RU-486, or Mifepristone, is a chemical method of inducing abortion. It is taken only when a woman is pregnant, up to seven weeks after the beginning of her last menstrual period. 
     The drug works by blocking progesterone, a crucial hormone during pregnancy. Without progesterone, the uterine lining does not provide food, fluid and oxygen to the developing fetus. 
     This procedure requires three visits to the abortion provider. During the first visit a dosage of Mifepristone is taken. Then, two days later, a second drug is taken that stimulates the uterus to contract and expel the fetus. Finally, 12 more days later a follow-up examination is required to ensure the fetus has been expelled.
     Bleeding and cramping are normal occurrences with this procedure. Side effects may include nausea, headache, vomiting, diarrhea, dizziness, fatigue and back pain. Additionally, one out of 100 women require surgical intervention to stop heavy bleeding.