What it means
A basic (alkaline) compound that reacts with stomach acid. Common ones are calcium carbonate (Tums), magnesium hydroxide (milk of magnesia) and aluminum hydroxide, often mixed (Maalox, Mylanta). They work quickly but briefly. Magnesium tends to cause diarrhea and aluminum and calcium constipation, which is why they are often combined.
For the nurse
Antacids block the absorption of many other drugs, such as some antibiotics, iron and digoxin, so give them at least 1 to 2 hours apart. Use magnesium and aluminum antacids carefully in kidney failure.
At a glance
| Drug class | antacid |
|---|---|
| Brand names | Tums, Maalox, Mylanta, Gaviscon |
| Spanish | antiácido |
| Also written | antacids |
Related terms
ulcer
An open sore where the skin or the lining of an organ has broken down.
gastroesophageal reflux disease
A long-term condition in which stomach contents, including acid, flow back up into the esophagus.
reflux
A backward flow of fluid, most often of stomach contents up into the esophagus.