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Bismuth subsalicylate
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Bismuth subsalicylate, with a chemical formula C7H5BiO4, is a drug used to treat nausea, heartburn, indigestion, diarrhea, and other temporary discomforts of the stomach and gastrointestinal tract. Commonly known as pink bismuth, it is the active ingredient in popular medications such as Pepto-Bismol and (modern) Kaopectate.
derivative of salicylic acid, bismuth salicylate displays anti-inflammatory action and also acts as an antacid.
e are some adverse effects.

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Encyclopedia
Bismuth subsalicylate, with a chemical formula C7H5BiO4, is a drug used to treat nausea, heartburn, indigestion, diarrhea, and other temporary discomforts of the stomach and gastrointestinal tract. Commonly known as pink bismuth, it is the active ingredient in popular medications such as Pepto-Bismol and (modern) Kaopectate.
Pharmacology
As a derivative of salicylic acid, bismuth salicylate displays anti-inflammatory action and also acts as an antacid.
Adverse effects and contraindications
There are some adverse effects. It can also cause a black tongue and black stools in some users of the drug, when it combines with trace amounts of sulfur in their saliva and gastrointestinal tract. This discoloration is temporary and harmless.
Some of the risks of salicylism can apply to the use of bismuth subsalicylate.
Children should not take medication with bismuth subsalicylate while recovering from influenza or chicken pox, as epidemiologic evidence points to an association between the use of salicylate-containing medications during certain viral infections and the onset of Reye's syndrome. For the same reason, it is typically recommended that nursing mothers not use medication containing bismuth subsalicylate (such as Pepto-Bismol) because small amounts of the medication are excreted in breast milk and pose a theoretical risk of Reye's syndrome to nursing children.
Radioactivity
While bismuth is technically radioactive, its half life is so long, on the order of hundreds of billions of years, that it is safe for all medical and other ordinary purposes.
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