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Antacid
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<p>An antacid is a substance which <a href="/facts/Neutralization_(chemistry)/WC1c5fj1">neutralizes</a> <a href="/facts/Gastric_acid/btVCyhYH">stomach acidity</a> and is used to relieve <a href="/facts/Heartburn/MkNPKoxS">heartburn</a>, <a href="/facts/Indigestion/axnCu0gn">indigestion</a>, or an upset stomach. Some antacids have been used in the treatment of <a href="/facts/Constipation/l4DHHM6L">constipation</a> and <a href="/facts/Diarrhea/6TBHaRdA">diarrhea</a>. Marketed antacids contain <a href="/facts/Salt_(chemistry)/lsSKwGpn">salts</a> of <a href="/facts/Aluminum/7wmR8jYE">aluminum</a>, <a href="/facts/Calcium/hf252CC0">calcium</a>, <a href="/facts/Magnesium/XyIhd2FG">magnesium</a>, or <a href="/facts/Sodium/eYuSPu2V">sodium</a>. Some preparations contain a combination of two <a href="/facts/Salt_(chemistry)/lsSKwGpn">salts</a>, such as <a href="/facts/Magnesium_carbonate/ymvhw5R8">magnesium carbonate</a> and <a href="/facts/Aluminum_hydroxide/e0pXvDGr">aluminum hydroxide</a> (e.g., <a href="/facts/Hydrotalcite/5q2x88zy">hydrotalcite</a>). </p>