The purpose of this study is to evaluate the efficacy and safety of sodium phosphate tablets compared to split dose of 4 liters of PEG used in adults for bowel cleansing prior to colonoscopy.

Inclusion Criteria:

• Men and women aged from 18 to 75 years (included).
• Scheduled for a colonoscopy as an outpatient.
• Normal renal function

Exclusion Criteria:

• Having a disease or condition as follows:

  • repeated episodes of nausea and vomiting
  • abdominal pain due to severe infection or requiring surgery
  • clinically significant abnormal electrolytes values
  • congestive heart failure, unstable angina pectoris or recent myocardial infarction, percutaneous transluminal coronary angioplasty (PTCA) or coronary artery bypass surgery within previous 3 months
  • known/suspected bowel obstruction, megacolon, ileus or intestinal perforation, or gastroparesis,
  • inflammatory bowel disease,
  • history of gastric stapling or bypass procedure or gastric retention

• Sodium phosphate preparation taken within the past three weeks prior to colonoscopy.

• Known allergy to any of the active ingredients or excipients of the study drugs.

• History of phenylketonuria