antacid

antacid /ant·ac·id/ (ant-as´id) counteracting acidity; an agent that so acts.

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ant·ac·id (nt-sd) or an·ti·ac·id (nt-sd, nt-)

adj.

Counteracting or neutralizing acidity, especially of the stomach.

n.

A substance, such as sodium bicarbonate, that neutralizes acid.

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Antacid

A substance that counteracts or neutralizes acidity, usually of the stomach. Antacids have a rapid onset of action compared to histamine H-2 receptor blockers and proton pump inhibitors, but they have a short duration of action and require frequent dosing.

Mentioned in: Proton Pump Inhibitors

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antacid

[antas′id]

Etymology: Gk, anti, against, acidus, sour

1 opposing acidity.

2 a drug or dietary substance that buffers, neutralizes, or absorbs hydrochloric acid in the stomach. Nonsystemic antacids containing aluminum and calcium are constipating; those containing magnesium have a laxative effect. Systemic antacids such as sodium bicarbonate are rarely used.

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antacid,

n a substance that can counteract or neutralize acidity in the stomach.

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antacid

1. counteracting acidity.

2. an agent that counteracts acidity. Substances that act as antacids include sodium bicarbonate, aluminum hydroxide gel, magnesium hydroxide, magnesium trisilicate, magnesium oxide and calcium carbonate. They are often used in humans in the treatment of peptic ulcer.

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antacid

Pharmacology A basic agent that neutralizes acid in the gastric lumen; the final pH achieved is usually a function of the amount of antacid administered GI effects Antipeptic, ↑ in acid secretion, ↑ GI motility, ↑ mucus secretion; antacids vary in absorption–eg, NaHCO₃ and sodium citrate and are completely absorbed, which may result in metabolic acidosis