The blood of the medicine flow more than half a month may be caused by the side effects of the medicine flow, incomplete medicine flow and other reasons. 1. Side effects of medication abortion: medication abortion refers to the way of terminating early pregnancy ≤ 49 days by taking medication under the guidance of a doctor. The main side effect of medication abortion is long vaginal bleeding, bleeding, a few women may last about half a month, through the ultrasound examination to exclude the uterine cavity residue and bleeding is not much, can be temporarily observed. 2. Incomplete abortion: medication abortion is prone to incomplete abortion, uterine cavity residue, and so on, which leads to vaginal bleeding for a long time, ultrasound can be a clear diagnosis, you need to be under the guidance of the doctor in a timely manner for the treatment, can be taken orally to promote the discharge of motherswort granules, the residue of a large amount of time, you can also be cleared treatment. When the bleeding after medical abortion exceeds half a month, you need to go to the hospital to find out the cause and actively treat it.