Soluble Fiber (Psyllium, Ispaghula Husk)
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How it works:
Poorly fermented, soluble, gel-forming fiber softens stool and increases fecal biomass, which could benefit bowel symptoms in patients with IBS-C or chronic constipation.
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Which symptoms does it help: Stool frequency, stool consistency, and straining are most likely to improve.
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How long it takes to see a benefit:
Varies from days to weeks.
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FDA approved:
Over the counter (no prescription needed).
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Dosage:
Dose titration typically required. Start at a low dose and slowly increase over days to weeks.
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Special considerations or risks:
N/A
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Most common side effects:
Bloating, distention, flatulence, cramping.
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Recommendation:
ACG recommends psyllium, but not wheat bran, for overall symptom improvement in IBS patients.
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