Gaviscon Advance Mint Chewable Tablets pr relief from the pain and discomfort of heartburn and acid indigestion, which for example, can occur after meals or during pregnancy. They belong to a group of medicines called \'reflux suppressants\', which form a protective layer on top of the stomach contents to prevent stomach acid escaping from the stomach where it works into the food pipe where it hurts. How do Gaviscon Advance Mint Chewable Tablets work?Gaviscon Advance forms a raft over the stomach contents which helps prevent acid coming back up into the oesophagus (food pipe). Please note that results may vary.