Bile Acid Malabsorption Management

Diagnostic Confirmation

The American Gastroenterological Association recommends considering SeHCAT testing or serum 7α-hydroxy-4-cholesten-3-one (C4) measurement to confirm bile acid malabsorption, as diagnostic testing is preferred over empiric therapy when available 1, 5, 6
Risk factors that should prompt testing include: history of cholecystectomy, terminal ileal disease or resection, abdominal radiotherapy, IBS with diarrhea, functional diarrhea, or nocturnal diarrhea 1, 5, 6
SeHCAT retention <5% indicates severe bile acid malabsorption with expected cholestyramine response rates >70%, while retention 5-15% indicates moderate malabsorption 7

The American College of Gastroenterology recommends starting with cholestyramine 4 g once or twice daily with meals, titrating to 2-12 g/day based on symptom response 1, 2
Titrate dose to 2-12 g/day based on symptom response, using the lowest effective dose to minimize side effects 1, 2
Expect clinical response in approximately 70% of patients overall, with higher response rates (88%) in those with confirmed bile acid malabsorption 4

Consider switching to colesevelam as an alternative bile acid sequestrant with better tolerability 3, 4
Consider loperamide 2-8 mg given 30 minutes before food for additional symptom control 7, 11

Monitor for fat-soluble vitamin deficiencies (A, D, E, K) in patients on long-term cholestyramine, as prolonged use causes malabsorption in 20% of patients 3, 4
Check serum bicarbonate and chloride levels to detect hyperchloremic metabolic acidosis, particularly in patients with renal impairment or volume depletion 3, 4
Maintain treatment at the lowest effective dose and consider a trial of intermittent, on-demand administration rather than continuous therapy 2, 3
Be aware that 39-94% of patients experience recurrent diarrhea when cholestyramine is withdrawn, depending on underlying cause and severity 3, 4