What is pepto bismol

Last updated: April 1, 2026

Quick Answer: Pepto-Bismol is an over-the-counter antidiarrheal medication containing bismuth subsalicylate as its active ingredient, used to relieve indigestion, heartburn, nausea, and diarrhea.

Key Facts

The active ingredient in Pepto-Bismol is bismuth subsalicylate, which works as an antidiarrheal and antimicrobial agent
Pepto-Bismol is available in multiple forms including liquid, tablets, and chewables, with the liquid form typically colored pink
The medication works by reducing inflammation in the digestive tract and killing certain bacteria and viruses
Pepto-Bismol has been used as an over-the-counter remedy since 1901 and remains widely available
The medication should not be used by people with salicylate sensitivity or certain medical conditions without consulting a healthcare provider

What is Pepto-Bismol?

Pepto-Bismol is a widely available over-the-counter medication used to treat various digestive complaints including diarrhea, indigestion, heartburn, nausea, and upset stomach. The brand name product contains bismuth subsalicylate as its primary active ingredient. Since its introduction in 1901, Pepto-Bismol has become one of the most recognizable gastrointestinal remedies in North America, known particularly for its distinctive pink color.

How Pepto-Bismol Works

Bismuth subsalicylate, the active ingredient, works through multiple mechanisms to relieve gastrointestinal symptoms. It acts as an anti-inflammatory agent, reducing swelling and irritation in the digestive tract. Additionally, it has antimicrobial properties, helping to suppress certain bacteria and viruses that may cause diarrhea or other digestive issues. The salicylate component also helps reduce inflammation similar to aspirin, though it works specifically in the digestive system.

Forms and Dosing

Pepto-Bismol is available in several convenient forms to suit different preferences:

Liquid suspension: The original form, taken by the spoonful, known for its pink color
Tablets: Convenient for portability and those who prefer not to take liquids
Chewables: A tablet form designed to be chewed rather than swallowed whole
Caplets: Easy-to-swallow capsule form

Safety and Precautions

While Pepto-Bismol is available without a prescription, it is not appropriate for everyone. People who are sensitive to salicylates (a compound found in the medication) should avoid it, particularly those with aspirin allergies. Additionally, individuals with certain medical conditions, those taking specific medications, or pregnant or nursing women should consult a healthcare provider before using Pepto-Bismol. It can cause temporary darkening of the stool and tongue, which is harmless but may be concerning if not expected. Long-term use should be discussed with a healthcare provider.

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