This is a multicenter, single-dose study in children 12 to <17 years of age, 6 to <12 years of age, 2 to <6 years of age who are scheduled for elective open inguinal hernia repair. Within 21 days of surgery, eligible subjects will be screened and have routine clinical laboratory testing and an electrocardiogram performed. Subjects will then undergo an open inguinal hernia repair under general anesthesia according to the investigator's standard surgical practice on Day 1. Enrollment in this study will start with the oldest age group (12 to <17 years) and will continue in a step-wise fashion until appropriate doses are established for all 3 pediatric age groups. Within each age group, the study will be conducted in 3 parts.