This study will test the efficacy, tolerability, and feasibility of an oral sulfate solution (SUPREP) for inpatient colonoscopy preparation, compared to the standard of care (GoLytely). The hypothesis is that SUPREP will be well tolerated and non-inferior to standard polyethylene glycol bowel preparation for colonoscopies in an inpatient setting. To test this, at least 124 subjects who are undergoing an inpatient colonoscopy will be randomized to receive either SUPREP or standard of care. The Boston Bowel Preparation Score will be collected as standard of care for both groups. Safety will be monitored from standard of care blood tests and ECG (when indicated). Subjects will be given a survey to assess how tolerable they found the procedure.

A non-inferiority design will be used to compare SUPREP to the standard of care polyethylene glycol preparation. Data analysis will be performed on Boston Bowel Preparation Score and rate of failure of preparation (measured as number of successful subsequent colonoscopies).

Inclusion Criteria:

• Patients will be approached with consent for the study only if there is a clinical indication for pursuing an inpatient colonoscopy

Exclusion Criteria:

• Inability to consent (patient or POA)