Causes of women not menstruating are different, the effect of taking progesterone will vary from person to person. If a woman’s menstrual cycle is pushed back due to a change in environmental factors, or late-night stress, etc., when not menstruating, only take progesterone capsules for about 3-5 days, stop taking the drug will come to menstruation, and its effect is particularly good. If due to pregnancy and not menstruation, this time to take progesterone does not have any effect, will play a role in preserving the fetus, simply will not appear to menstruation after stopping the performance. If the absence of menstruation is due to hyperprolactinemia, the effect of progesterone is not obvious, and bromocriptine needs to be taken to reduce prolactin before menstruation can resume.