Maalox is a brand name antacid containing Aluminium hydroxide and Magnesium hydroxide to neutralize or reduce stomach acid. Maalox helps relieve symptoms of excessive stomach acidity in patients with indigestion, heartburn, gastroesophageal reflux disease, or stomach or duodenal ulcers. In large doses, it can act as a laxative. The trademark is owned by Novartis International AG, and was first used commercially in 1949.