Postoperative Constipation Management

First-Line Interventions

• The National Comprehensive Cancer Network recommends increasing fluid intake to at least 1.5 L/day, varying beverage temperatures and flavors while avoiding carbonated and sugar-sweetened drinks 2, 3
• The National Comprehensive Cancer Network suggests increasing dietary fiber consumption through fruits, vegetables, and whole grains, but only if adequate fluid intake and physical activity are possible 1, 2
• The National Comprehensive Cancer Network advises discontinuing any non-essential constipating medications that may be contributing to the problem 1, 4

Pharmacological Management

• The National Comprehensive Cancer Network recommends osmotic laxatives, such as polyethylene glycol, lactulose, and sorbitol, as first-line pharmacological options for mild constipation 1
• The National Comprehensive Cancer Network suggests stimulant laxatives, such as bisacodyl and senna, as effective first-line options for mild constipation 1, 4, 5
• The National Comprehensive Cancer Network recommends rectal interventions, such as glycerin suppositories, bisacodyl suppositories, and mineral oil retention enema, if oral medications are ineffective 1
• The National Comprehensive Cancer Network advises considering additional oral options, such as magnesium hydroxide and magnesium citrate, for persistent constipation 1

Opioid-Induced Postoperative Constipation

• The European Society for Medical Oncology recommends prophylactic laxative therapy when opioids are prescribed 6
• The European Society for Medical Oncology advises avoiding bulk-forming laxatives, such as psyllium, for opioid-induced constipation 6
• The National Comprehensive Cancer Network suggests considering methylnaltrexone for opioid-induced constipation that doesn't respond to standard laxatives 1, 5

Special Considerations

• The National Comprehensive Cancer Network recommends ruling out impaction if diarrhea accompanies constipation 1, 4
• The National Comprehensive Cancer Network advises assessing for obstruction using physical exam and abdominal x-ray if indicated 1, 6
• The National Comprehensive Cancer Network suggests evaluating for other causes of constipation, such as hypercalcemia, hypokalemia, hypothyroidism, or diabetes mellitus 1, 4
• The National Comprehensive Cancer Network recommends considering prokinetic agents, such as metoclopramide, if gastroparesis is suspected 1, 5

Monitoring and Follow-up

• The National Comprehensive Cancer Network defines the goal of therapy as one non-forced bowel movement every 1-2 days 1, 4
• The National Comprehensive Cancer Network advises reassessing regularly for treatment effectiveness and potential complications 1