the plasma levels of oestradiol ( e2 ) , oestrone ( e1 ) , and norethisterone were studied in 6 post-menopausal women over a period of 24 h following the ingestion of a single , combined tablet containing 2 mg 17 beta-oestradiol , 1 mg oestradiol and 1 mg norethisterone acetate .
C0028356
norethisterone
C0068980
norethisterone acetate