An antacid is a compound that absorbs and neutralizes stomach acid. The use of antacids has declined because of the availability of many very potent drugs that are more effective and much less troublesome to take than antacids. Still, these drugs can be helpful in relieving intermittent, infrequent heartburn and indigestion. If these symptoms occur frequently such as multiple times a day or at night, then the cause should be sought, as a more serious disorder may be present. Aluminum hydroxide is a mineral.
Alginic acid reacts with saliva to produce a foamy froth that layers on the liquid in the stomach.
This may prevent reflux of acid into the esophagus. Sodium bicarbonate is baking soda and is an antacid. Taken on an empty stomach, they only neutralize acid for 30 to 60 minutes because the antacid quickly leaves the stomach. If taken with food, the protective effect may be 2 or 3 hours. To get as much acid reduction as prescription medicines produce is expensive as the antacid must be taken frequently during the day and night.