Progesterone has similar effects to those of the tablets. For example, the tablets have the effect of reducing fetus, and progesterone also inhibits the contraction of the smooth muscle of the uterus to reduce fetus. Progesterone can also be used to treat irregular bleeding in the second half of the menstrual cycle or early menstrual cycle due to luteal insufficiency. Both of them will thicken the endometrium after eating, and after stopping the medication, the endometrium will experience withdrawal bleeding and menstruation, so the efficacy of both is basically the same and can be replaced.