Antacids are designed to decrease acidity in the stomach.
Antacid is any substance that is used to counteract or neutralize gastric acids and relieve the discomfort caused by gastric acidity.
Some common antacids include sodium bicarbonate, magnesium hydroxide, calcium carbonate, or aluminum hydroxide.
Of the many liquid antacids available, those consisting of either magnesium or aluminum alkalinizing agents are preferable to antacids containing calcium salts.