After a medical abortion, it is considered successful if the medication is able to completely expel the embryonic tissue as well as the meconium tissue from the uterine cavity. A woman taking medication to terminate a pregnancy usually takes mifepristone tablets for the first two days to kill the embryo and misoprostol tablets on the third day to promote uterine contractions and help expel the embryonic tissue. If the embryonic tissue can be completely expelled, the duration of post-operative vaginal bleeding will generally be relatively shorter and the woman’s body will recover more quickly. However, if the woman is not sensitive to the medication, if she does not expel the fetus after taking the medication, if she has an incomplete abortion or if she has heavy vaginal bleeding, she will need to undergo an immediate evacuation procedure to help expel the fetus on one hand and to stop the bleeding on the other.