Study to Evaluate Menses Induction in Women Administered Proellex

The purpose of this study is to determine the oral dose level at which the investigative drug, Proellex, is able to suppress endogenous progesterone in women. It is believed that giving Proellex in the early/mid-luteal phase of the cycle will suppress the effects of endogenous progesterone triggering the end of the cycle and inducing menstruation as happens naturally