Drospirenone 4 mg in a 24 + 4 regimen in women with contraindications to oestrogen use for contraception: bleeding patterns according to previous menstrual characteristics

Purpose A new POP consisting of 4 mg drospirenone (DRSP) for 24 days with a 4-day hormone-free interval was developed to improve bleeding predictability during POP use. The aim of this study was to evaluate the effect on bleeding patterns during use of this oral contraceptive (OC) in comparison with previous menstrual cycles before the start of OC use. Methods This is a pilot, prospective trial. A diary was used to collect information about daily bleeding and pelvic pain before and during treatment. During OC use, women were categorised as having (1) unscheduled bleeding or spotting days (UB), (2) scheduled bleeding or spotting days (SB) and (3) absence of bleeding/spotting (AB). SF-36 and FSFI questionnaires were used to quantify health-related quality of life and the quality of sexual life in sexually active participants. Results Eighteen out of twenty-five (72%) women completed the entire follow-up. Women with UB (44.4%) were older at inclusion (p < 0.001) and had higher BMIs (p = 0.02) than those with AB (22.2%) or SB (33.4%). Women recorded a significant reduction of menstrual flow intensity during OC use (p < 0.0001). Those with UB also experienced a significant reduction of menstrual pain intensity (p = 0.006). Women with SB during OC use had a longer baseline cycle than those who reported UB during OC use (p = 0.008). Satisfaction with this OC was very high (8.4 +/- 2.2 points) with no modification in SF-36 and FSFI values. Conclusion A DRSP-only pill is a good OC option for women with contraindications to oestrogen use. Features of the menstrual cycle before the start of OC use may be used to predict associated changes in bleeding patterns.