The decision to take medication for a missed period should be based on the cause. If it is pregnancy and normal menopause, no medication is needed. If it is caused by polycystic ovary syndrome, endometrial adhesion, hyperprolactinoma and other illnesses, commonly used medications include progesterone drugs and so on. 1. The absence of menstruation due to pregnancy or menopause is a normal physiological phenomenon and does not require treatment. 2. Polycystic ovary syndrome (PCOS) is a relatively common gynecological disease in women, which may cause an increase in androgens in the body, leading to scanty menstruation or even amenorrhea. It may also lead to infertility. Commonly used drugs include dydrogesterone, ethinyl estradiol cyproterone, letrozole and so on. 3. Endometrial adhesion or cervical adhesion may lead to menstrual blood stagnation in the uterine cavity to form a blood clot and can not be discharged, the general drug treatment is ineffective, the need to take surgical separation treatment. 4. Hyperprolactinoma can lead to hypogonadism and amenorrhea. The medication is usually bromocriptine tablets, ergometrine and so on. If you don’t have menstruation, you must find the cause and treat it, and the use of medicines should be under the guidance of doctor, don’t use medicines privately, so as to avoid delaying the condition.