Constipation Management in Adults
Efficacy and Mechanism of Action
- Psyllium is a soluble fiber that increases stool weight and has prebiotic potential, which helps promote normal bowel function 1
- Clinical studies show psyllium may increase spontaneous bowel movements (SBMs) per week (mean difference 2.32, CI 0.86–3.79) compared to placebo 2
- Psyllium has been shown to improve global relief symptoms (RR 1.86, CI 1.49–2.30) in constipated patients 2
Recommended Usage
- For occasional constipation, psyllium (Metamucil) should be taken with adequate fluid (8-10 ounces per dose) 3
- Dosing typically ranges from 5-10g daily, divided into 1-3 doses 2
Treatment Algorithm for Constipation
- The American Gastroenterological Association recommends a first-line approach for mild constipation with a trial of psyllium fiber supplement, particularly for individuals with low dietary fiber intake 4
- Ensure adequate fluid intake with each dose 3
- For persistent constipation, consider adding stimulant laxatives (e.g., bisacodyl) or osmotic laxatives (e.g., lactulose) 3
Important Cautions and Contraindications
- Psyllium is not recommended for opioid-induced constipation, where it may worsen symptoms 7, 8, 5, 9, 10, 6
- For opioid-induced constipation, stimulant laxatives or polyethylene glycol are preferred first-line options 7, 10
- Common side effects include flatulence, which occurs more frequently with psyllium than with some other treatments 2