Comparison of 1L PEG plus ascorbic acid with Linaclotide versus Sennoside for colon cleaning in constipated patients: a single blind, randomized controlled clinical trial

INTERVENTION: We use 0.5 mg of Linaclotide as an adjuvant for bowel preparation on the day prior to the procedure We use 24 mg of Sennoside as an adjuvant for bowel preparation on the day prior to the procedure CONDITION: Constipated outpatients who were scheduled colonoscopy PRIMARY OUTCOME: Achievement of preparation adequacy and an overall colon cleansing score of 6 or more using Boston bowel preparation scale. SECONDARY OUTCOME: Boston bowel preparation scale score; Side effects or complications; Quality of sleep; Willingness to repeat the procedure INCLUSION CRITERIA: