Polyethylene glycol (PEG) bowel-prep kits for colonoscopy can require drinking up to 4 liters of liquid, while oral sodium phosphate kits typically require about 3 liters.
Notes on verification
Multiple independent medical sources (Yale Medicine, UChicago Medicine, ACG) corroborate the volume figures for PEG and sodium phosphate bowel prep regimens, consistent with patient-education materials. [tier=unverified indep_score=0.3 clusters=3 claim_tier=notable] [rescored 2026-09-15: curated origin-host map (PR #65); unclassified hosts no longer scored as aggregators]
Sources
- How to Prepare for a Colonoscopy (seed:health_and_medicine)
- https://www.yalemedicine.org/news/colonoscopy-prep-options (corroboration)
- https://gi.org/journals-publications/ebgi/a-new-pill-prep-for-colonoscopy/ (corroboration)
- https://www.uchicagomedicine.org/cancer/types-treatments/colorectal-cancer/screening-diagnosis/colonoscopy (corroboration)