Journal List > Korean J Gastroenterol > v.63(5) > 1007226

Park, Lee, and Yang: The Evolution of Bowel Preparation and New Developments

Abstract

Bowel preparation is essential for successful colonoscopy examination, and the most important factor is the bowel preparation agent used. However, selection of a bowel preparation agent invariably involves compromise. Originally, bowel preparation was performed for radiologic and surgical purposes, when the process involved dietary limitations, cathartics, and enemas, which had many side effects. Development of polyethylene glycol (PEG) solution led to substantive advancement of bowel preparation; however, despite its effectiveness and safety, the large volume involved, and its salty taste and unpleasant odor reduce compliance. Accordingly, modified PEG solutions requiring consumption of lower volumes and sulfate-free solutions were developed. Aqueous sodium phosphate is more effective and better tolerated than PEG solutions; however, fatal complications have occurred due to water and electrolyte shifts. Therefore, aqueous sodium phosphate was withdrawn by the US Food and Drug Administration, and currently, only sodium phosphate tablets remain available. In addition, oral sulfate solution and sodium picosulfate/magnesium citrate are also available, and various studies have reported on adjunctive preparations, such as hyperosmolar or stimulant laxatives, antiemetics, and prokinetics, which are now in various stages of development.

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Table 1.
The US Food and Drug Administration (FDA)-approved Bowel Preparation Agents for Colonoscopy
Bowel preparation agents Characteristics Advantages Disadvantages Cautions
4-Liter PEG Not approved by the FDA for split dosing Safe and effective High-volume, may cause nausea, abdominal fullness, and bloating salty taste and unpleasant smell Contraindicated in patients with ileus, gastrointestinal obstruction, gastric retention, bowel perforation, toxic colitis or toxic megacolon, hypersensitivity to components of it
4-Liter sulfate-free PEG Not approved by the FDA for split dosing Safe and effective Less salty and more tolerable (palatable) High-volume may cause nausea, abdominal fullness, and bloating Same as 4-liter PEG
2-Liter PEG with bisacodyl Not approved by the FDA for split dosing Low-volume Effective and tolerable May cause discomfort, abdominal fullness, cramping, nausea, and vomiting Contraindicated in patients with gastrointestinal obstruction, bowel perforation, toxic colitis and toxic megacolon, gastric retention, ileus Fluid and electrolyte disturbances can lead to serious adverse events such as cardiac arrhythmias, seizures and renal impairment
2-Liter PEG with ascorbic acid Approved by the FDA for split dosing Low-volume Ascorbic acid acts as a flavoring May cause malaise, nausea, vomiting, abdominal pain, dyspepsia Same as 2-liter PEG with bisacodyl
Sodium phosphate tablets Avoid in patient with renal disease, congestive heart failure, or concomitant medications that can affect renal function Low-volume Effective and tolerable May cause bloating, nausea, abdominal pain, and vomiting Contraindicated in patients with acute phosphate nephropathy, gastrointestinal obstruction, gastric bypass or stapling surgery, bowel perforation, toxic colitis and toxic megacolon, allergy to components of it Fluid and electrolyte disturbances can lead to cardiac arrhythmias, seizure, and renal impairment
Oral sulfate solution Approved by the FDA for split dosing Safe and effective May cause discomfort, abdominal distension, abdominal pain, nausea, and vomiting May cause temporary elevation of uric acid Same as 2-liter PEG with bisacodyl
Sodium picosulfate/ magnesium citrate Approved by the FDA for split dosing Low-volume Effective and tolerable (good taste, less nauseating) May cause headache, nausea, proctalgia Contraindicated in patients with allergic to components of it, gastric retention, ulcers, renal impairment, bowel perforation, congestive heart failure, inflammatory bowel disease, hypermagnesemia, gastrointestinal obstruction, ileus, toxic colitis and toxic megacolon

PEG, polyethylene glycol.

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