Progesterone should not be taken all the time. Progesterone is a progesterone-like drug that promotes the growth of endometrial glands and also thickens the thickness of the endometrium. In the early stages of pregnancy, if there are conditions such as habitual miscarriage or preeclampsia, they can be treated with progesterone injections. Besides, if there is a delay in menstruation, progesterone can also be used to regulate it. However, if you inject progesterone for a long period of time, there will be side effects, mainly redness, swelling and hardness at the injection site, or even aseptic abscesses. Those who are allergic to progesterone and its constituent parts, as well as those who have abnormal liver function, smokers, and those who have family history of thrombosis should not use the medicine. Regardless of whether progesterone is used as a drug to protect the fetus or as a drug to regulate menstruation can not be hit for a long time, you can consider oral progesterone preparations.