Digene Antacid Antigas Gel Mint Flavour, 200 ml belongs to a group of medicines called 'antacids' used to treat acidity, heartburn, indigestion, gastritis (inflammation of the stomach), and stomach upset. The stomach is usually protected from the acid by a mucous layer. In some cases, the mucous layer gets eroded due to excess acid production, which leads to complications like acidity and heartburn.