethinyl estradiol, 20 µg daily; patch changed weekly for 3 wks, then 1 patch-free wk) or contraceptive vaginal ring (etonogestrel, 120 µg, plus ethinyl estradiol, 15 µg daily, kept in place for 3 wks, then 1 ring-free wk; or nestorone, 150 µg, plus ethinyl estradiol, 15 µg daily, kept in place for 1 y) with any COC for ⩾3 menstrual cycles in women of reproductive age (18–45 y) with regular menstrual cycles. Outcomes …