Study of Efficacy of Bowel Preparation Before Colonoscopy

Inclusion Criteria: * Are men or nonpregnant women who are scheduled for an elective colonoscopy and who are at least 18 years of age, * Are, in the opinion of the Investigator, able to communicate with study personnel and comply with the requirements of the study, * Are able and willing to follow the study-specified testing including the diet and hydration regimen, and * Have been informed of the nature and risks of the study and have given written informed consent at Screening and before any study-related tests are done. Exclusion Criteria: * Have any known contraindications to the study procedures or treatment, * Have clinically significant active cardiovascular disease, including a history of myocardial infarction, within the past 6 months and/or heart failure * Have known or suspected electrolyte abnormalities, gastrointestinal obstruction, gastric retention, bowel perforation, toxic colitis, toxic megacolon, or ileus, * Have any history of prior colon surgery, * History of active inflammatory bowel disease, * Have clinical evidence of dehydration, * Are pregnant or breast-feeding, * Are unwilling to abstain from alcohol consumption from the day before colonoscopy until discharged from the study, * Are unwilling to use any prohibited medications, including laxatives, 4 days before receiving the first study dose, * Have received any investigational agent within 30 days before dosing, * Have any known or suspected allergies, sensitivity or an unwillingness to consume components of the study medication, * Known or suspected phenylketonuria (PKU) or sensitivity to products containing phenylalanine, or is on a phenylalanine-reduced diet, * A history of hemolysis or taking concomitant medications known to precipitate hemolytic reactions, * Have any other condition which in the Investigator's opinion would make the subject unsuitable for inclusion into the study.