If delayed menstruation is clinically induced by oral progesterone, the following effects may occur. The first is due to delayed menstruation coupled with oral progesterone, progesterone and belong to the progesterone, after taking will make the endometrium thickening phenomenon. Therefore, it will lead to a possible increase in menstrual flow when menstruation occurs, and there is no need to be nervous clinically. The second is that progesterone gel pills can cause dizziness about 1 hour after taking them. So it is recommended that women who take oral progesterone pills to induce menstruation must take it orally before going to bed so as to avoid the occurrence of dizziness. These are the effects of delayed menstruation oral progesterone, it is recommended to follow the doctor’s instructions to give oral. In addition, if the patient is allergic to progesterone is not allowed to take progesterone to promote menstruation, so as not to cause serious consequences.