Antacids are alkali drugs or reagents for neutralizing acids, most commonly used with heartburn. The principal antacids in use are magnesia, lime, and their carbonates, and the carbonates of potash and soda. Found on http://www.probertencyclopaedia.com/browse/EA.HTM
Drugs that reduce the level of acidity in the stomach (by neutralising the acid that the stomach naturally produces). They can be used to relieve problems with the digestive system, such as stomach ulcers.
Found on http://www.encyclo.co.uk/local/20560