Constipation Management

Introduction to Constipation Management

• Constipation management involves a combination of lifestyle modifications, dietary changes, and pharmacological interventions, as recommended by the American Gastroenterological Association and the European Society of Gastroenterology 1, 2, 3

Assessment and Evaluation

• Patients should be evaluated for constipation with questions to determine possible causes, and physical examination should include abdominal examination, perineal inspection, and digital rectal examination (DRE) to assess for fecal impaction, as recommended by the American Society of Clinical Oncology 4
• Investigations are not routinely necessary unless there are concerning features such as severe symptoms, sudden changes in bowel movements, blood in stool, or older adults with health concerns, and plain abdominal X-ray may be useful to assess fecal loading and exclude bowel obstruction, as recommended by 4
• Consider checking calcium levels and thyroid function if clinically suspected, to rule out underlying conditions that may be contributing to constipation, as recommended by 4

Non-Pharmacological Interventions

• Ensure adequate fluid intake, as recommended by 5, 4
• Dietary assessment is important to determine total fiber intake from diet and supplements, and increase physical activity and mobility within patient limits, to help manage constipation, as recommended by 5, 4
• Ensure privacy and comfort for defecation, optimize positioning (using a small footstool to assist gravity), and consider abdominal massage to help reduce gastrointestinal symptoms, particularly in patients with neurogenic problems, as recommended by 4

Pharmacological Interventions

• Osmotic laxatives like PEG 3350 are considered first-line therapy for constipation and IBS-C, with moderate certainty of evidence, as recommended by the American Gastroenterological Association and the European Society of Gastroenterology 1, 2, 3
• PEG may be used in combination with fiber supplements, and alternative osmotic laxatives include lactulose and magnesium salts, although use cautiously in renal impairment due to risk of hypermagnesemia, as recommended by the American Gastroenterological Association 5, 4
• Stimulant laxatives like senna, bisacodyl, or sodium picosulfate may be considered when osmotic laxatives are insufficient, and prucalopride is recommended for chronic idiopathic constipation (CIC) not responding to over-the-counter agents, with a recommended initial dose of 2mg daily, as recommended by the American Gastroenterological Association 5, 4
• The following table summarizes the recommended dosages and usage of PEG:

Opioid-Induced Constipation

• The National Comprehensive Cancer Network recommends PEG 3350 as part of a prophylactic bowel regimen for opioid-induced constipation 6
• For opioid-induced constipation, a stimulant laxative may be added if PEG alone is insufficient, as recommended by the National Comprehensive Cancer Network 6
• Unless contraindicated by pre-existing diarrhea, all patients receiving opioid analgesics should be prescribed a concomitant laxative, with osmotic or stimulant laxatives generally preferred, as recommended by the American Society of Clinical Oncology 4
• Bulk laxatives such as psyllium are not recommended for opioid-induced constipation (OIC), and suppositories and enemas are preferred first-line therapy when DRE identifies a full rectum or fecal impaction, although enemas are contraindicated in patients with certain conditions, including neutropenia, thrombocytopenia, paralytic ileus, or intestinal obstruction, as recommended by 4

Monitoring and Follow-up

• Monitor patients for frequency and consistency of bowel movements, relief of constipation symptoms, and side effects, as recommended by the American Gastroenterological Association 5
• Referral is recommended for patients over 45 years with atypical symptoms, short history, or persistent symptoms despite treatment, as suggested by the British Society of Gastroenterology 7
• Patients with altered bowel habits who respond well to PEG and laxative treatment do not require specialist referral, suggesting functional constipation rather than organic pathology, according to the American Gastroenterological Association and the British Society of Gastroenterology 1, 7