Pepto-Bismol Mechanism Mystery

Scientists still do not know exactly how bismuth subsalicylate, the active ingredient in Pepto-Bismol, relieves nausea, diarrhea, and stomach upset. Researchers think it works through a mix of anti-inflammatory, antibacterial, antacid, and fluid-absorption effects, but no single mechanism fully explains all of its actions. Even its chemistry has been murkier than people might expect, because the drug was long treated as a simple compound even though modern studies describe it as a more complex bismuth-based material.

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