Could a sweet syrup replace the unpleasant colonoscopy prep?
NCT ID NCT07787897
First seen Aug 26, 2026 · Last updated Aug 27, 2026 · Updated 1 time
Summary
This trial tests whether a low-volume lactulose drink can clean the bowel as well as the standard high-volume polyethylene glycol (PEG) solution before a colonoscopy. Adults aged 45 to 75 scheduled for routine outpatient colonoscopy are randomly assigned to take either lactulose mixed with water or the usual PEG solution, following a low-fiber diet. The study compares bowel cleanliness, polyp detection, patient comfort, and side effects like nausea or bloating. The goal is to see if a smaller, sweeter preparation could make colonoscopy screening more acceptable without compromising quality.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- lactulose (a sweet syrup) compared with polyethylene glycol (PEG), a standard bowel-cleansing solution
- What this could lead to
- If lactulose works as well as PEG, it could offer a more tolerable and lower-volume option for colonoscopy preparation, potentially improving patient comfort and willingness to undergo screening.
- What could go wrong
- This is a single-center trial, and lactulose may not clean the bowel as effectively as PEG, which could affect polyp detection. Side effects like bloating or discomfort may still occur.
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Study facts
What this study's own registry entry says, in plain language.
- Phase
-
Not a phased trial
Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.
- Participants
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200 people
The number who actually took part.
- Started
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Jul 2024
- Finished
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Dec 2025
- Lead sponsor
-
Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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45 to 75 years
- Sex
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Anyone
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: Patients scheduled for outpatient colonoscopies for colorectal cancer screening Ages 45 to 75 Informed consent form required Exclusion Criteria: Pregnancy Patients with colon resections and/or ileostomies Allergy to the medications studied Intolerance to the oral route Hepatic cirrhosis Ascites Chronic kidney disease on peritoneal dialysis or hemodialysis, decompensated heart disease (ischemic heart disease, congestive heart failure, unstable angina) Inflammatory bowel disease Inability to understand the instructions for bowel preparation Suspected intestinal obstruction or perforation Patients with lower gastrointestinal bleeding History of colon cancer History of inadequate bowel preparation History of polyps in previous colonoscopies Bow preparation intake \<50%
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As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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National Institute of Medical Sciences and Nutrition Salvador Zubiran
Mexico City, Tlalpan, 14080, Mexico
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