Multicenter, Open-label, Randomized Study to Evaluate Inhibition of Ovulation During Treatment With Three Transdermal Patch Formulations Containing 0.55 mg Ethinylestradiol (EE) and 2.10 mg Gestodene (GSD) or 0.35 mg EE and 0.67 mg GSD or 0.275 mg EE and 1.05 mg GSD in Healthy Young Female Volunteers Over a Period of 3 Treatment Cycles

The primary objective of this trial is to examine whether ovulation is suppressed after use of hormone patches containing different dosages of ethinyl estradiol (EE) and gestodene (GSD) for 3 treatment cycles. To this end, the blood levels of endogenous hormones (hormones produced by your body) will be measured and transvaginal ultrasound examinations will be conducted at regular intervals. In addition, the concentrations of the administered hormones EE and GSD in blood will be determined in regular intervals.

With regard to the tolerability of the hormone patches subjects will be asked regularly how they feel and blood pressure, pulse and body weight will be determined. In addition, blood and urine safety examinations will be conducted at defined timepoints.