 This study was designed to assess the safety and efficacy of AQUAVAN Injection in providing adequate sedation in patients undergoing colonoscopy. Prior to the procedure, patients received fentanyl citrate for pain management followed five minutes later by AQUAVAN Injection for sedation. Throughout the procedure, study personnel assessed the patients vital signs and depth of sedation. After the procedure, the patient, physician, and an evaluator were asked to complete satisfaction surveys. 