The efficacy and acceptability of a low-dose levonorgestrel intravaginal ring for contraception in a UK cohort

The efficacy and acceptability of a levonorgestrel-releasing intravaginal ring (IVR) for contraception was assessed in a British cohort studied as part of a multicentre, multinational clinical trial performed under the auspices of the World Health Organisation. One-hundred-and-fifty women took part in the study in two UK centres and completed 1417.5 months of method use. Fifty-nine women discontinued use of the IVR before the end of one year giving an overall discontinuation rate of 39.9 per 100 woman-years. The discontinuation for pregnancy with the ring in situ, was 3.0 per 100 woman-years (life table analysis). Menstrual disturbance, vaginal problems and involuntary expulsion resulted in discontinuation rates of 8.9, 8.4 and 1.6 per 100 woman-years, respectively. This method is an acceptable and effective method of contraception for women.