Randomization: The study is a prospective randomized placebo controlled trial. Once patients are consented, an order for the medication will be supplied to the Pharmacy Department. The Pharmacy Department will supply the mediation in a 100 mL bag to be infused over 15 minutes just prior to incision. The Pharmacy will randomly supply these as either a placebo bag of normal saline or the study drug of 1000 mg (1 gram) of intravenous acetaminophen in normal saline. No study personnel from OB/GYN or Anesthesia will have results until the study has been completed. The Pharmacy is responsible for maintaining the blinding of this study