The Impact of GLP Medication on Colonoscopy Bowel Preparation Quality

Inclusion Criteria: * Adult patient (Age 18 years or older) * Patient scheduled for outpatient screening, surveillance, or diagnostic colonoscopy * Using a GLP-1 or GIP agonist at a stable dose for at least one month Exclusion Criteria: * Unable to provide informed consent, e.g., dementia * Patient refuses the USMSTF recommended bowel cleansing regimen for patients with diabetes or obesity (split-dose 4 liters polyethylene glycol + 15 mg bisacodyl the afternoon before; low residue diet 3 days before colonoscopy; clear liquid diet the day before colonoscopy) * Risk factors for inadequate bowel preparation besides diabetes and obesity with a likelihood ratio of 1.6 or greater: 1. Cirrhosis 2. Parkinson's disease 3. Dementia 4. Tricyclic antidepressant use 5. Opioid use 6. Gastroparesis\* or suspected gastric outlet obstruction on pre-procedure imaging (\*defined based on a documented 4-hour solid phase gastric emptying study or prior history of retained gastric contents during upper endoscopy) 7. Previous colorectal surgery 8. Prior history of inadequate bowel preparation