45 years old, a lot of menstruation lasts a long time may be related to irregular menstruation, uterine fibroids, etc., you can go to the hospital to do the relevant examination, and then under the guidance of the doctor to use medication, such as the uterine blood Ning capsule, but also diagnostic scraping, surgical treatment. If you are 45 years old, you are generally considered to be in peri-menopause, which may cause irregular menstruation due to hormone level disorders in the body, and the menstruation is heavy and lasts for a long time. In this case, you can use medication to stop bleeding under the guidance of the doctor, such as uterine hematin capsule, and if the effect of medication is not obvious, you can carry out diagnostic scraping to stop the bleeding. Uterine fibroids may also cause heavy menstruation lasting for a long time, because uterine fibroids will make the uterine cavity larger, the endometrial area will increase accordingly, thus causing heavy menstruation lasting for a long time, you can also use uterine hemosiderin capsule under the guidance of the doctor to stop bleeding treatment, if the uterine fibroids are relatively large, you can surgically remove the fibroids. It is recommended to go to the hospital in time to do examination, and then under the guidance of the doctor treatment, so as not to delay the condition.