Efficacy and Safety of EXPAREL Versus Standard of Care (SoC) in Subjects Undergoing Elective Cesarean Section

This is a Phase-4, multicenter, randomized, active-controlled study in approximately 182 adult women undergoing elective C-section. All subjects will remain in the hospital for up to 72 hours post surgery. Subjects will be screened within 30 days prior to surgery. During the screening visit, subjects will be assessed for any past or present medical conditions that in the opinion of the investigator would preclude them from study participation. After the Informed Consent Form (ICF) is signed, a medical history, surgical history, physical examination, 12-lead electrocardiogram (ECG), vital sign measurements, alcohol breath test and urine drug screen, and clinical laboratory tests (hematology and chemistry) will be performed. On Day 1, prior to the C-section, eligible subjects will be randomized in a 1:1:1 ratio into one of the three treatment groups listed below: * Group 1: 150 mcg Duramorph® (SOC arm)+ postoperative multi-modal pain regimen as defined in this protocol. No EXPAREL TAP infiltration following skin-incision closure. * Group 2: 50 mcg Duramorph + EXPAREL TAP infiltration following skin-incision closure + postoperative multi-modal pain regimen as defined in this protocol. * Group 3: EXPAREL TAP infiltration following skin-incision closure + postoperative multi-modal pain regimen as defined in this protocol. No Duramorph. Rescue Medication will be provided, as needed, for all subjects. Subjects will remain in the hospital for up to 72 hours after surgery. Total opioid burden and Pain intensity scores using a 10 cm Visual Analog Scale (VAS) will be collected. Daily pain intensity score (VAS) and all pain medications will be collected through Day 14. A phone call will be made to each subject on Day 14 and Day 30.