Additional Study Information: When women have a cesarean delivery, there is an amount of bleeding. Occasionally (in less than 5 of every 100 births) there is severe bleeding that can place the mothers health at risk. When there is too much bleeding after a cesarean delivery, women are given medicines, blood transfusions, or possibly need another surgery. Tranexamic acid is routinely used to lessen the chance of hemorrhage. It works by making your blood clot sooner. It is not routinely used for cesarean sections. We are doing this study to see if this drug also works for women who are having a cesarean section. The study starts when you are having your cesarean section and continues until 6 weeks post-partum with follow-up phone calls. You will receive a telephone call one week after your delivery, and another call at 6 weeks after your delivery. The total compensation for participation in the study is $50.