Antacid

An antacid is a substance that neutralizes stomach acidity and is used to relieve heartburn, indigestion, or an upset stomach. Some antacids have been used in the treatment of constipation and diarrhea. Marketed antacids contain salts of aluminum, calcium, magnesium, or sodium. Some preparations contain a combination of two salts, such as magnesium carbonate and aluminum hydroxide (e.g., hydrotalcite).

This article is about the medication used to relieve heartburn. For the acid produced by ants, known in many languages as "ant acid", see Formic acid.

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