- Post-menopausal defined as females 60 years of age or older or In females <60 years of age, 12 months of spontaneous amenorrhea (In questionable cases, a blood sample with simultaneous follicle stimulating hormone [FSH] and estradiol levels consistent with menopause is confirmatory [the reference values are provided separately]). Females on hormone replacement therapy (HRT) and whose menopausal status is in doubt will be required to use one of the highly effective contraception methods if they wish to continue their HRT during the study. Otherwise, they must discontinue HRT to allow confirmation of post-menopausal status prior to study enrollment.