Which therapy is used for both diagnosis and treatment of bile acid diarrhea (BAD)?

Which therapy is used for both diagnosis and treatment of bile acid diarrhea (BAD)?

• A. Loperamide
• B. Fiber supplementation
• C. Cholestyramine
• D. Proton pump inhibitor

Answer: (C)

Bile acid diarrhea occurs when excess bile acids spill into the colon, triggering secretion and increased motility that cause loose stools. The most targeted approach is a bile acid sequestrant, which binds bile acids in the intestinal lumen and prevents them from irritating the colon. Cholestyramine is a classic example of this class, and it works by forming insoluble complexes with bile acids that are then excreted in stool, thereby reducing the amount of bile acids reaching the colon. Cholestyramine can be used not only to treat BAD but also as a diagnostic tool in settings where specific testing for bile acid malabsorption isn’t available. If a patient’s diarrhea improves with a cholestyramine trial, this supports BAD as the cause of symptoms. Other options don’t address the underlying mechanism: loperamide is just an anti-diarrheal that slows movement but doesn’t reduce bile acids; fiber may help somewhat but isn’t specific therapy for BAD nor diagnostic; a proton pump inhibitor targets stomach acid and has no role in bile acid handling.

Bile acid diarrhea occurs when excess bile acids spill into the colon, triggering secretion and increased motility that cause loose stools. The most targeted approach is a bile acid sequestrant, which binds bile acids in the intestinal lumen and prevents them from irritating the colon. Cholestyramine is a classic example of this class, and it works by forming insoluble complexes with bile acids that are then excreted in stool, thereby reducing the amount of bile acids reaching the colon.

Cholestyramine can be used not only to treat BAD but also as a diagnostic tool in settings where specific testing for bile acid malabsorption isn’t available. If a patient’s diarrhea improves with a cholestyramine trial, this supports BAD as the cause of symptoms. Other options don’t address the underlying mechanism: loperamide is just an anti-diarrheal that slows movement but doesn’t reduce bile acids; fiber may help somewhat but isn’t specific therapy for BAD nor diagnostic; a proton pump inhibitor targets stomach acid and has no role in bile acid handling.