Comparison of 2L NRL994 With NaP Preparation in Colon Cleansing Prior to Colonoscopies for Colon Tumor Screening

Inclusion Criteria: 1. The subject's written informed consent had to be obtained prior to inclusion. 2. Male or female ambulatory subjects with an age of 18 to 85 years planned to undergo a complete colonoscopy for colon cancer screening 3. Willing, able and competent to complete the entire procedure and to comply with study instructions 4. Females of childbearing potential had to employ an adequate method of contraception Exclusion Criteria: 1. Ileus 2. Intestinal obstruction or perforation 3. Toxic megacolon 4. History of colonic resection 5. Requirement for permanent medication and associated stable serum concentrations (e.g. neuroleptic drugs) 6. Congestive heart failure (NYHA III + IV) 7. Acute life threatening cardiovascular disease 8. Untreated or uncontrolled arterial hypertension (max. \> 170 mmHg and min \> 100 mmHg) 9. Known moderate to severe renal insufficiency 10. Severe renal failure 11. Severe liver failure 12. Known glucose 6 phosphatase dehydrogenase deficiency 13. Known phenylketonuria 14. Known hypersensitivity to polyethylene glycols, NaP and/or Vitamin C 15. Concurrent participation in an investigational drug study or participation within 30 days of study entry 16. Females who were pregnant, nursing or planning a pregnancy. Females of child bearing potential not using reliable methods of contraception 17. Subject had a condition or was in a situation, which in the investigators opinion might have put the subject at significant risk, might confound the study results, or might interfere significantly.