Norethindrone (Standard) is the standard substance of Norethindrone, and it is applicable for quantitative analysis, quality control, and related research in biochemical experiments. Norethindrone (Norethisterone) is a synthetic progestational hormone with actions similar to those of PROGESTERONE but functioning as a more potent inhibitor of ovulation. It has weak estrogenic and androgenic properties. The hormone has been used in treating amenorrhea, functional uterine bleeding, endometriosis, and for contraception.